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diff --git a/static/viewerjs/dist/viewer.common.js b/static/viewerjs/dist/viewer.common.js
new file mode 100644
index 0000000..321fb2c
--- /dev/null
+++ b/static/viewerjs/dist/viewer.common.js
@@ -0,0 +1,3235 @@
+/*!
+ * Viewer.js v1.11.2
+ * https://fengyuanchen.github.io/viewerjs
+ *
+ * Copyright 2015-present Chen Fengyuan
+ * Released under the MIT license
+ *
+ * Date: 2023-01-01T10:14:49.638Z
+ */
+
+'use strict';
+
+function ownKeys(object, enumerableOnly) {
+  var keys = Object.keys(object);
+  if (Object.getOwnPropertySymbols) {
+    var symbols = Object.getOwnPropertySymbols(object);
+    enumerableOnly && (symbols = symbols.filter(function (sym) {
+      return Object.getOwnPropertyDescriptor(object, sym).enumerable;
+    })), keys.push.apply(keys, symbols);
+  }
+  return keys;
+}
+function _objectSpread2(target) {
+  for (var i = 1; i < arguments.length; i++) {
+    var source = null != arguments[i] ? arguments[i] : {};
+    i % 2 ? ownKeys(Object(source), !0).forEach(function (key) {
+      _defineProperty(target, key, source[key]);
+    }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) {
+      Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
+    });
+  }
+  return target;
+}
+function _typeof(obj) {
+  "@babel/helpers - typeof";
+
+  return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) {
+    return typeof obj;
+  } : function (obj) {
+    return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
+  }, _typeof(obj);
+}
+function _classCallCheck(instance, Constructor) {
+  if (!(instance instanceof Constructor)) {
+    throw new TypeError("Cannot call a class as a function");
+  }
+}
+function _defineProperties(target, props) {
+  for (var i = 0; i < props.length; i++) {
+    var descriptor = props[i];
+    descriptor.enumerable = descriptor.enumerable || false;
+    descriptor.configurable = true;
+    if ("value" in descriptor) descriptor.writable = true;
+    Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor);
+  }
+}
+function _createClass(Constructor, protoProps, staticProps) {
+  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
+  if (staticProps) _defineProperties(Constructor, staticProps);
+  Object.defineProperty(Constructor, "prototype", {
+    writable: false
+  });
+  return Constructor;
+}
+function _defineProperty(obj, key, value) {
+  key = _toPropertyKey(key);
+  if (key in obj) {
+    Object.defineProperty(obj, key, {
+      value: value,
+      enumerable: true,
+      configurable: true,
+      writable: true
+    });
+  } else {
+    obj[key] = value;
+  }
+  return obj;
+}
+function _toPrimitive(input, hint) {
+  if (typeof input !== "object" || input === null) return input;
+  var prim = input[Symbol.toPrimitive];
+  if (prim !== undefined) {
+    var res = prim.call(input, hint || "default");
+    if (typeof res !== "object") return res;
+    throw new TypeError("@@toPrimitive must return a primitive value.");
+  }
+  return (hint === "string" ? String : Number)(input);
+}
+function _toPropertyKey(arg) {
+  var key = _toPrimitive(arg, "string");
+  return typeof key === "symbol" ? key : String(key);
+}
+
+var DEFAULTS = {
+  /**
+   * Enable a modal backdrop, specify `static` for a backdrop
+   * which doesn't close the modal on click.
+   * @type {boolean}
+   */
+  backdrop: true,
+  /**
+   * Show the button on the top-right of the viewer.
+   * @type {boolean}
+   */
+  button: true,
+  /**
+   * Show the navbar.
+   * @type {boolean | number}
+   */
+  navbar: true,
+  /**
+   * Specify the visibility and the content of the title.
+   * @type {boolean | number | Function | Array}
+   */
+  title: true,
+  /**
+   * Show the toolbar.
+   * @type {boolean | number | Object}
+   */
+  toolbar: true,
+  /**
+   * Custom class name(s) to add to the viewer's root element.
+   * @type {string}
+   */
+  className: '',
+  /**
+   * Define where to put the viewer in modal mode.
+   * @type {string | Element}
+   */
+  container: 'body',
+  /**
+   * Filter the images for viewing. Return true if the image is viewable.
+   * @type {Function}
+   */
+  filter: null,
+  /**
+   * Enable to request fullscreen when play.
+   * {@link https://developer.mozilla.org/en-US/docs/Web/API/FullscreenOptions}
+   * @type {boolean|FullscreenOptions}
+   */
+  fullscreen: true,
+  /**
+   * Define the extra attributes to inherit from the original image.
+   * @type {Array}
+   */
+  inheritedAttributes: ['crossOrigin', 'decoding', 'isMap', 'loading', 'referrerPolicy', 'sizes', 'srcset', 'useMap'],
+  /**
+   * Define the initial coverage of the viewing image.
+   * @type {number}
+   */
+  initialCoverage: 0.9,
+  /**
+   * Define the initial index of the image for viewing.
+   * @type {number}
+   */
+  initialViewIndex: 0,
+  /**
+   * Enable inline mode.
+   * @type {boolean}
+   */
+  inline: false,
+  /**
+   * The amount of time to delay between automatically cycling an image when playing.
+   * @type {number}
+   */
+  interval: 5000,
+  /**
+   * Enable keyboard support.
+   * @type {boolean}
+   */
+  keyboard: true,
+  /**
+   * Focus the viewer when initialized.
+   * @type {boolean}
+   */
+  focus: true,
+  /**
+   * Indicate if show a loading spinner when load image or not.
+   * @type {boolean}
+   */
+  loading: true,
+  /**
+   * Indicate if enable loop viewing or not.
+   * @type {boolean}
+   */
+  loop: true,
+  /**
+   * Min width of the viewer in inline mode.
+   * @type {number}
+   */
+  minWidth: 200,
+  /**
+   * Min height of the viewer in inline mode.
+   * @type {number}
+   */
+  minHeight: 100,
+  /**
+   * Enable to move the image.
+   * @type {boolean}
+   */
+  movable: true,
+  /**
+   * Enable to rotate the image.
+   * @type {boolean}
+   */
+  rotatable: true,
+  /**
+   * Enable to scale the image.
+   * @type {boolean}
+   */
+  scalable: true,
+  /**
+   * Enable to zoom the image.
+   * @type {boolean}
+   */
+  zoomable: true,
+  /**
+   * Enable to zoom the current image by dragging on the touch screen.
+   * @type {boolean}
+   */
+  zoomOnTouch: true,
+  /**
+   * Enable to zoom the image by wheeling mouse.
+   * @type {boolean}
+   */
+  zoomOnWheel: true,
+  /**
+   * Enable to slide to the next or previous image by swiping on the touch screen.
+   * @type {boolean}
+   */
+  slideOnTouch: true,
+  /**
+   * Indicate if toggle the image size between its natural size
+   * and initial size when double click on the image or not.
+   * @type {boolean}
+   */
+  toggleOnDblclick: true,
+  /**
+   * Show the tooltip with image ratio (percentage) when zoom in or zoom out.
+   * @type {boolean}
+   */
+  tooltip: true,
+  /**
+   * Enable CSS3 Transition for some special elements.
+   * @type {boolean}
+   */
+  transition: true,
+  /**
+   * Define the CSS `z-index` value of viewer in modal mode.
+   * @type {number}
+   */
+  zIndex: 2015,
+  /**
+   * Define the CSS `z-index` value of viewer in inline mode.
+   * @type {number}
+   */
+  zIndexInline: 0,
+  /**
+   * Define the ratio when zoom the image by wheeling mouse.
+   * @type {number}
+   */
+  zoomRatio: 0.1,
+  /**
+   * Define the min ratio of the image when zoom out.
+   * @type {number}
+   */
+  minZoomRatio: 0.01,
+  /**
+   * Define the max ratio of the image when zoom in.
+   * @type {number}
+   */
+  maxZoomRatio: 100,
+  /**
+   * Define where to get the original image URL for viewing.
+   * @type {string | Function}
+   */
+  url: 'src',
+  /**
+   * Event shortcuts.
+   * @type {Function}
+   */
+  ready: null,
+  show: null,
+  shown: null,
+  hide: null,
+  hidden: null,
+  view: null,
+  viewed: null,
+  move: null,
+  moved: null,
+  rotate: null,
+  rotated: null,
+  scale: null,
+  scaled: null,
+  zoom: null,
+  zoomed: null,
+  play: null,
+  stop: null
+};
+
+var TEMPLATE = '<div class="viewer-container" tabindex="-1" touch-action="none">' + '<div class="viewer-canvas"></div>' + '<div class="viewer-footer">' + '<div class="viewer-title"></div>' + '<div class="viewer-toolbar"></div>' + '<div class="viewer-navbar">' + '<ul class="viewer-list" role="navigation"></ul>' + '</div>' + '</div>' + '<div class="viewer-tooltip" role="alert" aria-hidden="true"></div>' + '<div class="viewer-button" data-viewer-action="mix" role="button"></div>' + '<div class="viewer-player"></div>' + '</div>';
+
+var IS_BROWSER = typeof window !== 'undefined' && typeof window.document !== 'undefined';
+var WINDOW = IS_BROWSER ? window : {};
+var IS_TOUCH_DEVICE = IS_BROWSER && WINDOW.document.documentElement ? 'ontouchstart' in WINDOW.document.documentElement : false;
+var HAS_POINTER_EVENT = IS_BROWSER ? 'PointerEvent' in WINDOW : false;
+var NAMESPACE = 'viewer';
+
+// Actions
+var ACTION_MOVE = 'move';
+var ACTION_SWITCH = 'switch';
+var ACTION_ZOOM = 'zoom';
+
+// Classes
+var CLASS_ACTIVE = "".concat(NAMESPACE, "-active");
+var CLASS_CLOSE = "".concat(NAMESPACE, "-close");
+var CLASS_FADE = "".concat(NAMESPACE, "-fade");
+var CLASS_FIXED = "".concat(NAMESPACE, "-fixed");
+var CLASS_FULLSCREEN = "".concat(NAMESPACE, "-fullscreen");
+var CLASS_FULLSCREEN_EXIT = "".concat(NAMESPACE, "-fullscreen-exit");
+var CLASS_HIDE = "".concat(NAMESPACE, "-hide");
+var CLASS_HIDE_MD_DOWN = "".concat(NAMESPACE, "-hide-md-down");
+var CLASS_HIDE_SM_DOWN = "".concat(NAMESPACE, "-hide-sm-down");
+var CLASS_HIDE_XS_DOWN = "".concat(NAMESPACE, "-hide-xs-down");
+var CLASS_IN = "".concat(NAMESPACE, "-in");
+var CLASS_INVISIBLE = "".concat(NAMESPACE, "-invisible");
+var CLASS_LOADING = "".concat(NAMESPACE, "-loading");
+var CLASS_MOVE = "".concat(NAMESPACE, "-move");
+var CLASS_OPEN = "".concat(NAMESPACE, "-open");
+var CLASS_SHOW = "".concat(NAMESPACE, "-show");
+var CLASS_TRANSITION = "".concat(NAMESPACE, "-transition");
+
+// Native events
+var EVENT_CLICK = 'click';
+var EVENT_DBLCLICK = 'dblclick';
+var EVENT_DRAG_START = 'dragstart';
+var EVENT_FOCUSIN = 'focusin';
+var EVENT_KEY_DOWN = 'keydown';
+var EVENT_LOAD = 'load';
+var EVENT_ERROR = 'error';
+var EVENT_TOUCH_END = IS_TOUCH_DEVICE ? 'touchend touchcancel' : 'mouseup';
+var EVENT_TOUCH_MOVE = IS_TOUCH_DEVICE ? 'touchmove' : 'mousemove';
+var EVENT_TOUCH_START = IS_TOUCH_DEVICE ? 'touchstart' : 'mousedown';
+var EVENT_POINTER_DOWN = HAS_POINTER_EVENT ? 'pointerdown' : EVENT_TOUCH_START;
+var EVENT_POINTER_MOVE = HAS_POINTER_EVENT ? 'pointermove' : EVENT_TOUCH_MOVE;
+var EVENT_POINTER_UP = HAS_POINTER_EVENT ? 'pointerup pointercancel' : EVENT_TOUCH_END;
+var EVENT_RESIZE = 'resize';
+var EVENT_TRANSITION_END = 'transitionend';
+var EVENT_WHEEL = 'wheel';
+
+// Custom events
+var EVENT_READY = 'ready';
+var EVENT_SHOW = 'show';
+var EVENT_SHOWN = 'shown';
+var EVENT_HIDE = 'hide';
+var EVENT_HIDDEN = 'hidden';
+var EVENT_VIEW = 'view';
+var EVENT_VIEWED = 'viewed';
+var EVENT_MOVE = 'move';
+var EVENT_MOVED = 'moved';
+var EVENT_ROTATE = 'rotate';
+var EVENT_ROTATED = 'rotated';
+var EVENT_SCALE = 'scale';
+var EVENT_SCALED = 'scaled';
+var EVENT_ZOOM = 'zoom';
+var EVENT_ZOOMED = 'zoomed';
+var EVENT_PLAY = 'play';
+var EVENT_STOP = 'stop';
+
+// Data keys
+var DATA_ACTION = "".concat(NAMESPACE, "Action");
+
+// RegExps
+var REGEXP_SPACES = /\s\s*/;
+
+// Misc
+var BUTTONS = ['zoom-in', 'zoom-out', 'one-to-one', 'reset', 'prev', 'play', 'next', 'rotate-left', 'rotate-right', 'flip-horizontal', 'flip-vertical'];
+
+/**
+ * Check if the given value is a string.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a string, else `false`.
+ */
+function isString(value) {
+  return typeof value === 'string';
+}
+
+/**
+ * Check if the given value is not a number.
+ */
+var isNaN = Number.isNaN || WINDOW.isNaN;
+
+/**
+ * Check if the given value is a number.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a number, else `false`.
+ */
+function isNumber(value) {
+  return typeof value === 'number' && !isNaN(value);
+}
+
+/**
+ * Check if the given value is undefined.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is undefined, else `false`.
+ */
+function isUndefined(value) {
+  return typeof value === 'undefined';
+}
+
+/**
+ * Check if the given value is an object.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is an object, else `false`.
+ */
+function isObject(value) {
+  return _typeof(value) === 'object' && value !== null;
+}
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+
+/**
+ * Check if the given value is a plain object.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a plain object, else `false`.
+ */
+function isPlainObject(value) {
+  if (!isObject(value)) {
+    return false;
+  }
+  try {
+    var _constructor = value.constructor;
+    var prototype = _constructor.prototype;
+    return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
+  } catch (error) {
+    return false;
+  }
+}
+
+/**
+ * Check if the given value is a function.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a function, else `false`.
+ */
+function isFunction(value) {
+  return typeof value === 'function';
+}
+
+/**
+ * Iterate the given data.
+ * @param {*} data - The data to iterate.
+ * @param {Function} callback - The process function for each element.
+ * @returns {*} The original data.
+ */
+function forEach(data, callback) {
+  if (data && isFunction(callback)) {
+    if (Array.isArray(data) || isNumber(data.length) /* array-like */) {
+      var length = data.length;
+      var i;
+      for (i = 0; i < length; i += 1) {
+        if (callback.call(data, data[i], i, data) === false) {
+          break;
+        }
+      }
+    } else if (isObject(data)) {
+      Object.keys(data).forEach(function (key) {
+        callback.call(data, data[key], key, data);
+      });
+    }
+  }
+  return data;
+}
+
+/**
+ * Extend the given object.
+ * @param {*} obj - The object to be extended.
+ * @param {*} args - The rest objects which will be merged to the first object.
+ * @returns {Object} The extended object.
+ */
+var assign = Object.assign || function assign(obj) {
+  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    args[_key - 1] = arguments[_key];
+  }
+  if (isObject(obj) && args.length > 0) {
+    args.forEach(function (arg) {
+      if (isObject(arg)) {
+        Object.keys(arg).forEach(function (key) {
+          obj[key] = arg[key];
+        });
+      }
+    });
+  }
+  return obj;
+};
+var REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/;
+
+/**
+ * Apply styles to the given element.
+ * @param {Element} element - The target element.
+ * @param {Object} styles - The styles for applying.
+ */
+function setStyle(element, styles) {
+  var style = element.style;
+  forEach(styles, function (value, property) {
+    if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
+      value += 'px';
+    }
+    style[property] = value;
+  });
+}
+
+/**
+ * Escape a string for using in HTML.
+ * @param {String} value - The string to escape.
+ * @returns {String} Returns the escaped string.
+ */
+function escapeHTMLEntities(value) {
+  return isString(value) ? value.replace(/&(?!amp;|quot;|#39;|lt;|gt;)/g, '&amp;').replace(/"/g, '&quot;').replace(/'/g, '&#39;').replace(/</g, '&lt;').replace(/>/g, '&gt;') : value;
+}
+
+/**
+ * Check if the given element has a special class.
+ * @param {Element} element - The element to check.
+ * @param {string} value - The class to search.
+ * @returns {boolean} Returns `true` if the special class was found.
+ */
+function hasClass(element, value) {
+  if (!element || !value) {
+    return false;
+  }
+  return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1;
+}
+
+/**
+ * Add classes to the given element.
+ * @param {Element} element - The target element.
+ * @param {string} value - The classes to be added.
+ */
+function addClass(element, value) {
+  if (!element || !value) {
+    return;
+  }
+  if (isNumber(element.length)) {
+    forEach(element, function (elem) {
+      addClass(elem, value);
+    });
+    return;
+  }
+  if (element.classList) {
+    element.classList.add(value);
+    return;
+  }
+  var className = element.className.trim();
+  if (!className) {
+    element.className = value;
+  } else if (className.indexOf(value) < 0) {
+    element.className = "".concat(className, " ").concat(value);
+  }
+}
+
+/**
+ * Remove classes from the given element.
+ * @param {Element} element - The target element.
+ * @param {string} value - The classes to be removed.
+ */
+function removeClass(element, value) {
+  if (!element || !value) {
+    return;
+  }
+  if (isNumber(element.length)) {
+    forEach(element, function (elem) {
+      removeClass(elem, value);
+    });
+    return;
+  }
+  if (element.classList) {
+    element.classList.remove(value);
+    return;
+  }
+  if (element.className.indexOf(value) >= 0) {
+    element.className = element.className.replace(value, '');
+  }
+}
+
+/**
+ * Add or remove classes from the given element.
+ * @param {Element} element - The target element.
+ * @param {string} value - The classes to be toggled.
+ * @param {boolean} added - Add only.
+ */
+function toggleClass(element, value, added) {
+  if (!value) {
+    return;
+  }
+  if (isNumber(element.length)) {
+    forEach(element, function (elem) {
+      toggleClass(elem, value, added);
+    });
+    return;
+  }
+
+  // IE10-11 doesn't support the second parameter of `classList.toggle`
+  if (added) {
+    addClass(element, value);
+  } else {
+    removeClass(element, value);
+  }
+}
+var REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;
+
+/**
+ * Transform the given string from camelCase to kebab-case
+ * @param {string} value - The value to transform.
+ * @returns {string} The transformed value.
+ */
+function hyphenate(value) {
+  return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
+}
+
+/**
+ * Get data from the given element.
+ * @param {Element} element - The target element.
+ * @param {string} name - The data key to get.
+ * @returns {string} The data value.
+ */
+function getData(element, name) {
+  if (isObject(element[name])) {
+    return element[name];
+  }
+  if (element.dataset) {
+    return element.dataset[name];
+  }
+  return element.getAttribute("data-".concat(hyphenate(name)));
+}
+
+/**
+ * Set data to the given element.
+ * @param {Element} element - The target element.
+ * @param {string} name - The data key to set.
+ * @param {string} data - The data value.
+ */
+function setData(element, name, data) {
+  if (isObject(data)) {
+    element[name] = data;
+  } else if (element.dataset) {
+    element.dataset[name] = data;
+  } else {
+    element.setAttribute("data-".concat(hyphenate(name)), data);
+  }
+}
+var onceSupported = function () {
+  var supported = false;
+  if (IS_BROWSER) {
+    var once = false;
+    var listener = function listener() {};
+    var options = Object.defineProperty({}, 'once', {
+      get: function get() {
+        supported = true;
+        return once;
+      },
+      /**
+       * This setter can fix a `TypeError` in strict mode
+       * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only}
+       * @param {boolean} value - The value to set
+       */
+      set: function set(value) {
+        once = value;
+      }
+    });
+    WINDOW.addEventListener('test', listener, options);
+    WINDOW.removeEventListener('test', listener, options);
+  }
+  return supported;
+}();
+
+/**
+ * Remove event listener from the target element.
+ * @param {Element} element - The event target.
+ * @param {string} type - The event type(s).
+ * @param {Function} listener - The event listener.
+ * @param {Object} options - The event options.
+ */
+function removeListener(element, type, listener) {
+  var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
+  var handler = listener;
+  type.trim().split(REGEXP_SPACES).forEach(function (event) {
+    if (!onceSupported) {
+      var listeners = element.listeners;
+      if (listeners && listeners[event] && listeners[event][listener]) {
+        handler = listeners[event][listener];
+        delete listeners[event][listener];
+        if (Object.keys(listeners[event]).length === 0) {
+          delete listeners[event];
+        }
+        if (Object.keys(listeners).length === 0) {
+          delete element.listeners;
+        }
+      }
+    }
+    element.removeEventListener(event, handler, options);
+  });
+}
+
+/**
+ * Add event listener to the target element.
+ * @param {Element} element - The event target.
+ * @param {string} type - The event type(s).
+ * @param {Function} listener - The event listener.
+ * @param {Object} options - The event options.
+ */
+function addListener(element, type, listener) {
+  var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
+  var _handler = listener;
+  type.trim().split(REGEXP_SPACES).forEach(function (event) {
+    if (options.once && !onceSupported) {
+      var _element$listeners = element.listeners,
+        listeners = _element$listeners === void 0 ? {} : _element$listeners;
+      _handler = function handler() {
+        delete listeners[event][listener];
+        element.removeEventListener(event, _handler, options);
+        for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+          args[_key2] = arguments[_key2];
+        }
+        listener.apply(element, args);
+      };
+      if (!listeners[event]) {
+        listeners[event] = {};
+      }
+      if (listeners[event][listener]) {
+        element.removeEventListener(event, listeners[event][listener], options);
+      }
+      listeners[event][listener] = _handler;
+      element.listeners = listeners;
+    }
+    element.addEventListener(event, _handler, options);
+  });
+}
+
+/**
+ * Dispatch event on the target element.
+ * @param {Element} element - The event target.
+ * @param {string} type - The event type(s).
+ * @param {Object} data - The additional event data.
+ * @param {Object} options - The additional event options.
+ * @returns {boolean} Indicate if the event is default prevented or not.
+ */
+function dispatchEvent(element, type, data, options) {
+  var event;
+
+  // Event and CustomEvent on IE9-11 are global objects, not constructors
+  if (isFunction(Event) && isFunction(CustomEvent)) {
+    event = new CustomEvent(type, _objectSpread2({
+      bubbles: true,
+      cancelable: true,
+      detail: data
+    }, options));
+  } else {
+    event = document.createEvent('CustomEvent');
+    event.initCustomEvent(type, true, true, data);
+  }
+  return element.dispatchEvent(event);
+}
+
+/**
+ * Get the offset base on the document.
+ * @param {Element} element - The target element.
+ * @returns {Object} The offset data.
+ */
+function getOffset(element) {
+  var box = element.getBoundingClientRect();
+  return {
+    left: box.left + (window.pageXOffset - document.documentElement.clientLeft),
+    top: box.top + (window.pageYOffset - document.documentElement.clientTop)
+  };
+}
+
+/**
+ * Get transforms base on the given object.
+ * @param {Object} obj - The target object.
+ * @returns {string} A string contains transform values.
+ */
+function getTransforms(_ref) {
+  var rotate = _ref.rotate,
+    scaleX = _ref.scaleX,
+    scaleY = _ref.scaleY,
+    translateX = _ref.translateX,
+    translateY = _ref.translateY;
+  var values = [];
+  if (isNumber(translateX) && translateX !== 0) {
+    values.push("translateX(".concat(translateX, "px)"));
+  }
+  if (isNumber(translateY) && translateY !== 0) {
+    values.push("translateY(".concat(translateY, "px)"));
+  }
+
+  // Rotate should come first before scale to match orientation transform
+  if (isNumber(rotate) && rotate !== 0) {
+    values.push("rotate(".concat(rotate, "deg)"));
+  }
+  if (isNumber(scaleX) && scaleX !== 1) {
+    values.push("scaleX(".concat(scaleX, ")"));
+  }
+  if (isNumber(scaleY) && scaleY !== 1) {
+    values.push("scaleY(".concat(scaleY, ")"));
+  }
+  var transform = values.length ? values.join(' ') : 'none';
+  return {
+    WebkitTransform: transform,
+    msTransform: transform,
+    transform: transform
+  };
+}
+
+/**
+ * Get an image name from an image url.
+ * @param {string} url - The target url.
+ * @example
+ * // picture.jpg
+ * getImageNameFromURL('https://domain.com/path/to/picture.jpg?size=1280×960')
+ * @returns {string} A string contains the image name.
+ */
+function getImageNameFromURL(url) {
+  return isString(url) ? decodeURIComponent(url.replace(/^.*\//, '').replace(/[?&#].*$/, '')) : '';
+}
+var IS_SAFARI = WINDOW.navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(WINDOW.navigator.userAgent);
+
+/**
+ * Get an image's natural sizes.
+ * @param {string} image - The target image.
+ * @param {Object} options - The viewer options.
+ * @param {Function} callback - The callback function.
+ * @returns {HTMLImageElement} The new image.
+ */
+function getImageNaturalSizes(image, options, callback) {
+  var newImage = document.createElement('img');
+
+  // Modern browsers (except Safari)
+  if (image.naturalWidth && !IS_SAFARI) {
+    callback(image.naturalWidth, image.naturalHeight);
+    return newImage;
+  }
+  var body = document.body || document.documentElement;
+  newImage.onload = function () {
+    callback(newImage.width, newImage.height);
+    if (!IS_SAFARI) {
+      body.removeChild(newImage);
+    }
+  };
+  forEach(options.inheritedAttributes, function (name) {
+    var value = image.getAttribute(name);
+    if (value !== null) {
+      newImage.setAttribute(name, value);
+    }
+  });
+  newImage.src = image.src;
+
+  // iOS Safari will convert the image automatically
+  // with its orientation once append it into DOM
+  if (!IS_SAFARI) {
+    newImage.style.cssText = 'left:0;' + 'max-height:none!important;' + 'max-width:none!important;' + 'min-height:0!important;' + 'min-width:0!important;' + 'opacity:0;' + 'position:absolute;' + 'top:0;' + 'z-index:-1;';
+    body.appendChild(newImage);
+  }
+  return newImage;
+}
+
+/**
+ * Get the related class name of a responsive type number.
+ * @param {string} type - The responsive type.
+ * @returns {string} The related class name.
+ */
+function getResponsiveClass(type) {
+  switch (type) {
+    case 2:
+      return CLASS_HIDE_XS_DOWN;
+    case 3:
+      return CLASS_HIDE_SM_DOWN;
+    case 4:
+      return CLASS_HIDE_MD_DOWN;
+    default:
+      return '';
+  }
+}
+
+/**
+ * Get the max ratio of a group of pointers.
+ * @param {string} pointers - The target pointers.
+ * @returns {number} The result ratio.
+ */
+function getMaxZoomRatio(pointers) {
+  var pointers2 = _objectSpread2({}, pointers);
+  var ratios = [];
+  forEach(pointers, function (pointer, pointerId) {
+    delete pointers2[pointerId];
+    forEach(pointers2, function (pointer2) {
+      var x1 = Math.abs(pointer.startX - pointer2.startX);
+      var y1 = Math.abs(pointer.startY - pointer2.startY);
+      var x2 = Math.abs(pointer.endX - pointer2.endX);
+      var y2 = Math.abs(pointer.endY - pointer2.endY);
+      var z1 = Math.sqrt(x1 * x1 + y1 * y1);
+      var z2 = Math.sqrt(x2 * x2 + y2 * y2);
+      var ratio = (z2 - z1) / z1;
+      ratios.push(ratio);
+    });
+  });
+  ratios.sort(function (a, b) {
+    return Math.abs(a) < Math.abs(b);
+  });
+  return ratios[0];
+}
+
+/**
+ * Get a pointer from an event object.
+ * @param {Object} event - The target event object.
+ * @param {boolean} endOnly - Indicates if only returns the end point coordinate or not.
+ * @returns {Object} The result pointer contains start and/or end point coordinates.
+ */
+function getPointer(_ref2, endOnly) {
+  var pageX = _ref2.pageX,
+    pageY = _ref2.pageY;
+  var end = {
+    endX: pageX,
+    endY: pageY
+  };
+  return endOnly ? end : _objectSpread2({
+    timeStamp: Date.now(),
+    startX: pageX,
+    startY: pageY
+  }, end);
+}
+
+/**
+ * Get the center point coordinate of a group of pointers.
+ * @param {Object} pointers - The target pointers.
+ * @returns {Object} The center point coordinate.
+ */
+function getPointersCenter(pointers) {
+  var pageX = 0;
+  var pageY = 0;
+  var count = 0;
+  forEach(pointers, function (_ref3) {
+    var startX = _ref3.startX,
+      startY = _ref3.startY;
+    pageX += startX;
+    pageY += startY;
+    count += 1;
+  });
+  pageX /= count;
+  pageY /= count;
+  return {
+    pageX: pageX,
+    pageY: pageY
+  };
+}
+
+var render = {
+  render: function render() {
+    this.initContainer();
+    this.initViewer();
+    this.initList();
+    this.renderViewer();
+  },
+  initBody: function initBody() {
+    var ownerDocument = this.element.ownerDocument;
+    var body = ownerDocument.body || ownerDocument.documentElement;
+    this.body = body;
+    this.scrollbarWidth = window.innerWidth - ownerDocument.documentElement.clientWidth;
+    this.initialBodyPaddingRight = body.style.paddingRight;
+    this.initialBodyComputedPaddingRight = window.getComputedStyle(body).paddingRight;
+  },
+  initContainer: function initContainer() {
+    this.containerData = {
+      width: window.innerWidth,
+      height: window.innerHeight
+    };
+  },
+  initViewer: function initViewer() {
+    var options = this.options,
+      parent = this.parent;
+    var viewerData;
+    if (options.inline) {
+      viewerData = {
+        width: Math.max(parent.offsetWidth, options.minWidth),
+        height: Math.max(parent.offsetHeight, options.minHeight)
+      };
+      this.parentData = viewerData;
+    }
+    if (this.fulled || !viewerData) {
+      viewerData = this.containerData;
+    }
+    this.viewerData = assign({}, viewerData);
+  },
+  renderViewer: function renderViewer() {
+    if (this.options.inline && !this.fulled) {
+      setStyle(this.viewer, this.viewerData);
+    }
+  },
+  initList: function initList() {
+    var _this = this;
+    var element = this.element,
+      options = this.options,
+      list = this.list;
+    var items = [];
+
+    // initList may be called in this.update, so should keep idempotent
+    list.innerHTML = '';
+    forEach(this.images, function (image, index) {
+      var src = image.src;
+      var alt = image.alt || getImageNameFromURL(src);
+      var url = _this.getImageURL(image);
+      if (src || url) {
+        var item = document.createElement('li');
+        var img = document.createElement('img');
+        forEach(options.inheritedAttributes, function (name) {
+          var value = image.getAttribute(name);
+          if (value !== null) {
+            img.setAttribute(name, value);
+          }
+        });
+        if (options.navbar) {
+          img.src = src || url;
+        }
+        img.alt = alt;
+        img.setAttribute('data-original-url', url || src);
+        item.setAttribute('data-index', index);
+        item.setAttribute('data-viewer-action', 'view');
+        item.setAttribute('role', 'button');
+        if (options.keyboard) {
+          item.setAttribute('tabindex', 0);
+        }
+        item.appendChild(img);
+        list.appendChild(item);
+        items.push(item);
+      }
+    });
+    this.items = items;
+    forEach(items, function (item) {
+      var image = item.firstElementChild;
+      var onLoad;
+      var onError;
+      setData(image, 'filled', true);
+      if (options.loading) {
+        addClass(item, CLASS_LOADING);
+      }
+      addListener(image, EVENT_LOAD, onLoad = function onLoad(event) {
+        removeListener(image, EVENT_ERROR, onError);
+        if (options.loading) {
+          removeClass(item, CLASS_LOADING);
+        }
+        _this.loadImage(event);
+      }, {
+        once: true
+      });
+      addListener(image, EVENT_ERROR, onError = function onError() {
+        removeListener(image, EVENT_LOAD, onLoad);
+        if (options.loading) {
+          removeClass(item, CLASS_LOADING);
+        }
+      }, {
+        once: true
+      });
+    });
+    if (options.transition) {
+      addListener(element, EVENT_VIEWED, function () {
+        addClass(list, CLASS_TRANSITION);
+      }, {
+        once: true
+      });
+    }
+  },
+  renderList: function renderList() {
+    var index = this.index;
+    var item = this.items[index];
+    if (!item) {
+      return;
+    }
+    var next = item.nextElementSibling;
+    var gutter = parseInt(window.getComputedStyle(next || item).marginLeft, 10);
+    var offsetWidth = item.offsetWidth;
+    var outerWidth = offsetWidth + gutter;
+
+    // Place the active item in the center of the screen
+    setStyle(this.list, assign({
+      width: outerWidth * this.length - gutter
+    }, getTransforms({
+      translateX: (this.viewerData.width - offsetWidth) / 2 - outerWidth * index
+    })));
+  },
+  resetList: function resetList() {
+    var list = this.list;
+    list.innerHTML = '';
+    removeClass(list, CLASS_TRANSITION);
+    setStyle(list, getTransforms({
+      translateX: 0
+    }));
+  },
+  initImage: function initImage(done) {
+    var _this2 = this;
+    var options = this.options,
+      image = this.image,
+      viewerData = this.viewerData;
+    var footerHeight = this.footer.offsetHeight;
+    var viewerWidth = viewerData.width;
+    var viewerHeight = Math.max(viewerData.height - footerHeight, footerHeight);
+    var oldImageData = this.imageData || {};
+    var sizingImage;
+    this.imageInitializing = {
+      abort: function abort() {
+        sizingImage.onload = null;
+      }
+    };
+    sizingImage = getImageNaturalSizes(image, options, function (naturalWidth, naturalHeight) {
+      var aspectRatio = naturalWidth / naturalHeight;
+      var initialCoverage = Math.max(0, Math.min(1, options.initialCoverage));
+      var width = viewerWidth;
+      var height = viewerHeight;
+      _this2.imageInitializing = false;
+      if (viewerHeight * aspectRatio > viewerWidth) {
+        height = viewerWidth / aspectRatio;
+      } else {
+        width = viewerHeight * aspectRatio;
+      }
+      initialCoverage = isNumber(initialCoverage) ? initialCoverage : 0.9;
+      width = Math.min(width * initialCoverage, naturalWidth);
+      height = Math.min(height * initialCoverage, naturalHeight);
+      var left = (viewerWidth - width) / 2;
+      var top = (viewerHeight - height) / 2;
+      var imageData = {
+        left: left,
+        top: top,
+        x: left,
+        y: top,
+        width: width,
+        height: height,
+        oldRatio: 1,
+        ratio: width / naturalWidth,
+        aspectRatio: aspectRatio,
+        naturalWidth: naturalWidth,
+        naturalHeight: naturalHeight
+      };
+      var initialImageData = assign({}, imageData);
+      if (options.rotatable) {
+        imageData.rotate = oldImageData.rotate || 0;
+        initialImageData.rotate = 0;
+      }
+      if (options.scalable) {
+        imageData.scaleX = oldImageData.scaleX || 1;
+        imageData.scaleY = oldImageData.scaleY || 1;
+        initialImageData.scaleX = 1;
+        initialImageData.scaleY = 1;
+      }
+      _this2.imageData = imageData;
+      _this2.initialImageData = initialImageData;
+      if (done) {
+        done();
+      }
+    });
+  },
+  renderImage: function renderImage(done) {
+    var _this3 = this;
+    var image = this.image,
+      imageData = this.imageData;
+    setStyle(image, assign({
+      width: imageData.width,
+      height: imageData.height,
+      // XXX: Not to use translateX/Y to avoid image shaking when zooming
+      marginLeft: imageData.x,
+      marginTop: imageData.y
+    }, getTransforms(imageData)));
+    if (done) {
+      if ((this.viewing || this.moving || this.rotating || this.scaling || this.zooming) && this.options.transition && hasClass(image, CLASS_TRANSITION)) {
+        var onTransitionEnd = function onTransitionEnd() {
+          _this3.imageRendering = false;
+          done();
+        };
+        this.imageRendering = {
+          abort: function abort() {
+            removeListener(image, EVENT_TRANSITION_END, onTransitionEnd);
+          }
+        };
+        addListener(image, EVENT_TRANSITION_END, onTransitionEnd, {
+          once: true
+        });
+      } else {
+        done();
+      }
+    }
+  },
+  resetImage: function resetImage() {
+    // this.image only defined after viewed
+    if (this.viewing || this.viewed) {
+      var image = this.image;
+      if (this.viewing) {
+        this.viewing.abort();
+      }
+      image.parentNode.removeChild(image);
+      this.image = null;
+    }
+  }
+};
+
+var events = {
+  bind: function bind() {
+    var options = this.options,
+      viewer = this.viewer,
+      canvas = this.canvas;
+    var document = this.element.ownerDocument;
+    addListener(viewer, EVENT_CLICK, this.onClick = this.click.bind(this));
+    addListener(viewer, EVENT_DRAG_START, this.onDragStart = this.dragstart.bind(this));
+    addListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown = this.pointerdown.bind(this));
+    addListener(document, EVENT_POINTER_MOVE, this.onPointerMove = this.pointermove.bind(this));
+    addListener(document, EVENT_POINTER_UP, this.onPointerUp = this.pointerup.bind(this));
+    addListener(document, EVENT_KEY_DOWN, this.onKeyDown = this.keydown.bind(this));
+    addListener(window, EVENT_RESIZE, this.onResize = this.resize.bind(this));
+    if (options.zoomable && options.zoomOnWheel) {
+      addListener(viewer, EVENT_WHEEL, this.onWheel = this.wheel.bind(this), {
+        passive: false,
+        capture: true
+      });
+    }
+    if (options.toggleOnDblclick) {
+      addListener(canvas, EVENT_DBLCLICK, this.onDblclick = this.dblclick.bind(this));
+    }
+  },
+  unbind: function unbind() {
+    var options = this.options,
+      viewer = this.viewer,
+      canvas = this.canvas;
+    var document = this.element.ownerDocument;
+    removeListener(viewer, EVENT_CLICK, this.onClick);
+    removeListener(viewer, EVENT_DRAG_START, this.onDragStart);
+    removeListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown);
+    removeListener(document, EVENT_POINTER_MOVE, this.onPointerMove);
+    removeListener(document, EVENT_POINTER_UP, this.onPointerUp);
+    removeListener(document, EVENT_KEY_DOWN, this.onKeyDown);
+    removeListener(window, EVENT_RESIZE, this.onResize);
+    if (options.zoomable && options.zoomOnWheel) {
+      removeListener(viewer, EVENT_WHEEL, this.onWheel, {
+        passive: false,
+        capture: true
+      });
+    }
+    if (options.toggleOnDblclick) {
+      removeListener(canvas, EVENT_DBLCLICK, this.onDblclick);
+    }
+  }
+};
+
+var handlers = {
+  click: function click(event) {
+    var options = this.options,
+      imageData = this.imageData;
+    var target = event.target;
+    var action = getData(target, DATA_ACTION);
+    if (!action && target.localName === 'img' && target.parentElement.localName === 'li') {
+      target = target.parentElement;
+      action = getData(target, DATA_ACTION);
+    }
+
+    // Cancel the emulated click when the native click event was triggered.
+    if (IS_TOUCH_DEVICE && event.isTrusted && target === this.canvas) {
+      clearTimeout(this.clickCanvasTimeout);
+    }
+    switch (action) {
+      case 'mix':
+        if (this.played) {
+          this.stop();
+        } else if (options.inline) {
+          if (this.fulled) {
+            this.exit();
+          } else {
+            this.full();
+          }
+        } else {
+          this.hide();
+        }
+        break;
+      case 'hide':
+        if (!this.pointerMoved) {
+          this.hide();
+        }
+        break;
+      case 'view':
+        this.view(getData(target, 'index'));
+        break;
+      case 'zoom-in':
+        this.zoom(0.1, true);
+        break;
+      case 'zoom-out':
+        this.zoom(-0.1, true);
+        break;
+      case 'one-to-one':
+        this.toggle();
+        break;
+      case 'reset':
+        this.reset();
+        break;
+      case 'prev':
+        this.prev(options.loop);
+        break;
+      case 'play':
+        this.play(options.fullscreen);
+        break;
+      case 'next':
+        this.next(options.loop);
+        break;
+      case 'rotate-left':
+        this.rotate(-90);
+        break;
+      case 'rotate-right':
+        this.rotate(90);
+        break;
+      case 'flip-horizontal':
+        this.scaleX(-imageData.scaleX || -1);
+        break;
+      case 'flip-vertical':
+        this.scaleY(-imageData.scaleY || -1);
+        break;
+      default:
+        if (this.played) {
+          this.stop();
+        }
+    }
+  },
+  dblclick: function dblclick(event) {
+    event.preventDefault();
+    if (this.viewed && event.target === this.image) {
+      // Cancel the emulated double click when the native dblclick event was triggered.
+      if (IS_TOUCH_DEVICE && event.isTrusted) {
+        clearTimeout(this.doubleClickImageTimeout);
+      }
+
+      // XXX: No pageX/Y properties in custom event, fallback to the original event.
+      this.toggle(event.isTrusted ? event : event.detail && event.detail.originalEvent);
+    }
+  },
+  load: function load() {
+    var _this = this;
+    if (this.timeout) {
+      clearTimeout(this.timeout);
+      this.timeout = false;
+    }
+    var element = this.element,
+      options = this.options,
+      image = this.image,
+      index = this.index,
+      viewerData = this.viewerData;
+    removeClass(image, CLASS_INVISIBLE);
+    if (options.loading) {
+      removeClass(this.canvas, CLASS_LOADING);
+    }
+    image.style.cssText = 'height:0;' + "margin-left:".concat(viewerData.width / 2, "px;") + "margin-top:".concat(viewerData.height / 2, "px;") + 'max-width:none!important;' + 'position:relative;' + 'width:0;';
+    this.initImage(function () {
+      toggleClass(image, CLASS_MOVE, options.movable);
+      toggleClass(image, CLASS_TRANSITION, options.transition);
+      _this.renderImage(function () {
+        _this.viewed = true;
+        _this.viewing = false;
+        if (isFunction(options.viewed)) {
+          addListener(element, EVENT_VIEWED, options.viewed, {
+            once: true
+          });
+        }
+        dispatchEvent(element, EVENT_VIEWED, {
+          originalImage: _this.images[index],
+          index: index,
+          image: image
+        }, {
+          cancelable: false
+        });
+      });
+    });
+  },
+  loadImage: function loadImage(event) {
+    var image = event.target;
+    var parent = image.parentNode;
+    var parentWidth = parent.offsetWidth || 30;
+    var parentHeight = parent.offsetHeight || 50;
+    var filled = !!getData(image, 'filled');
+    getImageNaturalSizes(image, this.options, function (naturalWidth, naturalHeight) {
+      var aspectRatio = naturalWidth / naturalHeight;
+      var width = parentWidth;
+      var height = parentHeight;
+      if (parentHeight * aspectRatio > parentWidth) {
+        if (filled) {
+          width = parentHeight * aspectRatio;
+        } else {
+          height = parentWidth / aspectRatio;
+        }
+      } else if (filled) {
+        height = parentWidth / aspectRatio;
+      } else {
+        width = parentHeight * aspectRatio;
+      }
+      setStyle(image, assign({
+        width: width,
+        height: height
+      }, getTransforms({
+        translateX: (parentWidth - width) / 2,
+        translateY: (parentHeight - height) / 2
+      })));
+    });
+  },
+  keydown: function keydown(event) {
+    var options = this.options;
+    if (!options.keyboard) {
+      return;
+    }
+    var keyCode = event.keyCode || event.which || event.charCode;
+    switch (keyCode) {
+      // Enter
+      case 13:
+        if (this.viewer.contains(event.target)) {
+          this.click(event);
+        }
+        break;
+    }
+    if (!this.fulled) {
+      return;
+    }
+    switch (keyCode) {
+      // Escape
+      case 27:
+        if (this.played) {
+          this.stop();
+        } else if (options.inline) {
+          if (this.fulled) {
+            this.exit();
+          }
+        } else {
+          this.hide();
+        }
+        break;
+
+      // Space
+      case 32:
+        if (this.played) {
+          this.stop();
+        }
+        break;
+
+      // ArrowLeft
+      case 37:
+        if (this.played && this.playing) {
+          this.playing.prev();
+        } else {
+          this.prev(options.loop);
+        }
+        break;
+
+      // ArrowUp
+      case 38:
+        // Prevent scroll on Firefox
+        event.preventDefault();
+
+        // Zoom in
+        this.zoom(options.zoomRatio, true);
+        break;
+
+      // ArrowRight
+      case 39:
+        if (this.played && this.playing) {
+          this.playing.next();
+        } else {
+          this.next(options.loop);
+        }
+        break;
+
+      // ArrowDown
+      case 40:
+        // Prevent scroll on Firefox
+        event.preventDefault();
+
+        // Zoom out
+        this.zoom(-options.zoomRatio, true);
+        break;
+
+      // Ctrl + 0
+      case 48:
+      // Fall through
+
+      // Ctrl + 1
+      // eslint-disable-next-line no-fallthrough
+      case 49:
+        if (event.ctrlKey) {
+          event.preventDefault();
+          this.toggle();
+        }
+        break;
+    }
+  },
+  dragstart: function dragstart(event) {
+    if (event.target.localName === 'img') {
+      event.preventDefault();
+    }
+  },
+  pointerdown: function pointerdown(event) {
+    var options = this.options,
+      pointers = this.pointers;
+    var buttons = event.buttons,
+      button = event.button;
+    this.pointerMoved = false;
+    if (!this.viewed || this.showing || this.viewing || this.hiding
+
+    // Handle mouse event and pointer event and ignore touch event
+    || (event.type === 'mousedown' || event.type === 'pointerdown' && event.pointerType === 'mouse') && (
+    // No primary button (Usually the left button)
+    isNumber(buttons) && buttons !== 1 || isNumber(button) && button !== 0
+
+    // Open context menu
+    || event.ctrlKey)) {
+      return;
+    }
+
+    // Prevent default behaviours as page zooming in touch devices.
+    event.preventDefault();
+    if (event.changedTouches) {
+      forEach(event.changedTouches, function (touch) {
+        pointers[touch.identifier] = getPointer(touch);
+      });
+    } else {
+      pointers[event.pointerId || 0] = getPointer(event);
+    }
+    var action = options.movable ? ACTION_MOVE : false;
+    if (options.zoomOnTouch && options.zoomable && Object.keys(pointers).length > 1) {
+      action = ACTION_ZOOM;
+    } else if (options.slideOnTouch && (event.pointerType === 'touch' || event.type === 'touchstart') && this.isSwitchable()) {
+      action = ACTION_SWITCH;
+    }
+    if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
+      removeClass(this.image, CLASS_TRANSITION);
+    }
+    this.action = action;
+  },
+  pointermove: function pointermove(event) {
+    var pointers = this.pointers,
+      action = this.action;
+    if (!this.viewed || !action) {
+      return;
+    }
+    event.preventDefault();
+    this.pointerMoved = true;
+    if (event.changedTouches) {
+      forEach(event.changedTouches, function (touch) {
+        assign(pointers[touch.identifier] || {}, getPointer(touch, true));
+      });
+    } else {
+      assign(pointers[event.pointerId || 0] || {}, getPointer(event, true));
+    }
+    this.change(event);
+  },
+  pointerup: function pointerup(event) {
+    var _this2 = this;
+    var options = this.options,
+      action = this.action,
+      pointers = this.pointers;
+    var pointer;
+    if (event.changedTouches) {
+      forEach(event.changedTouches, function (touch) {
+        pointer = pointers[touch.identifier];
+        delete pointers[touch.identifier];
+      });
+    } else {
+      pointer = pointers[event.pointerId || 0];
+      delete pointers[event.pointerId || 0];
+    }
+    if (!action) {
+      return;
+    }
+    event.preventDefault();
+    if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
+      addClass(this.image, CLASS_TRANSITION);
+    }
+    this.action = false;
+
+    // Emulate click and double click in touch devices to support backdrop and image zooming (#210).
+    if (IS_TOUCH_DEVICE && action !== ACTION_ZOOM && pointer && Date.now() - pointer.timeStamp < 500) {
+      clearTimeout(this.clickCanvasTimeout);
+      clearTimeout(this.doubleClickImageTimeout);
+      if (options.toggleOnDblclick && this.viewed && event.target === this.image) {
+        if (this.imageClicked) {
+          this.imageClicked = false;
+
+          // This timeout will be cleared later when a native dblclick event is triggering
+          this.doubleClickImageTimeout = setTimeout(function () {
+            dispatchEvent(_this2.image, EVENT_DBLCLICK, {
+              originalEvent: event
+            });
+          }, 50);
+        } else {
+          this.imageClicked = true;
+
+          // The default timing of a double click in Windows is 500 ms
+          this.doubleClickImageTimeout = setTimeout(function () {
+            _this2.imageClicked = false;
+          }, 500);
+        }
+      } else {
+        this.imageClicked = false;
+        if (options.backdrop && options.backdrop !== 'static' && event.target === this.canvas) {
+          // This timeout will be cleared later when a native click event is triggering
+          this.clickCanvasTimeout = setTimeout(function () {
+            dispatchEvent(_this2.canvas, EVENT_CLICK, {
+              originalEvent: event
+            });
+          }, 50);
+        }
+      }
+    }
+  },
+  resize: function resize() {
+    var _this3 = this;
+    if (!this.isShown || this.hiding) {
+      return;
+    }
+    if (this.fulled) {
+      this.close();
+      this.initBody();
+      this.open();
+    }
+    this.initContainer();
+    this.initViewer();
+    this.renderViewer();
+    this.renderList();
+    if (this.viewed) {
+      this.initImage(function () {
+        _this3.renderImage();
+      });
+    }
+    if (this.played) {
+      if (this.options.fullscreen && this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+        this.stop();
+        return;
+      }
+      forEach(this.player.getElementsByTagName('img'), function (image) {
+        addListener(image, EVENT_LOAD, _this3.loadImage.bind(_this3), {
+          once: true
+        });
+        dispatchEvent(image, EVENT_LOAD);
+      });
+    }
+  },
+  wheel: function wheel(event) {
+    var _this4 = this;
+    if (!this.viewed) {
+      return;
+    }
+    event.preventDefault();
+
+    // Limit wheel speed to prevent zoom too fast
+    if (this.wheeling) {
+      return;
+    }
+    this.wheeling = true;
+    setTimeout(function () {
+      _this4.wheeling = false;
+    }, 50);
+    var ratio = Number(this.options.zoomRatio) || 0.1;
+    var delta = 1;
+    if (event.deltaY) {
+      delta = event.deltaY > 0 ? 1 : -1;
+    } else if (event.wheelDelta) {
+      delta = -event.wheelDelta / 120;
+    } else if (event.detail) {
+      delta = event.detail > 0 ? 1 : -1;
+    }
+    this.zoom(-delta * ratio, true, null, event);
+  }
+};
+
+var methods = {
+  /** Show the viewer (only available in modal mode)
+   * @param {boolean} [immediate=false] - Indicates if show the viewer immediately or not.
+   * @returns {Viewer} this
+   */
+  show: function show() {
+    var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+    var element = this.element,
+      options = this.options;
+    if (options.inline || this.showing || this.isShown || this.showing) {
+      return this;
+    }
+    if (!this.ready) {
+      this.build();
+      if (this.ready) {
+        this.show(immediate);
+      }
+      return this;
+    }
+    if (isFunction(options.show)) {
+      addListener(element, EVENT_SHOW, options.show, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_SHOW) === false || !this.ready) {
+      return this;
+    }
+    if (this.hiding) {
+      this.transitioning.abort();
+    }
+    this.showing = true;
+    this.open();
+    var viewer = this.viewer;
+    removeClass(viewer, CLASS_HIDE);
+    viewer.setAttribute('role', 'dialog');
+    viewer.setAttribute('aria-labelledby', this.title.id);
+    viewer.setAttribute('aria-modal', true);
+    viewer.removeAttribute('aria-hidden');
+    if (options.transition && !immediate) {
+      var shown = this.shown.bind(this);
+      this.transitioning = {
+        abort: function abort() {
+          removeListener(viewer, EVENT_TRANSITION_END, shown);
+          removeClass(viewer, CLASS_IN);
+        }
+      };
+      addClass(viewer, CLASS_TRANSITION);
+
+      // Force reflow to enable CSS3 transition
+      viewer.initialOffsetWidth = viewer.offsetWidth;
+      addListener(viewer, EVENT_TRANSITION_END, shown, {
+        once: true
+      });
+      addClass(viewer, CLASS_IN);
+    } else {
+      addClass(viewer, CLASS_IN);
+      this.shown();
+    }
+    return this;
+  },
+  /**
+   * Hide the viewer (only available in modal mode)
+   * @param {boolean} [immediate=false] - Indicates if hide the viewer immediately or not.
+   * @returns {Viewer} this
+   */
+  hide: function hide() {
+    var _this = this;
+    var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+    var element = this.element,
+      options = this.options;
+    if (options.inline || this.hiding || !(this.isShown || this.showing)) {
+      return this;
+    }
+    if (isFunction(options.hide)) {
+      addListener(element, EVENT_HIDE, options.hide, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_HIDE) === false) {
+      return this;
+    }
+    if (this.showing) {
+      this.transitioning.abort();
+    }
+    this.hiding = true;
+    if (this.played) {
+      this.stop();
+    } else if (this.viewing) {
+      this.viewing.abort();
+    }
+    var viewer = this.viewer,
+      image = this.image;
+    var hideImmediately = function hideImmediately() {
+      removeClass(viewer, CLASS_IN);
+      _this.hidden();
+    };
+    if (options.transition && !immediate) {
+      var onViewerTransitionEnd = function onViewerTransitionEnd(event) {
+        // Ignore all propagating `transitionend` events (#275).
+        if (event && event.target === viewer) {
+          removeListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
+          _this.hidden();
+        }
+      };
+      var onImageTransitionEnd = function onImageTransitionEnd() {
+        // In case of show the viewer by `viewer.show(true)` previously (#407).
+        if (hasClass(viewer, CLASS_TRANSITION)) {
+          addListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
+          removeClass(viewer, CLASS_IN);
+        } else {
+          hideImmediately();
+        }
+      };
+      this.transitioning = {
+        abort: function abort() {
+          if (_this.viewed && hasClass(image, CLASS_TRANSITION)) {
+            removeListener(image, EVENT_TRANSITION_END, onImageTransitionEnd);
+          } else if (hasClass(viewer, CLASS_TRANSITION)) {
+            removeListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
+          }
+        }
+      };
+
+      // In case of hiding the viewer when holding on the image (#255),
+      // note that the `CLASS_TRANSITION` class will be removed on pointer down.
+      if (this.viewed && hasClass(image, CLASS_TRANSITION)) {
+        addListener(image, EVENT_TRANSITION_END, onImageTransitionEnd, {
+          once: true
+        });
+        this.zoomTo(0, false, null, null, true);
+      } else {
+        onImageTransitionEnd();
+      }
+    } else {
+      hideImmediately();
+    }
+    return this;
+  },
+  /**
+   * View one of the images with image's index
+   * @param {number} index - The index of the image to view.
+   * @returns {Viewer} this
+   */
+  view: function view() {
+    var _this2 = this;
+    var index = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.options.initialViewIndex;
+    index = Number(index) || 0;
+    if (this.hiding || this.played || index < 0 || index >= this.length || this.viewed && index === this.index) {
+      return this;
+    }
+    if (!this.isShown) {
+      this.index = index;
+      return this.show();
+    }
+    if (this.viewing) {
+      this.viewing.abort();
+    }
+    var element = this.element,
+      options = this.options,
+      title = this.title,
+      canvas = this.canvas;
+    var item = this.items[index];
+    var img = item.querySelector('img');
+    var url = getData(img, 'originalUrl');
+    var alt = img.getAttribute('alt');
+    var image = document.createElement('img');
+    forEach(options.inheritedAttributes, function (name) {
+      var value = img.getAttribute(name);
+      if (value !== null) {
+        image.setAttribute(name, value);
+      }
+    });
+    image.src = url;
+    image.alt = alt;
+    if (isFunction(options.view)) {
+      addListener(element, EVENT_VIEW, options.view, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_VIEW, {
+      originalImage: this.images[index],
+      index: index,
+      image: image
+    }) === false || !this.isShown || this.hiding || this.played) {
+      return this;
+    }
+    var activeItem = this.items[this.index];
+    if (activeItem) {
+      removeClass(activeItem, CLASS_ACTIVE);
+      activeItem.removeAttribute('aria-selected');
+    }
+    addClass(item, CLASS_ACTIVE);
+    item.setAttribute('aria-selected', true);
+    if (options.focus) {
+      item.focus();
+    }
+    this.image = image;
+    this.viewed = false;
+    this.index = index;
+    this.imageData = {};
+    addClass(image, CLASS_INVISIBLE);
+    if (options.loading) {
+      addClass(canvas, CLASS_LOADING);
+    }
+    canvas.innerHTML = '';
+    canvas.appendChild(image);
+
+    // Center current item
+    this.renderList();
+
+    // Clear title
+    title.innerHTML = '';
+
+    // Generate title after viewed
+    var onViewed = function onViewed() {
+      var imageData = _this2.imageData;
+      var render = Array.isArray(options.title) ? options.title[1] : options.title;
+      title.innerHTML = escapeHTMLEntities(isFunction(render) ? render.call(_this2, image, imageData) : "".concat(alt, " (").concat(imageData.naturalWidth, " \xD7 ").concat(imageData.naturalHeight, ")"));
+    };
+    var onLoad;
+    var onError;
+    addListener(element, EVENT_VIEWED, onViewed, {
+      once: true
+    });
+    this.viewing = {
+      abort: function abort() {
+        removeListener(element, EVENT_VIEWED, onViewed);
+        if (image.complete) {
+          if (_this2.imageRendering) {
+            _this2.imageRendering.abort();
+          } else if (_this2.imageInitializing) {
+            _this2.imageInitializing.abort();
+          }
+        } else {
+          // Cancel download to save bandwidth.
+          image.src = '';
+          removeListener(image, EVENT_LOAD, onLoad);
+          if (_this2.timeout) {
+            clearTimeout(_this2.timeout);
+          }
+        }
+      }
+    };
+    if (image.complete) {
+      this.load();
+    } else {
+      addListener(image, EVENT_LOAD, onLoad = function onLoad() {
+        removeListener(image, EVENT_ERROR, onError);
+        _this2.load();
+      }, {
+        once: true
+      });
+      addListener(image, EVENT_ERROR, onError = function onError() {
+        removeListener(image, EVENT_LOAD, onLoad);
+        if (_this2.timeout) {
+          clearTimeout(_this2.timeout);
+          _this2.timeout = false;
+        }
+        removeClass(image, CLASS_INVISIBLE);
+        if (options.loading) {
+          removeClass(_this2.canvas, CLASS_LOADING);
+        }
+      }, {
+        once: true
+      });
+      if (this.timeout) {
+        clearTimeout(this.timeout);
+      }
+
+      // Make the image visible if it fails to load within 1s
+      this.timeout = setTimeout(function () {
+        removeClass(image, CLASS_INVISIBLE);
+        _this2.timeout = false;
+      }, 1000);
+    }
+    return this;
+  },
+  /**
+   * View the previous image
+   * @param {boolean} [loop=false] - Indicate if view the last one
+   * when it is the first one at present.
+   * @returns {Viewer} this
+   */
+  prev: function prev() {
+    var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+    var index = this.index - 1;
+    if (index < 0) {
+      index = loop ? this.length - 1 : 0;
+    }
+    this.view(index);
+    return this;
+  },
+  /**
+   * View the next image
+   * @param {boolean} [loop=false] - Indicate if view the first one
+   * when it is the last one at present.
+   * @returns {Viewer} this
+   */
+  next: function next() {
+    var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+    var maxIndex = this.length - 1;
+    var index = this.index + 1;
+    if (index > maxIndex) {
+      index = loop ? 0 : maxIndex;
+    }
+    this.view(index);
+    return this;
+  },
+  /**
+   * Move the image with relative offsets.
+   * @param {number} x - The moving distance in the horizontal direction.
+   * @param {number} [y=x] The moving distance in the vertical direction.
+   * @returns {Viewer} this
+   */
+  move: function move(x) {
+    var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
+    var imageData = this.imageData;
+    this.moveTo(isUndefined(x) ? x : imageData.x + Number(x), isUndefined(y) ? y : imageData.y + Number(y));
+    return this;
+  },
+  /**
+   * Move the image to an absolute point.
+   * @param {number} x - The new position in the horizontal direction.
+   * @param {number} [y=x] - The new position in the vertical direction.
+   * @param {Event} [_originalEvent=null] - The original event if any.
+   * @returns {Viewer} this
+   */
+  moveTo: function moveTo(x) {
+    var _this3 = this;
+    var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
+    var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+    var element = this.element,
+      options = this.options,
+      imageData = this.imageData;
+    x = Number(x);
+    y = Number(y);
+    if (this.viewed && !this.played && options.movable) {
+      var oldX = imageData.x;
+      var oldY = imageData.y;
+      var changed = false;
+      if (isNumber(x)) {
+        changed = true;
+      } else {
+        x = oldX;
+      }
+      if (isNumber(y)) {
+        changed = true;
+      } else {
+        y = oldY;
+      }
+      if (changed) {
+        if (isFunction(options.move)) {
+          addListener(element, EVENT_MOVE, options.move, {
+            once: true
+          });
+        }
+        if (dispatchEvent(element, EVENT_MOVE, {
+          x: x,
+          y: y,
+          oldX: oldX,
+          oldY: oldY,
+          originalEvent: _originalEvent
+        }) === false) {
+          return this;
+        }
+        imageData.x = x;
+        imageData.y = y;
+        imageData.left = x;
+        imageData.top = y;
+        this.moving = true;
+        this.renderImage(function () {
+          _this3.moving = false;
+          if (isFunction(options.moved)) {
+            addListener(element, EVENT_MOVED, options.moved, {
+              once: true
+            });
+          }
+          dispatchEvent(element, EVENT_MOVED, {
+            x: x,
+            y: y,
+            oldX: oldX,
+            oldY: oldY,
+            originalEvent: _originalEvent
+          }, {
+            cancelable: false
+          });
+        });
+      }
+    }
+    return this;
+  },
+  /**
+   * Rotate the image with a relative degree.
+   * @param {number} degree - The rotate degree.
+   * @returns {Viewer} this
+   */
+  rotate: function rotate(degree) {
+    this.rotateTo((this.imageData.rotate || 0) + Number(degree));
+    return this;
+  },
+  /**
+   * Rotate the image to an absolute degree.
+   * @param {number} degree - The rotate degree.
+   * @returns {Viewer} this
+   */
+  rotateTo: function rotateTo(degree) {
+    var _this4 = this;
+    var element = this.element,
+      options = this.options,
+      imageData = this.imageData;
+    degree = Number(degree);
+    if (isNumber(degree) && this.viewed && !this.played && options.rotatable) {
+      var oldDegree = imageData.rotate;
+      if (isFunction(options.rotate)) {
+        addListener(element, EVENT_ROTATE, options.rotate, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_ROTATE, {
+        degree: degree,
+        oldDegree: oldDegree
+      }) === false) {
+        return this;
+      }
+      imageData.rotate = degree;
+      this.rotating = true;
+      this.renderImage(function () {
+        _this4.rotating = false;
+        if (isFunction(options.rotated)) {
+          addListener(element, EVENT_ROTATED, options.rotated, {
+            once: true
+          });
+        }
+        dispatchEvent(element, EVENT_ROTATED, {
+          degree: degree,
+          oldDegree: oldDegree
+        }, {
+          cancelable: false
+        });
+      });
+    }
+    return this;
+  },
+  /**
+   * Scale the image on the x-axis.
+   * @param {number} scaleX - The scale ratio on the x-axis.
+   * @returns {Viewer} this
+   */
+  scaleX: function scaleX(_scaleX) {
+    this.scale(_scaleX, this.imageData.scaleY);
+    return this;
+  },
+  /**
+   * Scale the image on the y-axis.
+   * @param {number} scaleY - The scale ratio on the y-axis.
+   * @returns {Viewer} this
+   */
+  scaleY: function scaleY(_scaleY) {
+    this.scale(this.imageData.scaleX, _scaleY);
+    return this;
+  },
+  /**
+   * Scale the image.
+   * @param {number} scaleX - The scale ratio on the x-axis.
+   * @param {number} [scaleY=scaleX] - The scale ratio on the y-axis.
+   * @returns {Viewer} this
+   */
+  scale: function scale(scaleX) {
+    var _this5 = this;
+    var scaleY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : scaleX;
+    var element = this.element,
+      options = this.options,
+      imageData = this.imageData;
+    scaleX = Number(scaleX);
+    scaleY = Number(scaleY);
+    if (this.viewed && !this.played && options.scalable) {
+      var oldScaleX = imageData.scaleX;
+      var oldScaleY = imageData.scaleY;
+      var changed = false;
+      if (isNumber(scaleX)) {
+        changed = true;
+      } else {
+        scaleX = oldScaleX;
+      }
+      if (isNumber(scaleY)) {
+        changed = true;
+      } else {
+        scaleY = oldScaleY;
+      }
+      if (changed) {
+        if (isFunction(options.scale)) {
+          addListener(element, EVENT_SCALE, options.scale, {
+            once: true
+          });
+        }
+        if (dispatchEvent(element, EVENT_SCALE, {
+          scaleX: scaleX,
+          scaleY: scaleY,
+          oldScaleX: oldScaleX,
+          oldScaleY: oldScaleY
+        }) === false) {
+          return this;
+        }
+        imageData.scaleX = scaleX;
+        imageData.scaleY = scaleY;
+        this.scaling = true;
+        this.renderImage(function () {
+          _this5.scaling = false;
+          if (isFunction(options.scaled)) {
+            addListener(element, EVENT_SCALED, options.scaled, {
+              once: true
+            });
+          }
+          dispatchEvent(element, EVENT_SCALED, {
+            scaleX: scaleX,
+            scaleY: scaleY,
+            oldScaleX: oldScaleX,
+            oldScaleY: oldScaleY
+          }, {
+            cancelable: false
+          });
+        });
+      }
+    }
+    return this;
+  },
+  /**
+   * Zoom the image with a relative ratio.
+   * @param {number} ratio - The target ratio.
+   * @param {boolean} [showTooltip=false] - Indicates whether to show the tooltip.
+   * @param {Object} [pivot] - The pivot point coordinate for zooming.
+   * @param {Event} [_originalEvent=null] - The original event if any.
+   * @returns {Viewer} this
+   */
+  zoom: function zoom(ratio) {
+    var showTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
+    var pivot = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+    var _originalEvent = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
+    var imageData = this.imageData;
+    ratio = Number(ratio);
+    if (ratio < 0) {
+      ratio = 1 / (1 - ratio);
+    } else {
+      ratio = 1 + ratio;
+    }
+    this.zoomTo(imageData.width * ratio / imageData.naturalWidth, showTooltip, pivot, _originalEvent);
+    return this;
+  },
+  /**
+   * Zoom the image to an absolute ratio.
+   * @param {number} ratio - The target ratio.
+   * @param {boolean} [showTooltip] - Indicates whether to show the tooltip.
+   * @param {Object} [pivot] - The pivot point coordinate for zooming.
+   * @param {Event} [_originalEvent=null] - The original event if any.
+   * @param {Event} [_zoomable=false] - Indicates if the current zoom is available or not.
+   * @returns {Viewer} this
+   */
+  zoomTo: function zoomTo(ratio) {
+    var _this6 = this;
+    var showTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
+    var pivot = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+    var _originalEvent = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
+    var _zoomable = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : false;
+    var element = this.element,
+      options = this.options,
+      pointers = this.pointers,
+      imageData = this.imageData;
+    var x = imageData.x,
+      y = imageData.y,
+      width = imageData.width,
+      height = imageData.height,
+      naturalWidth = imageData.naturalWidth,
+      naturalHeight = imageData.naturalHeight;
+    ratio = Math.max(0, ratio);
+    if (isNumber(ratio) && this.viewed && !this.played && (_zoomable || options.zoomable)) {
+      if (!_zoomable) {
+        var minZoomRatio = Math.max(0.01, options.minZoomRatio);
+        var maxZoomRatio = Math.min(100, options.maxZoomRatio);
+        ratio = Math.min(Math.max(ratio, minZoomRatio), maxZoomRatio);
+      }
+      if (_originalEvent) {
+        switch (_originalEvent.type) {
+          case 'wheel':
+            if (options.zoomRatio >= 0.055 && ratio > 0.95 && ratio < 1.05) {
+              ratio = 1;
+            }
+            break;
+          case 'pointermove':
+          case 'touchmove':
+          case 'mousemove':
+            if (ratio > 0.99 && ratio < 1.01) {
+              ratio = 1;
+            }
+            break;
+        }
+      }
+      var newWidth = naturalWidth * ratio;
+      var newHeight = naturalHeight * ratio;
+      var offsetWidth = newWidth - width;
+      var offsetHeight = newHeight - height;
+      var oldRatio = imageData.ratio;
+      if (isFunction(options.zoom)) {
+        addListener(element, EVENT_ZOOM, options.zoom, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_ZOOM, {
+        ratio: ratio,
+        oldRatio: oldRatio,
+        originalEvent: _originalEvent
+      }) === false) {
+        return this;
+      }
+      this.zooming = true;
+      if (_originalEvent) {
+        var offset = getOffset(this.viewer);
+        var center = pointers && Object.keys(pointers).length > 0 ? getPointersCenter(pointers) : {
+          pageX: _originalEvent.pageX,
+          pageY: _originalEvent.pageY
+        };
+
+        // Zoom from the triggering point of the event
+        imageData.x -= offsetWidth * ((center.pageX - offset.left - x) / width);
+        imageData.y -= offsetHeight * ((center.pageY - offset.top - y) / height);
+      } else if (isPlainObject(pivot) && isNumber(pivot.x) && isNumber(pivot.y)) {
+        imageData.x -= offsetWidth * ((pivot.x - x) / width);
+        imageData.y -= offsetHeight * ((pivot.y - y) / height);
+      } else {
+        // Zoom from the center of the image
+        imageData.x -= offsetWidth / 2;
+        imageData.y -= offsetHeight / 2;
+      }
+      imageData.left = imageData.x;
+      imageData.top = imageData.y;
+      imageData.width = newWidth;
+      imageData.height = newHeight;
+      imageData.oldRatio = oldRatio;
+      imageData.ratio = ratio;
+      this.renderImage(function () {
+        _this6.zooming = false;
+        if (isFunction(options.zoomed)) {
+          addListener(element, EVENT_ZOOMED, options.zoomed, {
+            once: true
+          });
+        }
+        dispatchEvent(element, EVENT_ZOOMED, {
+          ratio: ratio,
+          oldRatio: oldRatio,
+          originalEvent: _originalEvent
+        }, {
+          cancelable: false
+        });
+      });
+      if (showTooltip) {
+        this.tooltip();
+      }
+    }
+    return this;
+  },
+  /**
+   * Play the images
+   * @param {boolean|FullscreenOptions} [fullscreen=false] - Indicate if request fullscreen or not.
+   * @returns {Viewer} this
+   */
+  play: function play() {
+    var _this7 = this;
+    var fullscreen = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+    if (!this.isShown || this.played) {
+      return this;
+    }
+    var element = this.element,
+      options = this.options;
+    if (isFunction(options.play)) {
+      addListener(element, EVENT_PLAY, options.play, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_PLAY) === false) {
+      return this;
+    }
+    var player = this.player;
+    var onLoad = this.loadImage.bind(this);
+    var list = [];
+    var total = 0;
+    var index = 0;
+    this.played = true;
+    this.onLoadWhenPlay = onLoad;
+    if (fullscreen) {
+      this.requestFullscreen(fullscreen);
+    }
+    addClass(player, CLASS_SHOW);
+    forEach(this.items, function (item, i) {
+      var img = item.querySelector('img');
+      var image = document.createElement('img');
+      image.src = getData(img, 'originalUrl');
+      image.alt = img.getAttribute('alt');
+      image.referrerPolicy = img.referrerPolicy;
+      total += 1;
+      addClass(image, CLASS_FADE);
+      toggleClass(image, CLASS_TRANSITION, options.transition);
+      if (hasClass(item, CLASS_ACTIVE)) {
+        addClass(image, CLASS_IN);
+        index = i;
+      }
+      list.push(image);
+      addListener(image, EVENT_LOAD, onLoad, {
+        once: true
+      });
+      player.appendChild(image);
+    });
+    if (isNumber(options.interval) && options.interval > 0) {
+      var prev = function prev() {
+        clearTimeout(_this7.playing.timeout);
+        removeClass(list[index], CLASS_IN);
+        index -= 1;
+        index = index >= 0 ? index : total - 1;
+        addClass(list[index], CLASS_IN);
+        _this7.playing.timeout = setTimeout(prev, options.interval);
+      };
+      var next = function next() {
+        clearTimeout(_this7.playing.timeout);
+        removeClass(list[index], CLASS_IN);
+        index += 1;
+        index = index < total ? index : 0;
+        addClass(list[index], CLASS_IN);
+        _this7.playing.timeout = setTimeout(next, options.interval);
+      };
+      if (total > 1) {
+        this.playing = {
+          prev: prev,
+          next: next,
+          timeout: setTimeout(next, options.interval)
+        };
+      }
+    }
+    return this;
+  },
+  // Stop play
+  stop: function stop() {
+    var _this8 = this;
+    if (!this.played) {
+      return this;
+    }
+    var element = this.element,
+      options = this.options;
+    if (isFunction(options.stop)) {
+      addListener(element, EVENT_STOP, options.stop, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_STOP) === false) {
+      return this;
+    }
+    var player = this.player;
+    clearTimeout(this.playing.timeout);
+    this.playing = false;
+    this.played = false;
+    forEach(player.getElementsByTagName('img'), function (image) {
+      removeListener(image, EVENT_LOAD, _this8.onLoadWhenPlay);
+    });
+    removeClass(player, CLASS_SHOW);
+    player.innerHTML = '';
+    this.exitFullscreen();
+    return this;
+  },
+  // Enter modal mode (only available in inline mode)
+  full: function full() {
+    var _this9 = this;
+    var options = this.options,
+      viewer = this.viewer,
+      image = this.image,
+      list = this.list;
+    if (!this.isShown || this.played || this.fulled || !options.inline) {
+      return this;
+    }
+    this.fulled = true;
+    this.open();
+    addClass(this.button, CLASS_FULLSCREEN_EXIT);
+    if (options.transition) {
+      removeClass(list, CLASS_TRANSITION);
+      if (this.viewed) {
+        removeClass(image, CLASS_TRANSITION);
+      }
+    }
+    addClass(viewer, CLASS_FIXED);
+    viewer.setAttribute('role', 'dialog');
+    viewer.setAttribute('aria-labelledby', this.title.id);
+    viewer.setAttribute('aria-modal', true);
+    viewer.removeAttribute('style');
+    setStyle(viewer, {
+      zIndex: options.zIndex
+    });
+    if (options.focus) {
+      this.enforceFocus();
+    }
+    this.initContainer();
+    this.viewerData = assign({}, this.containerData);
+    this.renderList();
+    if (this.viewed) {
+      this.initImage(function () {
+        _this9.renderImage(function () {
+          if (options.transition) {
+            setTimeout(function () {
+              addClass(image, CLASS_TRANSITION);
+              addClass(list, CLASS_TRANSITION);
+            }, 0);
+          }
+        });
+      });
+    }
+    return this;
+  },
+  // Exit modal mode (only available in inline mode)
+  exit: function exit() {
+    var _this10 = this;
+    var options = this.options,
+      viewer = this.viewer,
+      image = this.image,
+      list = this.list;
+    if (!this.isShown || this.played || !this.fulled || !options.inline) {
+      return this;
+    }
+    this.fulled = false;
+    this.close();
+    removeClass(this.button, CLASS_FULLSCREEN_EXIT);
+    if (options.transition) {
+      removeClass(list, CLASS_TRANSITION);
+      if (this.viewed) {
+        removeClass(image, CLASS_TRANSITION);
+      }
+    }
+    if (options.focus) {
+      this.clearEnforceFocus();
+    }
+    viewer.removeAttribute('role');
+    viewer.removeAttribute('aria-labelledby');
+    viewer.removeAttribute('aria-modal');
+    removeClass(viewer, CLASS_FIXED);
+    setStyle(viewer, {
+      zIndex: options.zIndexInline
+    });
+    this.viewerData = assign({}, this.parentData);
+    this.renderViewer();
+    this.renderList();
+    if (this.viewed) {
+      this.initImage(function () {
+        _this10.renderImage(function () {
+          if (options.transition) {
+            setTimeout(function () {
+              addClass(image, CLASS_TRANSITION);
+              addClass(list, CLASS_TRANSITION);
+            }, 0);
+          }
+        });
+      });
+    }
+    return this;
+  },
+  // Show the current ratio of the image with percentage
+  tooltip: function tooltip() {
+    var _this11 = this;
+    var options = this.options,
+      tooltipBox = this.tooltipBox,
+      imageData = this.imageData;
+    if (!this.viewed || this.played || !options.tooltip) {
+      return this;
+    }
+    tooltipBox.textContent = "".concat(Math.round(imageData.ratio * 100), "%");
+    if (!this.tooltipping) {
+      if (options.transition) {
+        if (this.fading) {
+          dispatchEvent(tooltipBox, EVENT_TRANSITION_END);
+        }
+        addClass(tooltipBox, CLASS_SHOW);
+        addClass(tooltipBox, CLASS_FADE);
+        addClass(tooltipBox, CLASS_TRANSITION);
+        tooltipBox.removeAttribute('aria-hidden');
+
+        // Force reflow to enable CSS3 transition
+        tooltipBox.initialOffsetWidth = tooltipBox.offsetWidth;
+        addClass(tooltipBox, CLASS_IN);
+      } else {
+        addClass(tooltipBox, CLASS_SHOW);
+        tooltipBox.removeAttribute('aria-hidden');
+      }
+    } else {
+      clearTimeout(this.tooltipping);
+    }
+    this.tooltipping = setTimeout(function () {
+      if (options.transition) {
+        addListener(tooltipBox, EVENT_TRANSITION_END, function () {
+          removeClass(tooltipBox, CLASS_SHOW);
+          removeClass(tooltipBox, CLASS_FADE);
+          removeClass(tooltipBox, CLASS_TRANSITION);
+          tooltipBox.setAttribute('aria-hidden', true);
+          _this11.fading = false;
+        }, {
+          once: true
+        });
+        removeClass(tooltipBox, CLASS_IN);
+        _this11.fading = true;
+      } else {
+        removeClass(tooltipBox, CLASS_SHOW);
+        tooltipBox.setAttribute('aria-hidden', true);
+      }
+      _this11.tooltipping = false;
+    }, 1000);
+    return this;
+  },
+  /**
+   * Toggle the image size between its current size and natural size
+   * @param {Event} [_originalEvent=null] - The original event if any.
+   * @returns {Viewer} this
+   */
+  toggle: function toggle() {
+    var _originalEvent = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
+    if (this.imageData.ratio === 1) {
+      this.zoomTo(this.imageData.oldRatio, true, null, _originalEvent);
+    } else {
+      this.zoomTo(1, true, null, _originalEvent);
+    }
+    return this;
+  },
+  // Reset the image to its initial state
+  reset: function reset() {
+    if (this.viewed && !this.played) {
+      this.imageData = assign({}, this.initialImageData);
+      this.renderImage();
+    }
+    return this;
+  },
+  // Update viewer when images changed
+  update: function update() {
+    var _this12 = this;
+    var element = this.element,
+      options = this.options,
+      isImg = this.isImg;
+
+    // Destroy viewer if the target image was deleted
+    if (isImg && !element.parentNode) {
+      return this.destroy();
+    }
+    var images = [];
+    forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
+      if (isFunction(options.filter)) {
+        if (options.filter.call(_this12, image)) {
+          images.push(image);
+        }
+      } else if (_this12.getImageURL(image)) {
+        images.push(image);
+      }
+    });
+    if (!images.length) {
+      return this;
+    }
+    this.images = images;
+    this.length = images.length;
+    if (this.ready) {
+      var changedIndexes = [];
+      forEach(this.items, function (item, i) {
+        var img = item.querySelector('img');
+        var image = images[i];
+        if (image && img) {
+          if (image.src !== img.src
+
+          // Title changed (#408)
+          || image.alt !== img.alt) {
+            changedIndexes.push(i);
+          }
+        } else {
+          changedIndexes.push(i);
+        }
+      });
+      setStyle(this.list, {
+        width: 'auto'
+      });
+      this.initList();
+      if (this.isShown) {
+        if (this.length) {
+          if (this.viewed) {
+            var changedIndex = changedIndexes.indexOf(this.index);
+            if (changedIndex >= 0) {
+              this.viewed = false;
+              this.view(Math.max(Math.min(this.index - changedIndex, this.length - 1), 0));
+            } else {
+              var activeItem = this.items[this.index];
+
+              // Reactivate the current viewing item after reset the list.
+              addClass(activeItem, CLASS_ACTIVE);
+              activeItem.setAttribute('aria-selected', true);
+            }
+          }
+        } else {
+          this.image = null;
+          this.viewed = false;
+          this.index = 0;
+          this.imageData = {};
+          this.canvas.innerHTML = '';
+          this.title.innerHTML = '';
+        }
+      }
+    } else {
+      this.build();
+    }
+    return this;
+  },
+  // Destroy the viewer
+  destroy: function destroy() {
+    var element = this.element,
+      options = this.options;
+    if (!element[NAMESPACE]) {
+      return this;
+    }
+    this.destroyed = true;
+    if (this.ready) {
+      if (this.played) {
+        this.stop();
+      }
+      if (options.inline) {
+        if (this.fulled) {
+          this.exit();
+        }
+        this.unbind();
+      } else if (this.isShown) {
+        if (this.viewing) {
+          if (this.imageRendering) {
+            this.imageRendering.abort();
+          } else if (this.imageInitializing) {
+            this.imageInitializing.abort();
+          }
+        }
+        if (this.hiding) {
+          this.transitioning.abort();
+        }
+        this.hidden();
+      } else if (this.showing) {
+        this.transitioning.abort();
+        this.hidden();
+      }
+      this.ready = false;
+      this.viewer.parentNode.removeChild(this.viewer);
+    } else if (options.inline) {
+      if (this.delaying) {
+        this.delaying.abort();
+      } else if (this.initializing) {
+        this.initializing.abort();
+      }
+    }
+    if (!options.inline) {
+      removeListener(element, EVENT_CLICK, this.onStart);
+    }
+    element[NAMESPACE] = undefined;
+    return this;
+  }
+};
+
+var others = {
+  getImageURL: function getImageURL(image) {
+    var url = this.options.url;
+    if (isString(url)) {
+      url = image.getAttribute(url);
+    } else if (isFunction(url)) {
+      url = url.call(this, image);
+    } else {
+      url = '';
+    }
+    return url;
+  },
+  enforceFocus: function enforceFocus() {
+    var _this = this;
+    this.clearEnforceFocus();
+    addListener(document, EVENT_FOCUSIN, this.onFocusin = function (event) {
+      var viewer = _this.viewer;
+      var target = event.target;
+      if (target === document || target === viewer || viewer.contains(target)) {
+        return;
+      }
+      while (target) {
+        // Avoid conflicts with other modals (#474, #540)
+        if (target.getAttribute('tabindex') !== null || target.getAttribute('aria-modal') === 'true') {
+          return;
+        }
+        target = target.parentElement;
+      }
+      viewer.focus();
+    });
+  },
+  clearEnforceFocus: function clearEnforceFocus() {
+    if (this.onFocusin) {
+      removeListener(document, EVENT_FOCUSIN, this.onFocusin);
+      this.onFocusin = null;
+    }
+  },
+  open: function open() {
+    var body = this.body;
+    addClass(body, CLASS_OPEN);
+    if (this.scrollbarWidth > 0) {
+      body.style.paddingRight = "".concat(this.scrollbarWidth + (parseFloat(this.initialBodyComputedPaddingRight) || 0), "px");
+    }
+  },
+  close: function close() {
+    var body = this.body;
+    removeClass(body, CLASS_OPEN);
+    if (this.scrollbarWidth > 0) {
+      body.style.paddingRight = this.initialBodyPaddingRight;
+    }
+  },
+  shown: function shown() {
+    var element = this.element,
+      options = this.options,
+      viewer = this.viewer;
+    this.fulled = true;
+    this.isShown = true;
+    this.render();
+    this.bind();
+    this.showing = false;
+    if (options.focus) {
+      viewer.focus();
+      this.enforceFocus();
+    }
+    if (isFunction(options.shown)) {
+      addListener(element, EVENT_SHOWN, options.shown, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_SHOWN) === false) {
+      return;
+    }
+    if (this.ready && this.isShown && !this.hiding) {
+      this.view(this.index);
+    }
+  },
+  hidden: function hidden() {
+    var element = this.element,
+      options = this.options,
+      viewer = this.viewer;
+    if (options.fucus) {
+      this.clearEnforceFocus();
+    }
+    this.fulled = false;
+    this.viewed = false;
+    this.isShown = false;
+    this.close();
+    this.unbind();
+    addClass(viewer, CLASS_HIDE);
+    viewer.removeAttribute('role');
+    viewer.removeAttribute('aria-labelledby');
+    viewer.removeAttribute('aria-modal');
+    viewer.setAttribute('aria-hidden', true);
+    this.resetList();
+    this.resetImage();
+    this.hiding = false;
+    if (!this.destroyed) {
+      if (isFunction(options.hidden)) {
+        addListener(element, EVENT_HIDDEN, options.hidden, {
+          once: true
+        });
+      }
+      dispatchEvent(element, EVENT_HIDDEN, null, {
+        cancelable: false
+      });
+    }
+  },
+  requestFullscreen: function requestFullscreen(options) {
+    var document = this.element.ownerDocument;
+    if (this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+      var documentElement = document.documentElement;
+
+      // Element.requestFullscreen()
+      if (documentElement.requestFullscreen) {
+        // Avoid TypeError when convert `options` to dictionary
+        if (isPlainObject(options)) {
+          documentElement.requestFullscreen(options);
+        } else {
+          documentElement.requestFullscreen();
+        }
+      } else if (documentElement.webkitRequestFullscreen) {
+        documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
+      } else if (documentElement.mozRequestFullScreen) {
+        documentElement.mozRequestFullScreen();
+      } else if (documentElement.msRequestFullscreen) {
+        documentElement.msRequestFullscreen();
+      }
+    }
+  },
+  exitFullscreen: function exitFullscreen() {
+    var document = this.element.ownerDocument;
+    if (this.fulled && (document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+      // Document.exitFullscreen()
+      if (document.exitFullscreen) {
+        document.exitFullscreen();
+      } else if (document.webkitExitFullscreen) {
+        document.webkitExitFullscreen();
+      } else if (document.mozCancelFullScreen) {
+        document.mozCancelFullScreen();
+      } else if (document.msExitFullscreen) {
+        document.msExitFullscreen();
+      }
+    }
+  },
+  change: function change(event) {
+    var options = this.options,
+      pointers = this.pointers;
+    var pointer = pointers[Object.keys(pointers)[0]];
+
+    // In the case of the `pointers` object is empty (#421)
+    if (!pointer) {
+      return;
+    }
+    var offsetX = pointer.endX - pointer.startX;
+    var offsetY = pointer.endY - pointer.startY;
+    switch (this.action) {
+      // Move the current image
+      case ACTION_MOVE:
+        this.move(offsetX, offsetY, event);
+        break;
+
+      // Zoom the current image
+      case ACTION_ZOOM:
+        this.zoom(getMaxZoomRatio(pointers), false, null, event);
+        break;
+      case ACTION_SWITCH:
+        {
+          this.action = 'switched';
+          var absoluteOffsetX = Math.abs(offsetX);
+          if (absoluteOffsetX > 1 && absoluteOffsetX > Math.abs(offsetY)) {
+            // Empty `pointers` as `touchend` event will not be fired after swiped in iOS browsers.
+            this.pointers = {};
+            if (offsetX > 1) {
+              this.prev(options.loop);
+            } else if (offsetX < -1) {
+              this.next(options.loop);
+            }
+          }
+          break;
+        }
+    }
+
+    // Override
+    forEach(pointers, function (p) {
+      p.startX = p.endX;
+      p.startY = p.endY;
+    });
+  },
+  isSwitchable: function isSwitchable() {
+    var imageData = this.imageData,
+      viewerData = this.viewerData;
+    return this.length > 1 && imageData.x >= 0 && imageData.y >= 0 && imageData.width <= viewerData.width && imageData.height <= viewerData.height;
+  }
+};
+
+var AnotherViewer = WINDOW.Viewer;
+var getUniqueID = function (id) {
+  return function () {
+    id += 1;
+    return id;
+  };
+}(-1);
+var Viewer = /*#__PURE__*/function () {
+  /**
+   * Create a new Viewer.
+   * @param {Element} element - The target element for viewing.
+   * @param {Object} [options={}] - The configuration options.
+   */
+  function Viewer(element) {
+    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+    _classCallCheck(this, Viewer);
+    if (!element || element.nodeType !== 1) {
+      throw new Error('The first argument is required and must be an element.');
+    }
+    this.element = element;
+    this.options = assign({}, DEFAULTS, isPlainObject(options) && options);
+    this.action = false;
+    this.fading = false;
+    this.fulled = false;
+    this.hiding = false;
+    this.imageClicked = false;
+    this.imageData = {};
+    this.index = this.options.initialViewIndex;
+    this.isImg = false;
+    this.isShown = false;
+    this.length = 0;
+    this.moving = false;
+    this.played = false;
+    this.playing = false;
+    this.pointers = {};
+    this.ready = false;
+    this.rotating = false;
+    this.scaling = false;
+    this.showing = false;
+    this.timeout = false;
+    this.tooltipping = false;
+    this.viewed = false;
+    this.viewing = false;
+    this.wheeling = false;
+    this.zooming = false;
+    this.pointerMoved = false;
+    this.id = getUniqueID();
+    this.init();
+  }
+  _createClass(Viewer, [{
+    key: "init",
+    value: function init() {
+      var _this = this;
+      var element = this.element,
+        options = this.options;
+      if (element[NAMESPACE]) {
+        return;
+      }
+      element[NAMESPACE] = this;
+
+      // The `focus` option requires the `keyboard` option set to `true`.
+      if (options.focus && !options.keyboard) {
+        options.focus = false;
+      }
+      var isImg = element.localName === 'img';
+      var images = [];
+      forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
+        if (isFunction(options.filter)) {
+          if (options.filter.call(_this, image)) {
+            images.push(image);
+          }
+        } else if (_this.getImageURL(image)) {
+          images.push(image);
+        }
+      });
+      this.isImg = isImg;
+      this.length = images.length;
+      this.images = images;
+      this.initBody();
+
+      // Override `transition` option if it is not supported
+      if (isUndefined(document.createElement(NAMESPACE).style.transition)) {
+        options.transition = false;
+      }
+      if (options.inline) {
+        var count = 0;
+        var progress = function progress() {
+          count += 1;
+          if (count === _this.length) {
+            var timeout;
+            _this.initializing = false;
+            _this.delaying = {
+              abort: function abort() {
+                clearTimeout(timeout);
+              }
+            };
+
+            // build asynchronously to keep `this.viewer` is accessible in `ready` event handler.
+            timeout = setTimeout(function () {
+              _this.delaying = false;
+              _this.build();
+            }, 0);
+          }
+        };
+        this.initializing = {
+          abort: function abort() {
+            forEach(images, function (image) {
+              if (!image.complete) {
+                removeListener(image, EVENT_LOAD, progress);
+                removeListener(image, EVENT_ERROR, progress);
+              }
+            });
+          }
+        };
+        forEach(images, function (image) {
+          if (image.complete) {
+            progress();
+          } else {
+            var onLoad;
+            var onError;
+            addListener(image, EVENT_LOAD, onLoad = function onLoad() {
+              removeListener(image, EVENT_ERROR, onError);
+              progress();
+            }, {
+              once: true
+            });
+            addListener(image, EVENT_ERROR, onError = function onError() {
+              removeListener(image, EVENT_LOAD, onLoad);
+              progress();
+            }, {
+              once: true
+            });
+          }
+        });
+      } else {
+        addListener(element, EVENT_CLICK, this.onStart = function (_ref) {
+          var target = _ref.target;
+          if (target.localName === 'img' && (!isFunction(options.filter) || options.filter.call(_this, target))) {
+            _this.view(_this.images.indexOf(target));
+          }
+        });
+      }
+    }
+  }, {
+    key: "build",
+    value: function build() {
+      if (this.ready) {
+        return;
+      }
+      var element = this.element,
+        options = this.options;
+      var parent = element.parentNode;
+      var template = document.createElement('div');
+      template.innerHTML = TEMPLATE;
+      var viewer = template.querySelector(".".concat(NAMESPACE, "-container"));
+      var title = viewer.querySelector(".".concat(NAMESPACE, "-title"));
+      var toolbar = viewer.querySelector(".".concat(NAMESPACE, "-toolbar"));
+      var navbar = viewer.querySelector(".".concat(NAMESPACE, "-navbar"));
+      var button = viewer.querySelector(".".concat(NAMESPACE, "-button"));
+      var canvas = viewer.querySelector(".".concat(NAMESPACE, "-canvas"));
+      this.parent = parent;
+      this.viewer = viewer;
+      this.title = title;
+      this.toolbar = toolbar;
+      this.navbar = navbar;
+      this.button = button;
+      this.canvas = canvas;
+      this.footer = viewer.querySelector(".".concat(NAMESPACE, "-footer"));
+      this.tooltipBox = viewer.querySelector(".".concat(NAMESPACE, "-tooltip"));
+      this.player = viewer.querySelector(".".concat(NAMESPACE, "-player"));
+      this.list = viewer.querySelector(".".concat(NAMESPACE, "-list"));
+      viewer.id = "".concat(NAMESPACE).concat(this.id);
+      title.id = "".concat(NAMESPACE, "Title").concat(this.id);
+      addClass(title, !options.title ? CLASS_HIDE : getResponsiveClass(Array.isArray(options.title) ? options.title[0] : options.title));
+      addClass(navbar, !options.navbar ? CLASS_HIDE : getResponsiveClass(options.navbar));
+      toggleClass(button, CLASS_HIDE, !options.button);
+      if (options.keyboard) {
+        button.setAttribute('tabindex', 0);
+      }
+      if (options.backdrop) {
+        addClass(viewer, "".concat(NAMESPACE, "-backdrop"));
+        if (!options.inline && options.backdrop !== 'static') {
+          setData(canvas, DATA_ACTION, 'hide');
+        }
+      }
+      if (isString(options.className) && options.className) {
+        // In case there are multiple class names
+        options.className.split(REGEXP_SPACES).forEach(function (className) {
+          addClass(viewer, className);
+        });
+      }
+      if (options.toolbar) {
+        var list = document.createElement('ul');
+        var custom = isPlainObject(options.toolbar);
+        var zoomButtons = BUTTONS.slice(0, 3);
+        var rotateButtons = BUTTONS.slice(7, 9);
+        var scaleButtons = BUTTONS.slice(9);
+        if (!custom) {
+          addClass(toolbar, getResponsiveClass(options.toolbar));
+        }
+        forEach(custom ? options.toolbar : BUTTONS, function (value, index) {
+          var deep = custom && isPlainObject(value);
+          var name = custom ? hyphenate(index) : value;
+          var show = deep && !isUndefined(value.show) ? value.show : value;
+          if (!show || !options.zoomable && zoomButtons.indexOf(name) !== -1 || !options.rotatable && rotateButtons.indexOf(name) !== -1 || !options.scalable && scaleButtons.indexOf(name) !== -1) {
+            return;
+          }
+          var size = deep && !isUndefined(value.size) ? value.size : value;
+          var click = deep && !isUndefined(value.click) ? value.click : value;
+          var item = document.createElement('li');
+          if (options.keyboard) {
+            item.setAttribute('tabindex', 0);
+          }
+          item.setAttribute('role', 'button');
+          addClass(item, "".concat(NAMESPACE, "-").concat(name));
+          if (!isFunction(click)) {
+            setData(item, DATA_ACTION, name);
+          }
+          if (isNumber(show)) {
+            addClass(item, getResponsiveClass(show));
+          }
+          if (['small', 'large'].indexOf(size) !== -1) {
+            addClass(item, "".concat(NAMESPACE, "-").concat(size));
+          } else if (name === 'play') {
+            addClass(item, "".concat(NAMESPACE, "-large"));
+          }
+          if (isFunction(click)) {
+            addListener(item, EVENT_CLICK, click);
+          }
+          list.appendChild(item);
+        });
+        toolbar.appendChild(list);
+      } else {
+        addClass(toolbar, CLASS_HIDE);
+      }
+      if (!options.rotatable) {
+        var rotates = toolbar.querySelectorAll('li[class*="rotate"]');
+        addClass(rotates, CLASS_INVISIBLE);
+        forEach(rotates, function (rotate) {
+          toolbar.appendChild(rotate);
+        });
+      }
+      if (options.inline) {
+        addClass(button, CLASS_FULLSCREEN);
+        setStyle(viewer, {
+          zIndex: options.zIndexInline
+        });
+        if (window.getComputedStyle(parent).position === 'static') {
+          setStyle(parent, {
+            position: 'relative'
+          });
+        }
+        parent.insertBefore(viewer, element.nextSibling);
+      } else {
+        addClass(button, CLASS_CLOSE);
+        addClass(viewer, CLASS_FIXED);
+        addClass(viewer, CLASS_FADE);
+        addClass(viewer, CLASS_HIDE);
+        setStyle(viewer, {
+          zIndex: options.zIndex
+        });
+        var container = options.container;
+        if (isString(container)) {
+          container = element.ownerDocument.querySelector(container);
+        }
+        if (!container) {
+          container = this.body;
+        }
+        container.appendChild(viewer);
+      }
+      if (options.inline) {
+        this.render();
+        this.bind();
+        this.isShown = true;
+      }
+      this.ready = true;
+      if (isFunction(options.ready)) {
+        addListener(element, EVENT_READY, options.ready, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_READY) === false) {
+        this.ready = false;
+        return;
+      }
+      if (this.ready && options.inline) {
+        this.view(this.index);
+      }
+    }
+
+    /**
+     * Get the no conflict viewer class.
+     * @returns {Viewer} The viewer class.
+     */
+  }], [{
+    key: "noConflict",
+    value: function noConflict() {
+      window.Viewer = AnotherViewer;
+      return Viewer;
+    }
+
+    /**
+     * Change the default options.
+     * @param {Object} options - The new default options.
+     */
+  }, {
+    key: "setDefaults",
+    value: function setDefaults(options) {
+      assign(DEFAULTS, isPlainObject(options) && options);
+    }
+  }]);
+  return Viewer;
+}();
+assign(Viewer.prototype, render, events, handlers, methods, others);
+
+module.exports = Viewer;
diff --git a/static/viewerjs/dist/viewer.css b/static/viewerjs/dist/viewer.css
new file mode 100644
index 0000000..8fb4613
--- /dev/null
+++ b/static/viewerjs/dist/viewer.css
@@ -0,0 +1,446 @@
+/*!
+ * Viewer.js v1.11.2
+ * https://fengyuanchen.github.io/viewerjs
+ *
+ * Copyright 2015-present Chen Fengyuan
+ * Released under the MIT license
+ *
+ * Date: 2023-01-01T10:14:47.694Z
+ */
+
+.viewer-zoom-in::before, .viewer-zoom-out::before, .viewer-one-to-one::before, .viewer-reset::before, .viewer-prev::before, .viewer-play::before, .viewer-next::before, .viewer-rotate-left::before, .viewer-rotate-right::before, .viewer-flip-horizontal::before, .viewer-flip-vertical::before, .viewer-fullscreen::before, .viewer-fullscreen-exit::before, .viewer-close::before {
+    background-image: url("data:image/png;base64,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");
+    background-repeat: no-repeat;
+    background-size: 280px;
+    color: transparent;
+    display: block;
+    font-size: 0;
+    height: 20px;
+    line-height: 0;
+    width: 20px;
+  }
+
+.viewer-zoom-in::before {
+  background-position: 0 0;
+  content: "Zoom In";
+}
+
+.viewer-zoom-out::before {
+  background-position: -20px 0;
+  content: "Zoom Out";
+}
+
+.viewer-one-to-one::before {
+  background-position: -40px 0;
+  content: "One to One";
+}
+
+.viewer-reset::before {
+  background-position: -60px 0;
+  content: "Reset";
+}
+
+.viewer-prev::before {
+  background-position: -80px 0;
+  content: "Previous";
+}
+
+.viewer-play::before {
+  background-position: -100px 0;
+  content: "Play";
+}
+
+.viewer-next::before {
+  background-position: -120px 0;
+  content: "Next";
+}
+
+.viewer-rotate-left::before {
+  background-position: -140px 0;
+  content: "Rotate Left";
+}
+
+.viewer-rotate-right::before {
+  background-position: -160px 0;
+  content: "Rotate Right";
+}
+
+.viewer-flip-horizontal::before {
+  background-position: -180px 0;
+  content: "Flip Horizontal";
+}
+
+.viewer-flip-vertical::before {
+  background-position: -200px 0;
+  content: "Flip Vertical";
+}
+
+.viewer-fullscreen::before {
+  background-position: -220px 0;
+  content: "Enter Full Screen";
+}
+
+.viewer-fullscreen-exit::before {
+  background-position: -240px 0;
+  content: "Exit Full Screen";
+}
+
+.viewer-close::before {
+  background-position: -260px 0;
+  content: "Close";
+}
+
+.viewer-container {
+  bottom: 0;
+  direction: ltr;
+  font-size: 0;
+  left: 0;
+  line-height: 0;
+  overflow: hidden;
+  position: absolute;
+  right: 0;
+  -webkit-tap-highlight-color: transparent;
+  top: 0;
+  -ms-touch-action: none;
+      touch-action: none;
+  -webkit-touch-callout: none;
+  -webkit-user-select: none;
+     -moz-user-select: none;
+      -ms-user-select: none;
+          user-select: none;
+}
+
+.viewer-container::-moz-selection, .viewer-container *::-moz-selection {
+    background-color: transparent;
+  }
+
+.viewer-container::selection,
+  .viewer-container *::selection {
+    background-color: transparent;
+  }
+
+.viewer-container:focus {
+    outline: 0;
+  }
+
+.viewer-container img {
+    display: block;
+    height: auto;
+    max-height: none !important;
+    max-width: none !important;
+    min-height: 0 !important;
+    min-width: 0 !important;
+    width: 100%;
+  }
+
+.viewer-canvas {
+  bottom: 0;
+  left: 0;
+  overflow: hidden;
+  position: absolute;
+  right: 0;
+  top: 0;
+}
+
+.viewer-canvas > img {
+    height: auto;
+    margin: 15px auto;
+    max-width: 90% !important;
+    width: auto;
+  }
+
+.viewer-footer {
+  bottom: 0;
+  left: 0;
+  overflow: hidden;
+  position: absolute;
+  right: 0;
+  text-align: center;
+}
+
+.viewer-navbar {
+  background-color: rgba(0, 0, 0, 50%);
+  overflow: hidden;
+}
+
+.viewer-list {
+  box-sizing: content-box;
+  height: 50px;
+  margin: 0;
+  overflow: hidden;
+  padding: 1px 0;
+}
+
+.viewer-list > li {
+    color: transparent;
+    cursor: pointer;
+    float: left;
+    font-size: 0;
+    height: 50px;
+    line-height: 0;
+    opacity: 0.5;
+    overflow: hidden;
+    transition: opacity 0.15s;
+    width: 30px;
+  }
+
+.viewer-list > li:focus,
+    .viewer-list > li:hover {
+      opacity: 0.75;
+    }
+
+.viewer-list > li:focus {
+      outline: 0;
+    }
+
+.viewer-list > li + li {
+      margin-left: 1px;
+    }
+
+.viewer-list > .viewer-loading {
+    position: relative;
+  }
+
+.viewer-list > .viewer-loading::after {
+      border-width: 2px;
+      height: 20px;
+      margin-left: -10px;
+      margin-top: -10px;
+      width: 20px;
+    }
+
+.viewer-list > .viewer-active,
+  .viewer-list > .viewer-active:focus,
+  .viewer-list > .viewer-active:hover {
+    opacity: 1;
+  }
+
+.viewer-player {
+  background-color: #000;
+  bottom: 0;
+  cursor: none;
+  display: none;
+  left: 0;
+  position: absolute;
+  right: 0;
+  top: 0;
+  z-index: 1;
+}
+
+.viewer-player > img {
+    left: 0;
+    position: absolute;
+    top: 0;
+  }
+
+.viewer-toolbar > ul {
+    display: inline-block;
+    margin: 0 auto 5px;
+    overflow: hidden;
+    padding: 6px 3px;
+  }
+
+.viewer-toolbar > ul > li {
+      background-color: rgba(0, 0, 0, 50%);
+      border-radius: 50%;
+      cursor: pointer;
+      float: left;
+      height: 24px;
+      overflow: hidden;
+      transition: background-color 0.15s;
+      width: 24px;
+    }
+
+.viewer-toolbar > ul > li:focus,
+      .viewer-toolbar > ul > li:hover {
+        background-color: rgba(0, 0, 0, 80%);
+      }
+
+.viewer-toolbar > ul > li:focus {
+        box-shadow: 0 0 3px #fff;
+        outline: 0;
+        position: relative;
+        z-index: 1;
+      }
+
+.viewer-toolbar > ul > li::before {
+        margin: 2px;
+      }
+
+.viewer-toolbar > ul > li + li {
+        margin-left: 1px;
+      }
+
+.viewer-toolbar > ul > .viewer-small {
+      height: 18px;
+      margin-bottom: 3px;
+      margin-top: 3px;
+      width: 18px;
+    }
+
+.viewer-toolbar > ul > .viewer-small::before {
+        margin: -1px;
+      }
+
+.viewer-toolbar > ul > .viewer-large {
+      height: 30px;
+      margin-bottom: -3px;
+      margin-top: -3px;
+      width: 30px;
+    }
+
+.viewer-toolbar > ul > .viewer-large::before {
+        margin: 5px;
+      }
+
+.viewer-tooltip {
+  background-color: rgba(0, 0, 0, 80%);
+  border-radius: 10px;
+  color: #fff;
+  display: none;
+  font-size: 12px;
+  height: 20px;
+  left: 50%;
+  line-height: 20px;
+  margin-left: -25px;
+  margin-top: -10px;
+  position: absolute;
+  text-align: center;
+  top: 50%;
+  width: 50px;
+}
+
+.viewer-title {
+  color: #ccc;
+  display: inline-block;
+  font-size: 12px;
+  line-height: 1.2;
+  margin: 5px 5%;
+  max-width: 90%;
+  min-height: 14px;
+  opacity: 0.8;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  transition: opacity 0.15s;
+  white-space: nowrap;
+}
+
+.viewer-title:hover {
+    opacity: 1;
+  }
+
+.viewer-button {
+  -webkit-app-region: no-drag;
+  background-color: rgba(0, 0, 0, 50%);
+  border-radius: 50%;
+  cursor: pointer;
+  height: 80px;
+  overflow: hidden;
+  position: absolute;
+  right: -40px;
+  top: -40px;
+  transition: background-color 0.15s;
+  width: 80px;
+}
+
+.viewer-button:focus,
+  .viewer-button:hover {
+    background-color: rgba(0, 0, 0, 80%);
+  }
+
+.viewer-button:focus {
+    box-shadow: 0 0 3px #fff;
+    outline: 0;
+  }
+
+.viewer-button::before {
+    bottom: 15px;
+    left: 15px;
+    position: absolute;
+  }
+
+.viewer-fixed {
+  position: fixed;
+}
+
+.viewer-open {
+  overflow: hidden;
+}
+
+.viewer-show {
+  display: block;
+}
+
+.viewer-hide {
+  display: none;
+}
+
+.viewer-backdrop {
+  background-color: rgba(0, 0, 0, 50%);
+}
+
+.viewer-invisible {
+  visibility: hidden;
+}
+
+.viewer-move {
+  cursor: move;
+  cursor: grab;
+}
+
+.viewer-fade {
+  opacity: 0;
+}
+
+.viewer-in {
+  opacity: 1;
+}
+
+.viewer-transition {
+  transition: all 0.3s;
+}
+
+@keyframes viewer-spinner {
+  0% {
+    transform: rotate(0deg);
+  }
+
+  100% {
+    transform: rotate(360deg);
+  }
+}
+
+.viewer-loading::after {
+    animation: viewer-spinner 1s linear infinite;
+    border: 4px solid rgba(255, 255, 255, 10%);
+    border-left-color: rgba(255, 255, 255, 50%);
+    border-radius: 50%;
+    content: "";
+    display: inline-block;
+    height: 40px;
+    left: 50%;
+    margin-left: -20px;
+    margin-top: -20px;
+    position: absolute;
+    top: 50%;
+    width: 40px;
+    z-index: 1;
+  }
+
+@media (max-width: 767px) {
+  .viewer-hide-xs-down {
+    display: none;
+  }
+}
+
+@media (max-width: 991px) {
+  .viewer-hide-sm-down {
+    display: none;
+  }
+}
+
+@media (max-width: 1199px) {
+  .viewer-hide-md-down {
+    display: none;
+  }
+}
diff --git a/static/viewerjs/dist/viewer.esm.js b/static/viewerjs/dist/viewer.esm.js
new file mode 100644
index 0000000..fbb881c
--- /dev/null
+++ b/static/viewerjs/dist/viewer.esm.js
@@ -0,0 +1,3233 @@
+/*!
+ * Viewer.js v1.11.2
+ * https://fengyuanchen.github.io/viewerjs
+ *
+ * Copyright 2015-present Chen Fengyuan
+ * Released under the MIT license
+ *
+ * Date: 2023-01-01T10:14:49.638Z
+ */
+
+function ownKeys(object, enumerableOnly) {
+  var keys = Object.keys(object);
+  if (Object.getOwnPropertySymbols) {
+    var symbols = Object.getOwnPropertySymbols(object);
+    enumerableOnly && (symbols = symbols.filter(function (sym) {
+      return Object.getOwnPropertyDescriptor(object, sym).enumerable;
+    })), keys.push.apply(keys, symbols);
+  }
+  return keys;
+}
+function _objectSpread2(target) {
+  for (var i = 1; i < arguments.length; i++) {
+    var source = null != arguments[i] ? arguments[i] : {};
+    i % 2 ? ownKeys(Object(source), !0).forEach(function (key) {
+      _defineProperty(target, key, source[key]);
+    }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) {
+      Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
+    });
+  }
+  return target;
+}
+function _typeof(obj) {
+  "@babel/helpers - typeof";
+
+  return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) {
+    return typeof obj;
+  } : function (obj) {
+    return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
+  }, _typeof(obj);
+}
+function _classCallCheck(instance, Constructor) {
+  if (!(instance instanceof Constructor)) {
+    throw new TypeError("Cannot call a class as a function");
+  }
+}
+function _defineProperties(target, props) {
+  for (var i = 0; i < props.length; i++) {
+    var descriptor = props[i];
+    descriptor.enumerable = descriptor.enumerable || false;
+    descriptor.configurable = true;
+    if ("value" in descriptor) descriptor.writable = true;
+    Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor);
+  }
+}
+function _createClass(Constructor, protoProps, staticProps) {
+  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
+  if (staticProps) _defineProperties(Constructor, staticProps);
+  Object.defineProperty(Constructor, "prototype", {
+    writable: false
+  });
+  return Constructor;
+}
+function _defineProperty(obj, key, value) {
+  key = _toPropertyKey(key);
+  if (key in obj) {
+    Object.defineProperty(obj, key, {
+      value: value,
+      enumerable: true,
+      configurable: true,
+      writable: true
+    });
+  } else {
+    obj[key] = value;
+  }
+  return obj;
+}
+function _toPrimitive(input, hint) {
+  if (typeof input !== "object" || input === null) return input;
+  var prim = input[Symbol.toPrimitive];
+  if (prim !== undefined) {
+    var res = prim.call(input, hint || "default");
+    if (typeof res !== "object") return res;
+    throw new TypeError("@@toPrimitive must return a primitive value.");
+  }
+  return (hint === "string" ? String : Number)(input);
+}
+function _toPropertyKey(arg) {
+  var key = _toPrimitive(arg, "string");
+  return typeof key === "symbol" ? key : String(key);
+}
+
+var DEFAULTS = {
+  /**
+   * Enable a modal backdrop, specify `static` for a backdrop
+   * which doesn't close the modal on click.
+   * @type {boolean}
+   */
+  backdrop: true,
+  /**
+   * Show the button on the top-right of the viewer.
+   * @type {boolean}
+   */
+  button: true,
+  /**
+   * Show the navbar.
+   * @type {boolean | number}
+   */
+  navbar: true,
+  /**
+   * Specify the visibility and the content of the title.
+   * @type {boolean | number | Function | Array}
+   */
+  title: true,
+  /**
+   * Show the toolbar.
+   * @type {boolean | number | Object}
+   */
+  toolbar: true,
+  /**
+   * Custom class name(s) to add to the viewer's root element.
+   * @type {string}
+   */
+  className: '',
+  /**
+   * Define where to put the viewer in modal mode.
+   * @type {string | Element}
+   */
+  container: 'body',
+  /**
+   * Filter the images for viewing. Return true if the image is viewable.
+   * @type {Function}
+   */
+  filter: null,
+  /**
+   * Enable to request fullscreen when play.
+   * {@link https://developer.mozilla.org/en-US/docs/Web/API/FullscreenOptions}
+   * @type {boolean|FullscreenOptions}
+   */
+  fullscreen: true,
+  /**
+   * Define the extra attributes to inherit from the original image.
+   * @type {Array}
+   */
+  inheritedAttributes: ['crossOrigin', 'decoding', 'isMap', 'loading', 'referrerPolicy', 'sizes', 'srcset', 'useMap'],
+  /**
+   * Define the initial coverage of the viewing image.
+   * @type {number}
+   */
+  initialCoverage: 0.9,
+  /**
+   * Define the initial index of the image for viewing.
+   * @type {number}
+   */
+  initialViewIndex: 0,
+  /**
+   * Enable inline mode.
+   * @type {boolean}
+   */
+  inline: false,
+  /**
+   * The amount of time to delay between automatically cycling an image when playing.
+   * @type {number}
+   */
+  interval: 5000,
+  /**
+   * Enable keyboard support.
+   * @type {boolean}
+   */
+  keyboard: true,
+  /**
+   * Focus the viewer when initialized.
+   * @type {boolean}
+   */
+  focus: true,
+  /**
+   * Indicate if show a loading spinner when load image or not.
+   * @type {boolean}
+   */
+  loading: true,
+  /**
+   * Indicate if enable loop viewing or not.
+   * @type {boolean}
+   */
+  loop: true,
+  /**
+   * Min width of the viewer in inline mode.
+   * @type {number}
+   */
+  minWidth: 200,
+  /**
+   * Min height of the viewer in inline mode.
+   * @type {number}
+   */
+  minHeight: 100,
+  /**
+   * Enable to move the image.
+   * @type {boolean}
+   */
+  movable: true,
+  /**
+   * Enable to rotate the image.
+   * @type {boolean}
+   */
+  rotatable: true,
+  /**
+   * Enable to scale the image.
+   * @type {boolean}
+   */
+  scalable: true,
+  /**
+   * Enable to zoom the image.
+   * @type {boolean}
+   */
+  zoomable: true,
+  /**
+   * Enable to zoom the current image by dragging on the touch screen.
+   * @type {boolean}
+   */
+  zoomOnTouch: true,
+  /**
+   * Enable to zoom the image by wheeling mouse.
+   * @type {boolean}
+   */
+  zoomOnWheel: true,
+  /**
+   * Enable to slide to the next or previous image by swiping on the touch screen.
+   * @type {boolean}
+   */
+  slideOnTouch: true,
+  /**
+   * Indicate if toggle the image size between its natural size
+   * and initial size when double click on the image or not.
+   * @type {boolean}
+   */
+  toggleOnDblclick: true,
+  /**
+   * Show the tooltip with image ratio (percentage) when zoom in or zoom out.
+   * @type {boolean}
+   */
+  tooltip: true,
+  /**
+   * Enable CSS3 Transition for some special elements.
+   * @type {boolean}
+   */
+  transition: true,
+  /**
+   * Define the CSS `z-index` value of viewer in modal mode.
+   * @type {number}
+   */
+  zIndex: 2015,
+  /**
+   * Define the CSS `z-index` value of viewer in inline mode.
+   * @type {number}
+   */
+  zIndexInline: 0,
+  /**
+   * Define the ratio when zoom the image by wheeling mouse.
+   * @type {number}
+   */
+  zoomRatio: 0.1,
+  /**
+   * Define the min ratio of the image when zoom out.
+   * @type {number}
+   */
+  minZoomRatio: 0.01,
+  /**
+   * Define the max ratio of the image when zoom in.
+   * @type {number}
+   */
+  maxZoomRatio: 100,
+  /**
+   * Define where to get the original image URL for viewing.
+   * @type {string | Function}
+   */
+  url: 'src',
+  /**
+   * Event shortcuts.
+   * @type {Function}
+   */
+  ready: null,
+  show: null,
+  shown: null,
+  hide: null,
+  hidden: null,
+  view: null,
+  viewed: null,
+  move: null,
+  moved: null,
+  rotate: null,
+  rotated: null,
+  scale: null,
+  scaled: null,
+  zoom: null,
+  zoomed: null,
+  play: null,
+  stop: null
+};
+
+var TEMPLATE = '<div class="viewer-container" tabindex="-1" touch-action="none">' + '<div class="viewer-canvas"></div>' + '<div class="viewer-footer">' + '<div class="viewer-title"></div>' + '<div class="viewer-toolbar"></div>' + '<div class="viewer-navbar">' + '<ul class="viewer-list" role="navigation"></ul>' + '</div>' + '</div>' + '<div class="viewer-tooltip" role="alert" aria-hidden="true"></div>' + '<div class="viewer-button" data-viewer-action="mix" role="button"></div>' + '<div class="viewer-player"></div>' + '</div>';
+
+var IS_BROWSER = typeof window !== 'undefined' && typeof window.document !== 'undefined';
+var WINDOW = IS_BROWSER ? window : {};
+var IS_TOUCH_DEVICE = IS_BROWSER && WINDOW.document.documentElement ? 'ontouchstart' in WINDOW.document.documentElement : false;
+var HAS_POINTER_EVENT = IS_BROWSER ? 'PointerEvent' in WINDOW : false;
+var NAMESPACE = 'viewer';
+
+// Actions
+var ACTION_MOVE = 'move';
+var ACTION_SWITCH = 'switch';
+var ACTION_ZOOM = 'zoom';
+
+// Classes
+var CLASS_ACTIVE = "".concat(NAMESPACE, "-active");
+var CLASS_CLOSE = "".concat(NAMESPACE, "-close");
+var CLASS_FADE = "".concat(NAMESPACE, "-fade");
+var CLASS_FIXED = "".concat(NAMESPACE, "-fixed");
+var CLASS_FULLSCREEN = "".concat(NAMESPACE, "-fullscreen");
+var CLASS_FULLSCREEN_EXIT = "".concat(NAMESPACE, "-fullscreen-exit");
+var CLASS_HIDE = "".concat(NAMESPACE, "-hide");
+var CLASS_HIDE_MD_DOWN = "".concat(NAMESPACE, "-hide-md-down");
+var CLASS_HIDE_SM_DOWN = "".concat(NAMESPACE, "-hide-sm-down");
+var CLASS_HIDE_XS_DOWN = "".concat(NAMESPACE, "-hide-xs-down");
+var CLASS_IN = "".concat(NAMESPACE, "-in");
+var CLASS_INVISIBLE = "".concat(NAMESPACE, "-invisible");
+var CLASS_LOADING = "".concat(NAMESPACE, "-loading");
+var CLASS_MOVE = "".concat(NAMESPACE, "-move");
+var CLASS_OPEN = "".concat(NAMESPACE, "-open");
+var CLASS_SHOW = "".concat(NAMESPACE, "-show");
+var CLASS_TRANSITION = "".concat(NAMESPACE, "-transition");
+
+// Native events
+var EVENT_CLICK = 'click';
+var EVENT_DBLCLICK = 'dblclick';
+var EVENT_DRAG_START = 'dragstart';
+var EVENT_FOCUSIN = 'focusin';
+var EVENT_KEY_DOWN = 'keydown';
+var EVENT_LOAD = 'load';
+var EVENT_ERROR = 'error';
+var EVENT_TOUCH_END = IS_TOUCH_DEVICE ? 'touchend touchcancel' : 'mouseup';
+var EVENT_TOUCH_MOVE = IS_TOUCH_DEVICE ? 'touchmove' : 'mousemove';
+var EVENT_TOUCH_START = IS_TOUCH_DEVICE ? 'touchstart' : 'mousedown';
+var EVENT_POINTER_DOWN = HAS_POINTER_EVENT ? 'pointerdown' : EVENT_TOUCH_START;
+var EVENT_POINTER_MOVE = HAS_POINTER_EVENT ? 'pointermove' : EVENT_TOUCH_MOVE;
+var EVENT_POINTER_UP = HAS_POINTER_EVENT ? 'pointerup pointercancel' : EVENT_TOUCH_END;
+var EVENT_RESIZE = 'resize';
+var EVENT_TRANSITION_END = 'transitionend';
+var EVENT_WHEEL = 'wheel';
+
+// Custom events
+var EVENT_READY = 'ready';
+var EVENT_SHOW = 'show';
+var EVENT_SHOWN = 'shown';
+var EVENT_HIDE = 'hide';
+var EVENT_HIDDEN = 'hidden';
+var EVENT_VIEW = 'view';
+var EVENT_VIEWED = 'viewed';
+var EVENT_MOVE = 'move';
+var EVENT_MOVED = 'moved';
+var EVENT_ROTATE = 'rotate';
+var EVENT_ROTATED = 'rotated';
+var EVENT_SCALE = 'scale';
+var EVENT_SCALED = 'scaled';
+var EVENT_ZOOM = 'zoom';
+var EVENT_ZOOMED = 'zoomed';
+var EVENT_PLAY = 'play';
+var EVENT_STOP = 'stop';
+
+// Data keys
+var DATA_ACTION = "".concat(NAMESPACE, "Action");
+
+// RegExps
+var REGEXP_SPACES = /\s\s*/;
+
+// Misc
+var BUTTONS = ['zoom-in', 'zoom-out', 'one-to-one', 'reset', 'prev', 'play', 'next', 'rotate-left', 'rotate-right', 'flip-horizontal', 'flip-vertical'];
+
+/**
+ * Check if the given value is a string.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a string, else `false`.
+ */
+function isString(value) {
+  return typeof value === 'string';
+}
+
+/**
+ * Check if the given value is not a number.
+ */
+var isNaN = Number.isNaN || WINDOW.isNaN;
+
+/**
+ * Check if the given value is a number.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a number, else `false`.
+ */
+function isNumber(value) {
+  return typeof value === 'number' && !isNaN(value);
+}
+
+/**
+ * Check if the given value is undefined.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is undefined, else `false`.
+ */
+function isUndefined(value) {
+  return typeof value === 'undefined';
+}
+
+/**
+ * Check if the given value is an object.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is an object, else `false`.
+ */
+function isObject(value) {
+  return _typeof(value) === 'object' && value !== null;
+}
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+
+/**
+ * Check if the given value is a plain object.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a plain object, else `false`.
+ */
+function isPlainObject(value) {
+  if (!isObject(value)) {
+    return false;
+  }
+  try {
+    var _constructor = value.constructor;
+    var prototype = _constructor.prototype;
+    return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
+  } catch (error) {
+    return false;
+  }
+}
+
+/**
+ * Check if the given value is a function.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a function, else `false`.
+ */
+function isFunction(value) {
+  return typeof value === 'function';
+}
+
+/**
+ * Iterate the given data.
+ * @param {*} data - The data to iterate.
+ * @param {Function} callback - The process function for each element.
+ * @returns {*} The original data.
+ */
+function forEach(data, callback) {
+  if (data && isFunction(callback)) {
+    if (Array.isArray(data) || isNumber(data.length) /* array-like */) {
+      var length = data.length;
+      var i;
+      for (i = 0; i < length; i += 1) {
+        if (callback.call(data, data[i], i, data) === false) {
+          break;
+        }
+      }
+    } else if (isObject(data)) {
+      Object.keys(data).forEach(function (key) {
+        callback.call(data, data[key], key, data);
+      });
+    }
+  }
+  return data;
+}
+
+/**
+ * Extend the given object.
+ * @param {*} obj - The object to be extended.
+ * @param {*} args - The rest objects which will be merged to the first object.
+ * @returns {Object} The extended object.
+ */
+var assign = Object.assign || function assign(obj) {
+  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+    args[_key - 1] = arguments[_key];
+  }
+  if (isObject(obj) && args.length > 0) {
+    args.forEach(function (arg) {
+      if (isObject(arg)) {
+        Object.keys(arg).forEach(function (key) {
+          obj[key] = arg[key];
+        });
+      }
+    });
+  }
+  return obj;
+};
+var REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/;
+
+/**
+ * Apply styles to the given element.
+ * @param {Element} element - The target element.
+ * @param {Object} styles - The styles for applying.
+ */
+function setStyle(element, styles) {
+  var style = element.style;
+  forEach(styles, function (value, property) {
+    if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
+      value += 'px';
+    }
+    style[property] = value;
+  });
+}
+
+/**
+ * Escape a string for using in HTML.
+ * @param {String} value - The string to escape.
+ * @returns {String} Returns the escaped string.
+ */
+function escapeHTMLEntities(value) {
+  return isString(value) ? value.replace(/&(?!amp;|quot;|#39;|lt;|gt;)/g, '&amp;').replace(/"/g, '&quot;').replace(/'/g, '&#39;').replace(/</g, '&lt;').replace(/>/g, '&gt;') : value;
+}
+
+/**
+ * Check if the given element has a special class.
+ * @param {Element} element - The element to check.
+ * @param {string} value - The class to search.
+ * @returns {boolean} Returns `true` if the special class was found.
+ */
+function hasClass(element, value) {
+  if (!element || !value) {
+    return false;
+  }
+  return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1;
+}
+
+/**
+ * Add classes to the given element.
+ * @param {Element} element - The target element.
+ * @param {string} value - The classes to be added.
+ */
+function addClass(element, value) {
+  if (!element || !value) {
+    return;
+  }
+  if (isNumber(element.length)) {
+    forEach(element, function (elem) {
+      addClass(elem, value);
+    });
+    return;
+  }
+  if (element.classList) {
+    element.classList.add(value);
+    return;
+  }
+  var className = element.className.trim();
+  if (!className) {
+    element.className = value;
+  } else if (className.indexOf(value) < 0) {
+    element.className = "".concat(className, " ").concat(value);
+  }
+}
+
+/**
+ * Remove classes from the given element.
+ * @param {Element} element - The target element.
+ * @param {string} value - The classes to be removed.
+ */
+function removeClass(element, value) {
+  if (!element || !value) {
+    return;
+  }
+  if (isNumber(element.length)) {
+    forEach(element, function (elem) {
+      removeClass(elem, value);
+    });
+    return;
+  }
+  if (element.classList) {
+    element.classList.remove(value);
+    return;
+  }
+  if (element.className.indexOf(value) >= 0) {
+    element.className = element.className.replace(value, '');
+  }
+}
+
+/**
+ * Add or remove classes from the given element.
+ * @param {Element} element - The target element.
+ * @param {string} value - The classes to be toggled.
+ * @param {boolean} added - Add only.
+ */
+function toggleClass(element, value, added) {
+  if (!value) {
+    return;
+  }
+  if (isNumber(element.length)) {
+    forEach(element, function (elem) {
+      toggleClass(elem, value, added);
+    });
+    return;
+  }
+
+  // IE10-11 doesn't support the second parameter of `classList.toggle`
+  if (added) {
+    addClass(element, value);
+  } else {
+    removeClass(element, value);
+  }
+}
+var REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;
+
+/**
+ * Transform the given string from camelCase to kebab-case
+ * @param {string} value - The value to transform.
+ * @returns {string} The transformed value.
+ */
+function hyphenate(value) {
+  return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
+}
+
+/**
+ * Get data from the given element.
+ * @param {Element} element - The target element.
+ * @param {string} name - The data key to get.
+ * @returns {string} The data value.
+ */
+function getData(element, name) {
+  if (isObject(element[name])) {
+    return element[name];
+  }
+  if (element.dataset) {
+    return element.dataset[name];
+  }
+  return element.getAttribute("data-".concat(hyphenate(name)));
+}
+
+/**
+ * Set data to the given element.
+ * @param {Element} element - The target element.
+ * @param {string} name - The data key to set.
+ * @param {string} data - The data value.
+ */
+function setData(element, name, data) {
+  if (isObject(data)) {
+    element[name] = data;
+  } else if (element.dataset) {
+    element.dataset[name] = data;
+  } else {
+    element.setAttribute("data-".concat(hyphenate(name)), data);
+  }
+}
+var onceSupported = function () {
+  var supported = false;
+  if (IS_BROWSER) {
+    var once = false;
+    var listener = function listener() {};
+    var options = Object.defineProperty({}, 'once', {
+      get: function get() {
+        supported = true;
+        return once;
+      },
+      /**
+       * This setter can fix a `TypeError` in strict mode
+       * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only}
+       * @param {boolean} value - The value to set
+       */
+      set: function set(value) {
+        once = value;
+      }
+    });
+    WINDOW.addEventListener('test', listener, options);
+    WINDOW.removeEventListener('test', listener, options);
+  }
+  return supported;
+}();
+
+/**
+ * Remove event listener from the target element.
+ * @param {Element} element - The event target.
+ * @param {string} type - The event type(s).
+ * @param {Function} listener - The event listener.
+ * @param {Object} options - The event options.
+ */
+function removeListener(element, type, listener) {
+  var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
+  var handler = listener;
+  type.trim().split(REGEXP_SPACES).forEach(function (event) {
+    if (!onceSupported) {
+      var listeners = element.listeners;
+      if (listeners && listeners[event] && listeners[event][listener]) {
+        handler = listeners[event][listener];
+        delete listeners[event][listener];
+        if (Object.keys(listeners[event]).length === 0) {
+          delete listeners[event];
+        }
+        if (Object.keys(listeners).length === 0) {
+          delete element.listeners;
+        }
+      }
+    }
+    element.removeEventListener(event, handler, options);
+  });
+}
+
+/**
+ * Add event listener to the target element.
+ * @param {Element} element - The event target.
+ * @param {string} type - The event type(s).
+ * @param {Function} listener - The event listener.
+ * @param {Object} options - The event options.
+ */
+function addListener(element, type, listener) {
+  var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
+  var _handler = listener;
+  type.trim().split(REGEXP_SPACES).forEach(function (event) {
+    if (options.once && !onceSupported) {
+      var _element$listeners = element.listeners,
+        listeners = _element$listeners === void 0 ? {} : _element$listeners;
+      _handler = function handler() {
+        delete listeners[event][listener];
+        element.removeEventListener(event, _handler, options);
+        for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+          args[_key2] = arguments[_key2];
+        }
+        listener.apply(element, args);
+      };
+      if (!listeners[event]) {
+        listeners[event] = {};
+      }
+      if (listeners[event][listener]) {
+        element.removeEventListener(event, listeners[event][listener], options);
+      }
+      listeners[event][listener] = _handler;
+      element.listeners = listeners;
+    }
+    element.addEventListener(event, _handler, options);
+  });
+}
+
+/**
+ * Dispatch event on the target element.
+ * @param {Element} element - The event target.
+ * @param {string} type - The event type(s).
+ * @param {Object} data - The additional event data.
+ * @param {Object} options - The additional event options.
+ * @returns {boolean} Indicate if the event is default prevented or not.
+ */
+function dispatchEvent(element, type, data, options) {
+  var event;
+
+  // Event and CustomEvent on IE9-11 are global objects, not constructors
+  if (isFunction(Event) && isFunction(CustomEvent)) {
+    event = new CustomEvent(type, _objectSpread2({
+      bubbles: true,
+      cancelable: true,
+      detail: data
+    }, options));
+  } else {
+    event = document.createEvent('CustomEvent');
+    event.initCustomEvent(type, true, true, data);
+  }
+  return element.dispatchEvent(event);
+}
+
+/**
+ * Get the offset base on the document.
+ * @param {Element} element - The target element.
+ * @returns {Object} The offset data.
+ */
+function getOffset(element) {
+  var box = element.getBoundingClientRect();
+  return {
+    left: box.left + (window.pageXOffset - document.documentElement.clientLeft),
+    top: box.top + (window.pageYOffset - document.documentElement.clientTop)
+  };
+}
+
+/**
+ * Get transforms base on the given object.
+ * @param {Object} obj - The target object.
+ * @returns {string} A string contains transform values.
+ */
+function getTransforms(_ref) {
+  var rotate = _ref.rotate,
+    scaleX = _ref.scaleX,
+    scaleY = _ref.scaleY,
+    translateX = _ref.translateX,
+    translateY = _ref.translateY;
+  var values = [];
+  if (isNumber(translateX) && translateX !== 0) {
+    values.push("translateX(".concat(translateX, "px)"));
+  }
+  if (isNumber(translateY) && translateY !== 0) {
+    values.push("translateY(".concat(translateY, "px)"));
+  }
+
+  // Rotate should come first before scale to match orientation transform
+  if (isNumber(rotate) && rotate !== 0) {
+    values.push("rotate(".concat(rotate, "deg)"));
+  }
+  if (isNumber(scaleX) && scaleX !== 1) {
+    values.push("scaleX(".concat(scaleX, ")"));
+  }
+  if (isNumber(scaleY) && scaleY !== 1) {
+    values.push("scaleY(".concat(scaleY, ")"));
+  }
+  var transform = values.length ? values.join(' ') : 'none';
+  return {
+    WebkitTransform: transform,
+    msTransform: transform,
+    transform: transform
+  };
+}
+
+/**
+ * Get an image name from an image url.
+ * @param {string} url - The target url.
+ * @example
+ * // picture.jpg
+ * getImageNameFromURL('https://domain.com/path/to/picture.jpg?size=1280×960')
+ * @returns {string} A string contains the image name.
+ */
+function getImageNameFromURL(url) {
+  return isString(url) ? decodeURIComponent(url.replace(/^.*\//, '').replace(/[?&#].*$/, '')) : '';
+}
+var IS_SAFARI = WINDOW.navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(WINDOW.navigator.userAgent);
+
+/**
+ * Get an image's natural sizes.
+ * @param {string} image - The target image.
+ * @param {Object} options - The viewer options.
+ * @param {Function} callback - The callback function.
+ * @returns {HTMLImageElement} The new image.
+ */
+function getImageNaturalSizes(image, options, callback) {
+  var newImage = document.createElement('img');
+
+  // Modern browsers (except Safari)
+  if (image.naturalWidth && !IS_SAFARI) {
+    callback(image.naturalWidth, image.naturalHeight);
+    return newImage;
+  }
+  var body = document.body || document.documentElement;
+  newImage.onload = function () {
+    callback(newImage.width, newImage.height);
+    if (!IS_SAFARI) {
+      body.removeChild(newImage);
+    }
+  };
+  forEach(options.inheritedAttributes, function (name) {
+    var value = image.getAttribute(name);
+    if (value !== null) {
+      newImage.setAttribute(name, value);
+    }
+  });
+  newImage.src = image.src;
+
+  // iOS Safari will convert the image automatically
+  // with its orientation once append it into DOM
+  if (!IS_SAFARI) {
+    newImage.style.cssText = 'left:0;' + 'max-height:none!important;' + 'max-width:none!important;' + 'min-height:0!important;' + 'min-width:0!important;' + 'opacity:0;' + 'position:absolute;' + 'top:0;' + 'z-index:-1;';
+    body.appendChild(newImage);
+  }
+  return newImage;
+}
+
+/**
+ * Get the related class name of a responsive type number.
+ * @param {string} type - The responsive type.
+ * @returns {string} The related class name.
+ */
+function getResponsiveClass(type) {
+  switch (type) {
+    case 2:
+      return CLASS_HIDE_XS_DOWN;
+    case 3:
+      return CLASS_HIDE_SM_DOWN;
+    case 4:
+      return CLASS_HIDE_MD_DOWN;
+    default:
+      return '';
+  }
+}
+
+/**
+ * Get the max ratio of a group of pointers.
+ * @param {string} pointers - The target pointers.
+ * @returns {number} The result ratio.
+ */
+function getMaxZoomRatio(pointers) {
+  var pointers2 = _objectSpread2({}, pointers);
+  var ratios = [];
+  forEach(pointers, function (pointer, pointerId) {
+    delete pointers2[pointerId];
+    forEach(pointers2, function (pointer2) {
+      var x1 = Math.abs(pointer.startX - pointer2.startX);
+      var y1 = Math.abs(pointer.startY - pointer2.startY);
+      var x2 = Math.abs(pointer.endX - pointer2.endX);
+      var y2 = Math.abs(pointer.endY - pointer2.endY);
+      var z1 = Math.sqrt(x1 * x1 + y1 * y1);
+      var z2 = Math.sqrt(x2 * x2 + y2 * y2);
+      var ratio = (z2 - z1) / z1;
+      ratios.push(ratio);
+    });
+  });
+  ratios.sort(function (a, b) {
+    return Math.abs(a) < Math.abs(b);
+  });
+  return ratios[0];
+}
+
+/**
+ * Get a pointer from an event object.
+ * @param {Object} event - The target event object.
+ * @param {boolean} endOnly - Indicates if only returns the end point coordinate or not.
+ * @returns {Object} The result pointer contains start and/or end point coordinates.
+ */
+function getPointer(_ref2, endOnly) {
+  var pageX = _ref2.pageX,
+    pageY = _ref2.pageY;
+  var end = {
+    endX: pageX,
+    endY: pageY
+  };
+  return endOnly ? end : _objectSpread2({
+    timeStamp: Date.now(),
+    startX: pageX,
+    startY: pageY
+  }, end);
+}
+
+/**
+ * Get the center point coordinate of a group of pointers.
+ * @param {Object} pointers - The target pointers.
+ * @returns {Object} The center point coordinate.
+ */
+function getPointersCenter(pointers) {
+  var pageX = 0;
+  var pageY = 0;
+  var count = 0;
+  forEach(pointers, function (_ref3) {
+    var startX = _ref3.startX,
+      startY = _ref3.startY;
+    pageX += startX;
+    pageY += startY;
+    count += 1;
+  });
+  pageX /= count;
+  pageY /= count;
+  return {
+    pageX: pageX,
+    pageY: pageY
+  };
+}
+
+var render = {
+  render: function render() {
+    this.initContainer();
+    this.initViewer();
+    this.initList();
+    this.renderViewer();
+  },
+  initBody: function initBody() {
+    var ownerDocument = this.element.ownerDocument;
+    var body = ownerDocument.body || ownerDocument.documentElement;
+    this.body = body;
+    this.scrollbarWidth = window.innerWidth - ownerDocument.documentElement.clientWidth;
+    this.initialBodyPaddingRight = body.style.paddingRight;
+    this.initialBodyComputedPaddingRight = window.getComputedStyle(body).paddingRight;
+  },
+  initContainer: function initContainer() {
+    this.containerData = {
+      width: window.innerWidth,
+      height: window.innerHeight
+    };
+  },
+  initViewer: function initViewer() {
+    var options = this.options,
+      parent = this.parent;
+    var viewerData;
+    if (options.inline) {
+      viewerData = {
+        width: Math.max(parent.offsetWidth, options.minWidth),
+        height: Math.max(parent.offsetHeight, options.minHeight)
+      };
+      this.parentData = viewerData;
+    }
+    if (this.fulled || !viewerData) {
+      viewerData = this.containerData;
+    }
+    this.viewerData = assign({}, viewerData);
+  },
+  renderViewer: function renderViewer() {
+    if (this.options.inline && !this.fulled) {
+      setStyle(this.viewer, this.viewerData);
+    }
+  },
+  initList: function initList() {
+    var _this = this;
+    var element = this.element,
+      options = this.options,
+      list = this.list;
+    var items = [];
+
+    // initList may be called in this.update, so should keep idempotent
+    list.innerHTML = '';
+    forEach(this.images, function (image, index) {
+      var src = image.src;
+      var alt = image.alt || getImageNameFromURL(src);
+      var url = _this.getImageURL(image);
+      if (src || url) {
+        var item = document.createElement('li');
+        var img = document.createElement('img');
+        forEach(options.inheritedAttributes, function (name) {
+          var value = image.getAttribute(name);
+          if (value !== null) {
+            img.setAttribute(name, value);
+          }
+        });
+        if (options.navbar) {
+          img.src = src || url;
+        }
+        img.alt = alt;
+        img.setAttribute('data-original-url', url || src);
+        item.setAttribute('data-index', index);
+        item.setAttribute('data-viewer-action', 'view');
+        item.setAttribute('role', 'button');
+        if (options.keyboard) {
+          item.setAttribute('tabindex', 0);
+        }
+        item.appendChild(img);
+        list.appendChild(item);
+        items.push(item);
+      }
+    });
+    this.items = items;
+    forEach(items, function (item) {
+      var image = item.firstElementChild;
+      var onLoad;
+      var onError;
+      setData(image, 'filled', true);
+      if (options.loading) {
+        addClass(item, CLASS_LOADING);
+      }
+      addListener(image, EVENT_LOAD, onLoad = function onLoad(event) {
+        removeListener(image, EVENT_ERROR, onError);
+        if (options.loading) {
+          removeClass(item, CLASS_LOADING);
+        }
+        _this.loadImage(event);
+      }, {
+        once: true
+      });
+      addListener(image, EVENT_ERROR, onError = function onError() {
+        removeListener(image, EVENT_LOAD, onLoad);
+        if (options.loading) {
+          removeClass(item, CLASS_LOADING);
+        }
+      }, {
+        once: true
+      });
+    });
+    if (options.transition) {
+      addListener(element, EVENT_VIEWED, function () {
+        addClass(list, CLASS_TRANSITION);
+      }, {
+        once: true
+      });
+    }
+  },
+  renderList: function renderList() {
+    var index = this.index;
+    var item = this.items[index];
+    if (!item) {
+      return;
+    }
+    var next = item.nextElementSibling;
+    var gutter = parseInt(window.getComputedStyle(next || item).marginLeft, 10);
+    var offsetWidth = item.offsetWidth;
+    var outerWidth = offsetWidth + gutter;
+
+    // Place the active item in the center of the screen
+    setStyle(this.list, assign({
+      width: outerWidth * this.length - gutter
+    }, getTransforms({
+      translateX: (this.viewerData.width - offsetWidth) / 2 - outerWidth * index
+    })));
+  },
+  resetList: function resetList() {
+    var list = this.list;
+    list.innerHTML = '';
+    removeClass(list, CLASS_TRANSITION);
+    setStyle(list, getTransforms({
+      translateX: 0
+    }));
+  },
+  initImage: function initImage(done) {
+    var _this2 = this;
+    var options = this.options,
+      image = this.image,
+      viewerData = this.viewerData;
+    var footerHeight = this.footer.offsetHeight;
+    var viewerWidth = viewerData.width;
+    var viewerHeight = Math.max(viewerData.height - footerHeight, footerHeight);
+    var oldImageData = this.imageData || {};
+    var sizingImage;
+    this.imageInitializing = {
+      abort: function abort() {
+        sizingImage.onload = null;
+      }
+    };
+    sizingImage = getImageNaturalSizes(image, options, function (naturalWidth, naturalHeight) {
+      var aspectRatio = naturalWidth / naturalHeight;
+      var initialCoverage = Math.max(0, Math.min(1, options.initialCoverage));
+      var width = viewerWidth;
+      var height = viewerHeight;
+      _this2.imageInitializing = false;
+      if (viewerHeight * aspectRatio > viewerWidth) {
+        height = viewerWidth / aspectRatio;
+      } else {
+        width = viewerHeight * aspectRatio;
+      }
+      initialCoverage = isNumber(initialCoverage) ? initialCoverage : 0.9;
+      width = Math.min(width * initialCoverage, naturalWidth);
+      height = Math.min(height * initialCoverage, naturalHeight);
+      var left = (viewerWidth - width) / 2;
+      var top = (viewerHeight - height) / 2;
+      var imageData = {
+        left: left,
+        top: top,
+        x: left,
+        y: top,
+        width: width,
+        height: height,
+        oldRatio: 1,
+        ratio: width / naturalWidth,
+        aspectRatio: aspectRatio,
+        naturalWidth: naturalWidth,
+        naturalHeight: naturalHeight
+      };
+      var initialImageData = assign({}, imageData);
+      if (options.rotatable) {
+        imageData.rotate = oldImageData.rotate || 0;
+        initialImageData.rotate = 0;
+      }
+      if (options.scalable) {
+        imageData.scaleX = oldImageData.scaleX || 1;
+        imageData.scaleY = oldImageData.scaleY || 1;
+        initialImageData.scaleX = 1;
+        initialImageData.scaleY = 1;
+      }
+      _this2.imageData = imageData;
+      _this2.initialImageData = initialImageData;
+      if (done) {
+        done();
+      }
+    });
+  },
+  renderImage: function renderImage(done) {
+    var _this3 = this;
+    var image = this.image,
+      imageData = this.imageData;
+    setStyle(image, assign({
+      width: imageData.width,
+      height: imageData.height,
+      // XXX: Not to use translateX/Y to avoid image shaking when zooming
+      marginLeft: imageData.x,
+      marginTop: imageData.y
+    }, getTransforms(imageData)));
+    if (done) {
+      if ((this.viewing || this.moving || this.rotating || this.scaling || this.zooming) && this.options.transition && hasClass(image, CLASS_TRANSITION)) {
+        var onTransitionEnd = function onTransitionEnd() {
+          _this3.imageRendering = false;
+          done();
+        };
+        this.imageRendering = {
+          abort: function abort() {
+            removeListener(image, EVENT_TRANSITION_END, onTransitionEnd);
+          }
+        };
+        addListener(image, EVENT_TRANSITION_END, onTransitionEnd, {
+          once: true
+        });
+      } else {
+        done();
+      }
+    }
+  },
+  resetImage: function resetImage() {
+    // this.image only defined after viewed
+    if (this.viewing || this.viewed) {
+      var image = this.image;
+      if (this.viewing) {
+        this.viewing.abort();
+      }
+      image.parentNode.removeChild(image);
+      this.image = null;
+    }
+  }
+};
+
+var events = {
+  bind: function bind() {
+    var options = this.options,
+      viewer = this.viewer,
+      canvas = this.canvas;
+    var document = this.element.ownerDocument;
+    addListener(viewer, EVENT_CLICK, this.onClick = this.click.bind(this));
+    addListener(viewer, EVENT_DRAG_START, this.onDragStart = this.dragstart.bind(this));
+    addListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown = this.pointerdown.bind(this));
+    addListener(document, EVENT_POINTER_MOVE, this.onPointerMove = this.pointermove.bind(this));
+    addListener(document, EVENT_POINTER_UP, this.onPointerUp = this.pointerup.bind(this));
+    addListener(document, EVENT_KEY_DOWN, this.onKeyDown = this.keydown.bind(this));
+    addListener(window, EVENT_RESIZE, this.onResize = this.resize.bind(this));
+    if (options.zoomable && options.zoomOnWheel) {
+      addListener(viewer, EVENT_WHEEL, this.onWheel = this.wheel.bind(this), {
+        passive: false,
+        capture: true
+      });
+    }
+    if (options.toggleOnDblclick) {
+      addListener(canvas, EVENT_DBLCLICK, this.onDblclick = this.dblclick.bind(this));
+    }
+  },
+  unbind: function unbind() {
+    var options = this.options,
+      viewer = this.viewer,
+      canvas = this.canvas;
+    var document = this.element.ownerDocument;
+    removeListener(viewer, EVENT_CLICK, this.onClick);
+    removeListener(viewer, EVENT_DRAG_START, this.onDragStart);
+    removeListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown);
+    removeListener(document, EVENT_POINTER_MOVE, this.onPointerMove);
+    removeListener(document, EVENT_POINTER_UP, this.onPointerUp);
+    removeListener(document, EVENT_KEY_DOWN, this.onKeyDown);
+    removeListener(window, EVENT_RESIZE, this.onResize);
+    if (options.zoomable && options.zoomOnWheel) {
+      removeListener(viewer, EVENT_WHEEL, this.onWheel, {
+        passive: false,
+        capture: true
+      });
+    }
+    if (options.toggleOnDblclick) {
+      removeListener(canvas, EVENT_DBLCLICK, this.onDblclick);
+    }
+  }
+};
+
+var handlers = {
+  click: function click(event) {
+    var options = this.options,
+      imageData = this.imageData;
+    var target = event.target;
+    var action = getData(target, DATA_ACTION);
+    if (!action && target.localName === 'img' && target.parentElement.localName === 'li') {
+      target = target.parentElement;
+      action = getData(target, DATA_ACTION);
+    }
+
+    // Cancel the emulated click when the native click event was triggered.
+    if (IS_TOUCH_DEVICE && event.isTrusted && target === this.canvas) {
+      clearTimeout(this.clickCanvasTimeout);
+    }
+    switch (action) {
+      case 'mix':
+        if (this.played) {
+          this.stop();
+        } else if (options.inline) {
+          if (this.fulled) {
+            this.exit();
+          } else {
+            this.full();
+          }
+        } else {
+          this.hide();
+        }
+        break;
+      case 'hide':
+        if (!this.pointerMoved) {
+          this.hide();
+        }
+        break;
+      case 'view':
+        this.view(getData(target, 'index'));
+        break;
+      case 'zoom-in':
+        this.zoom(0.1, true);
+        break;
+      case 'zoom-out':
+        this.zoom(-0.1, true);
+        break;
+      case 'one-to-one':
+        this.toggle();
+        break;
+      case 'reset':
+        this.reset();
+        break;
+      case 'prev':
+        this.prev(options.loop);
+        break;
+      case 'play':
+        this.play(options.fullscreen);
+        break;
+      case 'next':
+        this.next(options.loop);
+        break;
+      case 'rotate-left':
+        this.rotate(-90);
+        break;
+      case 'rotate-right':
+        this.rotate(90);
+        break;
+      case 'flip-horizontal':
+        this.scaleX(-imageData.scaleX || -1);
+        break;
+      case 'flip-vertical':
+        this.scaleY(-imageData.scaleY || -1);
+        break;
+      default:
+        if (this.played) {
+          this.stop();
+        }
+    }
+  },
+  dblclick: function dblclick(event) {
+    event.preventDefault();
+    if (this.viewed && event.target === this.image) {
+      // Cancel the emulated double click when the native dblclick event was triggered.
+      if (IS_TOUCH_DEVICE && event.isTrusted) {
+        clearTimeout(this.doubleClickImageTimeout);
+      }
+
+      // XXX: No pageX/Y properties in custom event, fallback to the original event.
+      this.toggle(event.isTrusted ? event : event.detail && event.detail.originalEvent);
+    }
+  },
+  load: function load() {
+    var _this = this;
+    if (this.timeout) {
+      clearTimeout(this.timeout);
+      this.timeout = false;
+    }
+    var element = this.element,
+      options = this.options,
+      image = this.image,
+      index = this.index,
+      viewerData = this.viewerData;
+    removeClass(image, CLASS_INVISIBLE);
+    if (options.loading) {
+      removeClass(this.canvas, CLASS_LOADING);
+    }
+    image.style.cssText = 'height:0;' + "margin-left:".concat(viewerData.width / 2, "px;") + "margin-top:".concat(viewerData.height / 2, "px;") + 'max-width:none!important;' + 'position:relative;' + 'width:0;';
+    this.initImage(function () {
+      toggleClass(image, CLASS_MOVE, options.movable);
+      toggleClass(image, CLASS_TRANSITION, options.transition);
+      _this.renderImage(function () {
+        _this.viewed = true;
+        _this.viewing = false;
+        if (isFunction(options.viewed)) {
+          addListener(element, EVENT_VIEWED, options.viewed, {
+            once: true
+          });
+        }
+        dispatchEvent(element, EVENT_VIEWED, {
+          originalImage: _this.images[index],
+          index: index,
+          image: image
+        }, {
+          cancelable: false
+        });
+      });
+    });
+  },
+  loadImage: function loadImage(event) {
+    var image = event.target;
+    var parent = image.parentNode;
+    var parentWidth = parent.offsetWidth || 30;
+    var parentHeight = parent.offsetHeight || 50;
+    var filled = !!getData(image, 'filled');
+    getImageNaturalSizes(image, this.options, function (naturalWidth, naturalHeight) {
+      var aspectRatio = naturalWidth / naturalHeight;
+      var width = parentWidth;
+      var height = parentHeight;
+      if (parentHeight * aspectRatio > parentWidth) {
+        if (filled) {
+          width = parentHeight * aspectRatio;
+        } else {
+          height = parentWidth / aspectRatio;
+        }
+      } else if (filled) {
+        height = parentWidth / aspectRatio;
+      } else {
+        width = parentHeight * aspectRatio;
+      }
+      setStyle(image, assign({
+        width: width,
+        height: height
+      }, getTransforms({
+        translateX: (parentWidth - width) / 2,
+        translateY: (parentHeight - height) / 2
+      })));
+    });
+  },
+  keydown: function keydown(event) {
+    var options = this.options;
+    if (!options.keyboard) {
+      return;
+    }
+    var keyCode = event.keyCode || event.which || event.charCode;
+    switch (keyCode) {
+      // Enter
+      case 13:
+        if (this.viewer.contains(event.target)) {
+          this.click(event);
+        }
+        break;
+    }
+    if (!this.fulled) {
+      return;
+    }
+    switch (keyCode) {
+      // Escape
+      case 27:
+        if (this.played) {
+          this.stop();
+        } else if (options.inline) {
+          if (this.fulled) {
+            this.exit();
+          }
+        } else {
+          this.hide();
+        }
+        break;
+
+      // Space
+      case 32:
+        if (this.played) {
+          this.stop();
+        }
+        break;
+
+      // ArrowLeft
+      case 37:
+        if (this.played && this.playing) {
+          this.playing.prev();
+        } else {
+          this.prev(options.loop);
+        }
+        break;
+
+      // ArrowUp
+      case 38:
+        // Prevent scroll on Firefox
+        event.preventDefault();
+
+        // Zoom in
+        this.zoom(options.zoomRatio, true);
+        break;
+
+      // ArrowRight
+      case 39:
+        if (this.played && this.playing) {
+          this.playing.next();
+        } else {
+          this.next(options.loop);
+        }
+        break;
+
+      // ArrowDown
+      case 40:
+        // Prevent scroll on Firefox
+        event.preventDefault();
+
+        // Zoom out
+        this.zoom(-options.zoomRatio, true);
+        break;
+
+      // Ctrl + 0
+      case 48:
+      // Fall through
+
+      // Ctrl + 1
+      // eslint-disable-next-line no-fallthrough
+      case 49:
+        if (event.ctrlKey) {
+          event.preventDefault();
+          this.toggle();
+        }
+        break;
+    }
+  },
+  dragstart: function dragstart(event) {
+    if (event.target.localName === 'img') {
+      event.preventDefault();
+    }
+  },
+  pointerdown: function pointerdown(event) {
+    var options = this.options,
+      pointers = this.pointers;
+    var buttons = event.buttons,
+      button = event.button;
+    this.pointerMoved = false;
+    if (!this.viewed || this.showing || this.viewing || this.hiding
+
+    // Handle mouse event and pointer event and ignore touch event
+    || (event.type === 'mousedown' || event.type === 'pointerdown' && event.pointerType === 'mouse') && (
+    // No primary button (Usually the left button)
+    isNumber(buttons) && buttons !== 1 || isNumber(button) && button !== 0
+
+    // Open context menu
+    || event.ctrlKey)) {
+      return;
+    }
+
+    // Prevent default behaviours as page zooming in touch devices.
+    event.preventDefault();
+    if (event.changedTouches) {
+      forEach(event.changedTouches, function (touch) {
+        pointers[touch.identifier] = getPointer(touch);
+      });
+    } else {
+      pointers[event.pointerId || 0] = getPointer(event);
+    }
+    var action = options.movable ? ACTION_MOVE : false;
+    if (options.zoomOnTouch && options.zoomable && Object.keys(pointers).length > 1) {
+      action = ACTION_ZOOM;
+    } else if (options.slideOnTouch && (event.pointerType === 'touch' || event.type === 'touchstart') && this.isSwitchable()) {
+      action = ACTION_SWITCH;
+    }
+    if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
+      removeClass(this.image, CLASS_TRANSITION);
+    }
+    this.action = action;
+  },
+  pointermove: function pointermove(event) {
+    var pointers = this.pointers,
+      action = this.action;
+    if (!this.viewed || !action) {
+      return;
+    }
+    event.preventDefault();
+    this.pointerMoved = true;
+    if (event.changedTouches) {
+      forEach(event.changedTouches, function (touch) {
+        assign(pointers[touch.identifier] || {}, getPointer(touch, true));
+      });
+    } else {
+      assign(pointers[event.pointerId || 0] || {}, getPointer(event, true));
+    }
+    this.change(event);
+  },
+  pointerup: function pointerup(event) {
+    var _this2 = this;
+    var options = this.options,
+      action = this.action,
+      pointers = this.pointers;
+    var pointer;
+    if (event.changedTouches) {
+      forEach(event.changedTouches, function (touch) {
+        pointer = pointers[touch.identifier];
+        delete pointers[touch.identifier];
+      });
+    } else {
+      pointer = pointers[event.pointerId || 0];
+      delete pointers[event.pointerId || 0];
+    }
+    if (!action) {
+      return;
+    }
+    event.preventDefault();
+    if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
+      addClass(this.image, CLASS_TRANSITION);
+    }
+    this.action = false;
+
+    // Emulate click and double click in touch devices to support backdrop and image zooming (#210).
+    if (IS_TOUCH_DEVICE && action !== ACTION_ZOOM && pointer && Date.now() - pointer.timeStamp < 500) {
+      clearTimeout(this.clickCanvasTimeout);
+      clearTimeout(this.doubleClickImageTimeout);
+      if (options.toggleOnDblclick && this.viewed && event.target === this.image) {
+        if (this.imageClicked) {
+          this.imageClicked = false;
+
+          // This timeout will be cleared later when a native dblclick event is triggering
+          this.doubleClickImageTimeout = setTimeout(function () {
+            dispatchEvent(_this2.image, EVENT_DBLCLICK, {
+              originalEvent: event
+            });
+          }, 50);
+        } else {
+          this.imageClicked = true;
+
+          // The default timing of a double click in Windows is 500 ms
+          this.doubleClickImageTimeout = setTimeout(function () {
+            _this2.imageClicked = false;
+          }, 500);
+        }
+      } else {
+        this.imageClicked = false;
+        if (options.backdrop && options.backdrop !== 'static' && event.target === this.canvas) {
+          // This timeout will be cleared later when a native click event is triggering
+          this.clickCanvasTimeout = setTimeout(function () {
+            dispatchEvent(_this2.canvas, EVENT_CLICK, {
+              originalEvent: event
+            });
+          }, 50);
+        }
+      }
+    }
+  },
+  resize: function resize() {
+    var _this3 = this;
+    if (!this.isShown || this.hiding) {
+      return;
+    }
+    if (this.fulled) {
+      this.close();
+      this.initBody();
+      this.open();
+    }
+    this.initContainer();
+    this.initViewer();
+    this.renderViewer();
+    this.renderList();
+    if (this.viewed) {
+      this.initImage(function () {
+        _this3.renderImage();
+      });
+    }
+    if (this.played) {
+      if (this.options.fullscreen && this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+        this.stop();
+        return;
+      }
+      forEach(this.player.getElementsByTagName('img'), function (image) {
+        addListener(image, EVENT_LOAD, _this3.loadImage.bind(_this3), {
+          once: true
+        });
+        dispatchEvent(image, EVENT_LOAD);
+      });
+    }
+  },
+  wheel: function wheel(event) {
+    var _this4 = this;
+    if (!this.viewed) {
+      return;
+    }
+    event.preventDefault();
+
+    // Limit wheel speed to prevent zoom too fast
+    if (this.wheeling) {
+      return;
+    }
+    this.wheeling = true;
+    setTimeout(function () {
+      _this4.wheeling = false;
+    }, 50);
+    var ratio = Number(this.options.zoomRatio) || 0.1;
+    var delta = 1;
+    if (event.deltaY) {
+      delta = event.deltaY > 0 ? 1 : -1;
+    } else if (event.wheelDelta) {
+      delta = -event.wheelDelta / 120;
+    } else if (event.detail) {
+      delta = event.detail > 0 ? 1 : -1;
+    }
+    this.zoom(-delta * ratio, true, null, event);
+  }
+};
+
+var methods = {
+  /** Show the viewer (only available in modal mode)
+   * @param {boolean} [immediate=false] - Indicates if show the viewer immediately or not.
+   * @returns {Viewer} this
+   */
+  show: function show() {
+    var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+    var element = this.element,
+      options = this.options;
+    if (options.inline || this.showing || this.isShown || this.showing) {
+      return this;
+    }
+    if (!this.ready) {
+      this.build();
+      if (this.ready) {
+        this.show(immediate);
+      }
+      return this;
+    }
+    if (isFunction(options.show)) {
+      addListener(element, EVENT_SHOW, options.show, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_SHOW) === false || !this.ready) {
+      return this;
+    }
+    if (this.hiding) {
+      this.transitioning.abort();
+    }
+    this.showing = true;
+    this.open();
+    var viewer = this.viewer;
+    removeClass(viewer, CLASS_HIDE);
+    viewer.setAttribute('role', 'dialog');
+    viewer.setAttribute('aria-labelledby', this.title.id);
+    viewer.setAttribute('aria-modal', true);
+    viewer.removeAttribute('aria-hidden');
+    if (options.transition && !immediate) {
+      var shown = this.shown.bind(this);
+      this.transitioning = {
+        abort: function abort() {
+          removeListener(viewer, EVENT_TRANSITION_END, shown);
+          removeClass(viewer, CLASS_IN);
+        }
+      };
+      addClass(viewer, CLASS_TRANSITION);
+
+      // Force reflow to enable CSS3 transition
+      viewer.initialOffsetWidth = viewer.offsetWidth;
+      addListener(viewer, EVENT_TRANSITION_END, shown, {
+        once: true
+      });
+      addClass(viewer, CLASS_IN);
+    } else {
+      addClass(viewer, CLASS_IN);
+      this.shown();
+    }
+    return this;
+  },
+  /**
+   * Hide the viewer (only available in modal mode)
+   * @param {boolean} [immediate=false] - Indicates if hide the viewer immediately or not.
+   * @returns {Viewer} this
+   */
+  hide: function hide() {
+    var _this = this;
+    var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+    var element = this.element,
+      options = this.options;
+    if (options.inline || this.hiding || !(this.isShown || this.showing)) {
+      return this;
+    }
+    if (isFunction(options.hide)) {
+      addListener(element, EVENT_HIDE, options.hide, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_HIDE) === false) {
+      return this;
+    }
+    if (this.showing) {
+      this.transitioning.abort();
+    }
+    this.hiding = true;
+    if (this.played) {
+      this.stop();
+    } else if (this.viewing) {
+      this.viewing.abort();
+    }
+    var viewer = this.viewer,
+      image = this.image;
+    var hideImmediately = function hideImmediately() {
+      removeClass(viewer, CLASS_IN);
+      _this.hidden();
+    };
+    if (options.transition && !immediate) {
+      var onViewerTransitionEnd = function onViewerTransitionEnd(event) {
+        // Ignore all propagating `transitionend` events (#275).
+        if (event && event.target === viewer) {
+          removeListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
+          _this.hidden();
+        }
+      };
+      var onImageTransitionEnd = function onImageTransitionEnd() {
+        // In case of show the viewer by `viewer.show(true)` previously (#407).
+        if (hasClass(viewer, CLASS_TRANSITION)) {
+          addListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
+          removeClass(viewer, CLASS_IN);
+        } else {
+          hideImmediately();
+        }
+      };
+      this.transitioning = {
+        abort: function abort() {
+          if (_this.viewed && hasClass(image, CLASS_TRANSITION)) {
+            removeListener(image, EVENT_TRANSITION_END, onImageTransitionEnd);
+          } else if (hasClass(viewer, CLASS_TRANSITION)) {
+            removeListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
+          }
+        }
+      };
+
+      // In case of hiding the viewer when holding on the image (#255),
+      // note that the `CLASS_TRANSITION` class will be removed on pointer down.
+      if (this.viewed && hasClass(image, CLASS_TRANSITION)) {
+        addListener(image, EVENT_TRANSITION_END, onImageTransitionEnd, {
+          once: true
+        });
+        this.zoomTo(0, false, null, null, true);
+      } else {
+        onImageTransitionEnd();
+      }
+    } else {
+      hideImmediately();
+    }
+    return this;
+  },
+  /**
+   * View one of the images with image's index
+   * @param {number} index - The index of the image to view.
+   * @returns {Viewer} this
+   */
+  view: function view() {
+    var _this2 = this;
+    var index = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.options.initialViewIndex;
+    index = Number(index) || 0;
+    if (this.hiding || this.played || index < 0 || index >= this.length || this.viewed && index === this.index) {
+      return this;
+    }
+    if (!this.isShown) {
+      this.index = index;
+      return this.show();
+    }
+    if (this.viewing) {
+      this.viewing.abort();
+    }
+    var element = this.element,
+      options = this.options,
+      title = this.title,
+      canvas = this.canvas;
+    var item = this.items[index];
+    var img = item.querySelector('img');
+    var url = getData(img, 'originalUrl');
+    var alt = img.getAttribute('alt');
+    var image = document.createElement('img');
+    forEach(options.inheritedAttributes, function (name) {
+      var value = img.getAttribute(name);
+      if (value !== null) {
+        image.setAttribute(name, value);
+      }
+    });
+    image.src = url;
+    image.alt = alt;
+    if (isFunction(options.view)) {
+      addListener(element, EVENT_VIEW, options.view, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_VIEW, {
+      originalImage: this.images[index],
+      index: index,
+      image: image
+    }) === false || !this.isShown || this.hiding || this.played) {
+      return this;
+    }
+    var activeItem = this.items[this.index];
+    if (activeItem) {
+      removeClass(activeItem, CLASS_ACTIVE);
+      activeItem.removeAttribute('aria-selected');
+    }
+    addClass(item, CLASS_ACTIVE);
+    item.setAttribute('aria-selected', true);
+    if (options.focus) {
+      item.focus();
+    }
+    this.image = image;
+    this.viewed = false;
+    this.index = index;
+    this.imageData = {};
+    addClass(image, CLASS_INVISIBLE);
+    if (options.loading) {
+      addClass(canvas, CLASS_LOADING);
+    }
+    canvas.innerHTML = '';
+    canvas.appendChild(image);
+
+    // Center current item
+    this.renderList();
+
+    // Clear title
+    title.innerHTML = '';
+
+    // Generate title after viewed
+    var onViewed = function onViewed() {
+      var imageData = _this2.imageData;
+      var render = Array.isArray(options.title) ? options.title[1] : options.title;
+      title.innerHTML = escapeHTMLEntities(isFunction(render) ? render.call(_this2, image, imageData) : "".concat(alt, " (").concat(imageData.naturalWidth, " \xD7 ").concat(imageData.naturalHeight, ")"));
+    };
+    var onLoad;
+    var onError;
+    addListener(element, EVENT_VIEWED, onViewed, {
+      once: true
+    });
+    this.viewing = {
+      abort: function abort() {
+        removeListener(element, EVENT_VIEWED, onViewed);
+        if (image.complete) {
+          if (_this2.imageRendering) {
+            _this2.imageRendering.abort();
+          } else if (_this2.imageInitializing) {
+            _this2.imageInitializing.abort();
+          }
+        } else {
+          // Cancel download to save bandwidth.
+          image.src = '';
+          removeListener(image, EVENT_LOAD, onLoad);
+          if (_this2.timeout) {
+            clearTimeout(_this2.timeout);
+          }
+        }
+      }
+    };
+    if (image.complete) {
+      this.load();
+    } else {
+      addListener(image, EVENT_LOAD, onLoad = function onLoad() {
+        removeListener(image, EVENT_ERROR, onError);
+        _this2.load();
+      }, {
+        once: true
+      });
+      addListener(image, EVENT_ERROR, onError = function onError() {
+        removeListener(image, EVENT_LOAD, onLoad);
+        if (_this2.timeout) {
+          clearTimeout(_this2.timeout);
+          _this2.timeout = false;
+        }
+        removeClass(image, CLASS_INVISIBLE);
+        if (options.loading) {
+          removeClass(_this2.canvas, CLASS_LOADING);
+        }
+      }, {
+        once: true
+      });
+      if (this.timeout) {
+        clearTimeout(this.timeout);
+      }
+
+      // Make the image visible if it fails to load within 1s
+      this.timeout = setTimeout(function () {
+        removeClass(image, CLASS_INVISIBLE);
+        _this2.timeout = false;
+      }, 1000);
+    }
+    return this;
+  },
+  /**
+   * View the previous image
+   * @param {boolean} [loop=false] - Indicate if view the last one
+   * when it is the first one at present.
+   * @returns {Viewer} this
+   */
+  prev: function prev() {
+    var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+    var index = this.index - 1;
+    if (index < 0) {
+      index = loop ? this.length - 1 : 0;
+    }
+    this.view(index);
+    return this;
+  },
+  /**
+   * View the next image
+   * @param {boolean} [loop=false] - Indicate if view the first one
+   * when it is the last one at present.
+   * @returns {Viewer} this
+   */
+  next: function next() {
+    var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+    var maxIndex = this.length - 1;
+    var index = this.index + 1;
+    if (index > maxIndex) {
+      index = loop ? 0 : maxIndex;
+    }
+    this.view(index);
+    return this;
+  },
+  /**
+   * Move the image with relative offsets.
+   * @param {number} x - The moving distance in the horizontal direction.
+   * @param {number} [y=x] The moving distance in the vertical direction.
+   * @returns {Viewer} this
+   */
+  move: function move(x) {
+    var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
+    var imageData = this.imageData;
+    this.moveTo(isUndefined(x) ? x : imageData.x + Number(x), isUndefined(y) ? y : imageData.y + Number(y));
+    return this;
+  },
+  /**
+   * Move the image to an absolute point.
+   * @param {number} x - The new position in the horizontal direction.
+   * @param {number} [y=x] - The new position in the vertical direction.
+   * @param {Event} [_originalEvent=null] - The original event if any.
+   * @returns {Viewer} this
+   */
+  moveTo: function moveTo(x) {
+    var _this3 = this;
+    var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
+    var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+    var element = this.element,
+      options = this.options,
+      imageData = this.imageData;
+    x = Number(x);
+    y = Number(y);
+    if (this.viewed && !this.played && options.movable) {
+      var oldX = imageData.x;
+      var oldY = imageData.y;
+      var changed = false;
+      if (isNumber(x)) {
+        changed = true;
+      } else {
+        x = oldX;
+      }
+      if (isNumber(y)) {
+        changed = true;
+      } else {
+        y = oldY;
+      }
+      if (changed) {
+        if (isFunction(options.move)) {
+          addListener(element, EVENT_MOVE, options.move, {
+            once: true
+          });
+        }
+        if (dispatchEvent(element, EVENT_MOVE, {
+          x: x,
+          y: y,
+          oldX: oldX,
+          oldY: oldY,
+          originalEvent: _originalEvent
+        }) === false) {
+          return this;
+        }
+        imageData.x = x;
+        imageData.y = y;
+        imageData.left = x;
+        imageData.top = y;
+        this.moving = true;
+        this.renderImage(function () {
+          _this3.moving = false;
+          if (isFunction(options.moved)) {
+            addListener(element, EVENT_MOVED, options.moved, {
+              once: true
+            });
+          }
+          dispatchEvent(element, EVENT_MOVED, {
+            x: x,
+            y: y,
+            oldX: oldX,
+            oldY: oldY,
+            originalEvent: _originalEvent
+          }, {
+            cancelable: false
+          });
+        });
+      }
+    }
+    return this;
+  },
+  /**
+   * Rotate the image with a relative degree.
+   * @param {number} degree - The rotate degree.
+   * @returns {Viewer} this
+   */
+  rotate: function rotate(degree) {
+    this.rotateTo((this.imageData.rotate || 0) + Number(degree));
+    return this;
+  },
+  /**
+   * Rotate the image to an absolute degree.
+   * @param {number} degree - The rotate degree.
+   * @returns {Viewer} this
+   */
+  rotateTo: function rotateTo(degree) {
+    var _this4 = this;
+    var element = this.element,
+      options = this.options,
+      imageData = this.imageData;
+    degree = Number(degree);
+    if (isNumber(degree) && this.viewed && !this.played && options.rotatable) {
+      var oldDegree = imageData.rotate;
+      if (isFunction(options.rotate)) {
+        addListener(element, EVENT_ROTATE, options.rotate, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_ROTATE, {
+        degree: degree,
+        oldDegree: oldDegree
+      }) === false) {
+        return this;
+      }
+      imageData.rotate = degree;
+      this.rotating = true;
+      this.renderImage(function () {
+        _this4.rotating = false;
+        if (isFunction(options.rotated)) {
+          addListener(element, EVENT_ROTATED, options.rotated, {
+            once: true
+          });
+        }
+        dispatchEvent(element, EVENT_ROTATED, {
+          degree: degree,
+          oldDegree: oldDegree
+        }, {
+          cancelable: false
+        });
+      });
+    }
+    return this;
+  },
+  /**
+   * Scale the image on the x-axis.
+   * @param {number} scaleX - The scale ratio on the x-axis.
+   * @returns {Viewer} this
+   */
+  scaleX: function scaleX(_scaleX) {
+    this.scale(_scaleX, this.imageData.scaleY);
+    return this;
+  },
+  /**
+   * Scale the image on the y-axis.
+   * @param {number} scaleY - The scale ratio on the y-axis.
+   * @returns {Viewer} this
+   */
+  scaleY: function scaleY(_scaleY) {
+    this.scale(this.imageData.scaleX, _scaleY);
+    return this;
+  },
+  /**
+   * Scale the image.
+   * @param {number} scaleX - The scale ratio on the x-axis.
+   * @param {number} [scaleY=scaleX] - The scale ratio on the y-axis.
+   * @returns {Viewer} this
+   */
+  scale: function scale(scaleX) {
+    var _this5 = this;
+    var scaleY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : scaleX;
+    var element = this.element,
+      options = this.options,
+      imageData = this.imageData;
+    scaleX = Number(scaleX);
+    scaleY = Number(scaleY);
+    if (this.viewed && !this.played && options.scalable) {
+      var oldScaleX = imageData.scaleX;
+      var oldScaleY = imageData.scaleY;
+      var changed = false;
+      if (isNumber(scaleX)) {
+        changed = true;
+      } else {
+        scaleX = oldScaleX;
+      }
+      if (isNumber(scaleY)) {
+        changed = true;
+      } else {
+        scaleY = oldScaleY;
+      }
+      if (changed) {
+        if (isFunction(options.scale)) {
+          addListener(element, EVENT_SCALE, options.scale, {
+            once: true
+          });
+        }
+        if (dispatchEvent(element, EVENT_SCALE, {
+          scaleX: scaleX,
+          scaleY: scaleY,
+          oldScaleX: oldScaleX,
+          oldScaleY: oldScaleY
+        }) === false) {
+          return this;
+        }
+        imageData.scaleX = scaleX;
+        imageData.scaleY = scaleY;
+        this.scaling = true;
+        this.renderImage(function () {
+          _this5.scaling = false;
+          if (isFunction(options.scaled)) {
+            addListener(element, EVENT_SCALED, options.scaled, {
+              once: true
+            });
+          }
+          dispatchEvent(element, EVENT_SCALED, {
+            scaleX: scaleX,
+            scaleY: scaleY,
+            oldScaleX: oldScaleX,
+            oldScaleY: oldScaleY
+          }, {
+            cancelable: false
+          });
+        });
+      }
+    }
+    return this;
+  },
+  /**
+   * Zoom the image with a relative ratio.
+   * @param {number} ratio - The target ratio.
+   * @param {boolean} [showTooltip=false] - Indicates whether to show the tooltip.
+   * @param {Object} [pivot] - The pivot point coordinate for zooming.
+   * @param {Event} [_originalEvent=null] - The original event if any.
+   * @returns {Viewer} this
+   */
+  zoom: function zoom(ratio) {
+    var showTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
+    var pivot = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+    var _originalEvent = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
+    var imageData = this.imageData;
+    ratio = Number(ratio);
+    if (ratio < 0) {
+      ratio = 1 / (1 - ratio);
+    } else {
+      ratio = 1 + ratio;
+    }
+    this.zoomTo(imageData.width * ratio / imageData.naturalWidth, showTooltip, pivot, _originalEvent);
+    return this;
+  },
+  /**
+   * Zoom the image to an absolute ratio.
+   * @param {number} ratio - The target ratio.
+   * @param {boolean} [showTooltip] - Indicates whether to show the tooltip.
+   * @param {Object} [pivot] - The pivot point coordinate for zooming.
+   * @param {Event} [_originalEvent=null] - The original event if any.
+   * @param {Event} [_zoomable=false] - Indicates if the current zoom is available or not.
+   * @returns {Viewer} this
+   */
+  zoomTo: function zoomTo(ratio) {
+    var _this6 = this;
+    var showTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
+    var pivot = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+    var _originalEvent = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
+    var _zoomable = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : false;
+    var element = this.element,
+      options = this.options,
+      pointers = this.pointers,
+      imageData = this.imageData;
+    var x = imageData.x,
+      y = imageData.y,
+      width = imageData.width,
+      height = imageData.height,
+      naturalWidth = imageData.naturalWidth,
+      naturalHeight = imageData.naturalHeight;
+    ratio = Math.max(0, ratio);
+    if (isNumber(ratio) && this.viewed && !this.played && (_zoomable || options.zoomable)) {
+      if (!_zoomable) {
+        var minZoomRatio = Math.max(0.01, options.minZoomRatio);
+        var maxZoomRatio = Math.min(100, options.maxZoomRatio);
+        ratio = Math.min(Math.max(ratio, minZoomRatio), maxZoomRatio);
+      }
+      if (_originalEvent) {
+        switch (_originalEvent.type) {
+          case 'wheel':
+            if (options.zoomRatio >= 0.055 && ratio > 0.95 && ratio < 1.05) {
+              ratio = 1;
+            }
+            break;
+          case 'pointermove':
+          case 'touchmove':
+          case 'mousemove':
+            if (ratio > 0.99 && ratio < 1.01) {
+              ratio = 1;
+            }
+            break;
+        }
+      }
+      var newWidth = naturalWidth * ratio;
+      var newHeight = naturalHeight * ratio;
+      var offsetWidth = newWidth - width;
+      var offsetHeight = newHeight - height;
+      var oldRatio = imageData.ratio;
+      if (isFunction(options.zoom)) {
+        addListener(element, EVENT_ZOOM, options.zoom, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_ZOOM, {
+        ratio: ratio,
+        oldRatio: oldRatio,
+        originalEvent: _originalEvent
+      }) === false) {
+        return this;
+      }
+      this.zooming = true;
+      if (_originalEvent) {
+        var offset = getOffset(this.viewer);
+        var center = pointers && Object.keys(pointers).length > 0 ? getPointersCenter(pointers) : {
+          pageX: _originalEvent.pageX,
+          pageY: _originalEvent.pageY
+        };
+
+        // Zoom from the triggering point of the event
+        imageData.x -= offsetWidth * ((center.pageX - offset.left - x) / width);
+        imageData.y -= offsetHeight * ((center.pageY - offset.top - y) / height);
+      } else if (isPlainObject(pivot) && isNumber(pivot.x) && isNumber(pivot.y)) {
+        imageData.x -= offsetWidth * ((pivot.x - x) / width);
+        imageData.y -= offsetHeight * ((pivot.y - y) / height);
+      } else {
+        // Zoom from the center of the image
+        imageData.x -= offsetWidth / 2;
+        imageData.y -= offsetHeight / 2;
+      }
+      imageData.left = imageData.x;
+      imageData.top = imageData.y;
+      imageData.width = newWidth;
+      imageData.height = newHeight;
+      imageData.oldRatio = oldRatio;
+      imageData.ratio = ratio;
+      this.renderImage(function () {
+        _this6.zooming = false;
+        if (isFunction(options.zoomed)) {
+          addListener(element, EVENT_ZOOMED, options.zoomed, {
+            once: true
+          });
+        }
+        dispatchEvent(element, EVENT_ZOOMED, {
+          ratio: ratio,
+          oldRatio: oldRatio,
+          originalEvent: _originalEvent
+        }, {
+          cancelable: false
+        });
+      });
+      if (showTooltip) {
+        this.tooltip();
+      }
+    }
+    return this;
+  },
+  /**
+   * Play the images
+   * @param {boolean|FullscreenOptions} [fullscreen=false] - Indicate if request fullscreen or not.
+   * @returns {Viewer} this
+   */
+  play: function play() {
+    var _this7 = this;
+    var fullscreen = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+    if (!this.isShown || this.played) {
+      return this;
+    }
+    var element = this.element,
+      options = this.options;
+    if (isFunction(options.play)) {
+      addListener(element, EVENT_PLAY, options.play, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_PLAY) === false) {
+      return this;
+    }
+    var player = this.player;
+    var onLoad = this.loadImage.bind(this);
+    var list = [];
+    var total = 0;
+    var index = 0;
+    this.played = true;
+    this.onLoadWhenPlay = onLoad;
+    if (fullscreen) {
+      this.requestFullscreen(fullscreen);
+    }
+    addClass(player, CLASS_SHOW);
+    forEach(this.items, function (item, i) {
+      var img = item.querySelector('img');
+      var image = document.createElement('img');
+      image.src = getData(img, 'originalUrl');
+      image.alt = img.getAttribute('alt');
+      image.referrerPolicy = img.referrerPolicy;
+      total += 1;
+      addClass(image, CLASS_FADE);
+      toggleClass(image, CLASS_TRANSITION, options.transition);
+      if (hasClass(item, CLASS_ACTIVE)) {
+        addClass(image, CLASS_IN);
+        index = i;
+      }
+      list.push(image);
+      addListener(image, EVENT_LOAD, onLoad, {
+        once: true
+      });
+      player.appendChild(image);
+    });
+    if (isNumber(options.interval) && options.interval > 0) {
+      var prev = function prev() {
+        clearTimeout(_this7.playing.timeout);
+        removeClass(list[index], CLASS_IN);
+        index -= 1;
+        index = index >= 0 ? index : total - 1;
+        addClass(list[index], CLASS_IN);
+        _this7.playing.timeout = setTimeout(prev, options.interval);
+      };
+      var next = function next() {
+        clearTimeout(_this7.playing.timeout);
+        removeClass(list[index], CLASS_IN);
+        index += 1;
+        index = index < total ? index : 0;
+        addClass(list[index], CLASS_IN);
+        _this7.playing.timeout = setTimeout(next, options.interval);
+      };
+      if (total > 1) {
+        this.playing = {
+          prev: prev,
+          next: next,
+          timeout: setTimeout(next, options.interval)
+        };
+      }
+    }
+    return this;
+  },
+  // Stop play
+  stop: function stop() {
+    var _this8 = this;
+    if (!this.played) {
+      return this;
+    }
+    var element = this.element,
+      options = this.options;
+    if (isFunction(options.stop)) {
+      addListener(element, EVENT_STOP, options.stop, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_STOP) === false) {
+      return this;
+    }
+    var player = this.player;
+    clearTimeout(this.playing.timeout);
+    this.playing = false;
+    this.played = false;
+    forEach(player.getElementsByTagName('img'), function (image) {
+      removeListener(image, EVENT_LOAD, _this8.onLoadWhenPlay);
+    });
+    removeClass(player, CLASS_SHOW);
+    player.innerHTML = '';
+    this.exitFullscreen();
+    return this;
+  },
+  // Enter modal mode (only available in inline mode)
+  full: function full() {
+    var _this9 = this;
+    var options = this.options,
+      viewer = this.viewer,
+      image = this.image,
+      list = this.list;
+    if (!this.isShown || this.played || this.fulled || !options.inline) {
+      return this;
+    }
+    this.fulled = true;
+    this.open();
+    addClass(this.button, CLASS_FULLSCREEN_EXIT);
+    if (options.transition) {
+      removeClass(list, CLASS_TRANSITION);
+      if (this.viewed) {
+        removeClass(image, CLASS_TRANSITION);
+      }
+    }
+    addClass(viewer, CLASS_FIXED);
+    viewer.setAttribute('role', 'dialog');
+    viewer.setAttribute('aria-labelledby', this.title.id);
+    viewer.setAttribute('aria-modal', true);
+    viewer.removeAttribute('style');
+    setStyle(viewer, {
+      zIndex: options.zIndex
+    });
+    if (options.focus) {
+      this.enforceFocus();
+    }
+    this.initContainer();
+    this.viewerData = assign({}, this.containerData);
+    this.renderList();
+    if (this.viewed) {
+      this.initImage(function () {
+        _this9.renderImage(function () {
+          if (options.transition) {
+            setTimeout(function () {
+              addClass(image, CLASS_TRANSITION);
+              addClass(list, CLASS_TRANSITION);
+            }, 0);
+          }
+        });
+      });
+    }
+    return this;
+  },
+  // Exit modal mode (only available in inline mode)
+  exit: function exit() {
+    var _this10 = this;
+    var options = this.options,
+      viewer = this.viewer,
+      image = this.image,
+      list = this.list;
+    if (!this.isShown || this.played || !this.fulled || !options.inline) {
+      return this;
+    }
+    this.fulled = false;
+    this.close();
+    removeClass(this.button, CLASS_FULLSCREEN_EXIT);
+    if (options.transition) {
+      removeClass(list, CLASS_TRANSITION);
+      if (this.viewed) {
+        removeClass(image, CLASS_TRANSITION);
+      }
+    }
+    if (options.focus) {
+      this.clearEnforceFocus();
+    }
+    viewer.removeAttribute('role');
+    viewer.removeAttribute('aria-labelledby');
+    viewer.removeAttribute('aria-modal');
+    removeClass(viewer, CLASS_FIXED);
+    setStyle(viewer, {
+      zIndex: options.zIndexInline
+    });
+    this.viewerData = assign({}, this.parentData);
+    this.renderViewer();
+    this.renderList();
+    if (this.viewed) {
+      this.initImage(function () {
+        _this10.renderImage(function () {
+          if (options.transition) {
+            setTimeout(function () {
+              addClass(image, CLASS_TRANSITION);
+              addClass(list, CLASS_TRANSITION);
+            }, 0);
+          }
+        });
+      });
+    }
+    return this;
+  },
+  // Show the current ratio of the image with percentage
+  tooltip: function tooltip() {
+    var _this11 = this;
+    var options = this.options,
+      tooltipBox = this.tooltipBox,
+      imageData = this.imageData;
+    if (!this.viewed || this.played || !options.tooltip) {
+      return this;
+    }
+    tooltipBox.textContent = "".concat(Math.round(imageData.ratio * 100), "%");
+    if (!this.tooltipping) {
+      if (options.transition) {
+        if (this.fading) {
+          dispatchEvent(tooltipBox, EVENT_TRANSITION_END);
+        }
+        addClass(tooltipBox, CLASS_SHOW);
+        addClass(tooltipBox, CLASS_FADE);
+        addClass(tooltipBox, CLASS_TRANSITION);
+        tooltipBox.removeAttribute('aria-hidden');
+
+        // Force reflow to enable CSS3 transition
+        tooltipBox.initialOffsetWidth = tooltipBox.offsetWidth;
+        addClass(tooltipBox, CLASS_IN);
+      } else {
+        addClass(tooltipBox, CLASS_SHOW);
+        tooltipBox.removeAttribute('aria-hidden');
+      }
+    } else {
+      clearTimeout(this.tooltipping);
+    }
+    this.tooltipping = setTimeout(function () {
+      if (options.transition) {
+        addListener(tooltipBox, EVENT_TRANSITION_END, function () {
+          removeClass(tooltipBox, CLASS_SHOW);
+          removeClass(tooltipBox, CLASS_FADE);
+          removeClass(tooltipBox, CLASS_TRANSITION);
+          tooltipBox.setAttribute('aria-hidden', true);
+          _this11.fading = false;
+        }, {
+          once: true
+        });
+        removeClass(tooltipBox, CLASS_IN);
+        _this11.fading = true;
+      } else {
+        removeClass(tooltipBox, CLASS_SHOW);
+        tooltipBox.setAttribute('aria-hidden', true);
+      }
+      _this11.tooltipping = false;
+    }, 1000);
+    return this;
+  },
+  /**
+   * Toggle the image size between its current size and natural size
+   * @param {Event} [_originalEvent=null] - The original event if any.
+   * @returns {Viewer} this
+   */
+  toggle: function toggle() {
+    var _originalEvent = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
+    if (this.imageData.ratio === 1) {
+      this.zoomTo(this.imageData.oldRatio, true, null, _originalEvent);
+    } else {
+      this.zoomTo(1, true, null, _originalEvent);
+    }
+    return this;
+  },
+  // Reset the image to its initial state
+  reset: function reset() {
+    if (this.viewed && !this.played) {
+      this.imageData = assign({}, this.initialImageData);
+      this.renderImage();
+    }
+    return this;
+  },
+  // Update viewer when images changed
+  update: function update() {
+    var _this12 = this;
+    var element = this.element,
+      options = this.options,
+      isImg = this.isImg;
+
+    // Destroy viewer if the target image was deleted
+    if (isImg && !element.parentNode) {
+      return this.destroy();
+    }
+    var images = [];
+    forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
+      if (isFunction(options.filter)) {
+        if (options.filter.call(_this12, image)) {
+          images.push(image);
+        }
+      } else if (_this12.getImageURL(image)) {
+        images.push(image);
+      }
+    });
+    if (!images.length) {
+      return this;
+    }
+    this.images = images;
+    this.length = images.length;
+    if (this.ready) {
+      var changedIndexes = [];
+      forEach(this.items, function (item, i) {
+        var img = item.querySelector('img');
+        var image = images[i];
+        if (image && img) {
+          if (image.src !== img.src
+
+          // Title changed (#408)
+          || image.alt !== img.alt) {
+            changedIndexes.push(i);
+          }
+        } else {
+          changedIndexes.push(i);
+        }
+      });
+      setStyle(this.list, {
+        width: 'auto'
+      });
+      this.initList();
+      if (this.isShown) {
+        if (this.length) {
+          if (this.viewed) {
+            var changedIndex = changedIndexes.indexOf(this.index);
+            if (changedIndex >= 0) {
+              this.viewed = false;
+              this.view(Math.max(Math.min(this.index - changedIndex, this.length - 1), 0));
+            } else {
+              var activeItem = this.items[this.index];
+
+              // Reactivate the current viewing item after reset the list.
+              addClass(activeItem, CLASS_ACTIVE);
+              activeItem.setAttribute('aria-selected', true);
+            }
+          }
+        } else {
+          this.image = null;
+          this.viewed = false;
+          this.index = 0;
+          this.imageData = {};
+          this.canvas.innerHTML = '';
+          this.title.innerHTML = '';
+        }
+      }
+    } else {
+      this.build();
+    }
+    return this;
+  },
+  // Destroy the viewer
+  destroy: function destroy() {
+    var element = this.element,
+      options = this.options;
+    if (!element[NAMESPACE]) {
+      return this;
+    }
+    this.destroyed = true;
+    if (this.ready) {
+      if (this.played) {
+        this.stop();
+      }
+      if (options.inline) {
+        if (this.fulled) {
+          this.exit();
+        }
+        this.unbind();
+      } else if (this.isShown) {
+        if (this.viewing) {
+          if (this.imageRendering) {
+            this.imageRendering.abort();
+          } else if (this.imageInitializing) {
+            this.imageInitializing.abort();
+          }
+        }
+        if (this.hiding) {
+          this.transitioning.abort();
+        }
+        this.hidden();
+      } else if (this.showing) {
+        this.transitioning.abort();
+        this.hidden();
+      }
+      this.ready = false;
+      this.viewer.parentNode.removeChild(this.viewer);
+    } else if (options.inline) {
+      if (this.delaying) {
+        this.delaying.abort();
+      } else if (this.initializing) {
+        this.initializing.abort();
+      }
+    }
+    if (!options.inline) {
+      removeListener(element, EVENT_CLICK, this.onStart);
+    }
+    element[NAMESPACE] = undefined;
+    return this;
+  }
+};
+
+var others = {
+  getImageURL: function getImageURL(image) {
+    var url = this.options.url;
+    if (isString(url)) {
+      url = image.getAttribute(url);
+    } else if (isFunction(url)) {
+      url = url.call(this, image);
+    } else {
+      url = '';
+    }
+    return url;
+  },
+  enforceFocus: function enforceFocus() {
+    var _this = this;
+    this.clearEnforceFocus();
+    addListener(document, EVENT_FOCUSIN, this.onFocusin = function (event) {
+      var viewer = _this.viewer;
+      var target = event.target;
+      if (target === document || target === viewer || viewer.contains(target)) {
+        return;
+      }
+      while (target) {
+        // Avoid conflicts with other modals (#474, #540)
+        if (target.getAttribute('tabindex') !== null || target.getAttribute('aria-modal') === 'true') {
+          return;
+        }
+        target = target.parentElement;
+      }
+      viewer.focus();
+    });
+  },
+  clearEnforceFocus: function clearEnforceFocus() {
+    if (this.onFocusin) {
+      removeListener(document, EVENT_FOCUSIN, this.onFocusin);
+      this.onFocusin = null;
+    }
+  },
+  open: function open() {
+    var body = this.body;
+    addClass(body, CLASS_OPEN);
+    if (this.scrollbarWidth > 0) {
+      body.style.paddingRight = "".concat(this.scrollbarWidth + (parseFloat(this.initialBodyComputedPaddingRight) || 0), "px");
+    }
+  },
+  close: function close() {
+    var body = this.body;
+    removeClass(body, CLASS_OPEN);
+    if (this.scrollbarWidth > 0) {
+      body.style.paddingRight = this.initialBodyPaddingRight;
+    }
+  },
+  shown: function shown() {
+    var element = this.element,
+      options = this.options,
+      viewer = this.viewer;
+    this.fulled = true;
+    this.isShown = true;
+    this.render();
+    this.bind();
+    this.showing = false;
+    if (options.focus) {
+      viewer.focus();
+      this.enforceFocus();
+    }
+    if (isFunction(options.shown)) {
+      addListener(element, EVENT_SHOWN, options.shown, {
+        once: true
+      });
+    }
+    if (dispatchEvent(element, EVENT_SHOWN) === false) {
+      return;
+    }
+    if (this.ready && this.isShown && !this.hiding) {
+      this.view(this.index);
+    }
+  },
+  hidden: function hidden() {
+    var element = this.element,
+      options = this.options,
+      viewer = this.viewer;
+    if (options.fucus) {
+      this.clearEnforceFocus();
+    }
+    this.fulled = false;
+    this.viewed = false;
+    this.isShown = false;
+    this.close();
+    this.unbind();
+    addClass(viewer, CLASS_HIDE);
+    viewer.removeAttribute('role');
+    viewer.removeAttribute('aria-labelledby');
+    viewer.removeAttribute('aria-modal');
+    viewer.setAttribute('aria-hidden', true);
+    this.resetList();
+    this.resetImage();
+    this.hiding = false;
+    if (!this.destroyed) {
+      if (isFunction(options.hidden)) {
+        addListener(element, EVENT_HIDDEN, options.hidden, {
+          once: true
+        });
+      }
+      dispatchEvent(element, EVENT_HIDDEN, null, {
+        cancelable: false
+      });
+    }
+  },
+  requestFullscreen: function requestFullscreen(options) {
+    var document = this.element.ownerDocument;
+    if (this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+      var documentElement = document.documentElement;
+
+      // Element.requestFullscreen()
+      if (documentElement.requestFullscreen) {
+        // Avoid TypeError when convert `options` to dictionary
+        if (isPlainObject(options)) {
+          documentElement.requestFullscreen(options);
+        } else {
+          documentElement.requestFullscreen();
+        }
+      } else if (documentElement.webkitRequestFullscreen) {
+        documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
+      } else if (documentElement.mozRequestFullScreen) {
+        documentElement.mozRequestFullScreen();
+      } else if (documentElement.msRequestFullscreen) {
+        documentElement.msRequestFullscreen();
+      }
+    }
+  },
+  exitFullscreen: function exitFullscreen() {
+    var document = this.element.ownerDocument;
+    if (this.fulled && (document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+      // Document.exitFullscreen()
+      if (document.exitFullscreen) {
+        document.exitFullscreen();
+      } else if (document.webkitExitFullscreen) {
+        document.webkitExitFullscreen();
+      } else if (document.mozCancelFullScreen) {
+        document.mozCancelFullScreen();
+      } else if (document.msExitFullscreen) {
+        document.msExitFullscreen();
+      }
+    }
+  },
+  change: function change(event) {
+    var options = this.options,
+      pointers = this.pointers;
+    var pointer = pointers[Object.keys(pointers)[0]];
+
+    // In the case of the `pointers` object is empty (#421)
+    if (!pointer) {
+      return;
+    }
+    var offsetX = pointer.endX - pointer.startX;
+    var offsetY = pointer.endY - pointer.startY;
+    switch (this.action) {
+      // Move the current image
+      case ACTION_MOVE:
+        this.move(offsetX, offsetY, event);
+        break;
+
+      // Zoom the current image
+      case ACTION_ZOOM:
+        this.zoom(getMaxZoomRatio(pointers), false, null, event);
+        break;
+      case ACTION_SWITCH:
+        {
+          this.action = 'switched';
+          var absoluteOffsetX = Math.abs(offsetX);
+          if (absoluteOffsetX > 1 && absoluteOffsetX > Math.abs(offsetY)) {
+            // Empty `pointers` as `touchend` event will not be fired after swiped in iOS browsers.
+            this.pointers = {};
+            if (offsetX > 1) {
+              this.prev(options.loop);
+            } else if (offsetX < -1) {
+              this.next(options.loop);
+            }
+          }
+          break;
+        }
+    }
+
+    // Override
+    forEach(pointers, function (p) {
+      p.startX = p.endX;
+      p.startY = p.endY;
+    });
+  },
+  isSwitchable: function isSwitchable() {
+    var imageData = this.imageData,
+      viewerData = this.viewerData;
+    return this.length > 1 && imageData.x >= 0 && imageData.y >= 0 && imageData.width <= viewerData.width && imageData.height <= viewerData.height;
+  }
+};
+
+var AnotherViewer = WINDOW.Viewer;
+var getUniqueID = function (id) {
+  return function () {
+    id += 1;
+    return id;
+  };
+}(-1);
+var Viewer = /*#__PURE__*/function () {
+  /**
+   * Create a new Viewer.
+   * @param {Element} element - The target element for viewing.
+   * @param {Object} [options={}] - The configuration options.
+   */
+  function Viewer(element) {
+    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+    _classCallCheck(this, Viewer);
+    if (!element || element.nodeType !== 1) {
+      throw new Error('The first argument is required and must be an element.');
+    }
+    this.element = element;
+    this.options = assign({}, DEFAULTS, isPlainObject(options) && options);
+    this.action = false;
+    this.fading = false;
+    this.fulled = false;
+    this.hiding = false;
+    this.imageClicked = false;
+    this.imageData = {};
+    this.index = this.options.initialViewIndex;
+    this.isImg = false;
+    this.isShown = false;
+    this.length = 0;
+    this.moving = false;
+    this.played = false;
+    this.playing = false;
+    this.pointers = {};
+    this.ready = false;
+    this.rotating = false;
+    this.scaling = false;
+    this.showing = false;
+    this.timeout = false;
+    this.tooltipping = false;
+    this.viewed = false;
+    this.viewing = false;
+    this.wheeling = false;
+    this.zooming = false;
+    this.pointerMoved = false;
+    this.id = getUniqueID();
+    this.init();
+  }
+  _createClass(Viewer, [{
+    key: "init",
+    value: function init() {
+      var _this = this;
+      var element = this.element,
+        options = this.options;
+      if (element[NAMESPACE]) {
+        return;
+      }
+      element[NAMESPACE] = this;
+
+      // The `focus` option requires the `keyboard` option set to `true`.
+      if (options.focus && !options.keyboard) {
+        options.focus = false;
+      }
+      var isImg = element.localName === 'img';
+      var images = [];
+      forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
+        if (isFunction(options.filter)) {
+          if (options.filter.call(_this, image)) {
+            images.push(image);
+          }
+        } else if (_this.getImageURL(image)) {
+          images.push(image);
+        }
+      });
+      this.isImg = isImg;
+      this.length = images.length;
+      this.images = images;
+      this.initBody();
+
+      // Override `transition` option if it is not supported
+      if (isUndefined(document.createElement(NAMESPACE).style.transition)) {
+        options.transition = false;
+      }
+      if (options.inline) {
+        var count = 0;
+        var progress = function progress() {
+          count += 1;
+          if (count === _this.length) {
+            var timeout;
+            _this.initializing = false;
+            _this.delaying = {
+              abort: function abort() {
+                clearTimeout(timeout);
+              }
+            };
+
+            // build asynchronously to keep `this.viewer` is accessible in `ready` event handler.
+            timeout = setTimeout(function () {
+              _this.delaying = false;
+              _this.build();
+            }, 0);
+          }
+        };
+        this.initializing = {
+          abort: function abort() {
+            forEach(images, function (image) {
+              if (!image.complete) {
+                removeListener(image, EVENT_LOAD, progress);
+                removeListener(image, EVENT_ERROR, progress);
+              }
+            });
+          }
+        };
+        forEach(images, function (image) {
+          if (image.complete) {
+            progress();
+          } else {
+            var onLoad;
+            var onError;
+            addListener(image, EVENT_LOAD, onLoad = function onLoad() {
+              removeListener(image, EVENT_ERROR, onError);
+              progress();
+            }, {
+              once: true
+            });
+            addListener(image, EVENT_ERROR, onError = function onError() {
+              removeListener(image, EVENT_LOAD, onLoad);
+              progress();
+            }, {
+              once: true
+            });
+          }
+        });
+      } else {
+        addListener(element, EVENT_CLICK, this.onStart = function (_ref) {
+          var target = _ref.target;
+          if (target.localName === 'img' && (!isFunction(options.filter) || options.filter.call(_this, target))) {
+            _this.view(_this.images.indexOf(target));
+          }
+        });
+      }
+    }
+  }, {
+    key: "build",
+    value: function build() {
+      if (this.ready) {
+        return;
+      }
+      var element = this.element,
+        options = this.options;
+      var parent = element.parentNode;
+      var template = document.createElement('div');
+      template.innerHTML = TEMPLATE;
+      var viewer = template.querySelector(".".concat(NAMESPACE, "-container"));
+      var title = viewer.querySelector(".".concat(NAMESPACE, "-title"));
+      var toolbar = viewer.querySelector(".".concat(NAMESPACE, "-toolbar"));
+      var navbar = viewer.querySelector(".".concat(NAMESPACE, "-navbar"));
+      var button = viewer.querySelector(".".concat(NAMESPACE, "-button"));
+      var canvas = viewer.querySelector(".".concat(NAMESPACE, "-canvas"));
+      this.parent = parent;
+      this.viewer = viewer;
+      this.title = title;
+      this.toolbar = toolbar;
+      this.navbar = navbar;
+      this.button = button;
+      this.canvas = canvas;
+      this.footer = viewer.querySelector(".".concat(NAMESPACE, "-footer"));
+      this.tooltipBox = viewer.querySelector(".".concat(NAMESPACE, "-tooltip"));
+      this.player = viewer.querySelector(".".concat(NAMESPACE, "-player"));
+      this.list = viewer.querySelector(".".concat(NAMESPACE, "-list"));
+      viewer.id = "".concat(NAMESPACE).concat(this.id);
+      title.id = "".concat(NAMESPACE, "Title").concat(this.id);
+      addClass(title, !options.title ? CLASS_HIDE : getResponsiveClass(Array.isArray(options.title) ? options.title[0] : options.title));
+      addClass(navbar, !options.navbar ? CLASS_HIDE : getResponsiveClass(options.navbar));
+      toggleClass(button, CLASS_HIDE, !options.button);
+      if (options.keyboard) {
+        button.setAttribute('tabindex', 0);
+      }
+      if (options.backdrop) {
+        addClass(viewer, "".concat(NAMESPACE, "-backdrop"));
+        if (!options.inline && options.backdrop !== 'static') {
+          setData(canvas, DATA_ACTION, 'hide');
+        }
+      }
+      if (isString(options.className) && options.className) {
+        // In case there are multiple class names
+        options.className.split(REGEXP_SPACES).forEach(function (className) {
+          addClass(viewer, className);
+        });
+      }
+      if (options.toolbar) {
+        var list = document.createElement('ul');
+        var custom = isPlainObject(options.toolbar);
+        var zoomButtons = BUTTONS.slice(0, 3);
+        var rotateButtons = BUTTONS.slice(7, 9);
+        var scaleButtons = BUTTONS.slice(9);
+        if (!custom) {
+          addClass(toolbar, getResponsiveClass(options.toolbar));
+        }
+        forEach(custom ? options.toolbar : BUTTONS, function (value, index) {
+          var deep = custom && isPlainObject(value);
+          var name = custom ? hyphenate(index) : value;
+          var show = deep && !isUndefined(value.show) ? value.show : value;
+          if (!show || !options.zoomable && zoomButtons.indexOf(name) !== -1 || !options.rotatable && rotateButtons.indexOf(name) !== -1 || !options.scalable && scaleButtons.indexOf(name) !== -1) {
+            return;
+          }
+          var size = deep && !isUndefined(value.size) ? value.size : value;
+          var click = deep && !isUndefined(value.click) ? value.click : value;
+          var item = document.createElement('li');
+          if (options.keyboard) {
+            item.setAttribute('tabindex', 0);
+          }
+          item.setAttribute('role', 'button');
+          addClass(item, "".concat(NAMESPACE, "-").concat(name));
+          if (!isFunction(click)) {
+            setData(item, DATA_ACTION, name);
+          }
+          if (isNumber(show)) {
+            addClass(item, getResponsiveClass(show));
+          }
+          if (['small', 'large'].indexOf(size) !== -1) {
+            addClass(item, "".concat(NAMESPACE, "-").concat(size));
+          } else if (name === 'play') {
+            addClass(item, "".concat(NAMESPACE, "-large"));
+          }
+          if (isFunction(click)) {
+            addListener(item, EVENT_CLICK, click);
+          }
+          list.appendChild(item);
+        });
+        toolbar.appendChild(list);
+      } else {
+        addClass(toolbar, CLASS_HIDE);
+      }
+      if (!options.rotatable) {
+        var rotates = toolbar.querySelectorAll('li[class*="rotate"]');
+        addClass(rotates, CLASS_INVISIBLE);
+        forEach(rotates, function (rotate) {
+          toolbar.appendChild(rotate);
+        });
+      }
+      if (options.inline) {
+        addClass(button, CLASS_FULLSCREEN);
+        setStyle(viewer, {
+          zIndex: options.zIndexInline
+        });
+        if (window.getComputedStyle(parent).position === 'static') {
+          setStyle(parent, {
+            position: 'relative'
+          });
+        }
+        parent.insertBefore(viewer, element.nextSibling);
+      } else {
+        addClass(button, CLASS_CLOSE);
+        addClass(viewer, CLASS_FIXED);
+        addClass(viewer, CLASS_FADE);
+        addClass(viewer, CLASS_HIDE);
+        setStyle(viewer, {
+          zIndex: options.zIndex
+        });
+        var container = options.container;
+        if (isString(container)) {
+          container = element.ownerDocument.querySelector(container);
+        }
+        if (!container) {
+          container = this.body;
+        }
+        container.appendChild(viewer);
+      }
+      if (options.inline) {
+        this.render();
+        this.bind();
+        this.isShown = true;
+      }
+      this.ready = true;
+      if (isFunction(options.ready)) {
+        addListener(element, EVENT_READY, options.ready, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_READY) === false) {
+        this.ready = false;
+        return;
+      }
+      if (this.ready && options.inline) {
+        this.view(this.index);
+      }
+    }
+
+    /**
+     * Get the no conflict viewer class.
+     * @returns {Viewer} The viewer class.
+     */
+  }], [{
+    key: "noConflict",
+    value: function noConflict() {
+      window.Viewer = AnotherViewer;
+      return Viewer;
+    }
+
+    /**
+     * Change the default options.
+     * @param {Object} options - The new default options.
+     */
+  }, {
+    key: "setDefaults",
+    value: function setDefaults(options) {
+      assign(DEFAULTS, isPlainObject(options) && options);
+    }
+  }]);
+  return Viewer;
+}();
+assign(Viewer.prototype, render, events, handlers, methods, others);
+
+export { Viewer as default };
diff --git a/static/viewerjs/dist/viewer.js b/static/viewerjs/dist/viewer.js
new file mode 100644
index 0000000..e1381dc
--- /dev/null
+++ b/static/viewerjs/dist/viewer.js
@@ -0,0 +1,3241 @@
+/*!
+ * Viewer.js v1.11.2
+ * https://fengyuanchen.github.io/viewerjs
+ *
+ * Copyright 2015-present Chen Fengyuan
+ * Released under the MIT license
+ *
+ * Date: 2023-01-01T10:14:49.638Z
+ */
+
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Viewer = factory());
+})(this, (function () { 'use strict';
+
+  function ownKeys(object, enumerableOnly) {
+    var keys = Object.keys(object);
+    if (Object.getOwnPropertySymbols) {
+      var symbols = Object.getOwnPropertySymbols(object);
+      enumerableOnly && (symbols = symbols.filter(function (sym) {
+        return Object.getOwnPropertyDescriptor(object, sym).enumerable;
+      })), keys.push.apply(keys, symbols);
+    }
+    return keys;
+  }
+  function _objectSpread2(target) {
+    for (var i = 1; i < arguments.length; i++) {
+      var source = null != arguments[i] ? arguments[i] : {};
+      i % 2 ? ownKeys(Object(source), !0).forEach(function (key) {
+        _defineProperty(target, key, source[key]);
+      }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) {
+        Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
+      });
+    }
+    return target;
+  }
+  function _typeof(obj) {
+    "@babel/helpers - typeof";
+
+    return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) {
+      return typeof obj;
+    } : function (obj) {
+      return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
+    }, _typeof(obj);
+  }
+  function _classCallCheck(instance, Constructor) {
+    if (!(instance instanceof Constructor)) {
+      throw new TypeError("Cannot call a class as a function");
+    }
+  }
+  function _defineProperties(target, props) {
+    for (var i = 0; i < props.length; i++) {
+      var descriptor = props[i];
+      descriptor.enumerable = descriptor.enumerable || false;
+      descriptor.configurable = true;
+      if ("value" in descriptor) descriptor.writable = true;
+      Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor);
+    }
+  }
+  function _createClass(Constructor, protoProps, staticProps) {
+    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
+    if (staticProps) _defineProperties(Constructor, staticProps);
+    Object.defineProperty(Constructor, "prototype", {
+      writable: false
+    });
+    return Constructor;
+  }
+  function _defineProperty(obj, key, value) {
+    key = _toPropertyKey(key);
+    if (key in obj) {
+      Object.defineProperty(obj, key, {
+        value: value,
+        enumerable: true,
+        configurable: true,
+        writable: true
+      });
+    } else {
+      obj[key] = value;
+    }
+    return obj;
+  }
+  function _toPrimitive(input, hint) {
+    if (typeof input !== "object" || input === null) return input;
+    var prim = input[Symbol.toPrimitive];
+    if (prim !== undefined) {
+      var res = prim.call(input, hint || "default");
+      if (typeof res !== "object") return res;
+      throw new TypeError("@@toPrimitive must return a primitive value.");
+    }
+    return (hint === "string" ? String : Number)(input);
+  }
+  function _toPropertyKey(arg) {
+    var key = _toPrimitive(arg, "string");
+    return typeof key === "symbol" ? key : String(key);
+  }
+
+  var DEFAULTS = {
+    /**
+     * Enable a modal backdrop, specify `static` for a backdrop
+     * which doesn't close the modal on click.
+     * @type {boolean}
+     */
+    backdrop: true,
+    /**
+     * Show the button on the top-right of the viewer.
+     * @type {boolean}
+     */
+    button: true,
+    /**
+     * Show the navbar.
+     * @type {boolean | number}
+     */
+    navbar: true,
+    /**
+     * Specify the visibility and the content of the title.
+     * @type {boolean | number | Function | Array}
+     */
+    title: true,
+    /**
+     * Show the toolbar.
+     * @type {boolean | number | Object}
+     */
+    toolbar: true,
+    /**
+     * Custom class name(s) to add to the viewer's root element.
+     * @type {string}
+     */
+    className: '',
+    /**
+     * Define where to put the viewer in modal mode.
+     * @type {string | Element}
+     */
+    container: 'body',
+    /**
+     * Filter the images for viewing. Return true if the image is viewable.
+     * @type {Function}
+     */
+    filter: null,
+    /**
+     * Enable to request fullscreen when play.
+     * {@link https://developer.mozilla.org/en-US/docs/Web/API/FullscreenOptions}
+     * @type {boolean|FullscreenOptions}
+     */
+    fullscreen: true,
+    /**
+     * Define the extra attributes to inherit from the original image.
+     * @type {Array}
+     */
+    inheritedAttributes: ['crossOrigin', 'decoding', 'isMap', 'loading', 'referrerPolicy', 'sizes', 'srcset', 'useMap'],
+    /**
+     * Define the initial coverage of the viewing image.
+     * @type {number}
+     */
+    initialCoverage: 0.9,
+    /**
+     * Define the initial index of the image for viewing.
+     * @type {number}
+     */
+    initialViewIndex: 0,
+    /**
+     * Enable inline mode.
+     * @type {boolean}
+     */
+    inline: false,
+    /**
+     * The amount of time to delay between automatically cycling an image when playing.
+     * @type {number}
+     */
+    interval: 5000,
+    /**
+     * Enable keyboard support.
+     * @type {boolean}
+     */
+    keyboard: true,
+    /**
+     * Focus the viewer when initialized.
+     * @type {boolean}
+     */
+    focus: true,
+    /**
+     * Indicate if show a loading spinner when load image or not.
+     * @type {boolean}
+     */
+    loading: true,
+    /**
+     * Indicate if enable loop viewing or not.
+     * @type {boolean}
+     */
+    loop: true,
+    /**
+     * Min width of the viewer in inline mode.
+     * @type {number}
+     */
+    minWidth: 200,
+    /**
+     * Min height of the viewer in inline mode.
+     * @type {number}
+     */
+    minHeight: 100,
+    /**
+     * Enable to move the image.
+     * @type {boolean}
+     */
+    movable: true,
+    /**
+     * Enable to rotate the image.
+     * @type {boolean}
+     */
+    rotatable: true,
+    /**
+     * Enable to scale the image.
+     * @type {boolean}
+     */
+    scalable: true,
+    /**
+     * Enable to zoom the image.
+     * @type {boolean}
+     */
+    zoomable: true,
+    /**
+     * Enable to zoom the current image by dragging on the touch screen.
+     * @type {boolean}
+     */
+    zoomOnTouch: true,
+    /**
+     * Enable to zoom the image by wheeling mouse.
+     * @type {boolean}
+     */
+    zoomOnWheel: true,
+    /**
+     * Enable to slide to the next or previous image by swiping on the touch screen.
+     * @type {boolean}
+     */
+    slideOnTouch: true,
+    /**
+     * Indicate if toggle the image size between its natural size
+     * and initial size when double click on the image or not.
+     * @type {boolean}
+     */
+    toggleOnDblclick: true,
+    /**
+     * Show the tooltip with image ratio (percentage) when zoom in or zoom out.
+     * @type {boolean}
+     */
+    tooltip: true,
+    /**
+     * Enable CSS3 Transition for some special elements.
+     * @type {boolean}
+     */
+    transition: true,
+    /**
+     * Define the CSS `z-index` value of viewer in modal mode.
+     * @type {number}
+     */
+    zIndex: 2015,
+    /**
+     * Define the CSS `z-index` value of viewer in inline mode.
+     * @type {number}
+     */
+    zIndexInline: 0,
+    /**
+     * Define the ratio when zoom the image by wheeling mouse.
+     * @type {number}
+     */
+    zoomRatio: 0.1,
+    /**
+     * Define the min ratio of the image when zoom out.
+     * @type {number}
+     */
+    minZoomRatio: 0.01,
+    /**
+     * Define the max ratio of the image when zoom in.
+     * @type {number}
+     */
+    maxZoomRatio: 100,
+    /**
+     * Define where to get the original image URL for viewing.
+     * @type {string | Function}
+     */
+    url: 'src',
+    /**
+     * Event shortcuts.
+     * @type {Function}
+     */
+    ready: null,
+    show: null,
+    shown: null,
+    hide: null,
+    hidden: null,
+    view: null,
+    viewed: null,
+    move: null,
+    moved: null,
+    rotate: null,
+    rotated: null,
+    scale: null,
+    scaled: null,
+    zoom: null,
+    zoomed: null,
+    play: null,
+    stop: null
+  };
+
+  var TEMPLATE = '<div class="viewer-container" tabindex="-1" touch-action="none">' + '<div class="viewer-canvas"></div>' + '<div class="viewer-footer">' + '<div class="viewer-title"></div>' + '<div class="viewer-toolbar"></div>' + '<div class="viewer-navbar">' + '<ul class="viewer-list" role="navigation"></ul>' + '</div>' + '</div>' + '<div class="viewer-tooltip" role="alert" aria-hidden="true"></div>' + '<div class="viewer-button" data-viewer-action="mix" role="button"></div>' + '<div class="viewer-player"></div>' + '</div>';
+
+  var IS_BROWSER = typeof window !== 'undefined' && typeof window.document !== 'undefined';
+  var WINDOW = IS_BROWSER ? window : {};
+  var IS_TOUCH_DEVICE = IS_BROWSER && WINDOW.document.documentElement ? 'ontouchstart' in WINDOW.document.documentElement : false;
+  var HAS_POINTER_EVENT = IS_BROWSER ? 'PointerEvent' in WINDOW : false;
+  var NAMESPACE = 'viewer';
+
+  // Actions
+  var ACTION_MOVE = 'move';
+  var ACTION_SWITCH = 'switch';
+  var ACTION_ZOOM = 'zoom';
+
+  // Classes
+  var CLASS_ACTIVE = "".concat(NAMESPACE, "-active");
+  var CLASS_CLOSE = "".concat(NAMESPACE, "-close");
+  var CLASS_FADE = "".concat(NAMESPACE, "-fade");
+  var CLASS_FIXED = "".concat(NAMESPACE, "-fixed");
+  var CLASS_FULLSCREEN = "".concat(NAMESPACE, "-fullscreen");
+  var CLASS_FULLSCREEN_EXIT = "".concat(NAMESPACE, "-fullscreen-exit");
+  var CLASS_HIDE = "".concat(NAMESPACE, "-hide");
+  var CLASS_HIDE_MD_DOWN = "".concat(NAMESPACE, "-hide-md-down");
+  var CLASS_HIDE_SM_DOWN = "".concat(NAMESPACE, "-hide-sm-down");
+  var CLASS_HIDE_XS_DOWN = "".concat(NAMESPACE, "-hide-xs-down");
+  var CLASS_IN = "".concat(NAMESPACE, "-in");
+  var CLASS_INVISIBLE = "".concat(NAMESPACE, "-invisible");
+  var CLASS_LOADING = "".concat(NAMESPACE, "-loading");
+  var CLASS_MOVE = "".concat(NAMESPACE, "-move");
+  var CLASS_OPEN = "".concat(NAMESPACE, "-open");
+  var CLASS_SHOW = "".concat(NAMESPACE, "-show");
+  var CLASS_TRANSITION = "".concat(NAMESPACE, "-transition");
+
+  // Native events
+  var EVENT_CLICK = 'click';
+  var EVENT_DBLCLICK = 'dblclick';
+  var EVENT_DRAG_START = 'dragstart';
+  var EVENT_FOCUSIN = 'focusin';
+  var EVENT_KEY_DOWN = 'keydown';
+  var EVENT_LOAD = 'load';
+  var EVENT_ERROR = 'error';
+  var EVENT_TOUCH_END = IS_TOUCH_DEVICE ? 'touchend touchcancel' : 'mouseup';
+  var EVENT_TOUCH_MOVE = IS_TOUCH_DEVICE ? 'touchmove' : 'mousemove';
+  var EVENT_TOUCH_START = IS_TOUCH_DEVICE ? 'touchstart' : 'mousedown';
+  var EVENT_POINTER_DOWN = HAS_POINTER_EVENT ? 'pointerdown' : EVENT_TOUCH_START;
+  var EVENT_POINTER_MOVE = HAS_POINTER_EVENT ? 'pointermove' : EVENT_TOUCH_MOVE;
+  var EVENT_POINTER_UP = HAS_POINTER_EVENT ? 'pointerup pointercancel' : EVENT_TOUCH_END;
+  var EVENT_RESIZE = 'resize';
+  var EVENT_TRANSITION_END = 'transitionend';
+  var EVENT_WHEEL = 'wheel';
+
+  // Custom events
+  var EVENT_READY = 'ready';
+  var EVENT_SHOW = 'show';
+  var EVENT_SHOWN = 'shown';
+  var EVENT_HIDE = 'hide';
+  var EVENT_HIDDEN = 'hidden';
+  var EVENT_VIEW = 'view';
+  var EVENT_VIEWED = 'viewed';
+  var EVENT_MOVE = 'move';
+  var EVENT_MOVED = 'moved';
+  var EVENT_ROTATE = 'rotate';
+  var EVENT_ROTATED = 'rotated';
+  var EVENT_SCALE = 'scale';
+  var EVENT_SCALED = 'scaled';
+  var EVENT_ZOOM = 'zoom';
+  var EVENT_ZOOMED = 'zoomed';
+  var EVENT_PLAY = 'play';
+  var EVENT_STOP = 'stop';
+
+  // Data keys
+  var DATA_ACTION = "".concat(NAMESPACE, "Action");
+
+  // RegExps
+  var REGEXP_SPACES = /\s\s*/;
+
+  // Misc
+  var BUTTONS = ['zoom-in', 'zoom-out', 'one-to-one', 'reset', 'prev', 'play', 'next', 'rotate-left', 'rotate-right', 'flip-horizontal', 'flip-vertical'];
+
+  /**
+   * Check if the given value is a string.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is a string, else `false`.
+   */
+  function isString(value) {
+    return typeof value === 'string';
+  }
+
+  /**
+   * Check if the given value is not a number.
+   */
+  var isNaN = Number.isNaN || WINDOW.isNaN;
+
+  /**
+   * Check if the given value is a number.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is a number, else `false`.
+   */
+  function isNumber(value) {
+    return typeof value === 'number' && !isNaN(value);
+  }
+
+  /**
+   * Check if the given value is undefined.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is undefined, else `false`.
+   */
+  function isUndefined(value) {
+    return typeof value === 'undefined';
+  }
+
+  /**
+   * Check if the given value is an object.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is an object, else `false`.
+   */
+  function isObject(value) {
+    return _typeof(value) === 'object' && value !== null;
+  }
+  var hasOwnProperty = Object.prototype.hasOwnProperty;
+
+  /**
+   * Check if the given value is a plain object.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is a plain object, else `false`.
+   */
+  function isPlainObject(value) {
+    if (!isObject(value)) {
+      return false;
+    }
+    try {
+      var _constructor = value.constructor;
+      var prototype = _constructor.prototype;
+      return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
+    } catch (error) {
+      return false;
+    }
+  }
+
+  /**
+   * Check if the given value is a function.
+   * @param {*} value - The value to check.
+   * @returns {boolean} Returns `true` if the given value is a function, else `false`.
+   */
+  function isFunction(value) {
+    return typeof value === 'function';
+  }
+
+  /**
+   * Iterate the given data.
+   * @param {*} data - The data to iterate.
+   * @param {Function} callback - The process function for each element.
+   * @returns {*} The original data.
+   */
+  function forEach(data, callback) {
+    if (data && isFunction(callback)) {
+      if (Array.isArray(data) || isNumber(data.length) /* array-like */) {
+        var length = data.length;
+        var i;
+        for (i = 0; i < length; i += 1) {
+          if (callback.call(data, data[i], i, data) === false) {
+            break;
+          }
+        }
+      } else if (isObject(data)) {
+        Object.keys(data).forEach(function (key) {
+          callback.call(data, data[key], key, data);
+        });
+      }
+    }
+    return data;
+  }
+
+  /**
+   * Extend the given object.
+   * @param {*} obj - The object to be extended.
+   * @param {*} args - The rest objects which will be merged to the first object.
+   * @returns {Object} The extended object.
+   */
+  var assign = Object.assign || function assign(obj) {
+    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+      args[_key - 1] = arguments[_key];
+    }
+    if (isObject(obj) && args.length > 0) {
+      args.forEach(function (arg) {
+        if (isObject(arg)) {
+          Object.keys(arg).forEach(function (key) {
+            obj[key] = arg[key];
+          });
+        }
+      });
+    }
+    return obj;
+  };
+  var REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/;
+
+  /**
+   * Apply styles to the given element.
+   * @param {Element} element - The target element.
+   * @param {Object} styles - The styles for applying.
+   */
+  function setStyle(element, styles) {
+    var style = element.style;
+    forEach(styles, function (value, property) {
+      if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
+        value += 'px';
+      }
+      style[property] = value;
+    });
+  }
+
+  /**
+   * Escape a string for using in HTML.
+   * @param {String} value - The string to escape.
+   * @returns {String} Returns the escaped string.
+   */
+  function escapeHTMLEntities(value) {
+    return isString(value) ? value.replace(/&(?!amp;|quot;|#39;|lt;|gt;)/g, '&amp;').replace(/"/g, '&quot;').replace(/'/g, '&#39;').replace(/</g, '&lt;').replace(/>/g, '&gt;') : value;
+  }
+
+  /**
+   * Check if the given element has a special class.
+   * @param {Element} element - The element to check.
+   * @param {string} value - The class to search.
+   * @returns {boolean} Returns `true` if the special class was found.
+   */
+  function hasClass(element, value) {
+    if (!element || !value) {
+      return false;
+    }
+    return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1;
+  }
+
+  /**
+   * Add classes to the given element.
+   * @param {Element} element - The target element.
+   * @param {string} value - The classes to be added.
+   */
+  function addClass(element, value) {
+    if (!element || !value) {
+      return;
+    }
+    if (isNumber(element.length)) {
+      forEach(element, function (elem) {
+        addClass(elem, value);
+      });
+      return;
+    }
+    if (element.classList) {
+      element.classList.add(value);
+      return;
+    }
+    var className = element.className.trim();
+    if (!className) {
+      element.className = value;
+    } else if (className.indexOf(value) < 0) {
+      element.className = "".concat(className, " ").concat(value);
+    }
+  }
+
+  /**
+   * Remove classes from the given element.
+   * @param {Element} element - The target element.
+   * @param {string} value - The classes to be removed.
+   */
+  function removeClass(element, value) {
+    if (!element || !value) {
+      return;
+    }
+    if (isNumber(element.length)) {
+      forEach(element, function (elem) {
+        removeClass(elem, value);
+      });
+      return;
+    }
+    if (element.classList) {
+      element.classList.remove(value);
+      return;
+    }
+    if (element.className.indexOf(value) >= 0) {
+      element.className = element.className.replace(value, '');
+    }
+  }
+
+  /**
+   * Add or remove classes from the given element.
+   * @param {Element} element - The target element.
+   * @param {string} value - The classes to be toggled.
+   * @param {boolean} added - Add only.
+   */
+  function toggleClass(element, value, added) {
+    if (!value) {
+      return;
+    }
+    if (isNumber(element.length)) {
+      forEach(element, function (elem) {
+        toggleClass(elem, value, added);
+      });
+      return;
+    }
+
+    // IE10-11 doesn't support the second parameter of `classList.toggle`
+    if (added) {
+      addClass(element, value);
+    } else {
+      removeClass(element, value);
+    }
+  }
+  var REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;
+
+  /**
+   * Transform the given string from camelCase to kebab-case
+   * @param {string} value - The value to transform.
+   * @returns {string} The transformed value.
+   */
+  function hyphenate(value) {
+    return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
+  }
+
+  /**
+   * Get data from the given element.
+   * @param {Element} element - The target element.
+   * @param {string} name - The data key to get.
+   * @returns {string} The data value.
+   */
+  function getData(element, name) {
+    if (isObject(element[name])) {
+      return element[name];
+    }
+    if (element.dataset) {
+      return element.dataset[name];
+    }
+    return element.getAttribute("data-".concat(hyphenate(name)));
+  }
+
+  /**
+   * Set data to the given element.
+   * @param {Element} element - The target element.
+   * @param {string} name - The data key to set.
+   * @param {string} data - The data value.
+   */
+  function setData(element, name, data) {
+    if (isObject(data)) {
+      element[name] = data;
+    } else if (element.dataset) {
+      element.dataset[name] = data;
+    } else {
+      element.setAttribute("data-".concat(hyphenate(name)), data);
+    }
+  }
+  var onceSupported = function () {
+    var supported = false;
+    if (IS_BROWSER) {
+      var once = false;
+      var listener = function listener() {};
+      var options = Object.defineProperty({}, 'once', {
+        get: function get() {
+          supported = true;
+          return once;
+        },
+        /**
+         * This setter can fix a `TypeError` in strict mode
+         * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only}
+         * @param {boolean} value - The value to set
+         */
+        set: function set(value) {
+          once = value;
+        }
+      });
+      WINDOW.addEventListener('test', listener, options);
+      WINDOW.removeEventListener('test', listener, options);
+    }
+    return supported;
+  }();
+
+  /**
+   * Remove event listener from the target element.
+   * @param {Element} element - The event target.
+   * @param {string} type - The event type(s).
+   * @param {Function} listener - The event listener.
+   * @param {Object} options - The event options.
+   */
+  function removeListener(element, type, listener) {
+    var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
+    var handler = listener;
+    type.trim().split(REGEXP_SPACES).forEach(function (event) {
+      if (!onceSupported) {
+        var listeners = element.listeners;
+        if (listeners && listeners[event] && listeners[event][listener]) {
+          handler = listeners[event][listener];
+          delete listeners[event][listener];
+          if (Object.keys(listeners[event]).length === 0) {
+            delete listeners[event];
+          }
+          if (Object.keys(listeners).length === 0) {
+            delete element.listeners;
+          }
+        }
+      }
+      element.removeEventListener(event, handler, options);
+    });
+  }
+
+  /**
+   * Add event listener to the target element.
+   * @param {Element} element - The event target.
+   * @param {string} type - The event type(s).
+   * @param {Function} listener - The event listener.
+   * @param {Object} options - The event options.
+   */
+  function addListener(element, type, listener) {
+    var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
+    var _handler = listener;
+    type.trim().split(REGEXP_SPACES).forEach(function (event) {
+      if (options.once && !onceSupported) {
+        var _element$listeners = element.listeners,
+          listeners = _element$listeners === void 0 ? {} : _element$listeners;
+        _handler = function handler() {
+          delete listeners[event][listener];
+          element.removeEventListener(event, _handler, options);
+          for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+            args[_key2] = arguments[_key2];
+          }
+          listener.apply(element, args);
+        };
+        if (!listeners[event]) {
+          listeners[event] = {};
+        }
+        if (listeners[event][listener]) {
+          element.removeEventListener(event, listeners[event][listener], options);
+        }
+        listeners[event][listener] = _handler;
+        element.listeners = listeners;
+      }
+      element.addEventListener(event, _handler, options);
+    });
+  }
+
+  /**
+   * Dispatch event on the target element.
+   * @param {Element} element - The event target.
+   * @param {string} type - The event type(s).
+   * @param {Object} data - The additional event data.
+   * @param {Object} options - The additional event options.
+   * @returns {boolean} Indicate if the event is default prevented or not.
+   */
+  function dispatchEvent(element, type, data, options) {
+    var event;
+
+    // Event and CustomEvent on IE9-11 are global objects, not constructors
+    if (isFunction(Event) && isFunction(CustomEvent)) {
+      event = new CustomEvent(type, _objectSpread2({
+        bubbles: true,
+        cancelable: true,
+        detail: data
+      }, options));
+    } else {
+      event = document.createEvent('CustomEvent');
+      event.initCustomEvent(type, true, true, data);
+    }
+    return element.dispatchEvent(event);
+  }
+
+  /**
+   * Get the offset base on the document.
+   * @param {Element} element - The target element.
+   * @returns {Object} The offset data.
+   */
+  function getOffset(element) {
+    var box = element.getBoundingClientRect();
+    return {
+      left: box.left + (window.pageXOffset - document.documentElement.clientLeft),
+      top: box.top + (window.pageYOffset - document.documentElement.clientTop)
+    };
+  }
+
+  /**
+   * Get transforms base on the given object.
+   * @param {Object} obj - The target object.
+   * @returns {string} A string contains transform values.
+   */
+  function getTransforms(_ref) {
+    var rotate = _ref.rotate,
+      scaleX = _ref.scaleX,
+      scaleY = _ref.scaleY,
+      translateX = _ref.translateX,
+      translateY = _ref.translateY;
+    var values = [];
+    if (isNumber(translateX) && translateX !== 0) {
+      values.push("translateX(".concat(translateX, "px)"));
+    }
+    if (isNumber(translateY) && translateY !== 0) {
+      values.push("translateY(".concat(translateY, "px)"));
+    }
+
+    // Rotate should come first before scale to match orientation transform
+    if (isNumber(rotate) && rotate !== 0) {
+      values.push("rotate(".concat(rotate, "deg)"));
+    }
+    if (isNumber(scaleX) && scaleX !== 1) {
+      values.push("scaleX(".concat(scaleX, ")"));
+    }
+    if (isNumber(scaleY) && scaleY !== 1) {
+      values.push("scaleY(".concat(scaleY, ")"));
+    }
+    var transform = values.length ? values.join(' ') : 'none';
+    return {
+      WebkitTransform: transform,
+      msTransform: transform,
+      transform: transform
+    };
+  }
+
+  /**
+   * Get an image name from an image url.
+   * @param {string} url - The target url.
+   * @example
+   * // picture.jpg
+   * getImageNameFromURL('https://domain.com/path/to/picture.jpg?size=1280×960')
+   * @returns {string} A string contains the image name.
+   */
+  function getImageNameFromURL(url) {
+    return isString(url) ? decodeURIComponent(url.replace(/^.*\//, '').replace(/[?&#].*$/, '')) : '';
+  }
+  var IS_SAFARI = WINDOW.navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(WINDOW.navigator.userAgent);
+
+  /**
+   * Get an image's natural sizes.
+   * @param {string} image - The target image.
+   * @param {Object} options - The viewer options.
+   * @param {Function} callback - The callback function.
+   * @returns {HTMLImageElement} The new image.
+   */
+  function getImageNaturalSizes(image, options, callback) {
+    var newImage = document.createElement('img');
+
+    // Modern browsers (except Safari)
+    if (image.naturalWidth && !IS_SAFARI) {
+      callback(image.naturalWidth, image.naturalHeight);
+      return newImage;
+    }
+    var body = document.body || document.documentElement;
+    newImage.onload = function () {
+      callback(newImage.width, newImage.height);
+      if (!IS_SAFARI) {
+        body.removeChild(newImage);
+      }
+    };
+    forEach(options.inheritedAttributes, function (name) {
+      var value = image.getAttribute(name);
+      if (value !== null) {
+        newImage.setAttribute(name, value);
+      }
+    });
+    newImage.src = image.src;
+
+    // iOS Safari will convert the image automatically
+    // with its orientation once append it into DOM
+    if (!IS_SAFARI) {
+      newImage.style.cssText = 'left:0;' + 'max-height:none!important;' + 'max-width:none!important;' + 'min-height:0!important;' + 'min-width:0!important;' + 'opacity:0;' + 'position:absolute;' + 'top:0;' + 'z-index:-1;';
+      body.appendChild(newImage);
+    }
+    return newImage;
+  }
+
+  /**
+   * Get the related class name of a responsive type number.
+   * @param {string} type - The responsive type.
+   * @returns {string} The related class name.
+   */
+  function getResponsiveClass(type) {
+    switch (type) {
+      case 2:
+        return CLASS_HIDE_XS_DOWN;
+      case 3:
+        return CLASS_HIDE_SM_DOWN;
+      case 4:
+        return CLASS_HIDE_MD_DOWN;
+      default:
+        return '';
+    }
+  }
+
+  /**
+   * Get the max ratio of a group of pointers.
+   * @param {string} pointers - The target pointers.
+   * @returns {number} The result ratio.
+   */
+  function getMaxZoomRatio(pointers) {
+    var pointers2 = _objectSpread2({}, pointers);
+    var ratios = [];
+    forEach(pointers, function (pointer, pointerId) {
+      delete pointers2[pointerId];
+      forEach(pointers2, function (pointer2) {
+        var x1 = Math.abs(pointer.startX - pointer2.startX);
+        var y1 = Math.abs(pointer.startY - pointer2.startY);
+        var x2 = Math.abs(pointer.endX - pointer2.endX);
+        var y2 = Math.abs(pointer.endY - pointer2.endY);
+        var z1 = Math.sqrt(x1 * x1 + y1 * y1);
+        var z2 = Math.sqrt(x2 * x2 + y2 * y2);
+        var ratio = (z2 - z1) / z1;
+        ratios.push(ratio);
+      });
+    });
+    ratios.sort(function (a, b) {
+      return Math.abs(a) < Math.abs(b);
+    });
+    return ratios[0];
+  }
+
+  /**
+   * Get a pointer from an event object.
+   * @param {Object} event - The target event object.
+   * @param {boolean} endOnly - Indicates if only returns the end point coordinate or not.
+   * @returns {Object} The result pointer contains start and/or end point coordinates.
+   */
+  function getPointer(_ref2, endOnly) {
+    var pageX = _ref2.pageX,
+      pageY = _ref2.pageY;
+    var end = {
+      endX: pageX,
+      endY: pageY
+    };
+    return endOnly ? end : _objectSpread2({
+      timeStamp: Date.now(),
+      startX: pageX,
+      startY: pageY
+    }, end);
+  }
+
+  /**
+   * Get the center point coordinate of a group of pointers.
+   * @param {Object} pointers - The target pointers.
+   * @returns {Object} The center point coordinate.
+   */
+  function getPointersCenter(pointers) {
+    var pageX = 0;
+    var pageY = 0;
+    var count = 0;
+    forEach(pointers, function (_ref3) {
+      var startX = _ref3.startX,
+        startY = _ref3.startY;
+      pageX += startX;
+      pageY += startY;
+      count += 1;
+    });
+    pageX /= count;
+    pageY /= count;
+    return {
+      pageX: pageX,
+      pageY: pageY
+    };
+  }
+
+  var render = {
+    render: function render() {
+      this.initContainer();
+      this.initViewer();
+      this.initList();
+      this.renderViewer();
+    },
+    initBody: function initBody() {
+      var ownerDocument = this.element.ownerDocument;
+      var body = ownerDocument.body || ownerDocument.documentElement;
+      this.body = body;
+      this.scrollbarWidth = window.innerWidth - ownerDocument.documentElement.clientWidth;
+      this.initialBodyPaddingRight = body.style.paddingRight;
+      this.initialBodyComputedPaddingRight = window.getComputedStyle(body).paddingRight;
+    },
+    initContainer: function initContainer() {
+      this.containerData = {
+        width: window.innerWidth,
+        height: window.innerHeight
+      };
+    },
+    initViewer: function initViewer() {
+      var options = this.options,
+        parent = this.parent;
+      var viewerData;
+      if (options.inline) {
+        viewerData = {
+          width: Math.max(parent.offsetWidth, options.minWidth),
+          height: Math.max(parent.offsetHeight, options.minHeight)
+        };
+        this.parentData = viewerData;
+      }
+      if (this.fulled || !viewerData) {
+        viewerData = this.containerData;
+      }
+      this.viewerData = assign({}, viewerData);
+    },
+    renderViewer: function renderViewer() {
+      if (this.options.inline && !this.fulled) {
+        setStyle(this.viewer, this.viewerData);
+      }
+    },
+    initList: function initList() {
+      var _this = this;
+      var element = this.element,
+        options = this.options,
+        list = this.list;
+      var items = [];
+
+      // initList may be called in this.update, so should keep idempotent
+      list.innerHTML = '';
+      forEach(this.images, function (image, index) {
+        var src = image.src;
+        var alt = image.alt || getImageNameFromURL(src);
+        var url = _this.getImageURL(image);
+        if (src || url) {
+          var item = document.createElement('li');
+          var img = document.createElement('img');
+          forEach(options.inheritedAttributes, function (name) {
+            var value = image.getAttribute(name);
+            if (value !== null) {
+              img.setAttribute(name, value);
+            }
+          });
+          if (options.navbar) {
+            img.src = src || url;
+          }
+          img.alt = alt;
+          img.setAttribute('data-original-url', url || src);
+          item.setAttribute('data-index', index);
+          item.setAttribute('data-viewer-action', 'view');
+          item.setAttribute('role', 'button');
+          if (options.keyboard) {
+            item.setAttribute('tabindex', 0);
+          }
+          item.appendChild(img);
+          list.appendChild(item);
+          items.push(item);
+        }
+      });
+      this.items = items;
+      forEach(items, function (item) {
+        var image = item.firstElementChild;
+        var onLoad;
+        var onError;
+        setData(image, 'filled', true);
+        if (options.loading) {
+          addClass(item, CLASS_LOADING);
+        }
+        addListener(image, EVENT_LOAD, onLoad = function onLoad(event) {
+          removeListener(image, EVENT_ERROR, onError);
+          if (options.loading) {
+            removeClass(item, CLASS_LOADING);
+          }
+          _this.loadImage(event);
+        }, {
+          once: true
+        });
+        addListener(image, EVENT_ERROR, onError = function onError() {
+          removeListener(image, EVENT_LOAD, onLoad);
+          if (options.loading) {
+            removeClass(item, CLASS_LOADING);
+          }
+        }, {
+          once: true
+        });
+      });
+      if (options.transition) {
+        addListener(element, EVENT_VIEWED, function () {
+          addClass(list, CLASS_TRANSITION);
+        }, {
+          once: true
+        });
+      }
+    },
+    renderList: function renderList() {
+      var index = this.index;
+      var item = this.items[index];
+      if (!item) {
+        return;
+      }
+      var next = item.nextElementSibling;
+      var gutter = parseInt(window.getComputedStyle(next || item).marginLeft, 10);
+      var offsetWidth = item.offsetWidth;
+      var outerWidth = offsetWidth + gutter;
+
+      // Place the active item in the center of the screen
+      setStyle(this.list, assign({
+        width: outerWidth * this.length - gutter
+      }, getTransforms({
+        translateX: (this.viewerData.width - offsetWidth) / 2 - outerWidth * index
+      })));
+    },
+    resetList: function resetList() {
+      var list = this.list;
+      list.innerHTML = '';
+      removeClass(list, CLASS_TRANSITION);
+      setStyle(list, getTransforms({
+        translateX: 0
+      }));
+    },
+    initImage: function initImage(done) {
+      var _this2 = this;
+      var options = this.options,
+        image = this.image,
+        viewerData = this.viewerData;
+      var footerHeight = this.footer.offsetHeight;
+      var viewerWidth = viewerData.width;
+      var viewerHeight = Math.max(viewerData.height - footerHeight, footerHeight);
+      var oldImageData = this.imageData || {};
+      var sizingImage;
+      this.imageInitializing = {
+        abort: function abort() {
+          sizingImage.onload = null;
+        }
+      };
+      sizingImage = getImageNaturalSizes(image, options, function (naturalWidth, naturalHeight) {
+        var aspectRatio = naturalWidth / naturalHeight;
+        var initialCoverage = Math.max(0, Math.min(1, options.initialCoverage));
+        var width = viewerWidth;
+        var height = viewerHeight;
+        _this2.imageInitializing = false;
+        if (viewerHeight * aspectRatio > viewerWidth) {
+          height = viewerWidth / aspectRatio;
+        } else {
+          width = viewerHeight * aspectRatio;
+        }
+        initialCoverage = isNumber(initialCoverage) ? initialCoverage : 0.9;
+        width = Math.min(width * initialCoverage, naturalWidth);
+        height = Math.min(height * initialCoverage, naturalHeight);
+        var left = (viewerWidth - width) / 2;
+        var top = (viewerHeight - height) / 2;
+        var imageData = {
+          left: left,
+          top: top,
+          x: left,
+          y: top,
+          width: width,
+          height: height,
+          oldRatio: 1,
+          ratio: width / naturalWidth,
+          aspectRatio: aspectRatio,
+          naturalWidth: naturalWidth,
+          naturalHeight: naturalHeight
+        };
+        var initialImageData = assign({}, imageData);
+        if (options.rotatable) {
+          imageData.rotate = oldImageData.rotate || 0;
+          initialImageData.rotate = 0;
+        }
+        if (options.scalable) {
+          imageData.scaleX = oldImageData.scaleX || 1;
+          imageData.scaleY = oldImageData.scaleY || 1;
+          initialImageData.scaleX = 1;
+          initialImageData.scaleY = 1;
+        }
+        _this2.imageData = imageData;
+        _this2.initialImageData = initialImageData;
+        if (done) {
+          done();
+        }
+      });
+    },
+    renderImage: function renderImage(done) {
+      var _this3 = this;
+      var image = this.image,
+        imageData = this.imageData;
+      setStyle(image, assign({
+        width: imageData.width,
+        height: imageData.height,
+        // XXX: Not to use translateX/Y to avoid image shaking when zooming
+        marginLeft: imageData.x,
+        marginTop: imageData.y
+      }, getTransforms(imageData)));
+      if (done) {
+        if ((this.viewing || this.moving || this.rotating || this.scaling || this.zooming) && this.options.transition && hasClass(image, CLASS_TRANSITION)) {
+          var onTransitionEnd = function onTransitionEnd() {
+            _this3.imageRendering = false;
+            done();
+          };
+          this.imageRendering = {
+            abort: function abort() {
+              removeListener(image, EVENT_TRANSITION_END, onTransitionEnd);
+            }
+          };
+          addListener(image, EVENT_TRANSITION_END, onTransitionEnd, {
+            once: true
+          });
+        } else {
+          done();
+        }
+      }
+    },
+    resetImage: function resetImage() {
+      // this.image only defined after viewed
+      if (this.viewing || this.viewed) {
+        var image = this.image;
+        if (this.viewing) {
+          this.viewing.abort();
+        }
+        image.parentNode.removeChild(image);
+        this.image = null;
+      }
+    }
+  };
+
+  var events = {
+    bind: function bind() {
+      var options = this.options,
+        viewer = this.viewer,
+        canvas = this.canvas;
+      var document = this.element.ownerDocument;
+      addListener(viewer, EVENT_CLICK, this.onClick = this.click.bind(this));
+      addListener(viewer, EVENT_DRAG_START, this.onDragStart = this.dragstart.bind(this));
+      addListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown = this.pointerdown.bind(this));
+      addListener(document, EVENT_POINTER_MOVE, this.onPointerMove = this.pointermove.bind(this));
+      addListener(document, EVENT_POINTER_UP, this.onPointerUp = this.pointerup.bind(this));
+      addListener(document, EVENT_KEY_DOWN, this.onKeyDown = this.keydown.bind(this));
+      addListener(window, EVENT_RESIZE, this.onResize = this.resize.bind(this));
+      if (options.zoomable && options.zoomOnWheel) {
+        addListener(viewer, EVENT_WHEEL, this.onWheel = this.wheel.bind(this), {
+          passive: false,
+          capture: true
+        });
+      }
+      if (options.toggleOnDblclick) {
+        addListener(canvas, EVENT_DBLCLICK, this.onDblclick = this.dblclick.bind(this));
+      }
+    },
+    unbind: function unbind() {
+      var options = this.options,
+        viewer = this.viewer,
+        canvas = this.canvas;
+      var document = this.element.ownerDocument;
+      removeListener(viewer, EVENT_CLICK, this.onClick);
+      removeListener(viewer, EVENT_DRAG_START, this.onDragStart);
+      removeListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown);
+      removeListener(document, EVENT_POINTER_MOVE, this.onPointerMove);
+      removeListener(document, EVENT_POINTER_UP, this.onPointerUp);
+      removeListener(document, EVENT_KEY_DOWN, this.onKeyDown);
+      removeListener(window, EVENT_RESIZE, this.onResize);
+      if (options.zoomable && options.zoomOnWheel) {
+        removeListener(viewer, EVENT_WHEEL, this.onWheel, {
+          passive: false,
+          capture: true
+        });
+      }
+      if (options.toggleOnDblclick) {
+        removeListener(canvas, EVENT_DBLCLICK, this.onDblclick);
+      }
+    }
+  };
+
+  var handlers = {
+    click: function click(event) {
+      var options = this.options,
+        imageData = this.imageData;
+      var target = event.target;
+      var action = getData(target, DATA_ACTION);
+      if (!action && target.localName === 'img' && target.parentElement.localName === 'li') {
+        target = target.parentElement;
+        action = getData(target, DATA_ACTION);
+      }
+
+      // Cancel the emulated click when the native click event was triggered.
+      if (IS_TOUCH_DEVICE && event.isTrusted && target === this.canvas) {
+        clearTimeout(this.clickCanvasTimeout);
+      }
+      switch (action) {
+        case 'mix':
+          if (this.played) {
+            this.stop();
+          } else if (options.inline) {
+            if (this.fulled) {
+              this.exit();
+            } else {
+              this.full();
+            }
+          } else {
+            this.hide();
+          }
+          break;
+        case 'hide':
+          if (!this.pointerMoved) {
+            this.hide();
+          }
+          break;
+        case 'view':
+          this.view(getData(target, 'index'));
+          break;
+        case 'zoom-in':
+          this.zoom(0.1, true);
+          break;
+        case 'zoom-out':
+          this.zoom(-0.1, true);
+          break;
+        case 'one-to-one':
+          this.toggle();
+          break;
+        case 'reset':
+          this.reset();
+          break;
+        case 'prev':
+          this.prev(options.loop);
+          break;
+        case 'play':
+          this.play(options.fullscreen);
+          break;
+        case 'next':
+          this.next(options.loop);
+          break;
+        case 'rotate-left':
+          this.rotate(-90);
+          break;
+        case 'rotate-right':
+          this.rotate(90);
+          break;
+        case 'flip-horizontal':
+          this.scaleX(-imageData.scaleX || -1);
+          break;
+        case 'flip-vertical':
+          this.scaleY(-imageData.scaleY || -1);
+          break;
+        default:
+          if (this.played) {
+            this.stop();
+          }
+      }
+    },
+    dblclick: function dblclick(event) {
+      event.preventDefault();
+      if (this.viewed && event.target === this.image) {
+        // Cancel the emulated double click when the native dblclick event was triggered.
+        if (IS_TOUCH_DEVICE && event.isTrusted) {
+          clearTimeout(this.doubleClickImageTimeout);
+        }
+
+        // XXX: No pageX/Y properties in custom event, fallback to the original event.
+        this.toggle(event.isTrusted ? event : event.detail && event.detail.originalEvent);
+      }
+    },
+    load: function load() {
+      var _this = this;
+      if (this.timeout) {
+        clearTimeout(this.timeout);
+        this.timeout = false;
+      }
+      var element = this.element,
+        options = this.options,
+        image = this.image,
+        index = this.index,
+        viewerData = this.viewerData;
+      removeClass(image, CLASS_INVISIBLE);
+      if (options.loading) {
+        removeClass(this.canvas, CLASS_LOADING);
+      }
+      image.style.cssText = 'height:0;' + "margin-left:".concat(viewerData.width / 2, "px;") + "margin-top:".concat(viewerData.height / 2, "px;") + 'max-width:none!important;' + 'position:relative;' + 'width:0;';
+      this.initImage(function () {
+        toggleClass(image, CLASS_MOVE, options.movable);
+        toggleClass(image, CLASS_TRANSITION, options.transition);
+        _this.renderImage(function () {
+          _this.viewed = true;
+          _this.viewing = false;
+          if (isFunction(options.viewed)) {
+            addListener(element, EVENT_VIEWED, options.viewed, {
+              once: true
+            });
+          }
+          dispatchEvent(element, EVENT_VIEWED, {
+            originalImage: _this.images[index],
+            index: index,
+            image: image
+          }, {
+            cancelable: false
+          });
+        });
+      });
+    },
+    loadImage: function loadImage(event) {
+      var image = event.target;
+      var parent = image.parentNode;
+      var parentWidth = parent.offsetWidth || 30;
+      var parentHeight = parent.offsetHeight || 50;
+      var filled = !!getData(image, 'filled');
+      getImageNaturalSizes(image, this.options, function (naturalWidth, naturalHeight) {
+        var aspectRatio = naturalWidth / naturalHeight;
+        var width = parentWidth;
+        var height = parentHeight;
+        if (parentHeight * aspectRatio > parentWidth) {
+          if (filled) {
+            width = parentHeight * aspectRatio;
+          } else {
+            height = parentWidth / aspectRatio;
+          }
+        } else if (filled) {
+          height = parentWidth / aspectRatio;
+        } else {
+          width = parentHeight * aspectRatio;
+        }
+        setStyle(image, assign({
+          width: width,
+          height: height
+        }, getTransforms({
+          translateX: (parentWidth - width) / 2,
+          translateY: (parentHeight - height) / 2
+        })));
+      });
+    },
+    keydown: function keydown(event) {
+      var options = this.options;
+      if (!options.keyboard) {
+        return;
+      }
+      var keyCode = event.keyCode || event.which || event.charCode;
+      switch (keyCode) {
+        // Enter
+        case 13:
+          if (this.viewer.contains(event.target)) {
+            this.click(event);
+          }
+          break;
+      }
+      if (!this.fulled) {
+        return;
+      }
+      switch (keyCode) {
+        // Escape
+        case 27:
+          if (this.played) {
+            this.stop();
+          } else if (options.inline) {
+            if (this.fulled) {
+              this.exit();
+            }
+          } else {
+            this.hide();
+          }
+          break;
+
+        // Space
+        case 32:
+          if (this.played) {
+            this.stop();
+          }
+          break;
+
+        // ArrowLeft
+        case 37:
+          if (this.played && this.playing) {
+            this.playing.prev();
+          } else {
+            this.prev(options.loop);
+          }
+          break;
+
+        // ArrowUp
+        case 38:
+          // Prevent scroll on Firefox
+          event.preventDefault();
+
+          // Zoom in
+          this.zoom(options.zoomRatio, true);
+          break;
+
+        // ArrowRight
+        case 39:
+          if (this.played && this.playing) {
+            this.playing.next();
+          } else {
+            this.next(options.loop);
+          }
+          break;
+
+        // ArrowDown
+        case 40:
+          // Prevent scroll on Firefox
+          event.preventDefault();
+
+          // Zoom out
+          this.zoom(-options.zoomRatio, true);
+          break;
+
+        // Ctrl + 0
+        case 48:
+        // Fall through
+
+        // Ctrl + 1
+        // eslint-disable-next-line no-fallthrough
+        case 49:
+          if (event.ctrlKey) {
+            event.preventDefault();
+            this.toggle();
+          }
+          break;
+      }
+    },
+    dragstart: function dragstart(event) {
+      if (event.target.localName === 'img') {
+        event.preventDefault();
+      }
+    },
+    pointerdown: function pointerdown(event) {
+      var options = this.options,
+        pointers = this.pointers;
+      var buttons = event.buttons,
+        button = event.button;
+      this.pointerMoved = false;
+      if (!this.viewed || this.showing || this.viewing || this.hiding
+
+      // Handle mouse event and pointer event and ignore touch event
+      || (event.type === 'mousedown' || event.type === 'pointerdown' && event.pointerType === 'mouse') && (
+      // No primary button (Usually the left button)
+      isNumber(buttons) && buttons !== 1 || isNumber(button) && button !== 0
+
+      // Open context menu
+      || event.ctrlKey)) {
+        return;
+      }
+
+      // Prevent default behaviours as page zooming in touch devices.
+      event.preventDefault();
+      if (event.changedTouches) {
+        forEach(event.changedTouches, function (touch) {
+          pointers[touch.identifier] = getPointer(touch);
+        });
+      } else {
+        pointers[event.pointerId || 0] = getPointer(event);
+      }
+      var action = options.movable ? ACTION_MOVE : false;
+      if (options.zoomOnTouch && options.zoomable && Object.keys(pointers).length > 1) {
+        action = ACTION_ZOOM;
+      } else if (options.slideOnTouch && (event.pointerType === 'touch' || event.type === 'touchstart') && this.isSwitchable()) {
+        action = ACTION_SWITCH;
+      }
+      if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
+        removeClass(this.image, CLASS_TRANSITION);
+      }
+      this.action = action;
+    },
+    pointermove: function pointermove(event) {
+      var pointers = this.pointers,
+        action = this.action;
+      if (!this.viewed || !action) {
+        return;
+      }
+      event.preventDefault();
+      this.pointerMoved = true;
+      if (event.changedTouches) {
+        forEach(event.changedTouches, function (touch) {
+          assign(pointers[touch.identifier] || {}, getPointer(touch, true));
+        });
+      } else {
+        assign(pointers[event.pointerId || 0] || {}, getPointer(event, true));
+      }
+      this.change(event);
+    },
+    pointerup: function pointerup(event) {
+      var _this2 = this;
+      var options = this.options,
+        action = this.action,
+        pointers = this.pointers;
+      var pointer;
+      if (event.changedTouches) {
+        forEach(event.changedTouches, function (touch) {
+          pointer = pointers[touch.identifier];
+          delete pointers[touch.identifier];
+        });
+      } else {
+        pointer = pointers[event.pointerId || 0];
+        delete pointers[event.pointerId || 0];
+      }
+      if (!action) {
+        return;
+      }
+      event.preventDefault();
+      if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
+        addClass(this.image, CLASS_TRANSITION);
+      }
+      this.action = false;
+
+      // Emulate click and double click in touch devices to support backdrop and image zooming (#210).
+      if (IS_TOUCH_DEVICE && action !== ACTION_ZOOM && pointer && Date.now() - pointer.timeStamp < 500) {
+        clearTimeout(this.clickCanvasTimeout);
+        clearTimeout(this.doubleClickImageTimeout);
+        if (options.toggleOnDblclick && this.viewed && event.target === this.image) {
+          if (this.imageClicked) {
+            this.imageClicked = false;
+
+            // This timeout will be cleared later when a native dblclick event is triggering
+            this.doubleClickImageTimeout = setTimeout(function () {
+              dispatchEvent(_this2.image, EVENT_DBLCLICK, {
+                originalEvent: event
+              });
+            }, 50);
+          } else {
+            this.imageClicked = true;
+
+            // The default timing of a double click in Windows is 500 ms
+            this.doubleClickImageTimeout = setTimeout(function () {
+              _this2.imageClicked = false;
+            }, 500);
+          }
+        } else {
+          this.imageClicked = false;
+          if (options.backdrop && options.backdrop !== 'static' && event.target === this.canvas) {
+            // This timeout will be cleared later when a native click event is triggering
+            this.clickCanvasTimeout = setTimeout(function () {
+              dispatchEvent(_this2.canvas, EVENT_CLICK, {
+                originalEvent: event
+              });
+            }, 50);
+          }
+        }
+      }
+    },
+    resize: function resize() {
+      var _this3 = this;
+      if (!this.isShown || this.hiding) {
+        return;
+      }
+      if (this.fulled) {
+        this.close();
+        this.initBody();
+        this.open();
+      }
+      this.initContainer();
+      this.initViewer();
+      this.renderViewer();
+      this.renderList();
+      if (this.viewed) {
+        this.initImage(function () {
+          _this3.renderImage();
+        });
+      }
+      if (this.played) {
+        if (this.options.fullscreen && this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+          this.stop();
+          return;
+        }
+        forEach(this.player.getElementsByTagName('img'), function (image) {
+          addListener(image, EVENT_LOAD, _this3.loadImage.bind(_this3), {
+            once: true
+          });
+          dispatchEvent(image, EVENT_LOAD);
+        });
+      }
+    },
+    wheel: function wheel(event) {
+      var _this4 = this;
+      if (!this.viewed) {
+        return;
+      }
+      event.preventDefault();
+
+      // Limit wheel speed to prevent zoom too fast
+      if (this.wheeling) {
+        return;
+      }
+      this.wheeling = true;
+      setTimeout(function () {
+        _this4.wheeling = false;
+      }, 50);
+      var ratio = Number(this.options.zoomRatio) || 0.1;
+      var delta = 1;
+      if (event.deltaY) {
+        delta = event.deltaY > 0 ? 1 : -1;
+      } else if (event.wheelDelta) {
+        delta = -event.wheelDelta / 120;
+      } else if (event.detail) {
+        delta = event.detail > 0 ? 1 : -1;
+      }
+      this.zoom(-delta * ratio, true, null, event);
+    }
+  };
+
+  var methods = {
+    /** Show the viewer (only available in modal mode)
+     * @param {boolean} [immediate=false] - Indicates if show the viewer immediately or not.
+     * @returns {Viewer} this
+     */
+    show: function show() {
+      var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+      var element = this.element,
+        options = this.options;
+      if (options.inline || this.showing || this.isShown || this.showing) {
+        return this;
+      }
+      if (!this.ready) {
+        this.build();
+        if (this.ready) {
+          this.show(immediate);
+        }
+        return this;
+      }
+      if (isFunction(options.show)) {
+        addListener(element, EVENT_SHOW, options.show, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_SHOW) === false || !this.ready) {
+        return this;
+      }
+      if (this.hiding) {
+        this.transitioning.abort();
+      }
+      this.showing = true;
+      this.open();
+      var viewer = this.viewer;
+      removeClass(viewer, CLASS_HIDE);
+      viewer.setAttribute('role', 'dialog');
+      viewer.setAttribute('aria-labelledby', this.title.id);
+      viewer.setAttribute('aria-modal', true);
+      viewer.removeAttribute('aria-hidden');
+      if (options.transition && !immediate) {
+        var shown = this.shown.bind(this);
+        this.transitioning = {
+          abort: function abort() {
+            removeListener(viewer, EVENT_TRANSITION_END, shown);
+            removeClass(viewer, CLASS_IN);
+          }
+        };
+        addClass(viewer, CLASS_TRANSITION);
+
+        // Force reflow to enable CSS3 transition
+        viewer.initialOffsetWidth = viewer.offsetWidth;
+        addListener(viewer, EVENT_TRANSITION_END, shown, {
+          once: true
+        });
+        addClass(viewer, CLASS_IN);
+      } else {
+        addClass(viewer, CLASS_IN);
+        this.shown();
+      }
+      return this;
+    },
+    /**
+     * Hide the viewer (only available in modal mode)
+     * @param {boolean} [immediate=false] - Indicates if hide the viewer immediately or not.
+     * @returns {Viewer} this
+     */
+    hide: function hide() {
+      var _this = this;
+      var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+      var element = this.element,
+        options = this.options;
+      if (options.inline || this.hiding || !(this.isShown || this.showing)) {
+        return this;
+      }
+      if (isFunction(options.hide)) {
+        addListener(element, EVENT_HIDE, options.hide, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_HIDE) === false) {
+        return this;
+      }
+      if (this.showing) {
+        this.transitioning.abort();
+      }
+      this.hiding = true;
+      if (this.played) {
+        this.stop();
+      } else if (this.viewing) {
+        this.viewing.abort();
+      }
+      var viewer = this.viewer,
+        image = this.image;
+      var hideImmediately = function hideImmediately() {
+        removeClass(viewer, CLASS_IN);
+        _this.hidden();
+      };
+      if (options.transition && !immediate) {
+        var onViewerTransitionEnd = function onViewerTransitionEnd(event) {
+          // Ignore all propagating `transitionend` events (#275).
+          if (event && event.target === viewer) {
+            removeListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
+            _this.hidden();
+          }
+        };
+        var onImageTransitionEnd = function onImageTransitionEnd() {
+          // In case of show the viewer by `viewer.show(true)` previously (#407).
+          if (hasClass(viewer, CLASS_TRANSITION)) {
+            addListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
+            removeClass(viewer, CLASS_IN);
+          } else {
+            hideImmediately();
+          }
+        };
+        this.transitioning = {
+          abort: function abort() {
+            if (_this.viewed && hasClass(image, CLASS_TRANSITION)) {
+              removeListener(image, EVENT_TRANSITION_END, onImageTransitionEnd);
+            } else if (hasClass(viewer, CLASS_TRANSITION)) {
+              removeListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
+            }
+          }
+        };
+
+        // In case of hiding the viewer when holding on the image (#255),
+        // note that the `CLASS_TRANSITION` class will be removed on pointer down.
+        if (this.viewed && hasClass(image, CLASS_TRANSITION)) {
+          addListener(image, EVENT_TRANSITION_END, onImageTransitionEnd, {
+            once: true
+          });
+          this.zoomTo(0, false, null, null, true);
+        } else {
+          onImageTransitionEnd();
+        }
+      } else {
+        hideImmediately();
+      }
+      return this;
+    },
+    /**
+     * View one of the images with image's index
+     * @param {number} index - The index of the image to view.
+     * @returns {Viewer} this
+     */
+    view: function view() {
+      var _this2 = this;
+      var index = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.options.initialViewIndex;
+      index = Number(index) || 0;
+      if (this.hiding || this.played || index < 0 || index >= this.length || this.viewed && index === this.index) {
+        return this;
+      }
+      if (!this.isShown) {
+        this.index = index;
+        return this.show();
+      }
+      if (this.viewing) {
+        this.viewing.abort();
+      }
+      var element = this.element,
+        options = this.options,
+        title = this.title,
+        canvas = this.canvas;
+      var item = this.items[index];
+      var img = item.querySelector('img');
+      var url = getData(img, 'originalUrl');
+      var alt = img.getAttribute('alt');
+      var image = document.createElement('img');
+      forEach(options.inheritedAttributes, function (name) {
+        var value = img.getAttribute(name);
+        if (value !== null) {
+          image.setAttribute(name, value);
+        }
+      });
+      image.src = url;
+      image.alt = alt;
+      if (isFunction(options.view)) {
+        addListener(element, EVENT_VIEW, options.view, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_VIEW, {
+        originalImage: this.images[index],
+        index: index,
+        image: image
+      }) === false || !this.isShown || this.hiding || this.played) {
+        return this;
+      }
+      var activeItem = this.items[this.index];
+      if (activeItem) {
+        removeClass(activeItem, CLASS_ACTIVE);
+        activeItem.removeAttribute('aria-selected');
+      }
+      addClass(item, CLASS_ACTIVE);
+      item.setAttribute('aria-selected', true);
+      if (options.focus) {
+        item.focus();
+      }
+      this.image = image;
+      this.viewed = false;
+      this.index = index;
+      this.imageData = {};
+      addClass(image, CLASS_INVISIBLE);
+      if (options.loading) {
+        addClass(canvas, CLASS_LOADING);
+      }
+      canvas.innerHTML = '';
+      canvas.appendChild(image);
+
+      // Center current item
+      this.renderList();
+
+      // Clear title
+      title.innerHTML = '';
+
+      // Generate title after viewed
+      var onViewed = function onViewed() {
+        var imageData = _this2.imageData;
+        var render = Array.isArray(options.title) ? options.title[1] : options.title;
+        title.innerHTML = escapeHTMLEntities(isFunction(render) ? render.call(_this2, image, imageData) : "".concat(alt, " (").concat(imageData.naturalWidth, " \xD7 ").concat(imageData.naturalHeight, ")"));
+      };
+      var onLoad;
+      var onError;
+      addListener(element, EVENT_VIEWED, onViewed, {
+        once: true
+      });
+      this.viewing = {
+        abort: function abort() {
+          removeListener(element, EVENT_VIEWED, onViewed);
+          if (image.complete) {
+            if (_this2.imageRendering) {
+              _this2.imageRendering.abort();
+            } else if (_this2.imageInitializing) {
+              _this2.imageInitializing.abort();
+            }
+          } else {
+            // Cancel download to save bandwidth.
+            image.src = '';
+            removeListener(image, EVENT_LOAD, onLoad);
+            if (_this2.timeout) {
+              clearTimeout(_this2.timeout);
+            }
+          }
+        }
+      };
+      if (image.complete) {
+        this.load();
+      } else {
+        addListener(image, EVENT_LOAD, onLoad = function onLoad() {
+          removeListener(image, EVENT_ERROR, onError);
+          _this2.load();
+        }, {
+          once: true
+        });
+        addListener(image, EVENT_ERROR, onError = function onError() {
+          removeListener(image, EVENT_LOAD, onLoad);
+          if (_this2.timeout) {
+            clearTimeout(_this2.timeout);
+            _this2.timeout = false;
+          }
+          removeClass(image, CLASS_INVISIBLE);
+          if (options.loading) {
+            removeClass(_this2.canvas, CLASS_LOADING);
+          }
+        }, {
+          once: true
+        });
+        if (this.timeout) {
+          clearTimeout(this.timeout);
+        }
+
+        // Make the image visible if it fails to load within 1s
+        this.timeout = setTimeout(function () {
+          removeClass(image, CLASS_INVISIBLE);
+          _this2.timeout = false;
+        }, 1000);
+      }
+      return this;
+    },
+    /**
+     * View the previous image
+     * @param {boolean} [loop=false] - Indicate if view the last one
+     * when it is the first one at present.
+     * @returns {Viewer} this
+     */
+    prev: function prev() {
+      var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+      var index = this.index - 1;
+      if (index < 0) {
+        index = loop ? this.length - 1 : 0;
+      }
+      this.view(index);
+      return this;
+    },
+    /**
+     * View the next image
+     * @param {boolean} [loop=false] - Indicate if view the first one
+     * when it is the last one at present.
+     * @returns {Viewer} this
+     */
+    next: function next() {
+      var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+      var maxIndex = this.length - 1;
+      var index = this.index + 1;
+      if (index > maxIndex) {
+        index = loop ? 0 : maxIndex;
+      }
+      this.view(index);
+      return this;
+    },
+    /**
+     * Move the image with relative offsets.
+     * @param {number} x - The moving distance in the horizontal direction.
+     * @param {number} [y=x] The moving distance in the vertical direction.
+     * @returns {Viewer} this
+     */
+    move: function move(x) {
+      var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
+      var imageData = this.imageData;
+      this.moveTo(isUndefined(x) ? x : imageData.x + Number(x), isUndefined(y) ? y : imageData.y + Number(y));
+      return this;
+    },
+    /**
+     * Move the image to an absolute point.
+     * @param {number} x - The new position in the horizontal direction.
+     * @param {number} [y=x] - The new position in the vertical direction.
+     * @param {Event} [_originalEvent=null] - The original event if any.
+     * @returns {Viewer} this
+     */
+    moveTo: function moveTo(x) {
+      var _this3 = this;
+      var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
+      var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+      var element = this.element,
+        options = this.options,
+        imageData = this.imageData;
+      x = Number(x);
+      y = Number(y);
+      if (this.viewed && !this.played && options.movable) {
+        var oldX = imageData.x;
+        var oldY = imageData.y;
+        var changed = false;
+        if (isNumber(x)) {
+          changed = true;
+        } else {
+          x = oldX;
+        }
+        if (isNumber(y)) {
+          changed = true;
+        } else {
+          y = oldY;
+        }
+        if (changed) {
+          if (isFunction(options.move)) {
+            addListener(element, EVENT_MOVE, options.move, {
+              once: true
+            });
+          }
+          if (dispatchEvent(element, EVENT_MOVE, {
+            x: x,
+            y: y,
+            oldX: oldX,
+            oldY: oldY,
+            originalEvent: _originalEvent
+          }) === false) {
+            return this;
+          }
+          imageData.x = x;
+          imageData.y = y;
+          imageData.left = x;
+          imageData.top = y;
+          this.moving = true;
+          this.renderImage(function () {
+            _this3.moving = false;
+            if (isFunction(options.moved)) {
+              addListener(element, EVENT_MOVED, options.moved, {
+                once: true
+              });
+            }
+            dispatchEvent(element, EVENT_MOVED, {
+              x: x,
+              y: y,
+              oldX: oldX,
+              oldY: oldY,
+              originalEvent: _originalEvent
+            }, {
+              cancelable: false
+            });
+          });
+        }
+      }
+      return this;
+    },
+    /**
+     * Rotate the image with a relative degree.
+     * @param {number} degree - The rotate degree.
+     * @returns {Viewer} this
+     */
+    rotate: function rotate(degree) {
+      this.rotateTo((this.imageData.rotate || 0) + Number(degree));
+      return this;
+    },
+    /**
+     * Rotate the image to an absolute degree.
+     * @param {number} degree - The rotate degree.
+     * @returns {Viewer} this
+     */
+    rotateTo: function rotateTo(degree) {
+      var _this4 = this;
+      var element = this.element,
+        options = this.options,
+        imageData = this.imageData;
+      degree = Number(degree);
+      if (isNumber(degree) && this.viewed && !this.played && options.rotatable) {
+        var oldDegree = imageData.rotate;
+        if (isFunction(options.rotate)) {
+          addListener(element, EVENT_ROTATE, options.rotate, {
+            once: true
+          });
+        }
+        if (dispatchEvent(element, EVENT_ROTATE, {
+          degree: degree,
+          oldDegree: oldDegree
+        }) === false) {
+          return this;
+        }
+        imageData.rotate = degree;
+        this.rotating = true;
+        this.renderImage(function () {
+          _this4.rotating = false;
+          if (isFunction(options.rotated)) {
+            addListener(element, EVENT_ROTATED, options.rotated, {
+              once: true
+            });
+          }
+          dispatchEvent(element, EVENT_ROTATED, {
+            degree: degree,
+            oldDegree: oldDegree
+          }, {
+            cancelable: false
+          });
+        });
+      }
+      return this;
+    },
+    /**
+     * Scale the image on the x-axis.
+     * @param {number} scaleX - The scale ratio on the x-axis.
+     * @returns {Viewer} this
+     */
+    scaleX: function scaleX(_scaleX) {
+      this.scale(_scaleX, this.imageData.scaleY);
+      return this;
+    },
+    /**
+     * Scale the image on the y-axis.
+     * @param {number} scaleY - The scale ratio on the y-axis.
+     * @returns {Viewer} this
+     */
+    scaleY: function scaleY(_scaleY) {
+      this.scale(this.imageData.scaleX, _scaleY);
+      return this;
+    },
+    /**
+     * Scale the image.
+     * @param {number} scaleX - The scale ratio on the x-axis.
+     * @param {number} [scaleY=scaleX] - The scale ratio on the y-axis.
+     * @returns {Viewer} this
+     */
+    scale: function scale(scaleX) {
+      var _this5 = this;
+      var scaleY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : scaleX;
+      var element = this.element,
+        options = this.options,
+        imageData = this.imageData;
+      scaleX = Number(scaleX);
+      scaleY = Number(scaleY);
+      if (this.viewed && !this.played && options.scalable) {
+        var oldScaleX = imageData.scaleX;
+        var oldScaleY = imageData.scaleY;
+        var changed = false;
+        if (isNumber(scaleX)) {
+          changed = true;
+        } else {
+          scaleX = oldScaleX;
+        }
+        if (isNumber(scaleY)) {
+          changed = true;
+        } else {
+          scaleY = oldScaleY;
+        }
+        if (changed) {
+          if (isFunction(options.scale)) {
+            addListener(element, EVENT_SCALE, options.scale, {
+              once: true
+            });
+          }
+          if (dispatchEvent(element, EVENT_SCALE, {
+            scaleX: scaleX,
+            scaleY: scaleY,
+            oldScaleX: oldScaleX,
+            oldScaleY: oldScaleY
+          }) === false) {
+            return this;
+          }
+          imageData.scaleX = scaleX;
+          imageData.scaleY = scaleY;
+          this.scaling = true;
+          this.renderImage(function () {
+            _this5.scaling = false;
+            if (isFunction(options.scaled)) {
+              addListener(element, EVENT_SCALED, options.scaled, {
+                once: true
+              });
+            }
+            dispatchEvent(element, EVENT_SCALED, {
+              scaleX: scaleX,
+              scaleY: scaleY,
+              oldScaleX: oldScaleX,
+              oldScaleY: oldScaleY
+            }, {
+              cancelable: false
+            });
+          });
+        }
+      }
+      return this;
+    },
+    /**
+     * Zoom the image with a relative ratio.
+     * @param {number} ratio - The target ratio.
+     * @param {boolean} [showTooltip=false] - Indicates whether to show the tooltip.
+     * @param {Object} [pivot] - The pivot point coordinate for zooming.
+     * @param {Event} [_originalEvent=null] - The original event if any.
+     * @returns {Viewer} this
+     */
+    zoom: function zoom(ratio) {
+      var showTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
+      var pivot = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+      var _originalEvent = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
+      var imageData = this.imageData;
+      ratio = Number(ratio);
+      if (ratio < 0) {
+        ratio = 1 / (1 - ratio);
+      } else {
+        ratio = 1 + ratio;
+      }
+      this.zoomTo(imageData.width * ratio / imageData.naturalWidth, showTooltip, pivot, _originalEvent);
+      return this;
+    },
+    /**
+     * Zoom the image to an absolute ratio.
+     * @param {number} ratio - The target ratio.
+     * @param {boolean} [showTooltip] - Indicates whether to show the tooltip.
+     * @param {Object} [pivot] - The pivot point coordinate for zooming.
+     * @param {Event} [_originalEvent=null] - The original event if any.
+     * @param {Event} [_zoomable=false] - Indicates if the current zoom is available or not.
+     * @returns {Viewer} this
+     */
+    zoomTo: function zoomTo(ratio) {
+      var _this6 = this;
+      var showTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
+      var pivot = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
+      var _originalEvent = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
+      var _zoomable = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : false;
+      var element = this.element,
+        options = this.options,
+        pointers = this.pointers,
+        imageData = this.imageData;
+      var x = imageData.x,
+        y = imageData.y,
+        width = imageData.width,
+        height = imageData.height,
+        naturalWidth = imageData.naturalWidth,
+        naturalHeight = imageData.naturalHeight;
+      ratio = Math.max(0, ratio);
+      if (isNumber(ratio) && this.viewed && !this.played && (_zoomable || options.zoomable)) {
+        if (!_zoomable) {
+          var minZoomRatio = Math.max(0.01, options.minZoomRatio);
+          var maxZoomRatio = Math.min(100, options.maxZoomRatio);
+          ratio = Math.min(Math.max(ratio, minZoomRatio), maxZoomRatio);
+        }
+        if (_originalEvent) {
+          switch (_originalEvent.type) {
+            case 'wheel':
+              if (options.zoomRatio >= 0.055 && ratio > 0.95 && ratio < 1.05) {
+                ratio = 1;
+              }
+              break;
+            case 'pointermove':
+            case 'touchmove':
+            case 'mousemove':
+              if (ratio > 0.99 && ratio < 1.01) {
+                ratio = 1;
+              }
+              break;
+          }
+        }
+        var newWidth = naturalWidth * ratio;
+        var newHeight = naturalHeight * ratio;
+        var offsetWidth = newWidth - width;
+        var offsetHeight = newHeight - height;
+        var oldRatio = imageData.ratio;
+        if (isFunction(options.zoom)) {
+          addListener(element, EVENT_ZOOM, options.zoom, {
+            once: true
+          });
+        }
+        if (dispatchEvent(element, EVENT_ZOOM, {
+          ratio: ratio,
+          oldRatio: oldRatio,
+          originalEvent: _originalEvent
+        }) === false) {
+          return this;
+        }
+        this.zooming = true;
+        if (_originalEvent) {
+          var offset = getOffset(this.viewer);
+          var center = pointers && Object.keys(pointers).length > 0 ? getPointersCenter(pointers) : {
+            pageX: _originalEvent.pageX,
+            pageY: _originalEvent.pageY
+          };
+
+          // Zoom from the triggering point of the event
+          imageData.x -= offsetWidth * ((center.pageX - offset.left - x) / width);
+          imageData.y -= offsetHeight * ((center.pageY - offset.top - y) / height);
+        } else if (isPlainObject(pivot) && isNumber(pivot.x) && isNumber(pivot.y)) {
+          imageData.x -= offsetWidth * ((pivot.x - x) / width);
+          imageData.y -= offsetHeight * ((pivot.y - y) / height);
+        } else {
+          // Zoom from the center of the image
+          imageData.x -= offsetWidth / 2;
+          imageData.y -= offsetHeight / 2;
+        }
+        imageData.left = imageData.x;
+        imageData.top = imageData.y;
+        imageData.width = newWidth;
+        imageData.height = newHeight;
+        imageData.oldRatio = oldRatio;
+        imageData.ratio = ratio;
+        this.renderImage(function () {
+          _this6.zooming = false;
+          if (isFunction(options.zoomed)) {
+            addListener(element, EVENT_ZOOMED, options.zoomed, {
+              once: true
+            });
+          }
+          dispatchEvent(element, EVENT_ZOOMED, {
+            ratio: ratio,
+            oldRatio: oldRatio,
+            originalEvent: _originalEvent
+          }, {
+            cancelable: false
+          });
+        });
+        if (showTooltip) {
+          this.tooltip();
+        }
+      }
+      return this;
+    },
+    /**
+     * Play the images
+     * @param {boolean|FullscreenOptions} [fullscreen=false] - Indicate if request fullscreen or not.
+     * @returns {Viewer} this
+     */
+    play: function play() {
+      var _this7 = this;
+      var fullscreen = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
+      if (!this.isShown || this.played) {
+        return this;
+      }
+      var element = this.element,
+        options = this.options;
+      if (isFunction(options.play)) {
+        addListener(element, EVENT_PLAY, options.play, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_PLAY) === false) {
+        return this;
+      }
+      var player = this.player;
+      var onLoad = this.loadImage.bind(this);
+      var list = [];
+      var total = 0;
+      var index = 0;
+      this.played = true;
+      this.onLoadWhenPlay = onLoad;
+      if (fullscreen) {
+        this.requestFullscreen(fullscreen);
+      }
+      addClass(player, CLASS_SHOW);
+      forEach(this.items, function (item, i) {
+        var img = item.querySelector('img');
+        var image = document.createElement('img');
+        image.src = getData(img, 'originalUrl');
+        image.alt = img.getAttribute('alt');
+        image.referrerPolicy = img.referrerPolicy;
+        total += 1;
+        addClass(image, CLASS_FADE);
+        toggleClass(image, CLASS_TRANSITION, options.transition);
+        if (hasClass(item, CLASS_ACTIVE)) {
+          addClass(image, CLASS_IN);
+          index = i;
+        }
+        list.push(image);
+        addListener(image, EVENT_LOAD, onLoad, {
+          once: true
+        });
+        player.appendChild(image);
+      });
+      if (isNumber(options.interval) && options.interval > 0) {
+        var prev = function prev() {
+          clearTimeout(_this7.playing.timeout);
+          removeClass(list[index], CLASS_IN);
+          index -= 1;
+          index = index >= 0 ? index : total - 1;
+          addClass(list[index], CLASS_IN);
+          _this7.playing.timeout = setTimeout(prev, options.interval);
+        };
+        var next = function next() {
+          clearTimeout(_this7.playing.timeout);
+          removeClass(list[index], CLASS_IN);
+          index += 1;
+          index = index < total ? index : 0;
+          addClass(list[index], CLASS_IN);
+          _this7.playing.timeout = setTimeout(next, options.interval);
+        };
+        if (total > 1) {
+          this.playing = {
+            prev: prev,
+            next: next,
+            timeout: setTimeout(next, options.interval)
+          };
+        }
+      }
+      return this;
+    },
+    // Stop play
+    stop: function stop() {
+      var _this8 = this;
+      if (!this.played) {
+        return this;
+      }
+      var element = this.element,
+        options = this.options;
+      if (isFunction(options.stop)) {
+        addListener(element, EVENT_STOP, options.stop, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_STOP) === false) {
+        return this;
+      }
+      var player = this.player;
+      clearTimeout(this.playing.timeout);
+      this.playing = false;
+      this.played = false;
+      forEach(player.getElementsByTagName('img'), function (image) {
+        removeListener(image, EVENT_LOAD, _this8.onLoadWhenPlay);
+      });
+      removeClass(player, CLASS_SHOW);
+      player.innerHTML = '';
+      this.exitFullscreen();
+      return this;
+    },
+    // Enter modal mode (only available in inline mode)
+    full: function full() {
+      var _this9 = this;
+      var options = this.options,
+        viewer = this.viewer,
+        image = this.image,
+        list = this.list;
+      if (!this.isShown || this.played || this.fulled || !options.inline) {
+        return this;
+      }
+      this.fulled = true;
+      this.open();
+      addClass(this.button, CLASS_FULLSCREEN_EXIT);
+      if (options.transition) {
+        removeClass(list, CLASS_TRANSITION);
+        if (this.viewed) {
+          removeClass(image, CLASS_TRANSITION);
+        }
+      }
+      addClass(viewer, CLASS_FIXED);
+      viewer.setAttribute('role', 'dialog');
+      viewer.setAttribute('aria-labelledby', this.title.id);
+      viewer.setAttribute('aria-modal', true);
+      viewer.removeAttribute('style');
+      setStyle(viewer, {
+        zIndex: options.zIndex
+      });
+      if (options.focus) {
+        this.enforceFocus();
+      }
+      this.initContainer();
+      this.viewerData = assign({}, this.containerData);
+      this.renderList();
+      if (this.viewed) {
+        this.initImage(function () {
+          _this9.renderImage(function () {
+            if (options.transition) {
+              setTimeout(function () {
+                addClass(image, CLASS_TRANSITION);
+                addClass(list, CLASS_TRANSITION);
+              }, 0);
+            }
+          });
+        });
+      }
+      return this;
+    },
+    // Exit modal mode (only available in inline mode)
+    exit: function exit() {
+      var _this10 = this;
+      var options = this.options,
+        viewer = this.viewer,
+        image = this.image,
+        list = this.list;
+      if (!this.isShown || this.played || !this.fulled || !options.inline) {
+        return this;
+      }
+      this.fulled = false;
+      this.close();
+      removeClass(this.button, CLASS_FULLSCREEN_EXIT);
+      if (options.transition) {
+        removeClass(list, CLASS_TRANSITION);
+        if (this.viewed) {
+          removeClass(image, CLASS_TRANSITION);
+        }
+      }
+      if (options.focus) {
+        this.clearEnforceFocus();
+      }
+      viewer.removeAttribute('role');
+      viewer.removeAttribute('aria-labelledby');
+      viewer.removeAttribute('aria-modal');
+      removeClass(viewer, CLASS_FIXED);
+      setStyle(viewer, {
+        zIndex: options.zIndexInline
+      });
+      this.viewerData = assign({}, this.parentData);
+      this.renderViewer();
+      this.renderList();
+      if (this.viewed) {
+        this.initImage(function () {
+          _this10.renderImage(function () {
+            if (options.transition) {
+              setTimeout(function () {
+                addClass(image, CLASS_TRANSITION);
+                addClass(list, CLASS_TRANSITION);
+              }, 0);
+            }
+          });
+        });
+      }
+      return this;
+    },
+    // Show the current ratio of the image with percentage
+    tooltip: function tooltip() {
+      var _this11 = this;
+      var options = this.options,
+        tooltipBox = this.tooltipBox,
+        imageData = this.imageData;
+      if (!this.viewed || this.played || !options.tooltip) {
+        return this;
+      }
+      tooltipBox.textContent = "".concat(Math.round(imageData.ratio * 100), "%");
+      if (!this.tooltipping) {
+        if (options.transition) {
+          if (this.fading) {
+            dispatchEvent(tooltipBox, EVENT_TRANSITION_END);
+          }
+          addClass(tooltipBox, CLASS_SHOW);
+          addClass(tooltipBox, CLASS_FADE);
+          addClass(tooltipBox, CLASS_TRANSITION);
+          tooltipBox.removeAttribute('aria-hidden');
+
+          // Force reflow to enable CSS3 transition
+          tooltipBox.initialOffsetWidth = tooltipBox.offsetWidth;
+          addClass(tooltipBox, CLASS_IN);
+        } else {
+          addClass(tooltipBox, CLASS_SHOW);
+          tooltipBox.removeAttribute('aria-hidden');
+        }
+      } else {
+        clearTimeout(this.tooltipping);
+      }
+      this.tooltipping = setTimeout(function () {
+        if (options.transition) {
+          addListener(tooltipBox, EVENT_TRANSITION_END, function () {
+            removeClass(tooltipBox, CLASS_SHOW);
+            removeClass(tooltipBox, CLASS_FADE);
+            removeClass(tooltipBox, CLASS_TRANSITION);
+            tooltipBox.setAttribute('aria-hidden', true);
+            _this11.fading = false;
+          }, {
+            once: true
+          });
+          removeClass(tooltipBox, CLASS_IN);
+          _this11.fading = true;
+        } else {
+          removeClass(tooltipBox, CLASS_SHOW);
+          tooltipBox.setAttribute('aria-hidden', true);
+        }
+        _this11.tooltipping = false;
+      }, 1000);
+      return this;
+    },
+    /**
+     * Toggle the image size between its current size and natural size
+     * @param {Event} [_originalEvent=null] - The original event if any.
+     * @returns {Viewer} this
+     */
+    toggle: function toggle() {
+      var _originalEvent = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
+      if (this.imageData.ratio === 1) {
+        this.zoomTo(this.imageData.oldRatio, true, null, _originalEvent);
+      } else {
+        this.zoomTo(1, true, null, _originalEvent);
+      }
+      return this;
+    },
+    // Reset the image to its initial state
+    reset: function reset() {
+      if (this.viewed && !this.played) {
+        this.imageData = assign({}, this.initialImageData);
+        this.renderImage();
+      }
+      return this;
+    },
+    // Update viewer when images changed
+    update: function update() {
+      var _this12 = this;
+      var element = this.element,
+        options = this.options,
+        isImg = this.isImg;
+
+      // Destroy viewer if the target image was deleted
+      if (isImg && !element.parentNode) {
+        return this.destroy();
+      }
+      var images = [];
+      forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
+        if (isFunction(options.filter)) {
+          if (options.filter.call(_this12, image)) {
+            images.push(image);
+          }
+        } else if (_this12.getImageURL(image)) {
+          images.push(image);
+        }
+      });
+      if (!images.length) {
+        return this;
+      }
+      this.images = images;
+      this.length = images.length;
+      if (this.ready) {
+        var changedIndexes = [];
+        forEach(this.items, function (item, i) {
+          var img = item.querySelector('img');
+          var image = images[i];
+          if (image && img) {
+            if (image.src !== img.src
+
+            // Title changed (#408)
+            || image.alt !== img.alt) {
+              changedIndexes.push(i);
+            }
+          } else {
+            changedIndexes.push(i);
+          }
+        });
+        setStyle(this.list, {
+          width: 'auto'
+        });
+        this.initList();
+        if (this.isShown) {
+          if (this.length) {
+            if (this.viewed) {
+              var changedIndex = changedIndexes.indexOf(this.index);
+              if (changedIndex >= 0) {
+                this.viewed = false;
+                this.view(Math.max(Math.min(this.index - changedIndex, this.length - 1), 0));
+              } else {
+                var activeItem = this.items[this.index];
+
+                // Reactivate the current viewing item after reset the list.
+                addClass(activeItem, CLASS_ACTIVE);
+                activeItem.setAttribute('aria-selected', true);
+              }
+            }
+          } else {
+            this.image = null;
+            this.viewed = false;
+            this.index = 0;
+            this.imageData = {};
+            this.canvas.innerHTML = '';
+            this.title.innerHTML = '';
+          }
+        }
+      } else {
+        this.build();
+      }
+      return this;
+    },
+    // Destroy the viewer
+    destroy: function destroy() {
+      var element = this.element,
+        options = this.options;
+      if (!element[NAMESPACE]) {
+        return this;
+      }
+      this.destroyed = true;
+      if (this.ready) {
+        if (this.played) {
+          this.stop();
+        }
+        if (options.inline) {
+          if (this.fulled) {
+            this.exit();
+          }
+          this.unbind();
+        } else if (this.isShown) {
+          if (this.viewing) {
+            if (this.imageRendering) {
+              this.imageRendering.abort();
+            } else if (this.imageInitializing) {
+              this.imageInitializing.abort();
+            }
+          }
+          if (this.hiding) {
+            this.transitioning.abort();
+          }
+          this.hidden();
+        } else if (this.showing) {
+          this.transitioning.abort();
+          this.hidden();
+        }
+        this.ready = false;
+        this.viewer.parentNode.removeChild(this.viewer);
+      } else if (options.inline) {
+        if (this.delaying) {
+          this.delaying.abort();
+        } else if (this.initializing) {
+          this.initializing.abort();
+        }
+      }
+      if (!options.inline) {
+        removeListener(element, EVENT_CLICK, this.onStart);
+      }
+      element[NAMESPACE] = undefined;
+      return this;
+    }
+  };
+
+  var others = {
+    getImageURL: function getImageURL(image) {
+      var url = this.options.url;
+      if (isString(url)) {
+        url = image.getAttribute(url);
+      } else if (isFunction(url)) {
+        url = url.call(this, image);
+      } else {
+        url = '';
+      }
+      return url;
+    },
+    enforceFocus: function enforceFocus() {
+      var _this = this;
+      this.clearEnforceFocus();
+      addListener(document, EVENT_FOCUSIN, this.onFocusin = function (event) {
+        var viewer = _this.viewer;
+        var target = event.target;
+        if (target === document || target === viewer || viewer.contains(target)) {
+          return;
+        }
+        while (target) {
+          // Avoid conflicts with other modals (#474, #540)
+          if (target.getAttribute('tabindex') !== null || target.getAttribute('aria-modal') === 'true') {
+            return;
+          }
+          target = target.parentElement;
+        }
+        viewer.focus();
+      });
+    },
+    clearEnforceFocus: function clearEnforceFocus() {
+      if (this.onFocusin) {
+        removeListener(document, EVENT_FOCUSIN, this.onFocusin);
+        this.onFocusin = null;
+      }
+    },
+    open: function open() {
+      var body = this.body;
+      addClass(body, CLASS_OPEN);
+      if (this.scrollbarWidth > 0) {
+        body.style.paddingRight = "".concat(this.scrollbarWidth + (parseFloat(this.initialBodyComputedPaddingRight) || 0), "px");
+      }
+    },
+    close: function close() {
+      var body = this.body;
+      removeClass(body, CLASS_OPEN);
+      if (this.scrollbarWidth > 0) {
+        body.style.paddingRight = this.initialBodyPaddingRight;
+      }
+    },
+    shown: function shown() {
+      var element = this.element,
+        options = this.options,
+        viewer = this.viewer;
+      this.fulled = true;
+      this.isShown = true;
+      this.render();
+      this.bind();
+      this.showing = false;
+      if (options.focus) {
+        viewer.focus();
+        this.enforceFocus();
+      }
+      if (isFunction(options.shown)) {
+        addListener(element, EVENT_SHOWN, options.shown, {
+          once: true
+        });
+      }
+      if (dispatchEvent(element, EVENT_SHOWN) === false) {
+        return;
+      }
+      if (this.ready && this.isShown && !this.hiding) {
+        this.view(this.index);
+      }
+    },
+    hidden: function hidden() {
+      var element = this.element,
+        options = this.options,
+        viewer = this.viewer;
+      if (options.fucus) {
+        this.clearEnforceFocus();
+      }
+      this.fulled = false;
+      this.viewed = false;
+      this.isShown = false;
+      this.close();
+      this.unbind();
+      addClass(viewer, CLASS_HIDE);
+      viewer.removeAttribute('role');
+      viewer.removeAttribute('aria-labelledby');
+      viewer.removeAttribute('aria-modal');
+      viewer.setAttribute('aria-hidden', true);
+      this.resetList();
+      this.resetImage();
+      this.hiding = false;
+      if (!this.destroyed) {
+        if (isFunction(options.hidden)) {
+          addListener(element, EVENT_HIDDEN, options.hidden, {
+            once: true
+          });
+        }
+        dispatchEvent(element, EVENT_HIDDEN, null, {
+          cancelable: false
+        });
+      }
+    },
+    requestFullscreen: function requestFullscreen(options) {
+      var document = this.element.ownerDocument;
+      if (this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+        var documentElement = document.documentElement;
+
+        // Element.requestFullscreen()
+        if (documentElement.requestFullscreen) {
+          // Avoid TypeError when convert `options` to dictionary
+          if (isPlainObject(options)) {
+            documentElement.requestFullscreen(options);
+          } else {
+            documentElement.requestFullscreen();
+          }
+        } else if (documentElement.webkitRequestFullscreen) {
+          documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
+        } else if (documentElement.mozRequestFullScreen) {
+          documentElement.mozRequestFullScreen();
+        } else if (documentElement.msRequestFullscreen) {
+          documentElement.msRequestFullscreen();
+        }
+      }
+    },
+    exitFullscreen: function exitFullscreen() {
+      var document = this.element.ownerDocument;
+      if (this.fulled && (document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
+        // Document.exitFullscreen()
+        if (document.exitFullscreen) {
+          document.exitFullscreen();
+        } else if (document.webkitExitFullscreen) {
+          document.webkitExitFullscreen();
+        } else if (document.mozCancelFullScreen) {
+          document.mozCancelFullScreen();
+        } else if (document.msExitFullscreen) {
+          document.msExitFullscreen();
+        }
+      }
+    },
+    change: function change(event) {
+      var options = this.options,
+        pointers = this.pointers;
+      var pointer = pointers[Object.keys(pointers)[0]];
+
+      // In the case of the `pointers` object is empty (#421)
+      if (!pointer) {
+        return;
+      }
+      var offsetX = pointer.endX - pointer.startX;
+      var offsetY = pointer.endY - pointer.startY;
+      switch (this.action) {
+        // Move the current image
+        case ACTION_MOVE:
+          this.move(offsetX, offsetY, event);
+          break;
+
+        // Zoom the current image
+        case ACTION_ZOOM:
+          this.zoom(getMaxZoomRatio(pointers), false, null, event);
+          break;
+        case ACTION_SWITCH:
+          {
+            this.action = 'switched';
+            var absoluteOffsetX = Math.abs(offsetX);
+            if (absoluteOffsetX > 1 && absoluteOffsetX > Math.abs(offsetY)) {
+              // Empty `pointers` as `touchend` event will not be fired after swiped in iOS browsers.
+              this.pointers = {};
+              if (offsetX > 1) {
+                this.prev(options.loop);
+              } else if (offsetX < -1) {
+                this.next(options.loop);
+              }
+            }
+            break;
+          }
+      }
+
+      // Override
+      forEach(pointers, function (p) {
+        p.startX = p.endX;
+        p.startY = p.endY;
+      });
+    },
+    isSwitchable: function isSwitchable() {
+      var imageData = this.imageData,
+        viewerData = this.viewerData;
+      return this.length > 1 && imageData.x >= 0 && imageData.y >= 0 && imageData.width <= viewerData.width && imageData.height <= viewerData.height;
+    }
+  };
+
+  var AnotherViewer = WINDOW.Viewer;
+  var getUniqueID = function (id) {
+    return function () {
+      id += 1;
+      return id;
+    };
+  }(-1);
+  var Viewer = /*#__PURE__*/function () {
+    /**
+     * Create a new Viewer.
+     * @param {Element} element - The target element for viewing.
+     * @param {Object} [options={}] - The configuration options.
+     */
+    function Viewer(element) {
+      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+      _classCallCheck(this, Viewer);
+      if (!element || element.nodeType !== 1) {
+        throw new Error('The first argument is required and must be an element.');
+      }
+      this.element = element;
+      this.options = assign({}, DEFAULTS, isPlainObject(options) && options);
+      this.action = false;
+      this.fading = false;
+      this.fulled = false;
+      this.hiding = false;
+      this.imageClicked = false;
+      this.imageData = {};
+      this.index = this.options.initialViewIndex;
+      this.isImg = false;
+      this.isShown = false;
+      this.length = 0;
+      this.moving = false;
+      this.played = false;
+      this.playing = false;
+      this.pointers = {};
+      this.ready = false;
+      this.rotating = false;
+      this.scaling = false;
+      this.showing = false;
+      this.timeout = false;
+      this.tooltipping = false;
+      this.viewed = false;
+      this.viewing = false;
+      this.wheeling = false;
+      this.zooming = false;
+      this.pointerMoved = false;
+      this.id = getUniqueID();
+      this.init();
+    }
+    _createClass(Viewer, [{
+      key: "init",
+      value: function init() {
+        var _this = this;
+        var element = this.element,
+          options = this.options;
+        if (element[NAMESPACE]) {
+          return;
+        }
+        element[NAMESPACE] = this;
+
+        // The `focus` option requires the `keyboard` option set to `true`.
+        if (options.focus && !options.keyboard) {
+          options.focus = false;
+        }
+        var isImg = element.localName === 'img';
+        var images = [];
+        forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
+          if (isFunction(options.filter)) {
+            if (options.filter.call(_this, image)) {
+              images.push(image);
+            }
+          } else if (_this.getImageURL(image)) {
+            images.push(image);
+          }
+        });
+        this.isImg = isImg;
+        this.length = images.length;
+        this.images = images;
+        this.initBody();
+
+        // Override `transition` option if it is not supported
+        if (isUndefined(document.createElement(NAMESPACE).style.transition)) {
+          options.transition = false;
+        }
+        if (options.inline) {
+          var count = 0;
+          var progress = function progress() {
+            count += 1;
+            if (count === _this.length) {
+              var timeout;
+              _this.initializing = false;
+              _this.delaying = {
+                abort: function abort() {
+                  clearTimeout(timeout);
+                }
+              };
+
+              // build asynchronously to keep `this.viewer` is accessible in `ready` event handler.
+              timeout = setTimeout(function () {
+                _this.delaying = false;
+                _this.build();
+              }, 0);
+            }
+          };
+          this.initializing = {
+            abort: function abort() {
+              forEach(images, function (image) {
+                if (!image.complete) {
+                  removeListener(image, EVENT_LOAD, progress);
+                  removeListener(image, EVENT_ERROR, progress);
+                }
+              });
+            }
+          };
+          forEach(images, function (image) {
+            if (image.complete) {
+              progress();
+            } else {
+              var onLoad;
+              var onError;
+              addListener(image, EVENT_LOAD, onLoad = function onLoad() {
+                removeListener(image, EVENT_ERROR, onError);
+                progress();
+              }, {
+                once: true
+              });
+              addListener(image, EVENT_ERROR, onError = function onError() {
+                removeListener(image, EVENT_LOAD, onLoad);
+                progress();
+              }, {
+                once: true
+              });
+            }
+          });
+        } else {
+          addListener(element, EVENT_CLICK, this.onStart = function (_ref) {
+            var target = _ref.target;
+            if (target.localName === 'img' && (!isFunction(options.filter) || options.filter.call(_this, target))) {
+              _this.view(_this.images.indexOf(target));
+            }
+          });
+        }
+      }
+    }, {
+      key: "build",
+      value: function build() {
+        if (this.ready) {
+          return;
+        }
+        var element = this.element,
+          options = this.options;
+        var parent = element.parentNode;
+        var template = document.createElement('div');
+        template.innerHTML = TEMPLATE;
+        var viewer = template.querySelector(".".concat(NAMESPACE, "-container"));
+        var title = viewer.querySelector(".".concat(NAMESPACE, "-title"));
+        var toolbar = viewer.querySelector(".".concat(NAMESPACE, "-toolbar"));
+        var navbar = viewer.querySelector(".".concat(NAMESPACE, "-navbar"));
+        var button = viewer.querySelector(".".concat(NAMESPACE, "-button"));
+        var canvas = viewer.querySelector(".".concat(NAMESPACE, "-canvas"));
+        this.parent = parent;
+        this.viewer = viewer;
+        this.title = title;
+        this.toolbar = toolbar;
+        this.navbar = navbar;
+        this.button = button;
+        this.canvas = canvas;
+        this.footer = viewer.querySelector(".".concat(NAMESPACE, "-footer"));
+        this.tooltipBox = viewer.querySelector(".".concat(NAMESPACE, "-tooltip"));
+        this.player = viewer.querySelector(".".concat(NAMESPACE, "-player"));
+        this.list = viewer.querySelector(".".concat(NAMESPACE, "-list"));
+        viewer.id = "".concat(NAMESPACE).concat(this.id);
+        title.id = "".concat(NAMESPACE, "Title").concat(this.id);
+        addClass(title, !options.title ? CLASS_HIDE : getResponsiveClass(Array.isArray(options.title) ? options.title[0] : options.title));
+        addClass(navbar, !options.navbar ? CLASS_HIDE : getResponsiveClass(options.navbar));
+        toggleClass(button, CLASS_HIDE, !options.button);
+        if (options.keyboard) {
+          button.setAttribute('tabindex', 0);
+        }
+        if (options.backdrop) {
+          addClass(viewer, "".concat(NAMESPACE, "-backdrop"));
+          if (!options.inline && options.backdrop !== 'static') {
+            setData(canvas, DATA_ACTION, 'hide');
+          }
+        }
+        if (isString(options.className) && options.className) {
+          // In case there are multiple class names
+          options.className.split(REGEXP_SPACES).forEach(function (className) {
+            addClass(viewer, className);
+          });
+        }
+        if (options.toolbar) {
+          var list = document.createElement('ul');
+          var custom = isPlainObject(options.toolbar);
+          var zoomButtons = BUTTONS.slice(0, 3);
+          var rotateButtons = BUTTONS.slice(7, 9);
+          var scaleButtons = BUTTONS.slice(9);
+          if (!custom) {
+            addClass(toolbar, getResponsiveClass(options.toolbar));
+          }
+          forEach(custom ? options.toolbar : BUTTONS, function (value, index) {
+            var deep = custom && isPlainObject(value);
+            var name = custom ? hyphenate(index) : value;
+            var show = deep && !isUndefined(value.show) ? value.show : value;
+            if (!show || !options.zoomable && zoomButtons.indexOf(name) !== -1 || !options.rotatable && rotateButtons.indexOf(name) !== -1 || !options.scalable && scaleButtons.indexOf(name) !== -1) {
+              return;
+            }
+            var size = deep && !isUndefined(value.size) ? value.size : value;
+            var click = deep && !isUndefined(value.click) ? value.click : value;
+            var item = document.createElement('li');
+            if (options.keyboard) {
+              item.setAttribute('tabindex', 0);
+            }
+            item.setAttribute('role', 'button');
+            addClass(item, "".concat(NAMESPACE, "-").concat(name));
+            if (!isFunction(click)) {
+              setData(item, DATA_ACTION, name);
+            }
+            if (isNumber(show)) {
+              addClass(item, getResponsiveClass(show));
+            }
+            if (['small', 'large'].indexOf(size) !== -1) {
+              addClass(item, "".concat(NAMESPACE, "-").concat(size));
+            } else if (name === 'play') {
+              addClass(item, "".concat(NAMESPACE, "-large"));
+            }
+            if (isFunction(click)) {
+              addListener(item, EVENT_CLICK, click);
+            }
+            list.appendChild(item);
+          });
+          toolbar.appendChild(list);
+        } else {
+          addClass(toolbar, CLASS_HIDE);
+        }
+        if (!options.rotatable) {
+          var rotates = toolbar.querySelectorAll('li[class*="rotate"]');
+          addClass(rotates, CLASS_INVISIBLE);
+          forEach(rotates, function (rotate) {
+            toolbar.appendChild(rotate);
+          });
+        }
+        if (options.inline) {
+          addClass(button, CLASS_FULLSCREEN);
+          setStyle(viewer, {
+            zIndex: options.zIndexInline
+          });
+          if (window.getComputedStyle(parent).position === 'static') {
+            setStyle(parent, {
+              position: 'relative'
+            });
+          }
+          parent.insertBefore(viewer, element.nextSibling);
+        } else {
+          addClass(button, CLASS_CLOSE);
+          addClass(viewer, CLASS_FIXED);
+          addClass(viewer, CLASS_FADE);
+          addClass(viewer, CLASS_HIDE);
+          setStyle(viewer, {
+            zIndex: options.zIndex
+          });
+          var container = options.container;
+          if (isString(container)) {
+            container = element.ownerDocument.querySelector(container);
+          }
+          if (!container) {
+            container = this.body;
+          }
+          container.appendChild(viewer);
+        }
+        if (options.inline) {
+          this.render();
+          this.bind();
+          this.isShown = true;
+        }
+        this.ready = true;
+        if (isFunction(options.ready)) {
+          addListener(element, EVENT_READY, options.ready, {
+            once: true
+          });
+        }
+        if (dispatchEvent(element, EVENT_READY) === false) {
+          this.ready = false;
+          return;
+        }
+        if (this.ready && options.inline) {
+          this.view(this.index);
+        }
+      }
+
+      /**
+       * Get the no conflict viewer class.
+       * @returns {Viewer} The viewer class.
+       */
+    }], [{
+      key: "noConflict",
+      value: function noConflict() {
+        window.Viewer = AnotherViewer;
+        return Viewer;
+      }
+
+      /**
+       * Change the default options.
+       * @param {Object} options - The new default options.
+       */
+    }, {
+      key: "setDefaults",
+      value: function setDefaults(options) {
+        assign(DEFAULTS, isPlainObject(options) && options);
+      }
+    }]);
+    return Viewer;
+  }();
+  assign(Viewer.prototype, render, events, handlers, methods, others);
+
+  return Viewer;
+
+}));
diff --git a/static/viewerjs/dist/viewer.min.css b/static/viewerjs/dist/viewer.min.css
new file mode 100644
index 0000000..1ef93f4
--- /dev/null
+++ b/static/viewerjs/dist/viewer.min.css
@@ -0,0 +1,9 @@
+/*!
+ * Viewer.js v1.11.2
+ * https://fengyuanchen.github.io/viewerjs
+ *
+ * Copyright 2015-present Chen Fengyuan
+ * Released under the MIT license
+ *
+ * Date: 2023-01-01T10:14:47.694Z
+ */.viewer-close:before,.viewer-flip-horizontal:before,.viewer-flip-vertical:before,.viewer-fullscreen-exit:before,.viewer-fullscreen:before,.viewer-next:before,.viewer-one-to-one:before,.viewer-play:before,.viewer-prev:before,.viewer-reset:before,.viewer-rotate-left:before,.viewer-rotate-right:before,.viewer-zoom-in:before,.viewer-zoom-out:before{background-image:url("data:image/png;base64,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");background-repeat:no-repeat;background-size:280px;color:transparent;display:block;font-size:0;height:20px;line-height:0;width:20px}.viewer-zoom-in:before{background-position:0 0;content:"Zoom In"}.viewer-zoom-out:before{background-position:-20px 0;content:"Zoom Out"}.viewer-one-to-one:before{background-position:-40px 0;content:"One to One"}.viewer-reset:before{background-position:-60px 0;content:"Reset"}.viewer-prev:before{background-position:-80px 0;content:"Previous"}.viewer-play:before{background-position:-100px 0;content:"Play"}.viewer-next:before{background-position:-120px 0;content:"Next"}.viewer-rotate-left:before{background-position:-140px 0;content:"Rotate Left"}.viewer-rotate-right:before{background-position:-160px 0;content:"Rotate Right"}.viewer-flip-horizontal:before{background-position:-180px 0;content:"Flip Horizontal"}.viewer-flip-vertical:before{background-position:-200px 0;content:"Flip Vertical"}.viewer-fullscreen:before{background-position:-220px 0;content:"Enter Full Screen"}.viewer-fullscreen-exit:before{background-position:-240px 0;content:"Exit Full Screen"}.viewer-close:before{background-position:-260px 0;content:"Close"}.viewer-container{-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;bottom:0;direction:ltr;font-size:0;left:0;line-height:0;overflow:hidden;position:absolute;right:0;top:0;-ms-touch-action:none;touch-action:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.viewer-container ::-moz-selection,.viewer-container::-moz-selection{background-color:transparent}.viewer-container ::selection,.viewer-container::selection{background-color:transparent}.viewer-container:focus{outline:0}.viewer-container img{display:block;height:auto;max-height:none!important;max-width:none!important;min-height:0!important;min-width:0!important;width:100%}.viewer-canvas{bottom:0;left:0;overflow:hidden;position:absolute;right:0;top:0}.viewer-canvas>img{height:auto;margin:15px auto;max-width:90%!important;width:auto}.viewer-footer{bottom:0;left:0;overflow:hidden;position:absolute;right:0;text-align:center}.viewer-navbar{background-color:rgba(0,0,0,.5);overflow:hidden}.viewer-list{box-sizing:content-box;height:50px;margin:0;overflow:hidden;padding:1px 0}.viewer-list>li{color:transparent;cursor:pointer;float:left;font-size:0;height:50px;line-height:0;opacity:.5;overflow:hidden;transition:opacity .15s;width:30px}.viewer-list>li:focus,.viewer-list>li:hover{opacity:.75}.viewer-list>li:focus{outline:0}.viewer-list>li+li{margin-left:1px}.viewer-list>.viewer-loading{position:relative}.viewer-list>.viewer-loading:after{border-width:2px;height:20px;margin-left:-10px;margin-top:-10px;width:20px}.viewer-list>.viewer-active,.viewer-list>.viewer-active:focus,.viewer-list>.viewer-active:hover{opacity:1}.viewer-player{background-color:#000;bottom:0;cursor:none;display:none;right:0;z-index:1}.viewer-player,.viewer-player>img{left:0;position:absolute;top:0}.viewer-toolbar>ul{display:inline-block;margin:0 auto 5px;overflow:hidden;padding:6px 3px}.viewer-toolbar>ul>li{background-color:rgba(0,0,0,.5);border-radius:50%;cursor:pointer;float:left;height:24px;overflow:hidden;transition:background-color .15s;width:24px}.viewer-toolbar>ul>li:focus,.viewer-toolbar>ul>li:hover{background-color:rgba(0,0,0,.8)}.viewer-toolbar>ul>li:focus{box-shadow:0 0 3px #fff;outline:0;position:relative;z-index:1}.viewer-toolbar>ul>li:before{margin:2px}.viewer-toolbar>ul>li+li{margin-left:1px}.viewer-toolbar>ul>.viewer-small{height:18px;margin-bottom:3px;margin-top:3px;width:18px}.viewer-toolbar>ul>.viewer-small:before{margin:-1px}.viewer-toolbar>ul>.viewer-large{height:30px;margin-bottom:-3px;margin-top:-3px;width:30px}.viewer-toolbar>ul>.viewer-large:before{margin:5px}.viewer-tooltip{background-color:rgba(0,0,0,.8);border-radius:10px;color:#fff;display:none;font-size:12px;height:20px;left:50%;line-height:20px;margin-left:-25px;margin-top:-10px;position:absolute;text-align:center;top:50%;width:50px}.viewer-title{color:#ccc;display:inline-block;font-size:12px;line-height:1.2;margin:5px 5%;max-width:90%;min-height:14px;opacity:.8;overflow:hidden;text-overflow:ellipsis;transition:opacity .15s;white-space:nowrap}.viewer-title:hover{opacity:1}.viewer-button{-webkit-app-region:no-drag;background-color:rgba(0,0,0,.5);border-radius:50%;cursor:pointer;height:80px;overflow:hidden;position:absolute;right:-40px;top:-40px;transition:background-color .15s;width:80px}.viewer-button:focus,.viewer-button:hover{background-color:rgba(0,0,0,.8)}.viewer-button:focus{box-shadow:0 0 3px #fff;outline:0}.viewer-button:before{bottom:15px;left:15px;position:absolute}.viewer-fixed{position:fixed}.viewer-open{overflow:hidden}.viewer-show{display:block}.viewer-hide{display:none}.viewer-backdrop{background-color:rgba(0,0,0,.5)}.viewer-invisible{visibility:hidden}.viewer-move{cursor:move;cursor:grab}.viewer-fade{opacity:0}.viewer-in{opacity:1}.viewer-transition{transition:all .3s}@keyframes viewer-spinner{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.viewer-loading:after{animation:viewer-spinner 1s linear infinite;border:4px solid hsla(0,0%,100%,.1);border-left-color:hsla(0,0%,100%,.5);border-radius:50%;content:"";display:inline-block;height:40px;left:50%;margin-left:-20px;margin-top:-20px;position:absolute;top:50%;width:40px;z-index:1}@media (max-width:767px){.viewer-hide-xs-down{display:none}}@media (max-width:991px){.viewer-hide-sm-down{display:none}}@media (max-width:1199px){.viewer-hide-md-down{display:none}}
\ No newline at end of file
diff --git a/static/viewerjs/dist/viewer.min.js b/static/viewerjs/dist/viewer.min.js
new file mode 100644
index 0000000..307ba08
--- /dev/null
+++ b/static/viewerjs/dist/viewer.min.js
@@ -0,0 +1,10 @@
+/*!
+ * Viewer.js v1.11.2
+ * https://fengyuanchen.github.io/viewerjs
+ *
+ * Copyright 2015-present Chen Fengyuan
+ * Released under the MIT license
+ *
+ * Date: 2023-01-01T10:14:49.638Z
+ */
+!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).Viewer=e()}(this,function(){"use strict";function s(e,t){var i,n=Object.keys(e);return Object.getOwnPropertySymbols&&(i=Object.getOwnPropertySymbols(e),t&&(i=i.filter(function(t){return Object.getOwnPropertyDescriptor(e,t).enumerable})),n.push.apply(n,i)),n}function q(n){for(var t=1;t<arguments.length;t++){var o=null!=arguments[t]?arguments[t]:{};t%2?s(Object(o),!0).forEach(function(t){var e,i;e=n,i=o[t=t],(t=l(t))in e?Object.defineProperty(e,t,{value:i,enumerable:!0,configurable:!0,writable:!0}):e[t]=i}):Object.getOwnPropertyDescriptors?Object.defineProperties(n,Object.getOwnPropertyDescriptors(o)):s(Object(o)).forEach(function(t){Object.defineProperty(n,t,Object.getOwnPropertyDescriptor(o,t))})}return n}function n(t){return(n="function"==typeof Symbol&&"symbol"==typeof 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