Viewer

强大的图片查看器插件Viewer.js
目前為 2024-01-03 提交的版本，檢視最新版本。
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.cn-greasyfork.org/scripts/449471/1305483/Viewer.js
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/*!
 * Viewer.js v1.11.6
 * https://fengyuanchen.github.io/viewerjs
 *
 * Copyright 2015-present Chen Fengyuan
 * Released under the MIT license
 *
 * Date: 2023-09-17T03:16:35.830Z
 */
(function () {
  let cssResource = `
  .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, 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: 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, 0.5);
      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, 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, 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: 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, 0.5);
  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, 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, 0.5);
}
 
.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, 0.1);
    border-left-color: rgba(255, 255, 255, 0.5);
    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;
  }
}
  `;
  let cssResourceNode = document.createElement("style");
  cssResourceNode.setAttribute("type", "text/css");
  cssResourceNode.setAttribute("data-insert-from", "viewer");
  cssResourceNode.innerHTML = cssResource;
  if (document.head) {
    document.head.append(cssResourceNode);
  } else if (document.documentElement) {
    if (document.documentElement.childNodes.length === 0) {
      document.documentElement.appendChild(cssResourceNode);
    } else {
      document.documentElement.insertBefore(
        cssResourceNode,
        document.documentElement.childNodes[
          document.documentElement.childNodes.length - 1
        ]
      );
    }
  } else {
    throw new Error("未找到可以插入到页面中的元素");
  }
})();
 
/*!
 * Viewer.js v1.11.6
 * https://fengyuanchen.github.io/viewerjs
 *
 * Copyright 2015-present Chen Fengyuan
 * Released under the MIT license
 *
 * Date: 2023-09-17T03:16:38.052Z
 */
 
(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(e, r) {
    var t = Object.keys(e);
    if (Object.getOwnPropertySymbols) {
      var o = Object.getOwnPropertySymbols(e);
      r &&
        (o = o.filter(function (r) {
          return Object.getOwnPropertyDescriptor(e, r).enumerable;
        })),
        t.push.apply(t, o);
    }
    return t;
  }
  function _objectSpread2(e) {
    for (var r = 1; r < arguments.length; r++) {
      var t = null != arguments[r] ? arguments[r] : {};
      r % 2
        ? ownKeys(Object(t), !0).forEach(function (r) {
            _defineProperty(e, r, t[r]);
          })
        : Object.getOwnPropertyDescriptors
        ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t))
        : ownKeys(Object(t)).forEach(function (r) {
            Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r));
          });
    }
    return e;
  }
  function _typeof(o) {
    "@babel/helpers - typeof";
 
    return (
      (_typeof =
        "function" == typeof Symbol && "symbol" == typeof Symbol.iterator
          ? function (o) {
              return typeof o;
            }
          : function (o) {
              return o &&
                "function" == typeof Symbol &&
                o.constructor === Symbol &&
                o !== Symbol.prototype
                ? "symbol"
                : typeof o;
            }),
      _typeof(o)
    );
  }
  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 &&
    /Version\/\d+(\.\d+)+?\s+Safari/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() {
      var image = this.image;
      if (image) {
        if (this.viewing) {
          this.viewing.abort();
        }
        image.parentNode.removeChild(image);
        this.image = null;
        this.title.innerHTML = "";
      }
    },
  };
 
  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();
      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.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.fulled = false;
      this.viewed = false;
      this.isShown = false;
      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:
          if (offsetX !== 0 || offsetY !== 0) {
            this.pointerMoved = true;
            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;
});