text: /*!
   * Viewer.js v1.0.0-beta.1
   * https://github.com/fengyuanchen/viewerjs
   *
   * Copyright (c) 2015-2017 Chen Fengyuan
   * Released under the MIT license
   *
   * Date: 2017-12-23T04:31:53.438Z
   */
  
  (function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define(factory) :
    (global.Viewer = factory());
  }(this, (function () { 'use strict';
  
  var DEFAULTS = {
    // Enable inline mode
    inline: false,
  
    // Show the button on the top-right of the viewer
    button: true,
  
    // Show the navbar
    navbar: true,
  
    // Show the title
    title: true,
  
    // Show the toolbar
    toolbar: true,
  
    // Show the tooltip with image ratio (percentage) when zoom in or zoom out
    tooltip: true,
  
    // Enable to move the image
    movable: true,
  
    // Enable to zoom the image
    zoomable: true,
  
    // Enable to rotate the image
    rotatable: true,
  
    // Enable to scale the image
    scalable: true,
  
    // Enable CSS3 Transition for some special elements
    transition: true,
  
    // Enable to request fullscreen when play
    fullscreen: true,
  
    // Enable keyboard support
    keyboard: true,
  
    // Enable a modal backdrop, specify `static` for a backdrop which doesn't close the modal on click
    backdrop: true,
  
    // Enable loop viewing.
    loop: false,
  
    // Min width of the viewer in inline mode
    minWidth: 200,
  
    // Min height of the viewer in inline mode
    minHeight: 100,
  
    // Define the ratio when zoom the image by wheeling mouse
    zoomRatio: 0.1,
  
    // Define the min ratio of the image when zoom out
    minZoomRatio: 0.01,
  
    // Define the max ratio of the image when zoom in
    maxZoomRatio: 100,
  
    // Define the CSS `z-index` value of viewer in modal mode.
    zIndex: 2015,
  
    // Define the CSS `z-index` value of viewer in inline mode.
    zIndexInline: 0,
  
    // Define where to get the original image URL for viewing
    // Type: String (an image attribute) or Function (should return an image URL)
    url: 'src',
  
    // Filter the images for viewing.
    // Type: Function (return true if the image is viewable)
    filter: null,
  
    // Event shortcuts
    ready: null,
    show: null,
    shown: null,
    hide: null,
    hidden: null,
    view: null,
    viewed: null
  };
  
  var TEMPLATE = '<div class="viewer-container">' + '<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"></ul>' + '</div>' + '</div>' + '<div class="viewer-tooltip"></div>' + '<div role="button" class="viewer-button" data-action="mix"></div>' + '<div class="viewer-player"></div>' + '</div>';
  
  var WINDOW = typeof window !== 'undefined' ? window : {};
  var NAMESPACE = 'viewer';
  
  // Actions
  var ACTION_MOVE = 'move';
  var ACTION_SWITCH = 'switch';
  var ACTION_ZOOM = 'zoom';
  
  // Classes
  var CLASS_ACTIVE = NAMESPACE + '-active';
  var CLASS_CLOSE = NAMESPACE + '-close';
  var CLASS_FADE = NAMESPACE + '-fade';
  var CLASS_FIXED = NAMESPACE + '-fixed';
  var CLASS_FULLSCREEN = NAMESPACE + '-fullscreen';
  var CLASS_FULLSCREEN_EXIT = NAMESPACE + '-fullscreen-exit';
  var CLASS_HIDE = NAMESPACE + '-hide';
  var CLASS_HIDE_MD_DOWN = NAMESPACE + '-hide-md-down';
  var CLASS_HIDE_SM_DOWN = NAMESPACE + '-hide-sm-down';
  var CLASS_HIDE_XS_DOWN = NAMESPACE + '-hide-xs-down';
  var CLASS_IN = NAMESPACE + '-in';
  var CLASS_INVISIBLE = NAMESPACE + '-invisible';
  var CLASS_MOVE = NAMESPACE + '-move';
  var CLASS_OPEN = NAMESPACE + '-open';
  var CLASS_SHOW = NAMESPACE + '-show';
  var CLASS_TRANSITION = NAMESPACE + '-transition';
  
  // 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_CLICK = 'click';
  var EVENT_DRAG_START = 'dragstart';
  var EVENT_KEY_DOWN = 'keydown';
  var EVENT_LOAD = 'load';
  var EVENT_POINTER_DOWN = WINDOW.PointerEvent ? 'pointerdown' : 'touchstart mousedown';
  var EVENT_POINTER_MOVE = WINDOW.PointerEvent ? 'pointermove' : 'mousemove touchmove';
  var EVENT_POINTER_UP = WINDOW.PointerEvent ? 'pointerup pointercancel' : 'touchend touchcancel mouseup';
  var EVENT_RESIZE = 'resize';
  var EVENT_TRANSITION_END = 'transitionend';
  var EVENT_WHEEL = 'wheel mousewheel DOMMouseScroll';
  
  var BUTTONS = ['zoom-in', 'zoom-out', 'one-to-one', 'reset', 'prev', 'play', 'next', 'rotate-left', 'rotate-right', 'flip-horizontal', 'flip-vertical'];
  
  var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
    return typeof obj;
  } : function (obj) {
    return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
  };
  
  
  
  
  
  
  
  
  
  
  
  var classCallCheck = function (instance, Constructor) {
    if (!(instance instanceof Constructor)) {
      throw new TypeError("Cannot call a class as a function");
    }
  };
  
  var createClass = 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, descriptor.key, descriptor);
      }
    }
  
    return function (Constructor, protoProps, staticProps) {
      if (protoProps) defineProperties(Constructor.prototype, protoProps);
      if (staticProps) defineProperties(Constructor, staticProps);
      return Constructor;
    };
  }();
  
  /**
   * 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 === 'undefined' ? 'undefined' : _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 (e) {
      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 each(data, callback) {
    if (data && isFunction(callback)) {
      if (Array.isArray(data) || isNumber(data.length) /* array-like */) {
          var length = data.length;
  
          var i = void 0;
  
          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.
   */
  function extend(obj) {
    for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      args[_key - 1] = arguments[_key];
    }
  
    if (isObject(obj) && args.length > 0) {
      if (Object.assign) {
        return Object.assign.apply(Object, [obj].concat(args));
      }
  
      args.forEach(function (arg) {
        if (isObject(arg)) {
          Object.keys(arg).forEach(function (key) {
            obj[key] = arg[key];
          });
        }
      });
    }
  
    return obj;
  }
  
  /**
   * Takes a function and returns a new one that will always have a particular context.
   * @param {Function} fn - The target function.
   * @param {Object} context - The new context for the function.
   * @returns {Function} The new function.
   */
  function proxy(fn, context) {
    for (var _len2 = arguments.length, args = Array(_len2 > 2 ? _len2 - 2 : 0), _key2 = 2; _key2 < _len2; _key2++) {
      args[_key2 - 2] = arguments[_key2];
    }
  
    return function () {
      for (var _len3 = arguments.length, args2 = Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
        args2[_key3] = arguments[_key3];
      }
  
      return fn.apply(context, args.concat(args2));
    };
  }
  
  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;
  
  
    each(styles, function (value, property) {
      if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
        value += 'px';
      }
  
      style[property] = value;
    });
  }
  
  /**
   * Get the styles from the given element.
   * @param {Element} element - The target element.
   * @returns {Object} The styles of the element.
   */
  function getStyle(element) {
    return window.getComputedStyle ? window.getComputedStyle(element, null) : element.currentStyle;
  }
  
  /**
   * 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) {
    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 (!value) {
      return;
    }
  
    if (isNumber(element.length)) {
      each(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 = className + ' ' + 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 (!value) {
      return;
    }
  
    if (isNumber(element.length)) {
      each(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)) {
      each(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;
  
  /**
   * Hyphenate the given value.
   * @param {string} value - The value to hyphenate.
   * @returns {string} The hyphenated 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];
    } else if (element.dataset) {
      return element.dataset[name];
    }
  
    return element.getAttribute('data-' + 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-' + hyphenate(name), data);
    }
  }
  
  /**
   * Remove data from the given element.
   * @param {Element} element - The target element.
   * @param {string} name - The data key to remove.
   */
  function removeData(element, name) {
    if (isObject(element[name])) {
      try {
        delete element[name];
      } catch (e) {
        element[name] = null;
      }
    } else if (element.dataset) {
      try {
        delete element.dataset[name];
      } catch (e) {
        element.dataset[name] = null;
      }
    } else {
      element.removeAttribute('data-' + hyphenate(name));
    }
  }
  
  var REGEXP_SPACES = /\s+/;
  
  /**
   * 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] : {};
  
    if (!isFunction(listener)) {
      return;
    }
  
    var types = type.trim().split(REGEXP_SPACES);
  
    if (types.length > 1) {
      each(types, function (t) {
        removeListener(element, t, listener, options);
      });
      return;
    }
  
    if (element.removeEventListener) {
      element.removeEventListener(type, listener, options);
    } else if (element.detachEvent) {
      element.detachEvent('on' + type, listener);
    }
  }
  
  /**
   * 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] : {};
  
    if (!isFunction(_listener)) {
      return;
    }
  
    var types = type.trim().split(REGEXP_SPACES);
  
    if (types.length > 1) {
      each(types, function (t) {
        addListener(element, t, _listener, options);
      });
      return;
    }
  
    if (options.once) {
      var originalListener = _listener;
  
      _listener = function listener() {
        for (var _len4 = arguments.length, args = Array(_len4), _key4 = 0; _key4 < _len4; _key4++) {
          args[_key4] = arguments[_key4];
        }
  
        removeListener(element, type, _listener, options);
        return originalListener.apply(element, args);
      };
    }
  
    if (element.addEventListener) {
      element.addEventListener(type, _listener, options);
    } else if (element.attachEvent) {
      element.attachEvent('on' + type, _listener);
    }
  }
  
  /**
   * 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.
   * @returns {boolean} Indicate if the event is default prevented or not.
   */
  function dispatchEvent(element, type, data) {
    if (element.dispatchEvent) {
      var event = void 0;
  
      // Event and CustomEvent on IE9-11 are global objects, not constructors
      if (isFunction(Event) && isFunction(CustomEvent)) {
        if (isUndefined(data)) {
          event = new Event(type, {
            bubbles: true,
            cancelable: true
          });
        } else {
          event = new CustomEvent(type, {
            detail: data,
            bubbles: true,
            cancelable: true
          });
        }
      } else if (isUndefined(data)) {
        event = document.createEvent('Event');
        event.initEvent(type, true, true);
      } else {
        event = document.createEvent('CustomEvent');
        event.initCustomEvent(type, true, true, data);
      }
  
      // IE9+
      return element.dispatchEvent(event);
    } else if (element.fireEvent) {
      // IE6-10 (native events only)
      return element.fireEvent('on' + type);
    }
  
    return true;
  }
  
  /**
   * Get the offset base on the document.
   * @param {Element} element - The target element.
   * @returns {Object} The offset data.
   */
  function getOffset(element) {
    var doc = document.documentElement;
    var box = element.getBoundingClientRect();
  
    return {
      left: box.left + ((window.scrollX || doc && doc.scrollLeft || 0) - (doc && doc.clientLeft || 0)),
      top: box.top + ((window.scrollY || doc && doc.scrollTop || 0) - (doc && doc.clientTop || 0))
    };
  }
  
  /**
   * Empty an element.
   * @param {Element} element - The element to empty.
   */
  function empty(element) {
    while (element.firstChild) {
      element.removeChild(element.firstChild);
    }
  }
  
  /**
   * 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;
  
    var values = [];
  
    if (isNumber(rotate) && rotate !== 0) {
      values.push('rotate(' + rotate + 'deg)');
    }
  
    if (isNumber(scaleX) && scaleX !== 1) {
      values.push('scaleX(' + scaleX + ')');
    }
  
    if (isNumber(scaleY) && scaleY !== 1) {
      values.push('scaleY(' + 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('http://domain.com/path/to/picture.jpg?size=1280×960')
   * @returns {string} A string contains the image name.
   */
  function getImageNameFromURL(url) {
    return isString(url) ? url.replace(/^.*\//, '').replace(/[?&#].*$/, '') : '';
  }
  
  var navigator = WINDOW.navigator;
  
  var IS_SAFARI_OR_UIWEBVIEW = navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(navigator.userAgent);
  
  /**
   * Get an image's natural sizes.
   * @param {string} image - The target image.
   * @param {Function} callback - The callback function.
   */
  function getImageNaturalSizes(image, callback) {
    // Modern browsers (except Safari)
    if (image.naturalWidth && !IS_SAFARI_OR_UIWEBVIEW) {
      callback(image.naturalWidth, image.naturalHeight);
      return;
    }
  
    var newImage = document.createElement('img');
    var body = document.body || document.documentElement;
  
    newImage.onload = function () {
      callback(newImage.width, newImage.height);
      body.removeChild(newImage);
    };
  
    newImage.src = image.src;
    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);
  }
  
  /**
   * 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 = extend({}, pointers);
    var ratios = [];
  
    each(pointers, function (pointer, pointerId) {
      delete pointers2[pointerId];
  
      each(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
    };
  
    if (endOnly) {
      return end;
    }
  
    return extend({
      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;
  
    each(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();
    },
    initContainer: function initContainer() {
      this.containerData = {
        width: window.innerWidth,
        height: window.innerHeight
      };
    },
    initViewer: function initViewer() {
      var options = this.options,
          parent = this.parent;
  
      var viewerData = void 0;
  
      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 = extend({}, 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 = [];
  
      each(this.images, function (image, i) {
        var src = image.src;
  
        var alt = image.alt || getImageNameFromURL(src);
        var url = options.url;
  
  
        if (isString(url)) {
          url = image.getAttribute(url);
        } else if (isFunction(url)) {
          url = url.call(image, image);
        }
  
        if (src || url) {
          items.push('<li>' + '<img' + (' src="' + (src || url) + '"') + ' role="button"' + ' data-action="view"' + (' data-index="' + i + '"') + (' data-original-url="' + (url || src) + '"') + (' alt="' + alt + '"') + '>' + '</li>');
        }
      });
  
      list.innerHTML = items.join('');
  
      each(list.getElementsByTagName('img'), function (image) {
        setData(image, 'filled', true);
        addListener(image, EVENT_LOAD, proxy(_this.loadImage, _this), {
          once: true
        });
      });
  
      this.items = list.getElementsByTagName('li');
  
      if (options.transition) {
        addListener(element, EVENT_VIEWED, function () {
          addClass(list, CLASS_TRANSITION);
        }, {
          once: true
        });
      }
    },
    renderList: function renderList(index) {
      var i = index || this.index;
      var width = this.items[i].offsetWidth || 30;
      var outerWidth = width + 1; // 1 pixel of `margin-left` width
  
      // Place the active item in the center of the screen
      setStyle(this.list, {
        width: outerWidth * this.length,
        marginLeft: (this.viewerData.width - width) / 2 - outerWidth * i
      });
    },
    resetList: function resetList() {
      empty(this.list);
      removeClass(this.list, CLASS_TRANSITION);
      setStyle({
        marginLeft: 0
      });
    },
    initImage: function initImage(callback) {
      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 || {};
  
      getImageNaturalSizes(image, function (naturalWidth, naturalHeight) {
        var aspectRatio = naturalWidth / naturalHeight;
        var width = viewerWidth;
        var height = viewerHeight;
  
        if (viewerHeight * aspectRatio > viewerWidth) {
          height = viewerWidth / aspectRatio;
        } else {
          width = viewerHeight * aspectRatio;
        }
  
        width = Math.min(width * 0.9, naturalWidth);
        height = Math.min(height * 0.9, naturalHeight);
  
        var imageData = {
          naturalWidth: naturalWidth,
          naturalHeight: naturalHeight,
          aspectRatio: aspectRatio,
          ratio: width / naturalWidth,
          width: width,
          height: height,
          left: (viewerWidth - width) / 2,
          top: (viewerHeight - height) / 2
        };
        var initialImageData = extend({}, 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 (isFunction(callback)) {
          callback();
        }
      });
    },
    renderImage: function renderImage(callback) {
      var image = this.image,
          imageData = this.imageData;
  
  
      setStyle(image, extend({
        width: imageData.width,
        height: imageData.height,
        marginLeft: imageData.left,
        marginTop: imageData.top
      }, getTransforms(imageData)));
  
      if (isFunction(callback)) {
        if (this.transitioning) {
          addListener(image, EVENT_TRANSITION_END, callback, {
            once: true
          });
        } else {
          callback();
        }
      }
    },
    resetImage: function resetImage() {
      var image = this.image;
  
      // this.image only defined after viewed
  
      if (image) {
        image.parentNode.removeChild(image);
        this.image = null;
      }
    }
  };
  
  var events = {
    bind: function bind() {
      var element = this.element,
          options = this.options,
          viewer = this.viewer;
  
  
      if (isFunction(options.view)) {
        addListener(element, EVENT_VIEW, options.view);
      }
  
      if (isFunction(options.viewed)) {
        addListener(element, EVENT_VIEWED, options.viewed);
      }
  
      addListener(viewer, EVENT_CLICK, this.onClick = proxy(this.click, this));
      // addListener(viewer, EVENT_WHEEL, this.onWheel = proxy(this.wheel, this));
      addListener(viewer, EVENT_DRAG_START, this.onDragStart = proxy(this.dragstart, this));
      addListener(this.canvas, EVENT_POINTER_DOWN, this.onPointerDown = proxy(this.pointerdown, this));
      addListener(element.ownerDocument, EVENT_POINTER_MOVE, this.onPointerMove = proxy(this.pointermove, this));
      addListener(element.ownerDocument, EVENT_POINTER_UP, this.onPointerUp = proxy(this.pointerup, this));
      addListener(element.ownerDocument, EVENT_KEY_DOWN, this.onKeyDown = proxy(this.keydown, this));
      addListener(window, EVENT_RESIZE, this.onResize = proxy(this.resize, this));
    },
    unbind: function unbind() {
      var element = this.element,
          options = this.options,
          viewer = this.viewer;
  
  
      if (isFunction(options.view)) {
        removeListener(element, EVENT_VIEW, options.view);
      }
  
      if (isFunction(options.viewed)) {
        removeListener(element, EVENT_VIEWED, options.viewed);
      }
  
      removeListener(viewer, EVENT_CLICK, this.onClick);
      // removeListener(viewer, EVENT_WHEEL, this.onWheel);
      removeListener(viewer, EVENT_DRAG_START, this.onDragStart);
      removeListener(this.canvas, EVENT_POINTER_DOWN, this.onPointerDown);
      removeListener(element.ownerDocument, EVENT_POINTER_MOVE, this.onPointerMove);
      removeListener(element.ownerDocument, EVENT_POINTER_UP, this.onPointerUp);
      removeListener(element.ownerDocument, EVENT_KEY_DOWN, this.onKeyDown);
      removeListener(window, EVENT_RESIZE, this.onResize);
    }
  };
  
  var handlers = {
    click: function click(_ref) {
      var target = _ref.target;
      var options = this.options,
          imageData = this.imageData;
  
      var action = getData(target, 'action');
  
      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':
          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();
          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();
          }
      }
    },
    load: function load() {
      var _this = this;
  
      var options = this.options,
          image = this.image,
          index = this.index,
          viewerData = this.viewerData;
  
  
      if (this.timeout) {
        clearTimeout(this.timeout);
        this.timeout = false;
      }
  
      if (!image) {
        return;
      }
  
      removeClass(image, CLASS_INVISIBLE);
  
      image.style.cssText = 'width:0;' + 'height:0;' + ('margin-left:' + viewerData.width / 2 + 'px;') + ('margin-top:' + viewerData.height / 2 + 'px;') + 'max-width:none!important;' + 'visibility:visible;';
  
      this.initImage(function () {
        toggleClass(image, CLASS_TRANSITION, options.transition);
        toggleClass(image, CLASS_MOVE, options.movable);
  
        _this.renderImage(function () {
          _this.viewed = true;
          dispatchEvent(_this.element, EVENT_VIEWED, {
            originalImage: _this.images[index],
            index: index,
            image: image
          });
        });
      });
    },
    loadImage: function loadImage(e) {
      var image = e.target;
      var parent = image.parentNode;
      var parentWidth = parent.offsetWidth || 30;
      var parentHeight = parent.offsetHeight || 50;
      var filled = !!getData(image, 'filled');
  
      getImageNaturalSizes(image, 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, {
          width: width,
          height: height,
          marginLeft: (parentWidth - width) / 2,
          marginTop: (parentHeight - height) / 2
        });
      });
    },
    keydown: function keydown(e) {
      var options = this.options;
  
      var key = e.keyCode || e.which || e.charCode;
  
      if (!this.fulled || !options.keyboard) {
        return;
      }
  
      switch (key) {
        // (Key: Esc)
        case 27:
          if (this.played) {
            this.stop();
          } else if (options.inline) {
            if (this.fulled) {
              this.exit();
            }
          } else {
            this.hide();
          }
  
          break;
  
        // (Key: Space)
        case 32:
          if (this.played) {
            this.stop();
          }
  
          break;
  
        // View previous (Key: ←)
        case 37:
          this.prev(options.loop);
          break;
  
        // Zoom in (Key: ↑)
        case 38:
  
          // Prevent scroll on Firefox
          e.preventDefault();
  
          this.zoom(options.zoomRatio, true);
          break;
  
        // View next (Key: →)
        case 39:
          this.next(options.loop);
          break;
  
        // Zoom out (Key: ↓)
        case 40:
  
          // Prevent scroll on Firefox
          e.preventDefault();
  
          this.zoom(-options.zoomRatio, true);
          break;
  
        // Zoom out to initial size (Key: Ctrl + 0)
        case 48:
        // Fall through
  
        // Zoom in to natural size (Key: Ctrl + 1)
        // eslint-disable-next-line
        case 49:
          if (e.ctrlKey || e.shiftKey) {
            e.preventDefault();
            this.toggle();
          }
  
          break;
  
        default:
      }
    },
    dragstart: function dragstart(e) {
      if (e.target.tagName.toLowerCase() === 'img') {
        e.preventDefault();
      }
    },
    pointerdown: function pointerdown(e) {
      var options = this.options,
          pointers = this.pointers;
  
  
      if (!this.viewed || this.transitioning) {
        return;
      }
  
      if (e.changedTouches) {
        each(e.changedTouches, function (touch) {
          pointers[touch.identifier] = getPointer(touch);
        });
      } else {
        pointers[e.pointerId || 0] = getPointer(e);
      }
  
      var action = options.movable ? ACTION_MOVE : false;
  
      if (Object.keys(pointers).length > 1) {
        action = ACTION_ZOOM;
      } else if ((e.pointerType === 'touch' || e.type === 'touchstart') && this.isSwitchable()) {
        action = ACTION_SWITCH;
      }
  
      this.action = action;
    },
    pointermove: function pointermove(e) {
      var options = this.options,
          pointers = this.pointers,
          action = this.action,
          image = this.image;
  
  
      if (!this.viewed || !action) {
        return;
      }
  
      e.preventDefault();
  
      if (e.changedTouches) {
        each(e.changedTouches, function (touch) {
          extend(pointers[touch.identifier], getPointer(touch, true));
        });
      } else {
        extend(pointers[e.pointerId || 0], getPointer(e, true));
      }
  
      if (action === ACTION_MOVE && options.transition && hasClass(image, CLASS_TRANSITION)) {
        removeClass(image, CLASS_TRANSITION);
      }
  
      this.change(e);
    },
    pointerup: function pointerup(e) {
      var action = this.action,
          pointers = this.pointers;
  
  
      if (e.changedTouches) {
        each(e.changedTouches, function (touch) {
          delete pointers[touch.identifier];
        });
      } else {
        delete pointers[e.pointerId || 0];
      }
  
      if (!action) {
        return;
      }
  
      if (action === ACTION_MOVE && this.options.transition) {
        addClass(this.image, CLASS_TRANSITION);
      }
  
      this.action = false;
    },
    resize: function resize() {
      var _this2 = this;
  
      this.initContainer();
      this.initViewer();
      this.renderViewer();
      this.renderList();
  
      if (this.viewed) {
        this.initImage(function () {
          _this2.renderImage();
        });
      }
  
      if (this.played) {
        if (this.options.fullscreen && this.fulled && !document.fullscreenElement && !document.mozFullScreenElement && !document.webkitFullscreenElement && !document.msFullscreenElement) {
          this.stop();
          return;
        }
  
        each(this.player.getElementsByTagName('img'), function (image) {
          addListener(image, EVENT_LOAD, proxy(_this2.loadImage, _this2), {
            once: true
          });
          dispatchEvent(image, EVENT_LOAD);
        });
      }
    },
    start: function start(_ref2) {
      var target = _ref2.target;
  
      if (target.tagName.toLowerCase() === 'img' && this.images.indexOf(target) !== -1) {
        this.target = target;
        this.show();
      }
    },
    wheel: function wheel(e) {
      var _this3 = this;
  
      if (!this.viewed) {
        return;
      }
  
      e.preventDefault();
  
      // Limit wheel speed to prevent zoom too fast
      if (this.wheeling) {
        return;
      }
  
      this.wheeling = true;
  
      setTimeout(function () {
        _this3.wheeling = false;
      }, 50);
  
      var ratio = Number(this.options.zoomRatio) || 0.1;
      var delta = 1;
  
      if (e.deltaY) {
        delta = e.deltaY > 0 ? 1 : -1;
      } else if (e.wheelDelta) {
        delta = -e.wheelDelta / 120;
      } else if (e.detail) {
        delta = e.detail > 0 ? 1 : -1;
      }
  
      this.zoom(-delta * ratio, true, e);
    }
  };
  
  var methods = {
    // Show the viewer (only available in modal mode)
    show: function show() {
      var _this = this;
  
      var element = this.element,
          options = this.options;
  
  
      if (options.inline || this.transitioning || this.visible) {
        return this;
      }
  
      if (!this.ready) {
        this.build();
      }
  
      if (isFunction(options.show)) {
        addListener(element, EVENT_SHOW, options.show, {
          once: true
        });
      }
  
      if (dispatchEvent(element, EVENT_SHOW) === false) {
        return this;
      }
  
      this.open();
  
      var viewer = this.viewer;
  
  
      removeClass(viewer, CLASS_HIDE);
      addListener(element, EVENT_SHOWN, function () {
        _this.view(_this.target ? [].concat(_this.images).indexOf(_this.target) : _this.index);
        _this.target = false;
      }, {
        once: true
      });
  
      if (options.transition) {
        this.transitioning = true;
        addClass(viewer, CLASS_TRANSITION);
  
        // Force reflow to enable CSS3 transition
        // eslint-disable-next-line
        viewer.offsetWidth;
        addListener(viewer, EVENT_TRANSITION_END, proxy(this.shown, this), {
          once: true
        });
        addClass(viewer, CLASS_IN);
      } else {
        addClass(viewer, CLASS_IN);
        this.shown();
      }
  
      return this;
    },
  
  
    // Hide the viewer (only available in modal mode)
    hide: function hide() {
      var _this2 = this;
  
      var element = this.element,
          options = this.options,
          viewer = this.viewer;
  
  
      if (options.inline || this.transitioning || !this.visible) {
        return this;
      }
  
      if (isFunction(options.hide)) {
        addListener(element, EVENT_HIDE, options.hide, {
          once: true
        });
      }
  
      if (dispatchEvent(element, EVENT_HIDE) === false) {
        return this;
      }
  
      if (this.viewed && options.transition) {
        this.transitioning = true;
        addListener(this.image, EVENT_TRANSITION_END, function () {
          addListener(viewer, EVENT_TRANSITION_END, proxy(_this2.hidden, _this2), {
            once: true
          });
          removeClass(viewer, CLASS_IN);
        }, {
          once: true
        });
        this.zoomTo(0, false, false, true);
      } else {
        removeClass(viewer, CLASS_IN);
        this.hidden();
      }
  
      return this;
    },
  
  
    /**
     * View one of the images with image's index
     * @param {number} index - The index of the image to view.
     * @returns {Object} this
     */
    view: function view(index) {
      var _this3 = this;
  
      var element = this.element,
          title = this.title,
          canvas = this.canvas;
  
  
      index = Number(index) || 0;
  
      if (!this.ready || !this.visible || this.played || index < 0 || index >= this.length || this.viewed && index === this.index) {
        return this;
      }
  
      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');
  
      image.src = url;
      image.alt = alt;
  
      if (dispatchEvent(element, EVENT_VIEW, {
        originalImage: this.images[index],
        index: index,
        image: image
      }) === false) {
        return this;
      }
  
      this.image = image;
  
      removeClass(this.items[this.index], CLASS_ACTIVE);
      addClass(item, CLASS_ACTIVE);
  
      this.viewed = false;
      this.index = index;
      this.imageData = null;
  
      addClass(image, CLASS_INVISIBLE);
      empty(canvas);
      canvas.appendChild(image);
  
      // Center current item
      this.renderList();
  
      // Clear title
      empty(title);
  
      // Generate title after viewed
      addListener(element, EVENT_VIEWED, function () {
        var imageData = _this3.imageData;
  
  
        title.textContent = alt + ' (' + imageData.naturalWidth + ' \xD7 ' + imageData.naturalHeight + ')';
      }, {
        once: true
      });
  
      if (image.complete) {
        this.load();
      } else {
        addListener(image, EVENT_LOAD, proxy(this.load, this), {
          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);
          _this3.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 {Object} 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 {Object} 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} offsetX - The relative offset distance on the x-axis.
     * @param {number} offsetY - The relative offset distance on the y-axis.
     * @returns {Object} this
     */
    move: function move(offsetX, offsetY) {
      var imageData = this.imageData;
  
  
      this.moveTo(isUndefined(offsetX) ? offsetX : imageData.left + Number(offsetX), isUndefined(offsetY) ? offsetY : imageData.top + Number(offsetY));
  
      return this;
    },
  
  
    /**
     * Move the image to an absolute point.
     * @param {number} x - The x-axis coordinate.
     * @param {number} [y=x] - The y-axis coordinate.
     * @returns {Object} this
     */
    moveTo: function moveTo(x) {
      var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
      var imageData = this.imageData;
  
  
      x = Number(x);
      y = Number(y);
  
      if (this.viewed && !this.played && this.options.movable) {
        var changed = false;
  
        if (isNumber(x)) {
          imageData.left = x;
          changed = true;
        }
  
        if (isNumber(y)) {
          imageData.top = y;
          changed = true;
        }
  
        if (changed) {
          this.renderImage();
        }
      }
  
      return this;
    },
  
  
    /**
     * Zoom the image with a relative ratio.
     * @param {number} ratio - The target ratio.
     * @param {boolean} [hasTooltip=false] - Indicates if it has a tooltip or not.
     * @param {Event} [_originalEvent=null] - The original event if any.
     * @returns {Object} this
     */
    zoom: function zoom(ratio) {
      var hasTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
  
      var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 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, hasTooltip, _originalEvent);
  
      return this;
    },
  
  
    /**
     * Zoom the image to an absolute ratio.
     * @param {number} ratio - The target ratio.
     * @param {boolean} [hasTooltip=false] - Indicates if it has a tooltip or not.
     * @param {Event} [_originalEvent=null] - The original event if any.
     * @param {Event} [_zoomable=false] - Indicates if the current zoom is available or not.
     * @returns {Object} this
     */
    zoomTo: function zoomTo(ratio) {
      var hasTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
  
      var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
  
      var _zoomable = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
  
      var options = this.options,
          pointers = this.pointers,
          imageData = this.imageData;
  
  
      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 && ratio > 0.95 && ratio < 1.05) {
          ratio = 1;
        }
  
        var newWidth = imageData.naturalWidth * ratio;
        var newHeight = imageData.naturalHeight * ratio;
  
        if (_originalEvent) {
          var offset = getOffset(this.viewer);
          var center = pointers && Object.keys(pointers).length ? getPointersCenter(pointers) : {
            pageX: _originalEvent.pageX,
            pageY: _originalEvent.pageY
          };
  
          // Zoom from the triggering point of the event
          imageData.left -= (newWidth - imageData.width) * ((center.pageX - offset.left - imageData.left) / imageData.width);
          imageData.top -= (newHeight - imageData.height) * ((center.pageY - offset.top - imageData.top) / imageData.height);
        } else {
          // Zoom from the center of the image
          imageData.left -= (newWidth - imageData.width) / 2;
          imageData.top -= (newHeight - imageData.height) / 2;
        }
  
        imageData.width = newWidth;
        imageData.height = newHeight;
        imageData.ratio = ratio;
        this.renderImage();
  
        if (hasTooltip) {
          this.tooltip();
        }
      }
  
      return this;
    },
  
  
    /**
     * Rotate the image with a relative degree.
     * @param {number} degree - The rotate degree.
     * @returns {Object} 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 {Object} this
     */
    rotateTo: function rotateTo(degree) {
      var imageData = this.imageData;
  
  
      degree = Number(degree);
  
      if (isNumber(degree) && this.viewed && !this.played && this.options.rotatable) {
        imageData.rotate = degree;
        this.renderImage();
      }
  
      return this;
    },
  
  
    /**
     * Scale the image on the x-axis.
     * @param {number} scaleX - The scale ratio on the x-axis.
     * @returns {Object} 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 {Object} 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 {Object} this
     */
    scale: function scale(scaleX) {
      var scaleY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : scaleX;
      var imageData = this.imageData;
  
  
      scaleX = Number(scaleX);
      scaleY = Number(scaleY);
  
      if (this.viewed && !this.played && this.options.scalable) {
        var changed = false;
  
        if (isNumber(scaleX)) {
          imageData.scaleX = scaleX;
          changed = true;
        }
  
        if (isNumber(scaleY)) {
          imageData.scaleY = scaleY;
          changed = true;
        }
  
        if (changed) {
          this.renderImage();
        }
      }
  
      return this;
    },
  
  
    // Play the images
    play: function play() {
      var _this4 = this;
  
      var options = this.options,
          player = this.player;
  
      var load = proxy(this.loadImage, this);
      var list = [];
      var total = 0;
      var index = 0;
  
      if (!this.visible || this.played) {
        return this;
      }
  
      if (options.fullscreen) {
        this.requestFullscreen();
      }
  
      this.played = true;
      this.onLoadWhenPlay = load;
      addClass(player, CLASS_SHOW);
  
      each(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');
        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, load, {
          once: true
        });
        player.appendChild(image);
      });
  
      if (isNumber(options.interval) && options.interval > 0) {
        var playing = function playing() {
          _this4.playing = setTimeout(function () {
            removeClass(list[index], CLASS_IN);
            index += 1;
            index = index < total ? index : 0;
            addClass(list[index], CLASS_IN);
  
            playing();
          }, options.interval);
        };
  
        if (total > 1) {
          playing();
        }
      }
  
      return this;
    },
  
  
    // Stop play
    stop: function stop() {
      var _this5 = this;
  
      var player = this.player;
  
  
      if (!this.played) {
        return this;
      }
  
      if (this.options.fullscreen) {
        this.exitFullscreen();
      }
  
      this.played = false;
      clearTimeout(this.playing);
      each(this.player.getElementsByTagName('img'), function (image) {
        if (!image.complete) {
          removeListener(image, EVENT_LOAD, _this5.onLoadWhenPlay);
        }
      });
      removeClass(player, CLASS_SHOW);
      empty(player);
  
      return this;
    },
  
  
    // Enter modal mode (only available in inline mode)
    full: function full() {
      var _this6 = this;
  
      var options = this.options,
          viewer = this.viewer,
          image = this.image,
          list = this.list;
  
  
      if (!this.visible || this.played || this.fulled || !options.inline) {
        return this;
      }
  
      this.fulled = true;
      this.open();
      addClass(this.button, CLASS_FULLSCREEN_EXIT);
  
      if (options.transition) {
        removeClass(image, CLASS_TRANSITION);
        removeClass(list, CLASS_TRANSITION);
      }
  
      addClass(viewer, CLASS_FIXED);
      viewer.setAttribute('style', '');
      setStyle(viewer, {
        zIndex: options.zIndex
      });
  
      this.initContainer();
      this.viewerData = extend({}, this.containerData);
      this.renderList();
      this.initImage(function () {
        _this6.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 _this7 = this;
  
      var options = this.options,
          viewer = this.viewer,
          image = this.image,
          list = this.list;
  
  
      if (!this.fulled) {
        return this;
      }
  
      this.fulled = false;
      this.close();
      removeClass(this.button, CLASS_FULLSCREEN_EXIT);
  
      if (options.transition) {
        removeClass(image, CLASS_TRANSITION);
        removeClass(list, CLASS_TRANSITION);
      }
  
      removeClass(viewer, CLASS_FIXED);
      setStyle(viewer, {
        zIndex: options.zIndexInline
      });
  
      this.viewerData = extend({}, this.parentData);
      this.renderViewer();
      this.renderList();
      this.initImage(function () {
        _this7.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 _this8 = this;
  
      var options = this.options,
          tooltipBox = this.tooltipBox,
          imageData = this.imageData;
  
  
      if (!this.viewed || this.played || !options.tooltip) {
        return this;
      }
  
      tooltipBox.textContent = Math.round(imageData.ratio * 100) + '%';
  
      if (!this.tooltiping) {
        if (options.transition) {
          if (this.fading) {
            dispatchEvent(tooltipBox, EVENT_TRANSITION_END);
          }
  
          addClass(tooltipBox, CLASS_SHOW);
          addClass(tooltipBox, CLASS_FADE);
          addClass(tooltipBox, CLASS_TRANSITION);
  
          // Force reflow to enable CSS3 transition
          // eslint-disable-next-line
          tooltipBox.offsetWidth;
          addClass(tooltipBox, CLASS_IN);
        } else {
          addClass(tooltipBox, CLASS_SHOW);
        }
      } else {
        clearTimeout(this.tooltiping);
      }
  
      this.tooltiping = setTimeout(function () {
        if (options.transition) {
          addListener(tooltipBox, EVENT_TRANSITION_END, function () {
            removeClass(tooltipBox, CLASS_SHOW);
            removeClass(tooltipBox, CLASS_FADE);
            removeClass(tooltipBox, CLASS_TRANSITION);
            _this8.fading = false;
          }, {
            once: true
          });
  
          removeClass(tooltipBox, CLASS_IN);
          _this8.fading = true;
        } else {
          removeClass(tooltipBox, CLASS_SHOW);
        }
  
        _this8.tooltiping = false;
      }, 1000);
  
      return this;
    },
  
  
    // Toggle the image size between its natural size and initial size
    toggle: function toggle() {
      if (this.imageData.ratio === 1) {
        this.zoomTo(this.initialImageData.ratio, true);
      } else {
        this.zoomTo(1, true);
      }
  
      return this;
    },
  
  
    // Reset the image to its initial state
    reset: function reset() {
      if (this.viewed && !this.played) {
        this.imageData = extend({}, this.initialImageData);
        this.renderImage();
      }
  
      return this;
    },
  
  
    // Update viewer when images changed
    update: function update() {
      var element = this.element,
          options = this.options,
          isImg = this.isImg;
  
      var indexes = [];
  
      // Destroy viewer if the target image was deleted
      if (isImg && !element.parentNode) {
        return this.destroy();
      }
  
      var images = [];
  
      each(isImg ? [element] : element.querySelectorAll('img'), function (image) {
        if (options.filter) {
          if (options.filter(image)) {
            images.push(image);
          }
        } else {
          images.push(image);
        }
      });
  
      this.images = images;
      this.length = images.length;
  
      if (this.ready) {
        each(this.items, function (item, i) {
          var img = item.querySelector('img');
          var image = images[i];
  
          if (image) {
            if (image.src !== img.src) {
              indexes.push(i);
            }
          } else {
            indexes.push(i);
          }
        });
  
        setStyle(this.list, {
          width: 'auto'
        });
  
        this.initList();
  
        if (this.visible) {
          if (this.length) {
            if (this.viewed) {
              var index = indexes.indexOf(this.index);
  
              if (index >= 0) {
                this.viewed = false;
                this.view(Math.max(this.index - (index + 1), 0));
              } else {
                addClass(this.items[this.index], CLASS_ACTIVE);
              }
            }
          } else {
            this.image = null;
            this.viewed = false;
            this.index = 0;
            this.imageData = null;
            empty(this.canvas);
            empty(this.title);
          }
        }
      }
  
      return this;
    },
  
  
    // Destroy the viewer
    destroy: function destroy() {
      var element = this.element;
  
  
      if (!getData(element, NAMESPACE)) {
        return this;
      }
  
      if (this.options.inline) {
        this.unbind();
      } else {
        if (this.visible) {
          this.unbind();
        }
  
        removeListener(element, EVENT_CLICK, this.onStart);
      }
  
      this.close();
      this.unbuild();
      removeData(element, NAMESPACE);
      return this;
    }
  };
  
  var others = {
    open: function open() {
      var body = this.body;
  
  
      addClass(body, CLASS_OPEN);
  
      body.style.paddingRight = this.scrollbarWidth + (parseFloat(this.initialBodyPaddingRight) || 0) + 'px';
    },
    close: function close() {
      var body = this.body;
  
  
      if (!body) {
        return;
      }
  
      removeClass(body, CLASS_OPEN);
      body.style.paddingRight = this.initialBodyPaddingRight;
    },
    shown: function shown() {
      var element = this.element,
          options = this.options;
  
  
      this.transitioning = false;
      this.fulled = true;
      this.visible = true;
      this.render();
      this.bind();
  
      if (isFunction(options.shown)) {
        addListener(element, EVENT_SHOWN, options.shown, {
          once: true
        });
      }
  
      dispatchEvent(element, EVENT_SHOWN);
    },
    hidden: function hidden() {
      var element = this.element,
          options = this.options;
  
      this.transitioning = false;
      this.viewed = false;
      this.fulled = false;
      this.visible = false;
      this.close();
      this.unbind();
      addClass(this.viewer, CLASS_HIDE);
      this.resetList();
      this.resetImage();
  
      if (isFunction(options.hidden)) {
        addListener(element, EVENT_HIDDEN, options.hidden, {
          once: true
        });
      }
  
      dispatchEvent(element, EVENT_HIDDEN);
    },
    requestFullscreen: function requestFullscreen() {
      var _window = window,
          document = _window.document;
  
  
      if (this.fulled && !document.fullscreenElement && !document.mozFullScreenElement && !document.webkitFullscreenElement && !document.msFullscreenElement) {
        var documentElement = document.documentElement;
  
  
        if (documentElement.requestFullscreen) {
          documentElement.requestFullscreen();
        } else if (documentElement.msRequestFullscreen) {
          documentElement.msRequestFullscreen();
        } else if (documentElement.mozRequestFullScreen) {
          documentElement.mozRequestFullScreen();
        } else if (documentElement.webkitRequestFullscreen) {
          documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
        }
      }
    },
    exitFullscreen: function exitFullscreen() {
      if (this.fulled) {
        if (document.exitFullscreen) {
          document.exitFullscreen();
        } else if (document.msExitFullscreen) {
          document.msExitFullscreen();
        } else if (document.mozCancelFullScreen) {
          document.mozCancelFullScreen();
        } else if (document.webkitExitFullscreen) {
          document.webkitExitFullscreen();
        }
      }
    },
    change: function change(e) {
      var options = this.options,
          pointers = this.pointers;
  
      var pointer = pointers[Object.keys(pointers)[0]];
      var offsetX = pointer.endX - pointer.startX;
      var offsetY = pointer.endY - pointer.startY;
  
      switch (this.action) {
        // Move the current image
        case ACTION_MOVE:
          this.move(offsetX, offsetY);
          break;
  
        // Zoom the current image
        case ACTION_ZOOM:
          this.zoom(getMaxZoomRatio(pointers), false, e);
          break;
  
        case ACTION_SWITCH:
          this.action = 'switched';
  
          if (Math.abs(offsetX) > Math.abs(offsetY)) {
            if (offsetX > 1) {
              this.prev(options.loop);
            } else if (offsetX < -1) {
              this.next(options.loop);
            }
          }
  
          break;
  
        default:
      }
  
      // Override
      each(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.left >= 0 && imageData.top >= 0 && imageData.width <= viewerData.width && imageData.height <= viewerData.height;
    }
  };
  
  var AnotherViewer = WINDOW.Viewer;
  
  var Viewer = 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 = extend({}, DEFAULTS, isPlainObject(options) && options);
      this.isImg = false;
      this.ready = false;
      this.visible = false;
      this.viewed = false;
      this.fulled = false;
      this.played = false;
      this.wheeling = false;
      this.playing = false;
      this.fading = false;
      this.tooltiping = false;
      this.transitioning = false;
      this.action = false;
      this.target = false;
      this.timeout = false;
      this.index = 0;
      this.length = 0;
      this.pointers = {};
      this.init();
    }
  
    createClass(Viewer, [{
      key: 'init',
      value: function init() {
        var _this = this;
  
        var element = this.element,
            options = this.options;
  
  
        if (getData(element, NAMESPACE)) {
          return;
        }
  
        setData(element, NAMESPACE, this);
  
        var isImg = element.tagName.toLowerCase() === 'img';
        var images = [];
  
        each(isImg ? [element] : element.querySelectorAll('img'), function (image) {
          if (options.filter) {
            if (options.filter(image)) {
              images.push(image);
            }
          } else {
            images.push(image);
          }
        });
  
        var length = images.length;
  
  
        if (!length) {
          return;
        }
  
        if (isFunction(options.ready)) {
          addListener(element, EVENT_READY, options.ready, {
            once: true
          });
        }
  
        // Override `transition` option if it is not supported
        if (isUndefined(document.createElement(NAMESPACE).style.transition)) {
          options.transition = false;
        }
  
        this.isImg = isImg;
        this.length = length;
        this.count = 0;
        this.images = images;
  
        var body = document.body || document.documentElement;
  
        this.body = body;
        this.scrollbarWidth = window.innerWidth - document.documentElement.clientWidth;
        this.initialBodyPaddingRight = getStyle(body).paddingRight;
  
        if (options.inline) {
          var progress = proxy(this.progress, this);
  
          addListener(element, EVENT_READY, function () {
            _this.view();
          }, {
            once: true
          });
  
          each(images, function (image) {
            if (image.complete) {
              progress();
            } else {
              addListener(image, EVENT_LOAD, progress, {
                once: true
              });
            }
          });
        } else {
          addListener(element, EVENT_CLICK, this.onStart = proxy(this.start, this));
        }
      }
    }, {
      key: 'progress',
      value: function progress() {
        this.count += 1;
  
        if (this.count === this.length) {
          this.build();
        }
      }
    }, {
      key: 'build',
      value: function build() {
        var options = this.options;
        var element = this.element;
  
  
        if (this.ready) {
          return;
        }
  
        var parent = element.parentNode;
        var template = document.createElement('div');
  
        template.innerHTML = TEMPLATE;
  
        var viewer = template.querySelector('.' + NAMESPACE + '-container');
        var title = viewer.querySelector('.' + NAMESPACE + '-title');
        var toolbar = viewer.querySelector('.' + NAMESPACE + '-toolbar');
        var navbar = viewer.querySelector('.' + NAMESPACE + '-navbar');
        var button = viewer.querySelector('.' + NAMESPACE + '-button');
        var canvas = viewer.querySelector('.' + 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('.' + NAMESPACE + '-footer');
        this.tooltipBox = viewer.querySelector('.' + NAMESPACE + '-tooltip');
        this.player = viewer.querySelector('.' + NAMESPACE + '-player');
        this.list = viewer.querySelector('.' + NAMESPACE + '-list');
  
        addClass(title, !options.title ? CLASS_HIDE : getResponsiveClass(options.title));
        addClass(navbar, !options.navbar ? CLASS_HIDE : getResponsiveClass(options.navbar));
        toggleClass(button, CLASS_HIDE, !options.button);
  
        if (options.backdrop) {
          addClass(viewer, NAMESPACE + '-backdrop');
  
          if (!options.inline && options.backdrop === true) {
            setData(canvas, 'action', 'hide');
          }
        }
  
        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));
          }
  
          each(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');
  
            item.setAttribute('role', 'button');
            addClass(item, NAMESPACE + '-' + name);
  
            if (!isFunction(click)) {
              setData(item, 'action', name);
            }
  
            if (isNumber(show)) {
              addClass(item, getResponsiveClass(show));
            }
  
            if (['small', 'large'].indexOf(size) !== -1) {
              addClass(item, NAMESPACE + '-' + size);
            } else if (name === 'play') {
              addClass(item, 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);
          each(rotates, function (rotate) {
            toolbar.appendChild(rotate);
          });
        }
  
        if (options.inline) {
          addClass(button, CLASS_FULLSCREEN);
          setStyle(viewer, {
            zIndex: options.zIndexInline
          });
  
          if (getStyle(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
          });
  
          this.body.appendChild(viewer);
        }
  
        if (options.inline) {
          this.render();
          this.bind();
          this.visible = true;
        }
  
        this.ready = true;
  
        dispatchEvent(element, EVENT_READY);
      }
    }, {
      key: 'unbuild',
      value: function unbuild() {
        if (!this.ready) {
          return;
        }
  
        this.ready = false;
        this.viewer.parentNode.removeChild(this.viewer);
      }
  
      /**
       * 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) {
        extend(DEFAULTS, isPlainObject(options) && options);
      }
    }]);
    return Viewer;
  }();
  
  extend(Viewer.prototype, render, events, handlers, methods, others);
  if (typeof window !== 'undefined') {
    AnotherViewer = window.Viewer;
    window.Viewer = Viewer;
  }
  return Viewer;
  
  })));
  