yvan-ext/assets/viewer/viewer.js

/*!
 * Viewer.js v1.10.2
 * https://fengyuanchen.github.io/viewerjs
 *
 * Copyright 2015-present Chen Fengyuan
 * Released under the MIT license
 *
 * Date: 2021-10-22T13:59:51.046Z
 */

(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
            (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Viewer = factory());
})(this, (function () {
    'use strict';

    function ownKeys(object, enumerableOnly) {
        var keys = Object.keys(object);

        if (Object.getOwnPropertySymbols) {
            var symbols = Object.getOwnPropertySymbols(object);

            if (enumerableOnly) {
                symbols = symbols.filter(function (sym) {
                    return Object.getOwnPropertyDescriptor(object, sym).enumerable;
                });
            }

            keys.push.apply(keys, symbols);
        }

        return keys;
    }

    function _objectSpread2(target) {
        for (var i = 1; i < arguments.length; i++) {
            var source = arguments[i] != null ? arguments[i] : {};

            if (i % 2) {
                ownKeys(Object(source), true).forEach(function (key) {
                    _defineProperty(target, key, source[key]);
                });
            } else if (Object.getOwnPropertyDescriptors) {
                Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
            } else {
                ownKeys(Object(source)).forEach(function (key) {
                    Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
                });
            }
        }

        return target;
    }

    function _typeof(obj) {
        "@babel/helpers - typeof";

        if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
            _typeof = function (obj) {
                return typeof obj;
            };
        } else {
            _typeof = function (obj) {
                return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
            };
        }

        return _typeof(obj);
    }

    function _classCallCheck(instance, Constructor) {
        if (!(instance instanceof Constructor)) {
            throw new TypeError("Cannot call a class as a function");
        }
    }

    function _defineProperties(target, props) {
        for (var i = 0; i < props.length; i++) {
            var descriptor = props[i];
            descriptor.enumerable = descriptor.enumerable || false;
            descriptor.configurable = true;
            if ("value" in descriptor) descriptor.writable = true;
            Object.defineProperty(target, descriptor.key, descriptor);
        }
    }

    function _createClass(Constructor, protoProps, staticProps) {
        if (protoProps) _defineProperties(Constructor.prototype, protoProps);
        if (staticProps) _defineProperties(Constructor, staticProps);
        return Constructor;
    }

    function _defineProperty(obj, key, value) {
        if (key in obj) {
            Object.defineProperty(obj, key, {
                value: value,
                enumerable: true,
                configurable: true,
                writable: true
            });
        } else {
            obj[key] = value;
        }

        return obj;
    }

    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 index of image for viewing.
         * @type {number}
         */
        initialViewIndex: 0,

        /**
         * Enable inline mode.
         * @type {boolean}
         */
        inline: false,

        /**
         * The amount of time to delay between automatically cycling an image when playing.
         * @type {number}
         */
        interval: 5000,

        /**
         * Enable keyboard support.
         * @type {boolean}
         */
        keyboard: true,

        /**
         * Focus the viewer when initialized.
         * @type {boolean}
         */
        focus: true,

        /**
         * Indicate if show a loading spinner when load image or not.
         * @type {boolean}
         */
        loading: true,

        /**
         * Indicate if enable loop viewing or not.
         * @type {boolean}
         */
        loop: true,

        /**
         * Min width of the viewer in inline mode.
         * @type {number}
         */
        minWidth: 200,

        /**
         * Min height of the viewer in inline mode.
         * @type {number}
         */
        minHeight: 100,

        /**
         * Enable to move the image.
         * @type {boolean}
         */
        movable: true,

        /**
         * Enable to rotate the image.
         * @type {boolean}
         */
        rotatable: true,

        /**
         * Enable to scale the image.
         * @type {boolean}
         */
        scalable: true,

        /**
         * Enable to zoom the image.
         * @type {boolean}
         */
        zoomable: true,

        /**
         * Enable to zoom the current image by dragging on the touch screen.
         * @type {boolean}
         */
        zoomOnTouch: true,

        /**
         * Enable to zoom the image by wheeling mouse.
         * @type {boolean}
         */
        zoomOnWheel: true,

        /**
         * Enable to slide to the next or previous image by swiping on the touch screen.
         * @type {boolean}
         */
        slideOnTouch: true,

        /**
         * Indicate if toggle the image size between its natural size
         * and initial size when double click on the image or not.
         * @type {boolean}
         */
        toggleOnDblclick: true,

        /**
         * Show the tooltip with image ratio (percentage) when zoom in or zoom out.
         * @type {boolean}
         */
        tooltip: true,

        /**
         * Enable CSS3 Transition for some special elements.
         * @type {boolean}
         */
        transition: true,

        /**
         * Define the CSS `z-index` value of viewer in modal mode.
         * @type {number}
         */
        zIndex: 2015,

        /**
         * Define the CSS `z-index` value of viewer in inline mode.
         * @type {number}
         */
        zIndexInline: 0,

        /**
         * Define the ratio when zoom the image by wheeling mouse.
         * @type {number}
         */
        zoomRatio: 0.1,

        /**
         * Define the min ratio of the image when zoom out.
         * @type {number}
         */
        minZoomRatio: 0.01,

        /**
         * Define the max ratio of the image when zoom in.
         * @type {number}
         */
        maxZoomRatio: 100,

        /**
         * Define where to get the original image URL for viewing.
         * @type {string | Function}
         */
        url: 'src',

        /**
         * Event shortcuts.
         * @type {Function}
         */
        ready: null,
        show: null,
        shown: null,
        hide: null,
        hidden: null,
        view: null,
        viewed: null,
        move: null,
        moved: null,
        rotate: null,
        rotated: null,
        scale: null,
        scaled: null,
        zoom: null,
        zoomed: null,
        play: null,
        stop: null
    };

    var TEMPLATE = '<div class="viewer-container" tabindex="-1" touch-action="none">' + '<div class="viewer-canvas"></div>' + '<div class="viewer-footer">' + '<div class="viewer-title"></div>' + '<div class="viewer-toolbar"></div>' + '<div class="viewer-navbar">' + '<ul class="viewer-list" role="navigation"></ul>' + '</div>' + '</div>' + '<div class="viewer-tooltip" role="alert" aria-hidden="true"></div>' + '<div class="viewer-button" data-viewer-action="mix" role="button"></div>' + '<div class="viewer-player"></div>' + '</div>';

    var IS_BROWSER = typeof window !== 'undefined' && typeof window.document !== 'undefined';
    var WINDOW = IS_BROWSER ? window : {};
    var IS_TOUCH_DEVICE = IS_BROWSER && WINDOW.document.documentElement ? 'ontouchstart' in WINDOW.document.documentElement : false;
    var HAS_POINTER_EVENT = IS_BROWSER ? 'PointerEvent' in WINDOW : false;
    var NAMESPACE = 'viewer'; // Actions

    var ACTION_MOVE = 'move';
    var ACTION_SWITCH = 'switch';
    var ACTION_ZOOM = 'zoom'; // Classes

    var CLASS_ACTIVE = "".concat(NAMESPACE, "-active");
    var CLASS_CLOSE = "".concat(NAMESPACE, "-close");
    var CLASS_FADE = "".concat(NAMESPACE, "-fade");
    var CLASS_FIXED = "".concat(NAMESPACE, "-fixed");
    var CLASS_FULLSCREEN = "".concat(NAMESPACE, "-fullscreen");
    var CLASS_FULLSCREEN_EXIT = "".concat(NAMESPACE, "-fullscreen-exit");
    var CLASS_HIDE = "".concat(NAMESPACE, "-hide");
    var CLASS_HIDE_MD_DOWN = "".concat(NAMESPACE, "-hide-md-down");
    var CLASS_HIDE_SM_DOWN = "".concat(NAMESPACE, "-hide-sm-down");
    var CLASS_HIDE_XS_DOWN = "".concat(NAMESPACE, "-hide-xs-down");
    var CLASS_IN = "".concat(NAMESPACE, "-in");
    var CLASS_INVISIBLE = "".concat(NAMESPACE, "-invisible");
    var CLASS_LOADING = "".concat(NAMESPACE, "-loading");
    var CLASS_MOVE = "".concat(NAMESPACE, "-move");
    var CLASS_OPEN = "".concat(NAMESPACE, "-open");
    var CLASS_SHOW = "".concat(NAMESPACE, "-show");
    var CLASS_TRANSITION = "".concat(NAMESPACE, "-transition"); // Native events

    var EVENT_CLICK = 'click';
    var EVENT_DBLCLICK = 'dblclick';
    var EVENT_DRAG_START = 'dragstart';
    var EVENT_FOCUSIN = 'focusin';
    var EVENT_KEY_DOWN = 'keydown';
    var EVENT_LOAD = 'load';
    var EVENT_ERROR = 'error';
    var EVENT_TOUCH_END = IS_TOUCH_DEVICE ? 'touchend touchcancel' : 'mouseup';
    var EVENT_TOUCH_MOVE = IS_TOUCH_DEVICE ? 'touchmove' : 'mousemove';
    var EVENT_TOUCH_START = IS_TOUCH_DEVICE ? 'touchstart' : 'mousedown';
    var EVENT_POINTER_DOWN = HAS_POINTER_EVENT ? 'pointerdown' : EVENT_TOUCH_START;
    var EVENT_POINTER_MOVE = HAS_POINTER_EVENT ? 'pointermove' : EVENT_TOUCH_MOVE;
    var EVENT_POINTER_UP = HAS_POINTER_EVENT ? 'pointerup pointercancel' : EVENT_TOUCH_END;
    var EVENT_RESIZE = 'resize';
    var EVENT_TRANSITION_END = 'transitionend';
    var EVENT_WHEEL = 'wheel'; // Custom events

    var EVENT_READY = 'ready';
    var EVENT_SHOW = 'show';
    var EVENT_SHOWN = 'shown';
    var EVENT_HIDE = 'hide';
    var EVENT_HIDDEN = 'hidden';
    var EVENT_VIEW = 'view';
    var EVENT_VIEWED = 'viewed';
    var EVENT_MOVE = 'move';
    var EVENT_MOVED = 'moved';
    var EVENT_ROTATE = 'rotate';
    var EVENT_ROTATED = 'rotated';
    var EVENT_SCALE = 'scale';
    var EVENT_SCALED = 'scaled';
    var EVENT_ZOOM = 'zoom';
    var EVENT_ZOOMED = 'zoomed';
    var EVENT_PLAY = 'play';
    var EVENT_STOP = 'stop'; // Data keys

    var DATA_ACTION = "".concat(NAMESPACE, "Action"); // RegExps

    var REGEXP_SPACES = /\s\s*/; // Misc

    var BUTTONS = ['zoom-in', 'zoom-out', 'one-to-one', 'reset', 'prev', 'play', 'next', 'rotate-left', 'rotate-right', 'flip-horizontal', 'flip-vertical'];

    /**
     * Check if the given value is a string.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a string, else `false`.
     */

    function isString(value) {
        return typeof value === 'string';
    }

    /**
     * Check if the given value is not a number.
     */

    var isNaN = Number.isNaN || WINDOW.isNaN;

    /**
     * Check if the given value is a number.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a number, else `false`.
     */

    function isNumber(value) {
        return typeof value === 'number' && !isNaN(value);
    }

    /**
     * Check if the given value is undefined.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is undefined, else `false`.
     */

    function isUndefined(value) {
        return typeof value === 'undefined';
    }

    /**
     * Check if the given value is an object.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is an object, else `false`.
     */

    function isObject(value) {
        return _typeof(value) === 'object' && value !== null;
    }

    var hasOwnProperty = Object.prototype.hasOwnProperty;

    /**
     * Check if the given value is a plain object.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a plain object, else `false`.
     */

    function isPlainObject(value) {
        if (!isObject(value)) {
            return false;
        }

        try {
            var _constructor = value.constructor;
            var prototype = _constructor.prototype;
            return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
        } catch (error) {
            return false;
        }
    }

    /**
     * Check if the given value is a function.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a function, else `false`.
     */

    function isFunction(value) {
        return typeof value === 'function';
    }

    /**
     * Iterate the given data.
     * @param {*} data - The data to iterate.
     * @param {Function} callback - The process function for each element.
     * @returns {*} The original data.
     */

    function forEach(data, callback) {
        if (data && isFunction(callback)) {
            if (Array.isArray(data) || isNumber(data.length)
                /* array-like */
            ) {
                var length = data.length;
                var i;

                for (i = 0; i < length; i += 1) {
                    if (callback.call(data, data[i], i, data) === false) {
                        break;
                    }
                }
            } else if (isObject(data)) {
                Object.keys(data).forEach(function (key) {
                    callback.call(data, data[key], key, data);
                });
            }
        }

        return data;
    }

    /**
     * Extend the given object.
     * @param {*} obj - The object to be extended.
     * @param {*} args - The rest objects which will be merged to the first object.
     * @returns {Object} The extended object.
     */

    var assign = Object.assign || function assign(obj) {
        for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
            args[_key - 1] = arguments[_key];
        }

        if (isObject(obj) && args.length > 0) {
            args.forEach(function (arg) {
                if (isObject(arg)) {
                    Object.keys(arg).forEach(function (key) {
                        obj[key] = arg[key];
                    });
                }
            });
        }

        return obj;
    };
    var REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/;

    /**
     * Apply styles to the given element.
     * @param {Element} element - The target element.
     * @param {Object} styles - The styles for applying.
     */

    function setStyle(element, styles) {
        var style = element.style;
        forEach(styles, function (value, property) {
            if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
                value += 'px';
            }

            style[property] = value;
        });
    }

    /**
     * Escape a string for using in HTML.
     * @param {String} value - The string to escape.
     * @returns {String} Returns the escaped string.
     */

    function escapeHTMLEntities(value) {
        return isString(value) ? value.replace(/&(?!amp;|quot;|#39;|lt;|gt;)/g, '&amp;').replace(/"/g, '&quot;').replace(/'/g, '&#39;').replace(/</g, '&lt;').replace(/>/g, '&gt;') : value;
    }

    /**
     * Check if the given element has a special class.
     * @param {Element} element - The element to check.
     * @param {string} value - The class to search.
     * @returns {boolean} Returns `true` if the special class was found.
     */

    function hasClass(element, value) {
        if (!element || !value) {
            return false;
        }

        return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1;
    }

    /**
     * Add classes to the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be added.
     */

    function addClass(element, value) {
        if (!element || !value) {
            return;
        }

        if (isNumber(element.length)) {
            forEach(element, function (elem) {
                addClass(elem, value);
            });
            return;
        }

        if (element.classList) {
            element.classList.add(value);
            return;
        }

        var className = element.className.trim();

        if (!className) {
            element.className = value;
        } else if (className.indexOf(value) < 0) {
            element.className = "".concat(className, " ").concat(value);
        }
    }

    /**
     * Remove classes from the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be removed.
     */

    function removeClass(element, value) {
        if (!element || !value) {
            return;
        }

        if (isNumber(element.length)) {
            forEach(element, function (elem) {
                removeClass(elem, value);
            });
            return;
        }

        if (element.classList) {
            element.classList.remove(value);
            return;
        }

        if (element.className.indexOf(value) >= 0) {
            element.className = element.className.replace(value, '');
        }
    }

    /**
     * Add or remove classes from the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be toggled.
     * @param {boolean} added - Add only.
     */

    function toggleClass(element, value, added) {
        if (!value) {
            return;
        }

        if (isNumber(element.length)) {
            forEach(element, function (elem) {
                toggleClass(elem, value, added);
            });
            return;
        } // IE10-11 doesn't support the second parameter of `classList.toggle`


        if (added) {
            addClass(element, value);
        } else {
            removeClass(element, value);
        }
    }

    var REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;

    /**
     * Transform the given string from camelCase to kebab-case
     * @param {string} value - The value to transform.
     * @returns {string} The transformed value.
     */

    function hyphenate(value) {
        return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
    }

    /**
     * Get data from the given element.
     * @param {Element} element - The target element.
     * @param {string} name - The data key to get.
     * @returns {string} The data value.
     */

    function getData(element, name) {
        if (isObject(element[name])) {
            return element[name];
        }

        if (element.dataset) {
            return element.dataset[name];
        }

        return element.getAttribute("data-".concat(hyphenate(name)));
    }

    /**
     * Set data to the given element.
     * @param {Element} element - The target element.
     * @param {string} name - The data key to set.
     * @param {string} data - The data value.
     */

    function setData(element, name, data) {
        if (isObject(data)) {
            element[name] = data;
        } else if (element.dataset) {
            element.dataset[name] = data;
        } else {
            element.setAttribute("data-".concat(hyphenate(name)), data);
        }
    }

    var onceSupported = function () {
        var supported = false;

        if (IS_BROWSER) {
            var once = false;

            var listener = function listener() {
            };

            var options = Object.defineProperty({}, 'once', {
                get: function get() {
                    supported = true;
                    return once;
                },

                /**
                 * This setter can fix a `TypeError` in strict mode
                 * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only}
                 * @param {boolean} value - The value to set
                 */
                set: function set(value) {
                    once = value;
                }
            });
            WINDOW.addEventListener('test', listener, options);
            WINDOW.removeEventListener('test', listener, options);
        }

        return supported;
    }();

    /**
     * Remove event listener from the target element.
     * @param {Element} element - The event target.
     * @param {string} type - The event type(s).
     * @param {Function} listener - The event listener.
     * @param {Object} options - The event options.
     */


    function removeListener(element, type, listener) {
        var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
        var handler = listener;
        type.trim().split(REGEXP_SPACES).forEach(function (event) {
            if (!onceSupported) {
                var listeners = element.listeners;

                if (listeners && listeners[event] && listeners[event][listener]) {
                    handler = listeners[event][listener];
                    delete listeners[event][listener];

                    if (Object.keys(listeners[event]).length === 0) {
                        delete listeners[event];
                    }

                    if (Object.keys(listeners).length === 0) {
                        delete element.listeners;
                    }
                }
            }

            element.removeEventListener(event, handler, options);
        });
    }

    /**
     * Add event listener to the target element.
     * @param {Element} element - The event target.
     * @param {string} type - The event type(s).
     * @param {Function} listener - The event listener.
     * @param {Object} options - The event options.
     */

    function addListener(element, type, listener) {
        var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
        var _handler = listener;
        type.trim().split(REGEXP_SPACES).forEach(function (event) {
            if (options.once && !onceSupported) {
                var _element$listeners = element.listeners,
                    listeners = _element$listeners === void 0 ? {} : _element$listeners;

                _handler = function handler() {
                    delete listeners[event][listener];
                    element.removeEventListener(event, _handler, options);

                    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
                        args[_key2] = arguments[_key2];
                    }

                    listener.apply(element, args);
                };

                if (!listeners[event]) {
                    listeners[event] = {};
                }

                if (listeners[event][listener]) {
                    element.removeEventListener(event, listeners[event][listener], options);
                }

                listeners[event][listener] = _handler;
                element.listeners = listeners;
            }

            element.addEventListener(event, _handler, options);
        });
    }

    /**
     * Dispatch event on the target element.
     * @param {Element} element - The event target.
     * @param {string} type - The event type(s).
     * @param {Object} data - The additional event data.
     * @param {Object} options - The additional event options.
     * @returns {boolean} Indicate if the event is default prevented or not.
     */

    function dispatchEvent(element, type, data, options) {
        var event; // Event and CustomEvent on IE9-11 are global objects, not constructors

        if (isFunction(Event) && isFunction(CustomEvent)) {
            event = new CustomEvent(type, _objectSpread2({
                bubbles: true,
                cancelable: true,
                detail: data
            }, options));
        } else {
            event = document.createEvent('CustomEvent');
            event.initCustomEvent(type, true, true, data);
        }

        return element.dispatchEvent(event);
    }

    /**
     * Get the offset base on the document.
     * @param {Element} element - The target element.
     * @returns {Object} The offset data.
     */

    function getOffset(element) {
        var box = element.getBoundingClientRect();
        return {
            left: box.left + (window.pageXOffset - document.documentElement.clientLeft),
            top: box.top + (window.pageYOffset - document.documentElement.clientTop)
        };
    }

    /**
     * Get transforms base on the given object.
     * @param {Object} obj - The target object.
     * @returns {string} A string contains transform values.
     */

    function getTransforms(_ref) {
        var rotate = _ref.rotate,
            scaleX = _ref.scaleX,
            scaleY = _ref.scaleY,
            translateX = _ref.translateX,
            translateY = _ref.translateY;
        var values = [];

        if (isNumber(translateX) && translateX !== 0) {
            values.push("translateX(".concat(translateX, "px)"));
        }

        if (isNumber(translateY) && translateY !== 0) {
            values.push("translateY(".concat(translateY, "px)"));
        } // Rotate should come first before scale to match orientation transform


        if (isNumber(rotate) && rotate !== 0) {
            values.push("rotate(".concat(rotate, "deg)"));
        }

        if (isNumber(scaleX) && scaleX !== 1) {
            values.push("scaleX(".concat(scaleX, ")"));
        }

        if (isNumber(scaleY) && scaleY !== 1) {
            values.push("scaleY(".concat(scaleY, ")"));
        }

        var transform = values.length ? values.join(' ') : 'none';
        return {
            WebkitTransform: transform,
            msTransform: transform,
            transform: transform
        };
    }

    /**
     * Get an image name from an image url.
     * @param {string} url - The target url.
     * @example
     * // picture.jpg
     * getImageNameFromURL('https://domain.com/path/to/picture.jpg?size=1280×960')
     * @returns {string} A string contains the image name.
     */

    function getImageNameFromURL(url) {
        return isString(url) ? decodeURIComponent(url.replace(/^.*\//, '').replace(/[?&#].*$/, '')) : '';
    }

    var IS_SAFARI = WINDOW.navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(WINDOW.navigator.userAgent);

    /**
     * Get an image's natural sizes.
     * @param {string} image - The target image.
     * @param {Object} options - The viewer options.
     * @param {Function} callback - The callback function.
     * @returns {HTMLImageElement} The new image.
     */

    function getImageNaturalSizes(image, options, callback) {
        var newImage = document.createElement('img'); // Modern browsers (except Safari)

        if (image.naturalWidth && !IS_SAFARI) {
            callback(image.naturalWidth, image.naturalHeight);
            return newImage;
        }

        var body = document.body || document.documentElement;

        newImage.onload = function () {
            callback(newImage.width, newImage.height);

            if (!IS_SAFARI) {
                body.removeChild(newImage);
            }
        };

        forEach(options.inheritedAttributes, function (name) {
            var value = image.getAttribute(name);

            if (value !== null) {
                newImage.setAttribute(name, value);
            }
        });
        newImage.src = image.src; // iOS Safari will convert the image automatically
        // with its orientation once append it into DOM

        if (!IS_SAFARI) {
            newImage.style.cssText = 'left:0;' + 'max-height:none!important;' + 'max-width:none!important;' + 'min-height:0!important;' + 'min-width:0!important;' + 'opacity:0;' + 'position:absolute;' + 'top:0;' + 'z-index:-1;';
            body.appendChild(newImage);
        }

        return newImage;
    }

    /**
     * Get the related class name of a responsive type number.
     * @param {string} type - The responsive type.
     * @returns {string} The related class name.
     */

    function getResponsiveClass(type) {
        switch (type) {
            case 2:
                return CLASS_HIDE_XS_DOWN;

            case 3:
                return CLASS_HIDE_SM_DOWN;

            case 4:
                return CLASS_HIDE_MD_DOWN;

            default:
                return '';
        }
    }

    /**
     * Get the max ratio of a group of pointers.
     * @param {string} pointers - The target pointers.
     * @returns {number} The result ratio.
     */

    function getMaxZoomRatio(pointers) {
        var pointers2 = _objectSpread2({}, pointers);

        var ratios = [];
        forEach(pointers, function (pointer, pointerId) {
            delete pointers2[pointerId];
            forEach(pointers2, function (pointer2) {
                var x1 = Math.abs(pointer.startX - pointer2.startX);
                var y1 = Math.abs(pointer.startY - pointer2.startY);
                var x2 = Math.abs(pointer.endX - pointer2.endX);
                var y2 = Math.abs(pointer.endY - pointer2.endY);
                var z1 = Math.sqrt(x1 * x1 + y1 * y1);
                var z2 = Math.sqrt(x2 * x2 + y2 * y2);
                var ratio = (z2 - z1) / z1;
                ratios.push(ratio);
            });
        });
        ratios.sort(function (a, b) {
            return Math.abs(a) < Math.abs(b);
        });
        return ratios[0];
    }

    /**
     * Get a pointer from an event object.
     * @param {Object} event - The target event object.
     * @param {boolean} endOnly - Indicates if only returns the end point coordinate or not.
     * @returns {Object} The result pointer contains start and/or end point coordinates.
     */

    function getPointer(_ref2, endOnly) {
        var pageX = _ref2.pageX,
            pageY = _ref2.pageY;
        var end = {
            endX: pageX,
            endY: pageY
        };
        return endOnly ? end : _objectSpread2({
            timeStamp: Date.now(),
            startX: pageX,
            startY: pageY
        }, end);
    }

    /**
     * Get the center point coordinate of a group of pointers.
     * @param {Object} pointers - The target pointers.
     * @returns {Object} The center point coordinate.
     */

    function getPointersCenter(pointers) {
        var pageX = 0;
        var pageY = 0;
        var count = 0;
        forEach(pointers, function (_ref3) {
            var startX = _ref3.startX,
                startY = _ref3.startY;
            pageX += startX;
            pageY += startY;
            count += 1;
        });
        pageX /= count;
        pageY /= count;
        return {
            pageX: pageX,
            pageY: pageY
        };
    }

    var render = {
        render: function render() {
            this.initContainer();
            this.initViewer();
            this.initList();
            this.renderViewer();
        },
        initBody: function initBody() {
            var ownerDocument = this.element.ownerDocument;
            var body = ownerDocument.body || ownerDocument.documentElement;
            this.body = body;
            this.scrollbarWidth = window.innerWidth - ownerDocument.documentElement.clientWidth;
            this.initialBodyPaddingRight = body.style.paddingRight;
            this.initialBodyComputedPaddingRight = window.getComputedStyle(body).paddingRight;
        },
        initContainer: function initContainer() {
            this.containerData = {
                width: window.innerWidth,
                height: window.innerHeight
            };
        },
        initViewer: function initViewer() {
            var options = this.options,
                parent = this.parent;
            var viewerData;

            if (options.inline) {
                viewerData = {
                    width: Math.max(parent.offsetWidth, options.minWidth),
                    height: Math.max(parent.offsetHeight, options.minHeight)
                };
                this.parentData = viewerData;
            }

            if (this.fulled || !viewerData) {
                viewerData = this.containerData;
            }

            this.viewerData = assign({}, viewerData);
        },
        renderViewer: function renderViewer() {
            if (this.options.inline && !this.fulled) {
                setStyle(this.viewer, this.viewerData);
            }
        },
        initList: function initList() {
            var _this = this;

            var element = this.element,
                options = this.options,
                list = this.list;
            var items = []; // initList may be called in this.update, so should keep idempotent

            list.innerHTML = '';
            forEach(this.images, function (image, index) {
                var src = image.src;
                var alt = image.alt || getImageNameFromURL(src);

                var url = _this.getImageURL(image);

                if (src || url) {
                    var item = document.createElement('li');
                    var img = document.createElement('img');
                    forEach(options.inheritedAttributes, function (name) {
                        var value = image.getAttribute(name);

                        if (value !== null) {
                            img.setAttribute(name, value);
                        }
                    });
                    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 width = viewerWidth;
                var height = viewerHeight;
                _this2.imageInitializing = false;

                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 left = (viewerWidth - width) / 2;
                var top = (viewerHeight - height) / 2;
                var imageData = {
                    left: left,
                    top: top,
                    x: left,
                    y: top,
                    width: width,
                    height: height,
                    oldRatio: 1,
                    ratio: width / naturalWidth,
                    aspectRatio: aspectRatio,
                    naturalWidth: naturalWidth,
                    naturalHeight: naturalHeight
                };
                var initialImageData = assign({}, imageData);

                if (options.rotatable) {
                    imageData.rotate = oldImageData.rotate || 0;
                    initialImageData.rotate = 0;
                }

                if (options.scalable) {
                    imageData.scaleX = oldImageData.scaleX || 1;
                    imageData.scaleY = oldImageData.scaleY || 1;
                    initialImageData.scaleX = 1;
                    initialImageData.scaleY = 1;
                }

                _this2.imageData = imageData;
                _this2.initialImageData = initialImageData;

                if (done) {
                    done();
                }
            });
        },
        renderImage: function renderImage(done) {
            var _this3 = this;

            var image = this.image,
                imageData = this.imageData;
            setStyle(image, assign({
                width: imageData.width,
                height: imageData.height,
                // XXX: Not to use translateX/Y to avoid image shaking when zooming
                marginLeft: imageData.x,
                marginTop: imageData.y
            }, getTransforms(imageData)));

            if (done) {
                if ((this.viewing || this.moving || this.rotating || this.scaling || this.zooming) && this.options.transition && hasClass(image, CLASS_TRANSITION)) {
                    var onTransitionEnd = function onTransitionEnd() {
                        _this3.imageRendering = false;
                        done();
                    };

                    this.imageRendering = {
                        abort: function abort() {
                            removeListener(image, EVENT_TRANSITION_END, onTransitionEnd);
                        }
                    };
                    addListener(image, EVENT_TRANSITION_END, onTransitionEnd, {
                        once: true
                    });
                } else {
                    done();
                }
            }
        },
        resetImage: function resetImage() {
            // this.image only defined after viewed
            if (this.viewing || this.viewed) {
                var image = this.image;

                if (this.viewing) {
                    this.viewing.abort();
                }

                image.parentNode.removeChild(image);
                this.image = null;
            }
        }
    };

    var events = {
        bind: function bind() {
            var options = this.options,
                viewer = this.viewer,
                canvas = this.canvas;
            var document = this.element.ownerDocument;
            addListener(viewer, EVENT_CLICK, this.onClick = this.click.bind(this));
            addListener(viewer, EVENT_DRAG_START, this.onDragStart = this.dragstart.bind(this));
            addListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown = this.pointerdown.bind(this));
            addListener(document, EVENT_POINTER_MOVE, this.onPointerMove = this.pointermove.bind(this));
            addListener(document, EVENT_POINTER_UP, this.onPointerUp = this.pointerup.bind(this));
            addListener(document, EVENT_KEY_DOWN, this.onKeyDown = this.keydown.bind(this));
            addListener(window, EVENT_RESIZE, this.onResize = this.resize.bind(this));

            if (options.zoomable && options.zoomOnWheel) {
                addListener(viewer, EVENT_WHEEL, this.onWheel = this.wheel.bind(this), {
                    passive: false,
                    capture: true
                });
            }

            if (options.toggleOnDblclick) {
                addListener(canvas, EVENT_DBLCLICK, this.onDblclick = this.dblclick.bind(this));
            }
        },
        unbind: function unbind() {
            var options = this.options,
                viewer = this.viewer,
                canvas = this.canvas;
            var document = this.element.ownerDocument;
            removeListener(viewer, EVENT_CLICK, this.onClick);
            removeListener(viewer, EVENT_DRAG_START, this.onDragStart);
            removeListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown);
            removeListener(document, EVENT_POINTER_MOVE, this.onPointerMove);
            removeListener(document, EVENT_POINTER_UP, this.onPointerUp);
            removeListener(document, EVENT_KEY_DOWN, this.onKeyDown);
            removeListener(window, EVENT_RESIZE, this.onResize);

            if (options.zoomable && options.zoomOnWheel) {
                removeListener(viewer, EVENT_WHEEL, this.onWheel, {
                    passive: false,
                    capture: true
                });
            }

            if (options.toggleOnDblclick) {
                removeListener(canvas, EVENT_DBLCLICK, this.onDblclick);
            }
        }
    };

    var handlers = {
        click: function click(event) {
            var options = this.options,
                imageData = this.imageData;
            var target = event.target;
            var action = getData(target, DATA_ACTION);

            if (!action && target.localName === 'img' && target.parentElement.localName === 'li') {
                target = target.parentElement;
                action = getData(target, DATA_ACTION);
            } // Cancel the emulated click when the native click event was triggered.


            if (IS_TOUCH_DEVICE && event.isTrusted && target === this.canvas) {
                clearTimeout(this.clickCanvasTimeout);
            }

            switch (action) {
                case 'mix':
                    if (this.played) {
                        this.stop();
                    } else if (options.inline) {
                        if (this.fulled) {
                            this.exit();
                        } else {
                            this.full();
                        }
                    } else {
                        this.hide();
                    }

                    break;

                case 'hide':
                    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);
                }

                this.toggle(event);
            }
        },
        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:
                    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:
                    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;

            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);
                        }, 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);
                        }, 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, 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, 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} [hasTooltip=false] - Indicates if it has a tooltip or not.
         * @param {Event} [_originalEvent=null] - The original event if any.
         * @returns {Viewer} 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 {Viewer} this
         */
        zoomTo: function zoomTo(ratio) {
            var _this6 = this;

            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 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 && options.zoomRatio >= 0.055 && ratio > 0.95 && ratio < 1.05) {
                    ratio = 1;
                }

                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 ? 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 {
                    // 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 (hasTooltip) {
                    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 play = function play() {
                    _this7.playing = setTimeout(function () {
                        removeClass(list[index], CLASS_IN);
                        index += 1;
                        index = index < total ? index : 0;
                        addClass(list[index], CLASS_IN);
                        play();
                    }, options.interval);
                };

                if (total > 1) {
                    play();
                }
            }

            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;
            this.played = false;
            clearTimeout(this.playing);
            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, _originalEvent);
            } else {
                this.zoomTo(1, true, _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) // Avoid conflicts with other modals (#474)
                    && (target.getAttribute('tabindex') === null || target.getAttribute('aria-modal') !== 'true')) {
                    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);
            body.style.paddingRight = "".concat(this.scrollbarWidth + (parseFloat(this.initialBodyComputedPaddingRight) || 0), "px");
        },
        close: function close() {
            var body = this.body;
            removeClass(body, CLASS_OPEN);
            body.style.paddingRight = this.initialBodyPaddingRight;
        },
        shown: function shown() {
            var element = this.element,
                options = this.options,
                viewer = this.viewer;
            this.fulled = true;
            this.isShown = true;
            this.render();
            this.bind();
            this.showing = false;

            if (options.focus) {
                viewer.focus();
                this.enforceFocus();
            }

            if (isFunction(options.shown)) {
                addListener(element, EVENT_SHOWN, options.shown, {
                    once: true
                });
            }

            if (dispatchEvent(element, EVENT_SHOWN) === false) {
                return;
            }

            if (this.ready && this.isShown && !this.hiding) {
                this.view(this.index);
            }
        },
        hidden: function hidden() {
            var element = this.element,
                options = this.options,
                viewer = this.viewer;

            if (options.fucus) {
                this.clearEnforceFocus();
            }

            this.fulled = false;
            this.viewed = false;
            this.isShown = false;
            this.close();
            this.unbind();
            addClass(viewer, CLASS_HIDE);
            viewer.removeAttribute('role');
            viewer.removeAttribute('aria-labelledby');
            viewer.removeAttribute('aria-modal');
            viewer.setAttribute('aria-hidden', true);
            this.resetList();
            this.resetImage();
            this.hiding = false;

            if (!this.destroyed) {
                if (isFunction(options.hidden)) {
                    addListener(element, EVENT_HIDDEN, options.hidden, {
                        once: true
                    });
                }

                dispatchEvent(element, EVENT_HIDDEN, null, {
                    cancelable: false
                });
            }
        },
        requestFullscreen: function requestFullscreen(options) {
            var document = this.element.ownerDocument;

            if (this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
                var documentElement = document.documentElement; // Element.requestFullscreen()

                if (documentElement.requestFullscreen) {
                    // Avoid TypeError when convert `options` to dictionary
                    if (isPlainObject(options)) {
                        documentElement.requestFullscreen(options);
                    } else {
                        documentElement.requestFullscreen();
                    }
                } else if (documentElement.webkitRequestFullscreen) {
                    documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
                } else if (documentElement.mozRequestFullScreen) {
                    documentElement.mozRequestFullScreen();
                } else if (documentElement.msRequestFullscreen) {
                    documentElement.msRequestFullscreen();
                }
            }
        },
        exitFullscreen: function exitFullscreen() {
            var document = this.element.ownerDocument;

            if (this.fulled && (document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
                // Document.exitFullscreen()
                if (document.exitFullscreen) {
                    document.exitFullscreen();
                } else if (document.webkitExitFullscreen) {
                    document.webkitExitFullscreen();
                } else if (document.mozCancelFullScreen) {
                    document.mozCancelFullScreen();
                } else if (document.msExitFullscreen) {
                    document.msExitFullscreen();
                }
            }
        },
        change: function change(event) {
            var options = this.options,
                pointers = this.pointers;
            var pointer = pointers[Object.keys(pointers)[0]]; // In the case of the `pointers` object is empty (#421)

            if (!pointer) {
                return;
            }

            var offsetX = pointer.endX - pointer.startX;
            var offsetY = pointer.endY - pointer.startY;

            switch (this.action) {
                // Move the current image
                case ACTION_MOVE:
                    this.move(offsetX, offsetY, event);
                    break;
                // Zoom the current image

                case ACTION_ZOOM:
                    this.zoom(getMaxZoomRatio(pointers), false, 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.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);
                                }
                            });
                        }
                    };
                    forEach(images, function (image) {
                        if (image.complete) {
                            progress();
                        } else {
                            addListener(image, EVENT_LOAD, 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;

}));