图片查看器——viewer.js

使用简介

https://github.com/FNNDSC/viewerjs（需要点击遮罩层关闭弹框的复制下面内容）

https://www.jianshu.com/p/d98db3815823

viewer.js

/*!
 * Viewer v1.0.0
 * https://github.com/fengyuanchen/viewer
 *
 * Copyright (c) 2015-2018 Chen Fengyuan
 * Released under the MIT license
 *
 * Date: 2018-04-01T06:11:06.751Z
 */

(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? factory(require('jquery')) :
    typeof define === 'function' && define.amd ? define(['jquery'], factory) :
    (factory(global.jQuery));
}(this, (function ($) {
    'use strict';

    $ = $ && $.hasOwnProperty('default') ? $['default'] : $;

    var DEFAULTS = {
        // Enable inline mode
        inline: false,

        // Show the button on the top-right of the viewer
        button: true,

        // Show the navbar
        //缩略图导航
        navbar: true,

        // Show the title
        title: true,

        // Show the toolbar
        //工具栏显示
        toolbar: true,

        // Show the tooltip with image ratio (percentage) when zoom in or zoom out
        tooltip: true,

        // Enable to move the image
        movable: true,

        // Enable to zoom the image
        zoomable: true,

        // Enable to rotate the image
        rotatable: true,

        // Enable to scale the image
        scalable: true,

        // Enable CSS3 Transition for some special elements
        transition: true,

        // Enable to request fullscreen when play
        fullscreen: true,

        // The amount of time to delay between automatically cycling an image when playing.
        interval: 5000,

        // Enable keyboard support
        keyboard: true,

        // Enable a modal backdrop, specify `static` for a backdrop which doesn't close the modal on click
        backdrop: true,

        // Indicate if show a loading spinner when load image or not.
        loading: true,

        // Indicate if enable loop viewing or not.
        loop: true,

        // Min width of the viewer in inline mode
        minWidth: 200,

        // Min height of the viewer in inline mode
        minHeight: 100,

        // Define the ratio when zoom the image by wheeling mouse
        zoomRatio: 0.1,

        // Define the min ratio of the image when zoom out
        minZoomRatio: 0.01,

        // Define the max ratio of the image when zoom in
        maxZoomRatio: 100,

        // Define the CSS `z-index` value of viewer in modal mode.
        zIndex: 2015,

        // Define the CSS `z-index` value of viewer in inline mode.
        zIndexInline: 0,

        // Define where to get the original image URL for viewing
        // Type: String (an image attribute) or Function (should return an image URL)
        url: 'src',

        // Define where to put the viewer in modal mode.
        // Type: String | Element
        container: 'body',

        // Filter the images for viewing.
        // Type: Function (return true if the image is viewable)
        filter: null,

        // Event shortcuts
        ready: null,
        show: null,
        shown: null,
        hide: null,
        hidden: null,
        view: null,
        viewed: null
    };

    var TEMPLATE = '<div class="viewer-container" 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"></ul>' + '</div>' + '</div>' + '<div class="viewer-tooltip"></div>' + '<div role="button" class="viewer-button" data-action="mix"></div>' + '<div class="viewer-player"></div>' + '</div>';

    var IN_BROWSER = typeof window !== 'undefined';
    var WINDOW = IN_BROWSER ? window : {};
    var NAMESPACE = 'viewer';

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

    // Classes
    var CLASS_ACTIVE = NAMESPACE + '-active';
    var CLASS_CLOSE = NAMESPACE + '-close';
    var CLASS_FADE = NAMESPACE + '-fade';
    var CLASS_FIXED = NAMESPACE + '-fixed';
    var CLASS_FULLSCREEN = NAMESPACE + '-fullscreen';
    var CLASS_FULLSCREEN_EXIT = NAMESPACE + '-fullscreen-exit';
    var CLASS_HIDE = NAMESPACE + '-hide';
    var CLASS_HIDE_MD_DOWN = NAMESPACE + '-hide-md-down';
    var CLASS_HIDE_SM_DOWN = NAMESPACE + '-hide-sm-down';
    var CLASS_HIDE_XS_DOWN = NAMESPACE + '-hide-xs-down';
    var CLASS_IN = NAMESPACE + '-in';
    var CLASS_INVISIBLE = NAMESPACE + '-invisible';
    var CLASS_LOADING = NAMESPACE + '-loading';
    var CLASS_MOVE = NAMESPACE + '-move';
    var CLASS_OPEN = NAMESPACE + '-open';
    var CLASS_SHOW = NAMESPACE + '-show';
    var CLASS_TRANSITION = NAMESPACE + '-transition';

    // Events
    var EVENT_READY = 'ready';
    var EVENT_SHOW = 'show';
    var EVENT_SHOWN = 'shown';
    var EVENT_HIDE = 'hide';
    var EVENT_HIDDEN = 'hidden';
    var EVENT_VIEW = 'view';
    var EVENT_VIEWED = 'viewed';
    var EVENT_CLICK = 'click';
    var EVENT_DRAG_START = 'dragstart';
    var EVENT_KEY_DOWN = 'keydown';
    var EVENT_LOAD = 'load';
    var EVENT_POINTER_DOWN = WINDOW.PointerEvent ? 'pointerdown' : 'touchstart mousedown';
    var EVENT_POINTER_MOVE = WINDOW.PointerEvent ? 'pointermove' : 'touchmove mousemove';
    var EVENT_POINTER_UP = WINDOW.PointerEvent ? 'pointerup pointercancel' : 'touchend touchcancel mouseup';
    var EVENT_RESIZE = 'resize';
    var EVENT_TRANSITION_END = 'transitionend';
    var EVENT_WHEEL = 'wheel mousewheel DOMMouseScroll';

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

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

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

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

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

    /**
     * Check if the given value is a string.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a string, else `false`.
     */
    function isString(value) {
        return typeof value === 'string';
    }

    /**
     * Check if the given value is not a number.
     */
    var isNaN = Number.isNaN || WINDOW.isNaN;

    /**
     * Check if the given value is a number.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a number, else `false`.
     */
    function isNumber(value) {
        return typeof value === 'number' && !isNaN(value);
    }

    /**
     * Check if the given value is undefined.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is undefined, else `false`.
     */
    function isUndefined(value) {
        return typeof value === 'undefined';
    }

    /**
     * Check if the given value is an object.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is an object, else `false`.
     */
    function isObject(value) {
        return (typeof value === 'undefined' ? 'undefined' : _typeof(value)) === 'object' && value !== null;
    }

    var hasOwnProperty = Object.prototype.hasOwnProperty;

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

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

        try {
            var _constructor = value.constructor;
            var prototype = _constructor.prototype;


            return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
        } catch (e) {
            return false;
        }
    }

    /**
     * Check if the given value is a function.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a function, else `false`.
     */
    function isFunction(value) {
        return typeof value === 'function';
    }

    /**
     * Iterate the given data.
     * @param {*} data - The data to iterate.
     * @param {Function} callback - The process function for each element.
     * @returns {*} The original data.
     */
    function forEach(data, callback) {
        if (data && isFunction(callback)) {
            if (Array.isArray(data) || isNumber(data.length) /* array-like */) {
                var length = data.length;

                var i = void 0;

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

        return data;
    }

    /**
     * Extend the given object.
     * @param {*} obj - The object to be extended.
     * @param {*} args - The rest objects which will be merged to the first object.
     * @returns {Object} The extended object.
     */
    var assign = Object.assign || function assign(obj) {
        for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
            args[_key - 1] = arguments[_key];
        }

        if (isObject(obj) && args.length > 0) {
            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;
        });
    }

    /**
     * Check if the given element has a special class.
     * @param {Element} element - The element to check.
     * @param {string} value - The class to search.
     * @returns {boolean} Returns `true` if the special class was found.
     */
    function hasClass(element, value) {
        return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1;
    }

    /**
     * Add classes to the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be added.
     */
    function addClass(element, value) {
        if (!value) {
            return;
        }

        if (isNumber(element.length)) {
            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 = className + ' ' + value;
        }
    }

    /**
     * Remove classes from the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be removed.
     */
    function removeClass(element, value) {
        if (!value) {
            return;
        }

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

        return element.getAttribute('data-' + hyphenate(name));
    }

    /**
     * Set data to the given element.
     * @param {Element} element - The target element.
     * @param {string} name - The data key to set.
     * @param {string} data - The data value.
     */
    function setData(element, name, data) {
        if (isObject(data)) {
            element[name] = data;
        } else if (element.dataset) {
            element.dataset[name] = data;
        } else {
            element.setAttribute('data-' + hyphenate(name), data);
        }
    }

    /**
     * Remove data from the given element.
     * @param {Element} element - The target element.
     * @param {string} name - The data key to remove.
     */
    function removeData(element, name) {
        if (isObject(element[name])) {
            try {
                delete element[name];
            } catch (e) {
                element[name] = undefined;
            }
        } else if (element.dataset) {
            // #128 Safari not allows to delete dataset property
            try {
                delete element.dataset[name];
            } catch (e) {
                element.dataset[name] = undefined;
            }
        } else {
            element.removeAttribute('data-' + hyphenate(name));
        }
    }

    var REGEXP_SPACES = /\s\s*/;
    var onceSupported = function () {
        var supported = false;

        if (IN_BROWSER) {
            var once = false;
            var listener = function listener() { };
            var options = Object.defineProperty({}, 'once', {
                get: function get$$1() {
                    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$$1(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 === undefined ? {} : _element$listeners;


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

                    delete listeners[event][listener];
                    element.removeEventListener(event, _handler, options);
                    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.
     * @returns {boolean} Indicate if the event is default prevented or not.
     */
    function dispatchEvent(element, type, data) {
        var event = void 0;

        // Event and CustomEvent on IE9-11 are global objects, not constructors
        if (isFunction(Event) && isFunction(CustomEvent)) {
            event = new CustomEvent(type, {
                detail: data,
                bubbles: true,
                cancelable: true
            });
        } 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(' + translateX + 'px)');
        }

        if (isNumber(translateY) && translateY !== 0) {
            values.push('translateY(' + translateY + 'px)');
        }

        // Rotate should come first before scale to match orientation transform
        if (isNumber(rotate) && rotate !== 0) {
            values.push('rotate(' + rotate + 'deg)');
        }

        if (isNumber(scaleX) && scaleX !== 1) {
            values.push('scaleX(' + scaleX + ')');
        }

        if (isNumber(scaleY) && scaleY !== 1) {
            values.push('scaleY(' + scaleY + ')');
        }

        var transform = values.length ? values.join(' ') : 'none';

        return {
            WebkitTransform: transform,
            msTransform: transform,
            transform: transform
        };
    }

    /**
     * Get an image name from an image url.
     * @param {string} url - The target url.
     * @example
     * // picture.jpg
     * getImageNameFromURL('http://domain.com/path/to/picture.jpg?size=1280×960')
     * @returns {string} A string contains the image name.
     */
    function getImageNameFromURL(url) {
        return isString(url) ? url.replace(/^.*\//, '').replace(/[?&#].*$/, '') : '';
    }

    var 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 {Function} callback - The callback function.
     * @returns {HTMLImageElement} The new image.
     */
    function getImageNaturalSizes(image, 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);
            }
        };

        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 = assign({}, 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 : assign({
            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();
        },
        initContainer: function initContainer() {
            this.containerData = {
                width: window.innerWidth,
                height: window.innerHeight
            };
        },
        initViewer: function initViewer() {
            var options = this.options,
                parent = this.parent;

            var viewerData = void 0;

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

                this.parentData = viewerData;
            }

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

            this.viewerData = 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 = [];

            forEach(this.images, function (image, i) {
                var src = image.src;

                var alt = image.alt || getImageNameFromURL(src);
                var url = options.url;


                if (isString(url)) {
                    url = image.getAttribute(url);
                } else if (isFunction(url)) {
                    url = url.call(_this, image);
                }

                if (src || url) {
                    items.push('<li>' + '<img' + (' src="' + (src || url) + '"') + ' role="button"' + ' data-action="view"' + (' data-index="' + i + '"') + (' data-original-url="' + (url || src) + '"') + (' alt="' + alt + '"') + '>' + '</li>');
                }
            });

            list.innerHTML = items.join('');
            this.items = list.getElementsByTagName('li');
            forEach(this.items, function (item) {
                var image = item.firstElementChild;

                setData(image, 'filled', true);

                if (options.loading) {
                    addClass(item, CLASS_LOADING);
                }

                addListener(image, EVENT_LOAD, function (event) {
                    if (options.loading) {
                        removeClass(item, CLASS_LOADING);
                    }

                    _this.loadImage(event);
                }, {
                    once: true
                });
            });

            if (options.transition) {
                addListener(element, EVENT_VIEWED, function () {
                    addClass(list, CLASS_TRANSITION);
                }, {
                    once: true
                });
            }
        },
        renderList: function renderList(index) {
            var i = index || this.index;
            var width = this.items[i].offsetWidth || 30;
            var outerWidth = width + 1; // 1 pixel of `margin-left` width

            // Place the active item in the center of the screen
            setStyle(this.list, assign({
                width: outerWidth * this.length
            }, getTransforms({
                translateX: (this.viewerData.width - width) / 2 - outerWidth * i
            })));
        },
        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 = void 0;

            this.imageInitializing = {
                abort: function abort() {
                    sizingImage.onload = null;
                }
            };

            sizingImage = getImageNaturalSizes(image, 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 imageData = {
                    naturalWidth: naturalWidth,
                    naturalHeight: naturalHeight,
                    aspectRatio: aspectRatio,
                    ratio: width / naturalWidth,
                    width: width,
                    height: height,
                    left: (viewerWidth - width) / 2,
                    top: (viewerHeight - height) / 2
                };
                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,
                marginLeft: imageData.left,
                marginTop: imageData.top
            }, getTransforms(imageData)));

            if (done) {
                if (this.viewing && this.options.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 element = this.element,
                viewer = this.viewer;


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


            removeListener(viewer, EVENT_CLICK, this.onClick);
            removeListener(viewer, EVENT_WHEEL, this.onWheel);
            removeListener(viewer, EVENT_DRAG_START, this.onDragStart);
            removeListener(this.canvas, EVENT_POINTER_DOWN, this.onPointerDown);
            removeListener(element.ownerDocument, EVENT_POINTER_MOVE, this.onPointerMove);
            removeListener(element.ownerDocument, EVENT_POINTER_UP, this.onPointerUp);
            removeListener(element.ownerDocument, EVENT_KEY_DOWN, this.onKeyDown);
            removeListener(window, EVENT_RESIZE, this.onResize);
        }
    };

    var handlers = {
        click: function click(_ref) {
            var target = _ref.target;
            var options = this.options,
                imageData = this.imageData;

            var action = getData(target, 'action');

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

                    break;

                case 'hide':
                    this.hide();
                    break;

                case 'view':
                    this.view(getData(target, 'index'));
                    break;

                case 'zoom-in':
                    this.zoom(0.1, true);
                    break;

                case 'zoom-out':
                    this.zoom(-0.1, true);
                    break;

                case 'one-to-one':
                    this.toggle();
                    break;

                case 'reset':
                    this.reset();
                    break;

                case 'prev':
                    this.prev(options.loop);
                    break;

                case 'play':
                    this.play(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();
                    }
            }
        },
        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:' + viewerData.width / 2 + 'px;') + ('margin-top:' + viewerData.height / 2 + 'px;') + 'max-width:none!important;' + 'position:absolute;' + '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
                    });
                });
            });
        },
        loadImage: function loadImage(e) {
            var image = e.target;
            var parent = image.parentNode;
            var parentWidth = parent.offsetWidth || 30;
            var parentHeight = parent.offsetHeight || 50;
            var filled = !!getData(image, 'filled');

            getImageNaturalSizes(image, function (naturalWidth, naturalHeight) {
                var aspectRatio = naturalWidth / naturalHeight;
                var width = parentWidth;
                var height = parentHeight;

                if (parentHeight * aspectRatio > parentWidth) {
                    if (filled) {
                        width = parentHeight * aspectRatio;
                    } else {
                        height = parentWidth / aspectRatio;
                    }
                } else if (filled) {
                    height = parentWidth / aspectRatio;
                } else {
                    width = parentHeight * aspectRatio;
                }

                setStyle(image, assign({
                    width: width,
                    height: height
                }, getTransforms({
                    translateX: (parentWidth - width) / 2,
                    translateY: (parentHeight - height) / 2
                })));
            });
        },
        keydown: function keydown(e) {
            var options = this.options;


            if (!this.fulled || !options.keyboard) {
                return;
            }

            switch (e.keyCode || e.which || e.charCode) {
                // 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
                    e.preventDefault();

                    // Zoom in
                    this.zoom(options.zoomRatio, true);
                    break;

                    // ArrowRight
                case 39:
                    this.next(options.loop);
                    break;

                    // ArrowDown
                case 40:
                    // Prevent scroll on Firefox
                    e.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 (e.ctrlKey) {
                        e.preventDefault();
                        this.toggle();
                    }

                    break;

                default:
            }
        },
        dragstart: function dragstart(e) {
            if (e.target.tagName.toLowerCase() === 'img') {
                e.preventDefault();
            }
        },
        pointerdown: function pointerdown(e) {
            var options = this.options,
                pointers = this.pointers;


            if (!this.viewed || this.showing || this.viewing || this.hiding) {
                return;
            }

            if (e.changedTouches) {
                forEach(e.changedTouches, function (touch) {
                    pointers[touch.identifier] = getPointer(touch);
                });
            } else {
                pointers[e.pointerId || 0] = getPointer(e);
            }

            var action = options.movable ? ACTION_MOVE : false;

            if (Object.keys(pointers).length > 1) {
                action = ACTION_ZOOM;
            } else if ((e.pointerType === 'touch' || e.type === 'touchstart') && this.isSwitchable()) {
                action = ACTION_SWITCH;
            }

            this.action = action;
        },
        pointermove: function pointermove(e) {
            var options = this.options,
                pointers = this.pointers,
                action = this.action,
                image = this.image;


            if (!this.viewed || !action) {
                return;
            }

            e.preventDefault();

            if (e.changedTouches) {
                forEach(e.changedTouches, function (touch) {
                    assign(pointers[touch.identifier], getPointer(touch, true));
                });
            } else {
                assign(pointers[e.pointerId || 0], getPointer(e, true));
            }

            if (action === ACTION_MOVE && options.transition && hasClass(image, CLASS_TRANSITION)) {
                removeClass(image, CLASS_TRANSITION);
            }

            this.change(e);
        },
        pointerup: function pointerup(e) {
            var action = this.action,
                pointers = this.pointers;


            if (e.changedTouches) {
                forEach(e.changedTouches, function (touch) {
                    delete pointers[touch.identifier];
                });
            } else {
                delete pointers[e.pointerId || 0];
            }

            if (!action) {
                return;
            }

            if (action === ACTION_MOVE && this.options.transition) {
                addClass(this.image, CLASS_TRANSITION);
            }

            this.action = false;
        },
        resize: function resize() {
            var _this2 = this;

            if (!this.isShown || this.hiding) {
                return;
            }

            this.initContainer();
            this.initViewer();
            this.renderViewer();
            this.renderList();

            if (this.viewed) {
                this.initImage(function () {
                    _this2.renderImage();
                });
            }

            if (this.played) {
                if (this.options.fullscreen && this.fulled && !document.fullscreenElement && !document.mozFullScreenElement && !document.webkitFullscreenElement && !document.msFullscreenElement) {
                    this.stop();
                    return;
                }

                forEach(this.player.getElementsByTagName('img'), function (image) {
                    addListener(image, EVENT_LOAD, _this2.loadImage.bind(_this2), {
                        once: true
                    });
                    dispatchEvent(image, EVENT_LOAD);
                });
            }
        },
        wheel: function wheel(e) {
            var _this3 = this;

            if (!this.viewed) {
                return;
            }

            e.preventDefault();

            // Limit wheel speed to prevent zoom too fast
            if (this.wheeling) {
                return;
            }

            this.wheeling = true;

            setTimeout(function () {
                _this3.wheeling = false;
            }, 50);

            var ratio = Number(this.options.zoomRatio) || 0.1;
            var delta = 1;

            if (e.deltaY) {
                delta = e.deltaY > 0 ? 1 : -1;
            } else if (e.wheelDelta) {
                delta = -e.wheelDelta / 120;
            } else if (e.detail) {
                delta = e.detail > 0 ? 1 : -1;
            }

            this.zoom(-delta * ratio, true, e);
        }
    };

    var methods = {
        /** Show the viewer (only available in modal mode)
         * @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);

            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
                // eslint-disable-next-line
                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 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;


            if (options.transition && !immediate) {
                var hidden = this.hidden.bind(this);
                var hide = function hide() {
                    addListener(viewer, EVENT_TRANSITION_END, hidden, {
                        once: true
                    });
                    removeClass(viewer, CLASS_IN);
                };

                this.transitioning = {
                    abort: function abort() {
                        if (this.viewed) {
                            removeListener(this.image, EVENT_TRANSITION_END, hide);
                        } else {
                            removeListener(viewer, EVENT_TRANSITION_END, hidden);
                        }
                    }
                };

                if (this.viewed) {
                    addListener(this.image, EVENT_TRANSITION_END, hide, {
                        once: true
                    });
                    this.zoomTo(0, false, false, true);
                } else {
                    hide();
                }
            } else {
                removeClass(viewer, CLASS_IN);
                this.hidden();
            }

            return this;
        },


        /**
         * View one of the images with image's index
         * @param {number} index - The index of the image to view.
         * @returns {Viewer} this
         */
        view: function view() {
            var _this = this;

            var index = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;

            index = Number(index) || 0;

            if (!this.isShown) {
                this.index = index;
                return this.show();
            }

            if (this.hiding || this.played || index < 0 || index >= this.length || this.viewed && index === this.index) {
                return this;
            }

            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');

            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;
            }

            this.image = image;
            removeClass(this.items[this.index], CLASS_ACTIVE);
            addClass(item, CLASS_ACTIVE);
            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 = _this.imageData;


                title.textContent = alt + ' (' + imageData.naturalWidth + ' \xD7 ' + imageData.naturalHeight + ')';
            };
            var onLoad = void 0;

            addListener(element, EVENT_VIEWED, onViewed, {
                once: true
            });

            this.viewing = {
                abort: function abort() {
                    removeListener(element, EVENT_VIEWED, onViewed);

                    if (image.complete) {
                        if (this.imageRendering) {
                            this.imageRendering.abort();
                        } else if (this.imageInitializing) {
                            this.imageInitializing.abort();
                        }
                    } else {
                        removeListener(image, EVENT_LOAD, onLoad);

                        if (this.timeout) {
                            clearTimeout(this.timeout);
                        }
                    }
                }
            };

            if (image.complete) {
                this.load();
            } else {
                addListener(image, EVENT_LOAD, onLoad = this.load.bind(this), {
                    once: true
                });

                if (this.timeout) {
                    clearTimeout(this.timeout);
                }

                // Make the image visible if it fails to load within 1s
                this.timeout = setTimeout(function () {
                    removeClass(image, CLASS_INVISIBLE);
                    _this.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} offsetX - The relative offset distance on the x-axis.
         * @param {number} offsetY - The relative offset distance on the y-axis.
         * @returns {Viewer} this
         */
        move: function move(offsetX, offsetY) {
            var imageData = this.imageData;


            this.moveTo(isUndefined(offsetX) ? offsetX : imageData.left + Number(offsetX), isUndefined(offsetY) ? offsetY : imageData.top + Number(offsetY));

            return this;
        },


        /**
         * Move the image to an absolute point.
         * @param {number} x - The x-axis coordinate.
         * @param {number} [y=x] - The y-axis coordinate.
         * @returns {Viewer} this
         */
        moveTo: function moveTo(x) {
            var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
            var imageData = this.imageData;


            x = Number(x);
            y = Number(y);

            if (this.viewed && !this.played && this.options.movable) {
                var changed = false;

                if (isNumber(x)) {
                    imageData.left = x;
                    changed = true;
                }

                if (isNumber(y)) {
                    imageData.top = y;
                    changed = true;
                }

                if (changed) {
                    this.renderImage();
                }
            }

            return this;
        },


        /**
         * Zoom the image with a relative ratio.
         * @param {number} ratio - The target ratio.
         * @param {boolean} [hasTooltip=false] - Indicates if it has a tooltip or not.
         * @param {Event} [_originalEvent=null] - The original event if any.
         * @returns {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 hasTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

            var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

            var _zoomable = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;

            var options = this.options,
                pointers = this.pointers,
                imageData = this.imageData;


            ratio = Math.max(0, ratio);

            if (isNumber(ratio) && this.viewed && !this.played && (_zoomable || options.zoomable)) {
                if (!_zoomable) {
                    var minZoomRatio = Math.max(0.01, options.minZoomRatio);
                    var maxZoomRatio = Math.min(100, options.maxZoomRatio);

                    ratio = Math.min(Math.max(ratio, minZoomRatio), maxZoomRatio);
                }

                if (_originalEvent && ratio > 0.95 && ratio < 1.05) {
                    ratio = 1;
                }

                var newWidth = imageData.naturalWidth * ratio;
                var newHeight = imageData.naturalHeight * ratio;

                if (_originalEvent) {
                    var offset = getOffset(this.viewer);
                    var center = pointers && Object.keys(pointers).length ? getPointersCenter(pointers) : {
                        pageX: _originalEvent.pageX,
                        pageY: _originalEvent.pageY
                    };

                    // Zoom from the triggering point of the event
                    imageData.left -= (newWidth - imageData.width) * ((center.pageX - offset.left - imageData.left) / imageData.width);
                    imageData.top -= (newHeight - imageData.height) * ((center.pageY - offset.top - imageData.top) / imageData.height);
                } else {
                    // Zoom from the center of the image
                    imageData.left -= (newWidth - imageData.width) / 2;
                    imageData.top -= (newHeight - imageData.height) / 2;
                }

                imageData.width = newWidth;
                imageData.height = newHeight;
                imageData.ratio = ratio;
                this.renderImage();

                if (hasTooltip) {
                    this.tooltip();
                }
            }

            return this;
        },


        /**
         * Rotate the image with a relative degree.
         * @param {number} degree - The rotate degree.
         * @returns {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 imageData = this.imageData;


            degree = Number(degree);

            if (isNumber(degree) && this.viewed && !this.played && this.options.rotatable) {
                imageData.rotate = degree;
                this.renderImage();
            }

            return this;
        },


        /**
         * Scale the image on the x-axis.
         * @param {number} scaleX - The scale ratio on the x-axis.
         * @returns {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 scaleY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : scaleX;
            var imageData = this.imageData;


            scaleX = Number(scaleX);
            scaleY = Number(scaleY);

            if (this.viewed && !this.played && this.options.scalable) {
                var changed = false;

                if (isNumber(scaleX)) {
                    imageData.scaleX = scaleX;
                    changed = true;
                }

                if (isNumber(scaleY)) {
                    imageData.scaleY = scaleY;
                    changed = true;
                }

                if (changed) {
                    this.renderImage();
                }
            }

            return this;
        },


        /**
         * Play the images
         * @param {boolean} [fullscreen=false] - Indicate if request fullscreen or not.
         * @returns {Viewer} this
         */
        play: function play() {
            var _this2 = this;

            var fullscreen = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;

            if (!this.isShown || this.played) {
                return this;
            }

            var options = this.options,
                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();
            }

            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');
                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() {
                    _this2.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 _this3 = this;

            if (!this.played) {
                return this;
            }

            var player = this.player;


            this.played = false;
            clearTimeout(this.playing);
            forEach(player.getElementsByTagName('img'), function (image) {
                removeListener(image, EVENT_LOAD, _this3.onLoadWhenPlay);
            });
            removeClass(player, CLASS_SHOW);
            player.innerHTML = '';
            this.exitFullscreen();

            return this;
        },


        // Enter modal mode (only available in inline mode)
        full: function full() {
            var _this4 = 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('style', '');
            setStyle(viewer, {
                zIndex: options.zIndex
            });

            this.initContainer();
            this.viewerData = assign({}, this.containerData);
            this.renderList();

            if (this.viewed) {
                this.initImage(function () {
                    _this4.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 _this5 = 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);
                }
            }

            removeClass(viewer, CLASS_FIXED);
            setStyle(viewer, {
                zIndex: options.zIndexInline
            });

            this.viewerData = assign({}, this.parentData);
            this.renderViewer();
            this.renderList();

            if (this.viewed) {
                this.initImage(function () {
                    _this5.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 _this6 = this;

            var options = this.options,
                tooltipBox = this.tooltipBox,
                imageData = this.imageData;


            if (!this.viewed || this.played || !options.tooltip) {
                return this;
            }

            tooltipBox.textContent = Math.round(imageData.ratio * 100) + '%';

            if (!this.tooltipping) {
                if (options.transition) {
                    if (this.fading) {
                        dispatchEvent(tooltipBox, EVENT_TRANSITION_END);
                    }

                    addClass(tooltipBox, CLASS_SHOW);
                    addClass(tooltipBox, CLASS_FADE);
                    addClass(tooltipBox, CLASS_TRANSITION);

                    // Force reflow to enable CSS3 transition
                    // eslint-disable-next-line
                    tooltipBox.offsetWidth;
                    addClass(tooltipBox, CLASS_IN);
                } else {
                    addClass(tooltipBox, CLASS_SHOW);
                }
            } else {
                clearTimeout(this.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);
                        _this6.fading = false;
                    }, {
                        once: true
                    });

                    removeClass(tooltipBox, CLASS_IN);
                    _this6.fading = true;
                } else {
                    removeClass(tooltipBox, CLASS_SHOW);
                }

                _this6.tooltipping = false;
            }, 1000);

            return this;
        },


        // Toggle the image size between its natural size and initial size
        toggle: function toggle() {
            if (this.imageData.ratio === 1) {
                this.zoomTo(this.initialImageData.ratio, true);
            } else {
                this.zoomTo(1, true);
            }

            return this;
        },


        // Reset the image to its initial state
        reset: function reset() {
            if (this.viewed && !this.played) {
                this.imageData = assign({}, this.initialImageData);
                this.renderImage();
            }

            return this;
        },


        // Update viewer when images changed
        update: function update() {
            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 (options.filter) {
                    if (options.filter(image)) {
                        images.push(image);
                    }
                } else {
                    images.push(image);
                }
            });

            if (!images.length) {
                return this;
            }

            this.images = images;
            this.length = images.length;

            if (this.ready) {
                var indexes = [];

                forEach(this.items, function (item, i) {
                    var img = item.querySelector('img');
                    var image = images[i];

                    if (image) {
                        if (image.src !== img.src) {
                            indexes.push(i);
                        }
                    } else {
                        indexes.push(i);
                    }
                });

                setStyle(this.list, {
                    width: 'auto'
                });

                this.initList();

                if (this.isShown) {
                    if (this.length) {
                        if (this.viewed) {
                            var index = indexes.indexOf(this.index);

                            if (index >= 0) {
                                this.viewed = false;
                                this.view(Math.max(this.index - (index + 1), 0));
                            } else {
                                addClass(this.items[this.index], CLASS_ACTIVE);
                            }
                        }
                    } else {
                        this.image = null;
                        this.viewed = false;
                        this.index = 0;
                        this.imageData = null;
                        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 (!getData(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);
            }

            removeData(element, NAMESPACE);
            return this;
        }
    };

    var others = {
        open: function open() {
            var body = this.body;


            addClass(body, CLASS_OPEN);

            body.style.paddingRight = this.scrollbarWidth + (parseFloat(this.initialBodyPaddingRight) || 0) + 'px';
        },
        close: function close() {
            var body = this.body;


            removeClass(body, CLASS_OPEN);
            body.style.paddingRight = this.initialBodyPaddingRight;
        },
        shown: function shown() {
            var element = this.element,
                options = this.options;


            this.fulled = true;
            this.isShown = true;
            this.render();
            this.bind();
            this.showing = false;

            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;


            this.fulled = false;
            this.viewed = false;
            this.isShown = false;
            this.close();
            this.unbind();
            addClass(this.viewer, CLASS_HIDE);
            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);
            }
        },
        requestFullscreen: function requestFullscreen() {
            var document = this.element.ownerDocument;

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


                if (documentElement.requestFullscreen) {
                    documentElement.requestFullscreen();
                } else if (documentElement.msRequestFullscreen) {
                    documentElement.msRequestFullscreen();
                } else if (documentElement.mozRequestFullScreen) {
                    documentElement.mozRequestFullScreen();
                } else if (documentElement.webkitRequestFullscreen) {
                    documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
                }
            }
        },
        exitFullscreen: function exitFullscreen() {
            if (this.fulled) {
                var document = this.element.ownerDocument;

                if (document.exitFullscreen) {
                    document.exitFullscreen();
                } else if (document.msExitFullscreen) {
                    document.msExitFullscreen();
                } else if (document.mozCancelFullScreen) {
                    document.mozCancelFullScreen();
                } else if (document.webkitExitFullscreen) {
                    document.webkitExitFullscreen();
                }
            }
        },
        change: function change(e) {
            var options = this.options,
                pointers = this.pointers;

            var pointer = pointers[Object.keys(pointers)[0]];
            var offsetX = pointer.endX - pointer.startX;
            var offsetY = pointer.endY - pointer.startY;

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

                    // Zoom the current image
                case ACTION_ZOOM:
                    this.zoom(getMaxZoomRatio(pointers), false, e);
                    break;

                case ACTION_SWITCH:
                    this.action = 'switched';

                    // Empty `pointers` as `touchend` event will not be fired after swiped in iOS browsers.
                    this.pointers = {};

                    if (Math.abs(offsetX) > Math.abs(offsetY)) {
                        if (offsetX > 1) {
                            this.prev(options.loop);
                        } else if (offsetX < -1) {
                            this.next(options.loop);
                        }
                    }

                    break;

                default:
            }

            // Override
            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.left >= 0 && imageData.top >= 0 && imageData.width <= viewerData.width && imageData.height <= viewerData.height;
        }
    };

    var AnotherViewer = WINDOW.Viewer;

    var Viewer = function () {
        /**
         * Create a new Viewer.
         * @param {Element} element - The target element for viewing.
         * @param {Object} [options={}] - The configuration options.
         */
        function Viewer(element) {
            var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
            classCallCheck(this, Viewer);

            if (!element || element.nodeType !== 1) {
                throw new Error('The first argument is required and must be an element.');
            }

            this.element = element;
            this.options = assign({}, DEFAULTS, isPlainObject(options) && options);
            this.action = false;
            this.fading = false;
            this.fulled = false;
            this.hiding = false;
            this.index = 0;
            this.isImg = false;
            this.length = 0;
            this.played = false;
            this.playing = false;
            this.pointers = {};
            this.ready = false;
            this.showing = false;
            this.timeout = false;
            this.tooltipping = false;
            this.viewed = false;
            this.viewing = false;
            this.isShown = false;
            this.wheeling = false;
            this.init();
        }

        createClass(Viewer, [{
            key: 'init',
            value: function init() {
                var _this = this;

                var element = this.element,
                    options = this.options;


                if (getData(element, NAMESPACE)) {
                    return;
                }

                setData(element, NAMESPACE, this);

                var isImg = element.tagName.toLowerCase() === 'img';
                var images = [];

                forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
                    if (isFunction(options.filter)) {
                        if (options.filter.call(_this, image)) {
                            images.push(image);
                        }
                    } else {
                        images.push(image);
                    }
                });

                if (!images.length) {
                    return;
                }

                this.isImg = isImg;
                this.length = images.length;
                this.images = images;

                var ownerDocument = element.ownerDocument;

                var body = ownerDocument.body || ownerDocument.documentElement;

                this.body = body;
                this.scrollbarWidth = window.innerWidth - ownerDocument.documentElement.clientWidth;
                this.initialBodyPaddingRight = window.getComputedStyle(body).paddingRight;

                // 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 = void 0;

                            _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.tagName.toLowerCase() === 'img') {
                            _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('.' + NAMESPACE + '-container');
                var title = viewer.querySelector('.' + NAMESPACE + '-title');
                var toolbar = viewer.querySelector('.' + NAMESPACE + '-toolbar');
                var navbar = viewer.querySelector('.' + NAMESPACE + '-navbar');
                var button = viewer.querySelector('.' + NAMESPACE + '-button');
                var canvas = viewer.querySelector('.' + NAMESPACE + '-canvas');

                this.parent = parent;
                this.viewer = viewer;
                this.title = title;
                this.toolbar = toolbar;
                this.navbar = navbar;
                this.button = button;
                this.canvas = canvas;
                this.footer = viewer.querySelector('.' + NAMESPACE + '-footer');
                this.tooltipBox = viewer.querySelector('.' + NAMESPACE + '-tooltip');
                this.player = viewer.querySelector('.' + NAMESPACE + '-player');
                this.list = viewer.querySelector('.' + NAMESPACE + '-list');

                addClass(title, !options.title ? CLASS_HIDE : getResponsiveClass(options.title));
                addClass(navbar, !options.navbar ? CLASS_HIDE : getResponsiveClass(options.navbar));
                toggleClass(button, CLASS_HIDE, !options.button);

                if (options.backdrop) {
                    addClass(viewer, NAMESPACE + '-backdrop');

                    if (!options.inline && options.backdrop === true) {
                        setData(canvas, 'action', 'hide');
                    }
                }

                if (options.toolbar) {
                    var list = document.createElement('ul');
                    var custom = isPlainObject(options.toolbar);
                    var zoomButtons = BUTTONS.slice(0, 3);
                    var rotateButtons = BUTTONS.slice(7, 9);
                    var scaleButtons = BUTTONS.slice(9);

                    if (!custom) {
                        addClass(toolbar, getResponsiveClass(options.toolbar));
                    }

                    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');

                        item.setAttribute('role', 'button');
                        addClass(item, NAMESPACE + '-' + name);

                        if (!isFunction(click)) {
                            setData(item, 'action', name);
                        }

                        if (isNumber(show)) {
                            addClass(item, getResponsiveClass(show));
                        }

                        if (['small', 'large'].indexOf(size) !== -1) {
                            addClass(item, NAMESPACE + '-' + size);
                        } else if (name === 'play') {
                            addClass(item, NAMESPACE + '-large');
                        }

                        if (isFunction(click)) {
                            addListener(item, EVENT_CLICK, click);
                        }

                        list.appendChild(item);
                    });

                    toolbar.appendChild(list);
                } else {
                    addClass(toolbar, CLASS_HIDE);
                }

                if (!options.rotatable) {
                    var rotates = toolbar.querySelectorAll('li[class*="rotate"]');

                    addClass(rotates, CLASS_INVISIBLE);
                    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();
                }
            }

            /**
             * 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);

    if ($.fn) {
        var AnotherViewer$1 = $.fn.viewer;
        var NAMESPACE$1 = 'viewer';

        $.fn.viewer = function jQueryViewer(option) {
            for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
                args[_key - 1] = arguments[_key];
            }

            var result = void 0;

            this.each(function (i, element) {
                var $element = $(element);
                var isDestroy = option === 'destroy';
                var viewer = $element.data(NAMESPACE$1);

                if (!viewer) {
                    if (isDestroy) {
                        return;
                    }

                    var options = $.extend({}, $element.data(), $.isPlainObject(option) && option);

                    viewer = new Viewer(element, options);
                    $element.data(NAMESPACE$1, viewer);
                }

                if (typeof option === 'string') {
                    var fn = viewer[option];

                    if ($.isFunction(fn)) {
                        result = fn.apply(viewer, args);

                        if (result === viewer) {
                            result = undefined;
                        }

                        if (isDestroy) {
                            $element.removeData(NAMESPACE$1);
                        }
                    }
                }
            });

            return result !== undefined ? result : this;
        };

        $.fn.viewer.Constructor = Viewer;
        $.fn.viewer.setDefaults = Viewer.setDefaults;
        $.fn.viewer.noConflict = function noConflict() {
            $.fn.viewer = AnotherViewer$1;
            return this;
        };
    }

})));

 

view.css

/*!
 * Viewer v1.0.0
 * https://github.com/fengyuanchen/viewer
 *
 * Copyright (c) 2015-2018 Chen Fengyuan
 * Released under the MIT license
 *
 * Date: 2018-04-01T06:09:55.194Z
 */

.viewer-zoom-in::before,
.viewer-zoom-out::before,
.viewer-one-to-one::before,
.viewer-reset::before,
.viewer-prev::before,
.viewer-play::before,
.viewer-next::before,
.viewer-rotate-left::before,
.viewer-rotate-right::before,
.viewer-flip-horizontal::before,
.viewer-flip-vertical::before,
.viewer-fullscreen::before,
.viewer-fullscreen-exit::before,
.viewer-close::before {
  background-image: url('data:image/png;base64,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');
  background-repeat: no-repeat;
  color: transparent;
  display: block;
  font-size: 0;
  height: 20px;
  line-height: 0;
  width: 20px;
}

.viewer-zoom-in::before {
  background-position: 0 0;
  content: 'Zoom In';
}

.viewer-zoom-out::before {
  background-position: -20px 0;
  content: 'Zoom Out';
}

.viewer-one-to-one::before {
  background-position: -40px 0;
  content: 'One to One';
}

.viewer-reset::before {
  background-position: -60px 0;
  content: 'Reset';
}

.viewer-prev::before {
  background-position: -80px 0;
  content: 'Previous';
}

.viewer-play::before {
  background-position: -100px 0;
  content: 'Play';
}

.viewer-next::before {
  background-position: -120px 0;
  content: 'Next';
}

.viewer-rotate-left::before {
  background-position: -140px 0;
  content: 'Rotate Left';
}

.viewer-rotate-right::before {
  background-position: -160px 0;
  content: 'Rotate Right';
}

.viewer-flip-horizontal::before {
  background-position: -180px 0;
  content: 'Flip Horizontal';
}

.viewer-flip-vertical::before {
  background-position: -200px 0;
  content: 'Flip Vertical';
}

.viewer-fullscreen::before {
  background-position: -220px 0;
  content: 'Enter Full Screen';
}

.viewer-fullscreen-exit::before {
  background-position: -240px 0;
  content: 'Exit Full Screen';
}

.viewer-close::before {
  background-position: -260px 0;
  content: 'Close';
}

.viewer-container {
  bottom: 0;
  direction: ltr;
  font-size: 0;
  left: 0;
  line-height: 0;
  overflow: hidden;
  position: absolute;
  right: 0;
  -webkit-tap-highlight-color: transparent;
  top: 0;
  -webkit-touch-callout: none;
  -ms-touch-action: none;
  touch-action: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.viewer-container::-moz-selection,
.viewer-container *::-moz-selection {
  background-color: transparent;
}

.viewer-container::selection,
.viewer-container *::selection {
  background-color: transparent;
}

.viewer-container img {
  display: block;
  height: auto;
  max-height: none !important;
  max-width: none !important;
  min-height: 0 !important;
  min-width: 0 !important;
  width: 100%;
}

.viewer-canvas {
  bottom: 0;
  left: 0;
  overflow: hidden;
  position: absolute;
  right: 0;
  top: 0;
}

.viewer-canvas > img {
  height: auto;
  margin: 15px auto;
  max-width: 90% !important;
  width: auto;
}

.viewer-footer {
  bottom: 0;
  left: 0;
  overflow: hidden;
  position: absolute;
  right: 0;
  text-align: center;
}

.viewer-navbar {
  background-color: rgba(0, 0, 0, .5);
  overflow: hidden;
}

.viewer-list {
  -webkit-box-sizing: content-box;
  box-sizing: content-box;
  height: 50px;
  margin: 0;
  overflow: hidden;
  padding: 1px 0;
}

.viewer-list > li {
  color: transparent;
  cursor: pointer;
  float: left;
  font-size: 0;
  height: 50px;
  line-height: 0;
  opacity: .5;
  overflow: hidden;
  -webkit-transition: opacity .15s;
  transition: opacity .15s;
  width: 30px;
}

.viewer-list > li:hover {
  opacity: .75;
}

.viewer-list > li + li {
  margin-left: 1px;
}

.viewer-list > .viewer-loading {
  position: relative;
}

.viewer-list > .viewer-loading::after {
  border-width: 2px;
  height: 20px;
  margin-left: -10px;
  margin-top: -10px;
  width: 20px;
}

.viewer-list > .viewer-active,
.viewer-list > .viewer-active:hover {
  opacity: 1;
}

.viewer-player {
  background-color: #000;
  bottom: 0;
  cursor: none;
  display: none;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
}

.viewer-player > img {
  left: 0;
  position: absolute;
  top: 0;
}

.viewer-toolbar ul {
  display: inline-block;
  margin: 0 auto 5px;
  overflow: hidden;
  padding: 3px 0;
}

.viewer-toolbar li {
  background-color: rgba(0, 0, 0, .5);
  border-radius: 50%;
  cursor: pointer;
  float: left;
  height: 24px;
  overflow: hidden;
  -webkit-transition: background-color .15s;
  transition: background-color .15s;
  width: 24px;
}

.viewer-toolbar li:hover {
  background-color: rgba(0, 0, 0, .8);
}

.viewer-toolbar li::before {
  margin: 2px;
}

.viewer-toolbar li + li {
  margin-left: 1px;
}

.viewer-toolbar .viewer-small {
  height: 18px;
  margin-bottom: 3px;
  margin-top: 3px;
  width: 18px;
}

.viewer-toolbar .viewer-small::before {
  margin: -1px;
}

.viewer-toolbar .viewer-large {
  height: 30px;
  margin-bottom: -3px;
  margin-top: -3px;
  width: 30px;
}

.viewer-toolbar .viewer-large::before {
  margin: 5px;
}

.viewer-tooltip {
  background-color: rgba(0, 0, 0, .8);
  border-radius: 10px;
  color: #fff;
  display: none;
  font-size: 12px;
  height: 20px;
  left: 50%;
  line-height: 20px;
  margin-left: -25px;
  margin-top: -10px;
  position: absolute;
  text-align: center;
  top: 50%;
  width: 50px;
}

.viewer-title {
  color: #ccc;
  display: inline-block;
  font-size: 12px;
  line-height: 1;
  margin: 0 5% 5px;
  max-width: 90%;
  opacity: .8;
  overflow: hidden;
  text-overflow: ellipsis;
  -webkit-transition: opacity .15s;
  transition: opacity .15s;
  white-space: nowrap;
}

.viewer-title:hover {
  opacity: 1;
}

.viewer-button {
  background-color: rgba(0, 0, 0, .5);
  border-radius: 50%;
  cursor: pointer;
  height: 80px;
  overflow: hidden;
  position: absolute;
  right: -40px;
  top: -40px;
  -webkit-transition: background-color .15s;
  transition: background-color .15s;
  width: 80px;
}

.viewer-button:focus,
.viewer-button:hover {
  background-color: rgba(0, 0, 0, .8);
}

.viewer-button::before {
  bottom: 15px;
  left: 15px;
  position: absolute;
}

.viewer-fixed {
  position: fixed;
}

.viewer-open {
  overflow: hidden;
}

.viewer-show {
  display: block;
}

.viewer-hide {
  display: none;
}

.viewer-backdrop {
  background-color: rgba(0, 0, 0, .5);
}

.viewer-invisible {
  visibility: hidden;
}

.viewer-move {
  cursor: move;
  cursor: -webkit-grab;
  cursor: grab;
}

.viewer-fade {
  opacity: 0;
}

.viewer-in {
  opacity: 1;
}

.viewer-transition {
  -webkit-transition: all .3s;
  transition: all .3s;
}

@-webkit-keyframes viewer-spinner {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }

  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

@keyframes viewer-spinner {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }

  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

.viewer-loading::after {
  -webkit-animation: viewer-spinner 1s linear infinite;
  animation: viewer-spinner 1s linear infinite;
  border: 4px solid rgba(255, 255, 255, .1);
  border-left-color: rgba(255, 255, 255, .5);
  border-radius: 50%;
  content: '';
  display: inline-block;
  height: 40px;
  left: 50%;
  margin-left: -20px;
  margin-top: -20px;
  position: absolute;
  top: 50%;
  width: 40px;
  z-index: 1;
}

@media (max-width: 767px) {
  .viewer-hide-xs-down {
    display: none;
  }
}

@media (max-width: 991px) {
  .viewer-hide-sm-down {
    display: none;
  }
}

@media (max-width: 1199px) {
  .viewer-hide-md-down {
    display: none;
  }
}