unboundedpress/public/lightgallery/js/lightgallery.js

(function() {
    'use strict';

    var defaults = {

        mode: 'lg-slide',

        // Ex : 'ease'
        cssEasing: 'ease',

        //'for jquery animation'
        easing: 'linear',
        speed: 600,
        height: '100%',
        width: '100%',
        addClass: '',
        startClass: 'lg-start-zoom',
        backdropDuration: 150,
        hideBarsDelay: 6000,

        useLeft: false,

        closable: true,
        loop: true,
        escKey: true,
        keyPress: true,
        controls: true,
        slideEndAnimatoin: true,
        hideControlOnEnd: false,
        mousewheel: true,

        getCaptionFromTitleOrAlt: true,

        // .lg-item || '.lg-sub-html'
        appendSubHtmlTo: '.lg-sub-html',

        subHtmlSelectorRelative: false,

        /**
         * @desc number of preload slides
         * will exicute only after the current slide is fully loaded.
         *
         * @ex you clicked on 4th image and if preload = 1 then 3rd slide and 5th
         * slide will be loaded in the background after the 4th slide is fully loaded..
         * if preload is 2 then 2nd 3rd 5th 6th slides will be preloaded.. ... ...
         *
         */
        preload: 1,
        showAfterLoad: true,
        selector: '',
        selectWithin: '',
        nextHtml: '',
        prevHtml: '',

        // 0, 1
        index: false,

        iframeMaxWidth: '100%',

        download: true,
        counter: true,
        appendCounterTo: '.lg-toolbar',

        swipeThreshold: 50,
        enableSwipe: true,
        enableDrag: true,

        dynamic: false,
        dynamicEl: [],
        galleryId: 1
    };

    function Plugin(element, options) {

        // Current lightGallery element
        this.el = element;

        // Current jquery element
        this.$el = $(element);

        // lightGallery settings
        this.s = $.extend({}, defaults, options);

        // When using dynamic mode, ensure dynamicEl is an array
        if (this.s.dynamic && this.s.dynamicEl !== 'undefined' && this.s.dynamicEl.constructor === Array && !this.s.dynamicEl.length) {
            throw ('When using dynamic mode, you must also define dynamicEl as an Array.');
        }

        // lightGallery modules
        this.modules = {};

        // false when lightgallery complete first slide;
        this.lGalleryOn = false;

        this.lgBusy = false;

        // Timeout function for hiding controls;
        this.hideBartimeout = false;

        // To determine browser supports for touch events;
        this.isTouch = ('ontouchstart' in document.documentElement);

        // Disable hideControlOnEnd if sildeEndAnimation is true
        if (this.s.slideEndAnimatoin) {
            this.s.hideControlOnEnd = false;
        }

        // Gallery items
        if (this.s.dynamic) {
            this.$items = this.s.dynamicEl;
        } else {
            if (this.s.selector === 'this') {
                this.$items = this.$el;
            } else if (this.s.selector !== '') {
                if (this.s.selectWithin) {
                    this.$items = $(this.s.selectWithin).find(this.s.selector);
                } else {
                    this.$items = this.$el.find($(this.s.selector));
                }
            } else {
                this.$items = this.$el.children();
            }
        }

        // .lg-item
        this.$slide = '';

        // .lg-outer
        this.$outer = '';

        this.init();

        return this;
    }

    Plugin.prototype.init = function() {

        var _this = this;

        // s.preload should not be more than $item.length
        if (_this.s.preload > _this.$items.length) {
            _this.s.preload = _this.$items.length;
        }

        // if dynamic option is enabled execute immediately
        var _hash = window.location.hash;
        if (_hash.indexOf('lg=' + this.s.galleryId) > 0) {

            _this.index = parseInt(_hash.split('&slide=')[1], 10);

            $('body').addClass('lg-from-hash');
            if (!$('body').hasClass('lg-on')) {
                setTimeout(function() {
                    _this.build(_this.index);
                });

                $('body').addClass('lg-on');
            }
        }

        if (_this.s.dynamic) {

            _this.$el.trigger('onBeforeOpen.lg');

            _this.index = _this.s.index || 0;

            // prevent accidental double execution
            if (!$('body').hasClass('lg-on')) {
                setTimeout(function() {
                    _this.build(_this.index);
                    $('body').addClass('lg-on');
                });
            }
        } else {

            // Using different namespace for click because click event should not unbind if selector is same object('this')
            _this.$items.on('click.lgcustom', function(event) {

                // For IE8
                try {
                    event.preventDefault();
                    event.preventDefault();
                } catch (er) {
                    event.returnValue = false;
                }

                _this.$el.trigger('onBeforeOpen.lg');

                _this.index = _this.s.index || _this.$items.index(this);

                // prevent accidental double execution
                if (!$('body').hasClass('lg-on')) {
                    _this.build(_this.index);
                    $('body').addClass('lg-on');
                }
            });
        }

    };

    Plugin.prototype.build = function(index) {

        var _this = this;

        _this.structure();

        // module constructor
        $.each($.fn.lightGallery.modules, function(key) {
            _this.modules[key] = new $.fn.lightGallery.modules[key](_this.el);
        });

        // initiate slide function
        _this.slide(index, false, false, false);

        if (_this.s.keyPress) {
            _this.keyPress();
        }

        if (_this.$items.length > 1) {

            _this.arrow();

            setTimeout(function() {
                _this.enableDrag();
                _this.enableSwipe();
            }, 50);

            if (_this.s.mousewheel) {
                _this.mousewheel();
            }
        } else {
            _this.$slide.on('click.lg', function() {
                _this.$el.trigger('onSlideClick.lg');
            });
        }

        _this.counter();

        _this.closeGallery();

        _this.$el.trigger('onAfterOpen.lg');

        // Hide controllers if mouse doesn't move for some period
        _this.$outer.on('mousemove.lg click.lg touchstart.lg', function() {

            _this.$outer.removeClass('lg-hide-items');

            clearTimeout(_this.hideBartimeout);

            // Timeout will be cleared on each slide movement also
            _this.hideBartimeout = setTimeout(function() {
                _this.$outer.addClass('lg-hide-items');
            }, _this.s.hideBarsDelay);

        });

        _this.$outer.trigger('mousemove.lg');

    };

    Plugin.prototype.structure = function() {
        var list = '';
        var controls = '';
        var i = 0;
        var subHtmlCont = '';
        var template;
        var _this = this;

        $('body').append('<div class="lg-backdrop"></div>');
        $('.lg-backdrop').css('transition-duration', this.s.backdropDuration + 'ms');

        // Create gallery items
        for (i = 0; i < this.$items.length; i++) {
            list += '<div class="lg-item"></div>';
        }

        // Create controlls
        if (this.s.controls && this.$items.length > 1) {
            controls = '<div class="lg-actions">' +
                '<button class="lg-prev lg-icon">' + this.s.prevHtml + '</button>' +
                '<button class="lg-next lg-icon">' + this.s.nextHtml + '</button>' +
                '</div>';
        }

        if (this.s.appendSubHtmlTo === '.lg-sub-html') {
            subHtmlCont = '<div class="lg-sub-html"></div>';
        }

        template = '<div class="lg-outer ' + this.s.addClass + ' ' + this.s.startClass + '">' +
            '<div class="lg" style="width:' + this.s.width + '; height:' + this.s.height + '">' +
            '<div class="lg-inner">' + list + '</div>' +
            '<div class="lg-toolbar lg-group">' +
            '<span class="lg-close lg-icon"></span>' +
            '</div>' +
            controls +
            subHtmlCont +
            '</div>' +
            '</div>';

        $('body').append(template);
        this.$outer = $('.lg-outer');
        this.$slide = this.$outer.find('.lg-item');

        if (this.s.useLeft) {
            this.$outer.addClass('lg-use-left');

            // Set mode lg-slide if use left is true;
            this.s.mode = 'lg-slide';
        } else {
            this.$outer.addClass('lg-use-css3');
        }

        // For fixed height gallery
        _this.setTop();
        $(window).on('resize.lg orientationchange.lg', function() {
            setTimeout(function() {
                _this.setTop();
            }, 100);
        });

        // add class lg-current to remove initial transition
        this.$slide.eq(this.index).addClass('lg-current');

        // add Class for css support and transition mode
        if (this.doCss()) {
            this.$outer.addClass('lg-css3');
        } else {
            this.$outer.addClass('lg-css');

            // Set speed 0 because no animation will happen if browser doesn't support css3
            this.s.speed = 0;
        }

        this.$outer.addClass(this.s.mode);

        if (this.s.enableDrag && this.$items.length > 1) {
            this.$outer.addClass('lg-grab');
        }

        if (this.s.showAfterLoad) {
            this.$outer.addClass('lg-show-after-load');
        }

        if (this.doCss()) {
            var $inner = this.$outer.find('.lg-inner');
            $inner.css('transition-timing-function', this.s.cssEasing);
            $inner.css('transition-duration', this.s.speed + 'ms');
        }

        setTimeout(function() {
            $('.lg-backdrop').addClass('in');
        });

        setTimeout(function() {
            _this.$outer.addClass('lg-visible');
        }, this.s.backdropDuration);

        if (this.s.download) {
            this.$outer.find('.lg-toolbar').append('<a id="lg-download" target="_blank" download class="lg-download lg-icon"></a>');
        }

        // Store the current scroll top value to scroll back after closing the gallery..
        this.prevScrollTop = $(window).scrollTop();

    };

    // For fixed height gallery
    Plugin.prototype.setTop = function() {
        if (this.s.height !== '100%') {
            var wH = $(window).height();
            var top = (wH - parseInt(this.s.height, 10)) / 2;
            var $lGallery = this.$outer.find('.lg');
            if (wH >= parseInt(this.s.height, 10)) {
                $lGallery.css('top', top + 'px');
            } else {
                $lGallery.css('top', '0px');
            }
        }
    };

    // Find css3 support
    Plugin.prototype.doCss = function() {
        // check for css animation support
        var support = function() {
            var transition = ['transition', 'MozTransition', 'WebkitTransition', 'OTransition', 'msTransition', 'KhtmlTransition'];
            var root = document.documentElement;
            var i = 0;
            for (i = 0; i < transition.length; i++) {
                if (transition[i] in root.style) {
                    return true;
                }
            }
        };

        if (support()) {
            return true;
        }

        return false;
    };

    /**
     *  @desc Check the given src is video
     *  @param {String} src
     *  @return {Object} video type
     *  Ex:{ youtube  :  ["//www.youtube.com/watch?v=c0asJgSyxcY", "c0asJgSyxcY"] }
     */
    Plugin.prototype.isVideo = function(src, index) {

        var html;
        if (this.s.dynamic) {
            html = this.s.dynamicEl[index].html;
        } else {
            html = this.$items.eq(index).attr('data-html');
        }

        if (!src) {
            if(html) {
                return {
                    html5: true
                };
            } else {
                console.error('lightGallery :- data-src is not pvovided on slide item ' + (index + 1) + '. Please make sure the selector property is properly configured. More info - http://sachinchoolur.github.io/lightGallery/demos/html-markup.html');
                return false;
            }
        }

        var youtube = src.match(/\/\/(?:www\.)?youtu(?:\.be|be\.com|be-nocookie\.com)\/(?:watch\?v=|embed\/)?([a-z0-9\-\_\%]+)/i);
        var vimeo = src.match(/\/\/(?:www\.)?vimeo.com\/([0-9a-z\-_]+)/i);
        var dailymotion = src.match(/\/\/(?:www\.)?dai.ly\/([0-9a-z\-_]+)/i);
        var vk = src.match(/\/\/(?:www\.)?(?:vk\.com|vkontakte\.ru)\/(?:video_ext\.php\?)(.*)/i);

        if (youtube) {
            return {
                youtube: youtube
            };
        } else if (vimeo) {
            return {
                vimeo: vimeo
            };
        } else if (dailymotion) {
            return {
                dailymotion: dailymotion
            };
        } else if (vk) {
            return {
                vk: vk
            };
        }
    };

    /**
     *  @desc Create image counter
     *  Ex: 1/10
     */
    Plugin.prototype.counter = function() {
        if (this.s.counter) {
            $(this.s.appendCounterTo).append('<div id="lg-counter"><span id="lg-counter-current">' + (parseInt(this.index, 10) + 1) + '</span> / <span id="lg-counter-all">' + this.$items.length + '</span></div>');
        }
    };

    /**
     *  @desc add sub-html into the slide
     *  @param {Number} index - index of the slide
     */
    Plugin.prototype.addHtml = function(index) {
        var subHtml = null;
        var subHtmlUrl;
        var $currentEle;
        if (this.s.dynamic) {
            if (this.s.dynamicEl[index].subHtmlUrl) {
                subHtmlUrl = this.s.dynamicEl[index].subHtmlUrl;
            } else {
                subHtml = this.s.dynamicEl[index].subHtml;
            }
        } else {
            $currentEle = this.$items.eq(index);
            if ($currentEle.attr('data-sub-html-url')) {
                subHtmlUrl = $currentEle.attr('data-sub-html-url');
            } else {
                subHtml = $currentEle.attr('data-sub-html');
                if (this.s.getCaptionFromTitleOrAlt && !subHtml) {
                    subHtml = $currentEle.attr('title') || $currentEle.find('img').first().attr('alt');
                }
            }
        }

        if (!subHtmlUrl) {
            if (typeof subHtml !== 'undefined' && subHtml !== null) {

                // get first letter of subhtml
                // if first letter starts with . or # get the html form the jQuery object
                var fL = subHtml.substring(0, 1);
                if (fL === '.' || fL === '#') {
                    if (this.s.subHtmlSelectorRelative && !this.s.dynamic) {
                        subHtml = $currentEle.find(subHtml).html();
                    } else {
                        subHtml = $(subHtml).html();
                    }
                }
            } else {
                subHtml = '';
            }
        }

        if (this.s.appendSubHtmlTo === '.lg-sub-html') {

            if (subHtmlUrl) {
                this.$outer.find(this.s.appendSubHtmlTo).load(subHtmlUrl);
            } else {
                this.$outer.find(this.s.appendSubHtmlTo).html(subHtml);
            }

        } else {

            if (subHtmlUrl) {
                this.$slide.eq(index).load(subHtmlUrl);
            } else {
                this.$slide.eq(index).append(subHtml);
            }
        }

        // Add lg-empty-html class if title doesn't exist
        if (typeof subHtml !== 'undefined' && subHtml !== null) {
            if (subHtml === '') {
                this.$outer.find(this.s.appendSubHtmlTo).addClass('lg-empty-html');
            } else {
                this.$outer.find(this.s.appendSubHtmlTo).removeClass('lg-empty-html');
            }
        }

        this.$el.trigger('onAfterAppendSubHtml.lg', [index]);
    };

    /**
     *  @desc Preload slides
     *  @param {Number} index - index of the slide
     */
    Plugin.prototype.preload = function(index) {
        var i = 1;
        var j = 1;
        for (i = 1; i <= this.s.preload; i++) {
            if (i >= this.$items.length - index) {
                break;
            }

            this.loadContent(index + i, false, 0);
        }

        for (j = 1; j <= this.s.preload; j++) {
            if (index - j < 0) {
                break;
            }

            this.loadContent(index - j, false, 0);
        }
    };

    /**
     *  @desc Load slide content into slide.
     *  @param {Number} index - index of the slide.
     *  @param {Boolean} rec - if true call loadcontent() function again.
     *  @param {Boolean} delay - delay for adding complete class. it is 0 except first time.
     */
    Plugin.prototype.loadContent = function(index, rec, delay) {

        var _this = this;
        var _hasPoster = false;
        var _$img;
        var _src;
        var _poster;
        var _srcset;
        var _sizes;
        var _html;
        var getResponsiveSrc = function(srcItms) {
            var rsWidth = [];
            var rsSrc = [];
            for (var i = 0; i < srcItms.length; i++) {
                var __src = srcItms[i].split(' ');

                // Manage empty space
                if (__src[0] === '') {
                    __src.splice(0, 1);
                }

                rsSrc.push(__src[0]);
                rsWidth.push(__src[1]);
            }

            var wWidth = $(window).width();
            for (var j = 0; j < rsWidth.length; j++) {
                if (parseInt(rsWidth[j], 10) > wWidth) {
                    _src = rsSrc[j];
                    break;
                }
            }
        };

        if (_this.s.dynamic) {

            if (_this.s.dynamicEl[index].poster) {
                _hasPoster = true;
                _poster = _this.s.dynamicEl[index].poster;
            }

            _html = _this.s.dynamicEl[index].html;
            _src = _this.s.dynamicEl[index].src;

            if (_this.s.dynamicEl[index].responsive) {
                var srcDyItms = _this.s.dynamicEl[index].responsive.split(',');
                getResponsiveSrc(srcDyItms);
            }

            _srcset = _this.s.dynamicEl[index].srcset;
            _sizes = _this.s.dynamicEl[index].sizes;

        } else {

            if (_this.$items.eq(index).attr('data-poster')) {
                _hasPoster = true;
                _poster = _this.$items.eq(index).attr('data-poster');
            }

            _html = _this.$items.eq(index).attr('data-html');
            _src = _this.$items.eq(index).attr('href') || _this.$items.eq(index).attr('data-src');

            if (_this.$items.eq(index).attr('data-responsive')) {
                var srcItms = _this.$items.eq(index).attr('data-responsive').split(',');
                getResponsiveSrc(srcItms);
            }

            _srcset = _this.$items.eq(index).attr('data-srcset');
            _sizes = _this.$items.eq(index).attr('data-sizes');

        }

        //if (_src || _srcset || _sizes || _poster) {

        var iframe = false;
        if (_this.s.dynamic) {
            if (_this.s.dynamicEl[index].iframe) {
                iframe = true;
            }
        } else {
            if (_this.$items.eq(index).attr('data-iframe') === 'true') {
                iframe = true;
            }
        }

        var _isVideo = _this.isVideo(_src, index);
        if (!_this.$slide.eq(index).hasClass('lg-loaded')) {
            if (iframe) {
                _this.$slide.eq(index).prepend('<div class="lg-video-cont lg-has-iframe" style="max-width:' + _this.s.iframeMaxWidth + '"><div class="lg-video"><iframe class="lg-object" frameborder="0" src="' + _src + '"  allowfullscreen="true"></iframe></div></div>');
            } else if (_hasPoster) {
                var videoClass = '';
                if (_isVideo && _isVideo.youtube) {
                    videoClass = 'lg-has-youtube';
                } else if (_isVideo && _isVideo.vimeo) {
                    videoClass = 'lg-has-vimeo';
                } else {
                    videoClass = 'lg-has-html5';
                }

                _this.$slide.eq(index).prepend('<div class="lg-video-cont ' + videoClass + ' "><div class="lg-video"><span class="lg-video-play"></span><img class="lg-object lg-has-poster" src="' + _poster + '" /></div></div>');

            } else if (_isVideo) {
                _this.$slide.eq(index).prepend('<div class="lg-video-cont "><div class="lg-video"></div></div>');
                _this.$el.trigger('hasVideo.lg', [index, _src, _html]);
            } else {
                _this.$slide.eq(index).prepend('<div class="lg-img-wrap"><img class="lg-object lg-image" src="' + _src + '" /></div>');
            }

            _this.$el.trigger('onAferAppendSlide.lg', [index]);

            _$img = _this.$slide.eq(index).find('.lg-object');
            if (_sizes) {
                _$img.attr('sizes', _sizes);
            }

            if (_srcset) {
                _$img.attr('srcset', _srcset);
                try {
                    picturefill({
                        elements: [_$img[0]]
                    });
                } catch (e) {
                    console.warn('lightGallery :- If you want srcset to be supported for older browser please include picturefil version 2 javascript library in your document.');
                }
            }

            if (this.s.appendSubHtmlTo !== '.lg-sub-html') {
                _this.addHtml(index);
            }

            _this.$slide.eq(index).addClass('lg-loaded');
        }

        _this.$slide.eq(index).find('.lg-object').on('load.lg error.lg', function() {

            // For first time add some delay for displaying the start animation.
            var _speed = 0;

            // Do not change the delay value because it is required for zoom plugin.
            // If gallery opened from direct url (hash) speed value should be 0
            if (delay && !$('body').hasClass('lg-from-hash')) {
                _speed = delay;
            }

            setTimeout(function() {
                _this.$slide.eq(index).addClass('lg-complete');
                _this.$el.trigger('onSlideItemLoad.lg', [index, delay || 0]);
            }, _speed);

        });

        // @todo check load state for html5 videos
        if (_isVideo && _isVideo.html5 && !_hasPoster) {
            _this.$slide.eq(index).addClass('lg-complete');
        }

        if (rec === true) {
            if (!_this.$slide.eq(index).hasClass('lg-complete')) {
                _this.$slide.eq(index).find('.lg-object').on('load.lg error.lg', function() {
                    _this.preload(index);
                });
            } else {
                _this.preload(index);
            }
        }

        //}
    };

    /**
    *   @desc slide function for lightgallery
        ** Slide() gets call on start
        ** ** Set lg.on true once slide() function gets called.
        ** Call loadContent() on slide() function inside setTimeout
        ** ** On first slide we do not want any animation like slide of fade
        ** ** So on first slide( if lg.on if false that is first slide) loadContent() should start loading immediately
        ** ** Else loadContent() should wait for the transition to complete.
        ** ** So set timeout s.speed + 50
    <=> ** loadContent() will load slide content in to the particular slide
        ** ** It has recursion (rec) parameter. if rec === true loadContent() will call preload() function.
        ** ** preload will execute only when the previous slide is fully loaded (images iframe)
        ** ** avoid simultaneous image load
    <=> ** Preload() will check for s.preload value and call loadContent() again accoring to preload value
        ** loadContent()  <====> Preload();

    *   @param {Number} index - index of the slide
    *   @param {Boolean} fromTouch - true if slide function called via touch event or mouse drag
    *   @param {Boolean} fromThumb - true if slide function called via thumbnail click
    *   @param {String} direction - Direction of the slide(next/prev)
    */
    Plugin.prototype.slide = function(index, fromTouch, fromThumb, direction) {

        var _prevIndex = this.$outer.find('.lg-current').index();
        var _this = this;

        // Prevent if multiple call
        // Required for hsh plugin
        if (_this.lGalleryOn && (_prevIndex === index)) {
            return;
        }

        var _length = this.$slide.length;
        var _time = _this.lGalleryOn ? this.s.speed : 0;

        if (!_this.lgBusy) {

            if (this.s.download) {
                var _src;
                if (_this.s.dynamic) {
                    _src = _this.s.dynamicEl[index].downloadUrl !== false && (_this.s.dynamicEl[index].downloadUrl || _this.s.dynamicEl[index].src);
                } else {
                    _src = _this.$items.eq(index).attr('data-download-url') !== 'false' && (_this.$items.eq(index).attr('data-download-url') || _this.$items.eq(index).attr('href') || _this.$items.eq(index).attr('data-src'));

                }

                if (_src) {
                    $('#lg-download').attr('href', _src);
                    _this.$outer.removeClass('lg-hide-download');
                } else {
                    _this.$outer.addClass('lg-hide-download');
                }
            }

            this.$el.trigger('onBeforeSlide.lg', [_prevIndex, index, fromTouch, fromThumb]);

            _this.lgBusy = true;

            clearTimeout(_this.hideBartimeout);

            // Add title if this.s.appendSubHtmlTo === lg-sub-html
            if (this.s.appendSubHtmlTo === '.lg-sub-html') {

                // wait for slide animation to complete
                setTimeout(function() {
                    _this.addHtml(index);
                }, _time);
            }

            this.arrowDisable(index);

            if (!direction) {
                if (index < _prevIndex) {
                    direction = 'prev';
                } else if (index > _prevIndex) {
                    direction = 'next';
                }
            }

            if (!fromTouch) {

                // remove all transitions
                _this.$outer.addClass('lg-no-trans');

                this.$slide.removeClass('lg-prev-slide lg-next-slide');

                if (direction === 'prev') {

                    //prevslide
                    this.$slide.eq(index).addClass('lg-prev-slide');
                    this.$slide.eq(_prevIndex).addClass('lg-next-slide');
                } else {

                    // next slide
                    this.$slide.eq(index).addClass('lg-next-slide');
                    this.$slide.eq(_prevIndex).addClass('lg-prev-slide');
                }

                // give 50 ms for browser to add/remove class
                setTimeout(function() {
                    _this.$slide.removeClass('lg-current');

                    //_this.$slide.eq(_prevIndex).removeClass('lg-current');
                    _this.$slide.eq(index).addClass('lg-current');

                    // reset all transitions
                    _this.$outer.removeClass('lg-no-trans');
                }, 50);
            } else {

                this.$slide.removeClass('lg-prev-slide lg-current lg-next-slide');
                var touchPrev;
                var touchNext;
                if (_length > 2) {
                    touchPrev = index - 1;
                    touchNext = index + 1;

                    if ((index === 0) && (_prevIndex === _length - 1)) {

                        // next slide
                        touchNext = 0;
                        touchPrev = _length - 1;
                    } else if ((index === _length - 1) && (_prevIndex === 0)) {

                        // prev slide
                        touchNext = 0;
                        touchPrev = _length - 1;
                    }

                } else {
                    touchPrev = 0;
                    touchNext = 1;
                }

                if (direction === 'prev') {
                    _this.$slide.eq(touchNext).addClass('lg-next-slide');
                } else {
                    _this.$slide.eq(touchPrev).addClass('lg-prev-slide');
                }

                _this.$slide.eq(index).addClass('lg-current');
            }

            if (_this.lGalleryOn) {
                setTimeout(function() {
                    _this.loadContent(index, true, 0);
                }, this.s.speed + 50);

                setTimeout(function() {
                    _this.lgBusy = false;
                    _this.$el.trigger('onAfterSlide.lg', [_prevIndex, index, fromTouch, fromThumb]);
                }, this.s.speed);

            } else {
                _this.loadContent(index, true, _this.s.backdropDuration);

                _this.lgBusy = false;
                _this.$el.trigger('onAfterSlide.lg', [_prevIndex, index, fromTouch, fromThumb]);
            }

            _this.lGalleryOn = true;

            if (this.s.counter) {
                $('#lg-counter-current').text(index + 1);
            }

        }
        _this.index = index;

    };

    /**
     *  @desc Go to next slide
     *  @param {Boolean} fromTouch - true if slide function called via touch event
     */
    Plugin.prototype.goToNextSlide = function(fromTouch) {
        var _this = this;
        var _loop = _this.s.loop;
        if (fromTouch && _this.$slide.length < 3) {
            _loop = false;
        }

        if (!_this.lgBusy) {
            if ((_this.index + 1) < _this.$slide.length) {
                _this.index++;
                _this.$el.trigger('onBeforeNextSlide.lg', [_this.index]);
                _this.slide(_this.index, fromTouch, false, 'next');
            } else {
                if (_loop) {
                    _this.index = 0;
                    _this.$el.trigger('onBeforeNextSlide.lg', [_this.index]);
                    _this.slide(_this.index, fromTouch, false, 'next');
                } else if (_this.s.slideEndAnimatoin && !fromTouch) {
                    _this.$outer.addClass('lg-right-end');
                    setTimeout(function() {
                        _this.$outer.removeClass('lg-right-end');
                    }, 400);
                }
            }
        }
    };

    /**
     *  @desc Go to previous slide
     *  @param {Boolean} fromTouch - true if slide function called via touch event
     */
    Plugin.prototype.goToPrevSlide = function(fromTouch) {
        var _this = this;
        var _loop = _this.s.loop;
        if (fromTouch && _this.$slide.length < 3) {
            _loop = false;
        }

        if (!_this.lgBusy) {
            if (_this.index > 0) {
                _this.index--;
                _this.$el.trigger('onBeforePrevSlide.lg', [_this.index, fromTouch]);
                _this.slide(_this.index, fromTouch, false, 'prev');
            } else {
                if (_loop) {
                    _this.index = _this.$items.length - 1;
                    _this.$el.trigger('onBeforePrevSlide.lg', [_this.index, fromTouch]);
                    _this.slide(_this.index, fromTouch, false, 'prev');
                } else if (_this.s.slideEndAnimatoin && !fromTouch) {
                    _this.$outer.addClass('lg-left-end');
                    setTimeout(function() {
                        _this.$outer.removeClass('lg-left-end');
                    }, 400);
                }
            }
        }
    };

    Plugin.prototype.keyPress = function() {
        var _this = this;
        if (this.$items.length > 1) {
            $(window).on('keyup.lg', function(e) {
                if (_this.$items.length > 1) {
                    if (e.keyCode === 37) {
                        e.preventDefault();
                        _this.goToPrevSlide();
                    }

                    if (e.keyCode === 39) {
                        e.preventDefault();
                        _this.goToNextSlide();
                    }
                }
            });
        }

        $(window).on('keydown.lg', function(e) {
            if (_this.s.escKey === true && e.keyCode === 27) {
                e.preventDefault();
                if (!_this.$outer.hasClass('lg-thumb-open')) {
                    _this.destroy();
                } else {
                    _this.$outer.removeClass('lg-thumb-open');
                }
            }
        });
    };

    Plugin.prototype.arrow = function() {
        var _this = this;
        this.$outer.find('.lg-prev').on('click.lg', function() {
            _this.goToPrevSlide();
        });

        this.$outer.find('.lg-next').on('click.lg', function() {
            _this.goToNextSlide();
        });
    };

    Plugin.prototype.arrowDisable = function(index) {

        // Disable arrows if s.hideControlOnEnd is true
        if (!this.s.loop && this.s.hideControlOnEnd) {
            if ((index + 1) < this.$slide.length) {
                this.$outer.find('.lg-next').removeAttr('disabled').removeClass('disabled');
            } else {
                this.$outer.find('.lg-next').attr('disabled', 'disabled').addClass('disabled');
            }

            if (index > 0) {
                this.$outer.find('.lg-prev').removeAttr('disabled').removeClass('disabled');
            } else {
                this.$outer.find('.lg-prev').attr('disabled', 'disabled').addClass('disabled');
            }
        }
    };

    Plugin.prototype.setTranslate = function($el, xValue, yValue) {
        // jQuery supports Automatic CSS prefixing since jQuery 1.8.0
        if (this.s.useLeft) {
            $el.css('left', xValue);
        } else {
            $el.css({
                transform: 'translate3d(' + (xValue) + 'px, ' + yValue + 'px, 0px)'
            });
        }
    };

    Plugin.prototype.touchMove = function(startCoords, endCoords) {

        var distance = endCoords - startCoords;

        if (Math.abs(distance) > 15) {
            // reset opacity and transition duration
            this.$outer.addClass('lg-dragging');

            // move current slide
            this.setTranslate(this.$slide.eq(this.index), distance, 0);

            // move next and prev slide with current slide
            this.setTranslate($('.lg-prev-slide'), -this.$slide.eq(this.index).width() + distance, 0);
            this.setTranslate($('.lg-next-slide'), this.$slide.eq(this.index).width() + distance, 0);
        }
    };

    Plugin.prototype.touchEnd = function(distance) {
        var _this = this;

        // keep slide animation for any mode while dragg/swipe
        if (_this.s.mode !== 'lg-slide') {
            _this.$outer.addClass('lg-slide');
        }

        this.$slide.not('.lg-current, .lg-prev-slide, .lg-next-slide').css('opacity', '0');

        // set transition duration
        setTimeout(function() {
            _this.$outer.removeClass('lg-dragging');
            if ((distance < 0) && (Math.abs(distance) > _this.s.swipeThreshold)) {
                _this.goToNextSlide(true);
            } else if ((distance > 0) && (Math.abs(distance) > _this.s.swipeThreshold)) {
                _this.goToPrevSlide(true);
            } else if (Math.abs(distance) < 5) {

                // Trigger click if distance is less than 5 pix
                _this.$el.trigger('onSlideClick.lg');
            }

            _this.$slide.removeAttr('style');
        });

        // remove slide class once drag/swipe is completed if mode is not slide
        setTimeout(function() {
            if (!_this.$outer.hasClass('lg-dragging') && _this.s.mode !== 'lg-slide') {
                _this.$outer.removeClass('lg-slide');
            }
        }, _this.s.speed + 100);

    };

    Plugin.prototype.enableSwipe = function() {
        var _this = this;
        var startCoords = 0;
        var endCoords = 0;
        var isMoved = false;

        if (_this.s.enableSwipe && _this.doCss()) {

            _this.$slide.on('touchstart.lg', function(e) {
                if (!_this.$outer.hasClass('lg-zoomed') && !_this.lgBusy) {
                    e.preventDefault();
                    _this.manageSwipeClass();
                    startCoords = e.originalEvent.targetTouches[0].pageX;
                }
            });

            _this.$slide.on('touchmove.lg', function(e) {
                if (!_this.$outer.hasClass('lg-zoomed')) {
                    e.preventDefault();
                    endCoords = e.originalEvent.targetTouches[0].pageX;
                    _this.touchMove(startCoords, endCoords);
                    isMoved = true;
                }
            });

            _this.$slide.on('touchend.lg', function() {
                if (!_this.$outer.hasClass('lg-zoomed')) {
                    if (isMoved) {
                        isMoved = false;
                        _this.touchEnd(endCoords - startCoords);
                    } else {
                        _this.$el.trigger('onSlideClick.lg');
                    }
                }
            });
        }

    };

    Plugin.prototype.enableDrag = function() {
        var _this = this;
        var startCoords = 0;
        var endCoords = 0;
        var isDraging = false;
        var isMoved = false;
        if (_this.s.enableDrag && _this.doCss()) {
            _this.$slide.on('mousedown.lg', function(e) {
                if (!_this.$outer.hasClass('lg-zoomed') && !_this.lgBusy && !$(e.target).text().trim()) {
                    e.preventDefault();
                    _this.manageSwipeClass();
                    startCoords = e.pageX;
                    isDraging = true;

                    // ** Fix for webkit cursor issue https://code.google.com/p/chromium/issues/detail?id=26723
                    _this.$outer.scrollLeft += 1;
                    _this.$outer.scrollLeft -= 1;

                    // *

                    _this.$outer.removeClass('lg-grab').addClass('lg-grabbing');

                    _this.$el.trigger('onDragstart.lg');
                }
            });

            $(window).on('mousemove.lg', function(e) {
                if (isDraging) {
                    isMoved = true;
                    endCoords = e.pageX;
                    _this.touchMove(startCoords, endCoords);
                    _this.$el.trigger('onDragmove.lg');
                }
            });

            $(window).on('mouseup.lg', function(e) {
                if (isMoved) {
                    isMoved = false;
                    _this.touchEnd(endCoords - startCoords);
                    _this.$el.trigger('onDragend.lg');
                } else if ($(e.target).hasClass('lg-object') || $(e.target).hasClass('lg-video-play')) {
                    _this.$el.trigger('onSlideClick.lg');
                }

                // Prevent execution on click
                if (isDraging) {
                    isDraging = false;
                    _this.$outer.removeClass('lg-grabbing').addClass('lg-grab');
                }
            });

        }
    };

    Plugin.prototype.manageSwipeClass = function() {
        var _touchNext = this.index + 1;
        var _touchPrev = this.index - 1;
        if (this.s.loop && this.$slide.length > 2) {
            if (this.index === 0) {
                _touchPrev = this.$slide.length - 1;
            } else if (this.index === this.$slide.length - 1) {
                _touchNext = 0;
            }
        }

        this.$slide.removeClass('lg-next-slide lg-prev-slide');
        if (_touchPrev > -1) {
            this.$slide.eq(_touchPrev).addClass('lg-prev-slide');
        }

        this.$slide.eq(_touchNext).addClass('lg-next-slide');
    };

    Plugin.prototype.mousewheel = function() {
        var _this = this;
        _this.$outer.on('mousewheel.lg', function(e) {

            if (!e.deltaY) {
                return;
            }

            if (e.deltaY > 0) {
                _this.goToPrevSlide();
            } else {
                _this.goToNextSlide();
            }

            e.preventDefault();
        });

    };

    Plugin.prototype.closeGallery = function() {

        var _this = this;
        var mousedown = false;
        this.$outer.find('.lg-close').on('click.lg', function() {
            _this.destroy();
        });

        if (_this.s.closable) {

            // If you drag the slide and release outside gallery gets close on chrome
            // for preventing this check mousedown and mouseup happened on .lg-item or lg-outer
            _this.$outer.on('mousedown.lg', function(e) {

                if ($(e.target).is('.lg-outer') || $(e.target).is('.lg-item ') || $(e.target).is('.lg-img-wrap')) {
                    mousedown = true;
                } else {
                    mousedown = false;
                }

            });
            
            _this.$outer.on('mousemove.lg', function() {
                mousedown = false;
            });

            _this.$outer.on('mouseup.lg', function(e) {

                if ($(e.target).is('.lg-outer') || $(e.target).is('.lg-item ') || $(e.target).is('.lg-img-wrap') && mousedown) {
                    if (!_this.$outer.hasClass('lg-dragging')) {
                        _this.destroy();
                    }
                }

            });

        }

    };

    Plugin.prototype.destroy = function(d) {

        var _this = this;

        if (!d) {
            _this.$el.trigger('onBeforeClose.lg');
            $(window).scrollTop(_this.prevScrollTop);
        }


        /**
         * if d is false or undefined destroy will only close the gallery
         * plugins instance remains with the element
         *
         * if d is true destroy will completely remove the plugin
         */

        if (d) {
            if (!_this.s.dynamic) {
                // only when not using dynamic mode is $items a jquery collection
                this.$items.off('click.lg click.lgcustom');
            }

            $.removeData(_this.el, 'lightGallery');
        }

        // Unbind all events added by lightGallery
        this.$el.off('.lg.tm');

        // Distroy all lightGallery modules
        $.each($.fn.lightGallery.modules, function(key) {
            if (_this.modules[key]) {
                _this.modules[key].destroy();
            }
        });

        this.lGalleryOn = false;

        clearTimeout(_this.hideBartimeout);
        this.hideBartimeout = false;
        $(window).off('.lg');
        $('body').removeClass('lg-on lg-from-hash');

        if (_this.$outer) {
            _this.$outer.removeClass('lg-visible');
        }

        $('.lg-backdrop').removeClass('in');

        setTimeout(function() {
            if (_this.$outer) {
                _this.$outer.remove();
            }

            $('.lg-backdrop').remove();

            if (!d) {
                _this.$el.trigger('onCloseAfter.lg');
            }

        }, _this.s.backdropDuration + 50);
    };

    $.fn.lightGallery = function(options) {
        return this.each(function() {
            if (!$.data(this, 'lightGallery')) {
                $.data(this, 'lightGallery', new Plugin(this, options));
            } else {
                try {
                    $(this).data('lightGallery').init();
                } catch (err) {
                    console.error('lightGallery has not initiated properly');
                }
            }
        });
    };

    $.fn.lightGallery.modules = {};

})();