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            value: function(target, firstSource) {
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            evt.initCustomEvent( event, params.bubbles, params.cancelable, params.detail );
            return evt;
        }
        CustomEvent.prototype = window.Event.prototype;
        window.CustomEvent = CustomEvent;
    }

    function getRootScrollTop() {
        return window.pageYOffset || document.documentElement.scrollTop;
    }

    function getNodePosition(node) {
        try {
            var position = node.getBoundingClientRect();
            return {
                left: position.left,
                top: position.top + getRootScrollTop(),
                width: position.width,
                height: position.height
            };
        } catch (err) {
            return null;
        }
    }

    function getAncestorNode(node, className) {
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                return node;
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        return null;
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        } else if (typeof node.attachEvent == 'function') {
            node.attachEvent('on' + event, callback);
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    function LazyGroup(node, type) {
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        this.type = type || 'default';
        this.position = null;
        this.showed = false;
        this.items = [];
        this.itemLoaded = 0;
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    LazyGroup.prototype = {
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            return this.type;
        },

        getItems: function() {
            return this.items;
        },

        allItemsLoaded: function() {
            return this.items.length == this.itemLoaded;
        },

        updatePosition: function() {
            this.position = getNodePosition(this.node);
        },

        getPosition: function() {
            return this.position;
        },

        getNode: function() {
            return this.node;
        },

        addItem: function(item) {
            if (this.isShowed()) {
                this.showItem(item);
            }

            this.items.push(item);
        },

        showItem: function(item) {
            var self = this;
            item.show(function(event) {
                self.itemLoaded++;
                item.loaded(self);
            });
        },

        show: function(force) {
            var self = this;

            if (this.isShowed()) {
                return;
            }

            if (force === undefined) {
                force = false;
            }

            this.showed = true;

            this.items.forEach(function(item) {
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                }
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            this.dispatchShowedEvent();
        },

        isShowed: function() {
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        hasItems: function() {
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            }));
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    };

    function LazyItem(node, data) {
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        this.data = data || {};
        this.showed = false;
        this.initType();
    }

    LazyItem.prototype = {
        getNode: function() {
            return this.node;
        },

        show: function(loadedCallback) {
            if (this.isShowed()) {
                return;
            }

            loadedCallback = loadedCallback || null;

            this.showed = true;

            switch (this.getType()) {
                case 'image':
                    this.showImage(loadedCallback);
                    break;

                case 'iframe':
                    this.showIframe(loadedCallback);
                    break;

                case 'custom':
                    this.showCustom(loadedCallback);
                    break;

                default:
                    this.showDefault(loadedCallback);
            }
        },

        showImage: function(loadedCallback) {
            if (loadedCallback !== undefined && typeof loadedCallback === 'function') {
                addEvent(this.node, 'load', function(event) { loadedCallback(event); }, true);
            }

            if (this.data.sources !== undefined && this.data.sources !== null && this.data.sources != '') {
                this.node.insertAdjacentHTML('beforebegin', this.data.sources);
            }

            var srcSet = this.node.getAttribute('data-tgpli-srcset');
            if (srcSet) {
                this.node.setAttribute('srcset', srcSet);
            }

            var src = this.node.getAttribute('data-tgpli-src');
            if (src) {
                this.node.src = src;
            }

            this.node.removeAttribute('data-tgpli-image-inited');
        },

        showDefault: function(loadedCallback) {
            this.node.classList.remove('tgpli-background-inited');
        },

        showIframe: function(loadedCallback) {
            var src = this.node.getAttribute('data-tgpli-src');
            if (src) {
                this.node.src = src;
            }

            this.node.removeAttribute('data-tgpli-iframe-inited');
        },

        showCustom: function(loadedCallback) {
            var action = this.node.getAttribute('data-tgpli-action');
            if (action && window[action] !== undefined && typeof window[action] == 'function') {
                window[action]();
            }

            this.node.removeAttribute('data-tgpli-custom-inited');
        },

        isShowed: function() {
            return this.showed;
        },

        initType: function() {
            if (this.data != undefined && this.data.customItem === true) {
                this.type = 'custom';
                return;
            }

            switch (this.node.nodeName.toUpperCase()) {
                case 'IMG':
                    this.type = 'image';
                    break;

                case 'IFRAME':
                    this.type = 'iframe';
                    break;

                default:
                    this.type = 'default';
            }
        },

        getType: function() {
            return this.type;
        },

        getGroupNodeInfo: function() {
            if (this.data != undefined && this.data.customItem === true) {
                return {
                    node: this.node,
                    type: 'custom'
                };
            }

            switch (this.getType()) {
                case 'image':
                    return this.getImageGroupNode();

                case 'iframe':
                    return {
                        node: this.node.parentNode,
                        type: 'iframe'
                    };

                default:
                    return {
                        node: this.node,
                        type: 'default'
                    };
            }
        },

        getImageGroupNode: function() {
            var id = this.node.id;

            if (this.node.parentNode.classList.contains('logo')) {
                return {
                    node: this.node.parentNode,
                    type: 'logo'
                };
            }

            if (id && document.querySelector('div.gem-client-item #' + id) !== null) {
                var ancestorNode = getAncestorNode(this.node, 'gem-clients-type-carousel-grid');
                if (ancestorNode === null) {
                    var ancestorNode = getAncestorNode(this.node, 'gem_client_carousel-items');
                }
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'gem-clients'
                    };
                }
            }

            if (id && document.querySelector('#colophon .footer-widget-area #' + id) !== null) {
                var ancestorNode = getAncestorNode(this.node, 'footer-widget-area');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'footer-widget-area'
                    };
                }
            }

            if (
                (this.node.className && this.node.className.indexOf('portfolio') != -1) ||
                (id && document.querySelector('div.portfolio #' + id) !== null &&
                    !(this.node.closest('div.portfolio').classList.contains('extended-products-grid') &&
                        this.node.closest('div.portfolio').classList.contains('portfolio-style-justified')) )
            ) {
                var ancestorNode = getAncestorNode(this.node, 'portfolio');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'portfolio'
                    };
                }
            }

            if (
                (this.node.className && this.node.className.indexOf('extended-carousel-grid') != -1) ||
                (id && document.querySelector('div.extended-carousel-grid #' + id) !== null &&
                    (this.node.closest('div.extended-carousel-grid').classList.contains('carousel-scroll-init')) )
            ) {
                var ancestorNode = getAncestorNode(this.node, 'extended-carousel-grid');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'products-carousel'
                    };
                }
            }

            if (
                (this.node.className && this.node.className.indexOf('gem-blog-slider') != -1) ||
                (id && document.querySelector('div.gem-blog-slider #' + id) !== null )
            ) {
                var ancestorNode = getAncestorNode(this.node, 'gem-blog-slider');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'blog-slider'
                    };
                }
            }

            if (
                (this.node.className && this.node.className.indexOf('gem-news-type-carousel') != -1) ||
                (id && document.querySelector('div.gem-news-type-carousel #' + id) !== null )
            ) {
                var ancestorNode = getAncestorNode(this.node, 'gem-news-type-carousel');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'gem-news-carousel'
                    };
                }
            }

            if (id && document.querySelector('div.blog #' + id) !== null) {
                var ancestorNode = getAncestorNode(this.node, 'blog');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'blog'
                    };
                }
            }

            if (id && document.querySelector('div.gem-gallery-grid #' + id) !== null) {
                var ancestorNode = getAncestorNode(this.node, 'gem-gallery-grid');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'gallery-grid'
                    };
                }
            }

            if (id && document.querySelector('div.gem-gallery #' + id) !== null) {
                var ancestorNode = getAncestorNode(this.node, 'gem-gallery');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'gallery'
                    };
                }
            }

            if (id && document.querySelector('div.gem-simple-gallery #' + id) !== null) {
                var ancestorNode = getAncestorNode(this.node, 'gem-simple-gallery');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'simple-gallery'
                    };
                }
            }

            if (id && document.querySelector('div.gem-slideshow #' + id) !== null) {
                var ancestorNode = getAncestorNode(this.node, 'gem-slideshow');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'gem-slideshow'
                    };
                }
            }

            if (id && document.querySelector('div.gem-testimonials #' + id) !== null) {
                var ancestorNode = getAncestorNode(this.node, 'gem-testimonials');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'gem-testimonials'
                    };
                }
            }

            if (id && document.querySelector('div.rev_slider_wrapper #' + id) !== null) {
                var ancestorNode = getAncestorNode(this.node, 'rev_slider_wrapper');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'rev_slider'
                    };
                }
            }

            if (id && document.querySelector('div.wpb_images_carousel #' + id) !== null) {
                var ancestorNode = getAncestorNode(this.node, 'wpb_images_carousel');
                if (ancestorNode !== null) {
                    return {
                        node: ancestorNode,
                        type: 'wpb_images_carousel'
                    };
                }
            }

            return {
                node: this.node.parentNode,
                type: 'default'
            };
        },

        imageShowed: function() {
            var id = this.node.id;

            if (id && document.querySelector('div.caroufredsel_wrapper #' + id) !== null) {
                window.dispatchEvent(new window.CustomEvent('resize'));
            }

            if (window.jQuery !== undefined && window.jQuery !== null &&
                window.jQuery.waypoints !== undefined && window.jQuery.waypoints !== null &&
                typeof window.jQuery.waypoints === "function"
            ) {
                window.jQuery.waypoints('refresh');
            }
        },

        loaded: function(group) {
            var groupItems = group.getItems();

            if (group.getType() == 'default' && groupItems.length == 1 && groupItems[0].getType() == 'image') {
                this.imageShowed();
            }

            if (group.getType() == 'wpb_images_carousel' && group.allItemsLoaded()) {
                window.dispatchEvent(new window.CustomEvent('resize'));
            }
        }
    };

    function LazyItems(options) {
        options = options || {};

        this.options = Object.assign({
            visibilityOffset: 300,
            desktopEnable: true,
            mobileEnable: true
        }, options);

        this.groups = [];
        this.scrollTop = 0;
        this.rootHeight = 0;
        this.checkGroupsProcess = false;
        this.enabled = false;
        this.isPageScroller = false;
        this.isFullpage = false;
        this.visibilityOffsetFixed = false;

        this.init();
    }

    LazyItems.prototype = {
        init: function() {
            this.checkEnabled();
            this.updateRootScrollTop();
            this.updateRootSize();
            this.initEvents();
            this.initQueueNodes();
        },

        checkEnabled: function() {
            var isMobile = isMobileDevice();
            this.enabled = !(excludedDevices()) && ((isMobile && this.options.mobileEnable) || (!isMobile && this.options.desktopEnable));
        },

        isEnabled: function() {
            return this.enabled;
        },

        initQueueNodes: function() {
            if (window.tgpQueue !== undefined) {
                this.addNodes(window.tgpQueue.flushNodes());
            }
        },

        initEvents: function() {
            var self = this;
            addEvent(window, 'resize', function() { self.resizeHandle(); }, true);
            addEvent(document, 'scroll', function() { self.scrollHandle(); }, true);
            addEvent(document, 'DOMContentLoaded', function() { self.documentReadyHandle(); }, true);
        },

        resizeHandle: function() {
            var self = this;
            setTimeout(function() {
                self.updateRootScrollTop();
                self.updateRootSize();
                self.updateGroupsPositions();
                self.checkGroups();
            }, 0);
        },

        scrollHandle: function() {
            if (!this.visibilityOffsetFixed) {
                this.visibilityOffsetFixed = true;
                this.options.visibilityOffset *= 1.5;
            }
            this.updateRootScrollTop();
            this.updateGroupsPositions();
            this.checkGroups();
        },

        documentReadyHandle: function() {
            this.collectCustomItems();
            this.detectPageScroller();
            this.detectFullpage();
            this.updateRootScrollTop();
            this.updateRootSize();
            this.updateGroupsPositions();
            this.checkGroups();
        },

        detectPageScroller: function() {
            var self = this;

            this.isPageScroller = document.body.classList.contains('page-scroller');

            if (this.isPageScroller) {
                addEvent(document, 'page-scroller-updated', function() {
                    self.scrollHandle();
                });
            }
        },

        detectFullpage: function() {
            var self = this;

            this.isFullpage = document.body.classList.contains('thegem-fp');

            if (this.isFullpage) {
                addEvent(document, 'fullpage-updated', function() {
                    self.scrollHandle();
                });
            }
        },

        hasGroups: function() {
            return this.groups.length > 0;
        },

        checkGroups: function() {
            var self = this;

            if (this.checkGroupsProcess || !this.hasGroups()) {
                return;
            }

            this.checkGroupsProcess = true;

            this.groups.forEach(function(group) {
                if (group.isShowed() || !group.hasItems()) {
                    return;
                }

                if (self.isVisibleGroup(group)) {
                    self.showGroup(group, false);
                }
            });

            this.checkGroupsProcess = false;
        },

        isVisibleGroup: function(group) {
            var rootPosition = this.getRootPosition(),
                groupPosition = group.getPosition();

            if (groupPosition === null) {
                return true;
            }

            if (groupPosition.left == 0 && groupPosition.top == 0 && groupPosition.width == 0 && groupPosition.height == 0) {
                return false;
            }

            return groupPosition.top - this.options.visibilityOffset <= rootPosition.bottom &&
                groupPosition.top + groupPosition.height + this.options.visibilityOffset >= rootPosition.top;
        },

        showGroup: function(group, force) {
            if (force === undefined) {
                force = false;
            }
            group.show(force);
        },

        showItem: function(item) {
            item.show();
        },

        addItem: function(item) {
            if (!this.isEnabled() || this.isIgnoreItem(item)) {
                this.showItem(item);
                return;
            }

            this.getItemGroup(item).addItem(item);
        },

        getItemGroup: function(item) {
            var groupNodeInfo = item.getGroupNodeInfo(),
                group = this.findGroup(groupNodeInfo.node);

            if (group === null) {
                group = new LazyGroup(groupNodeInfo.node, groupNodeInfo.type);

                group.updatePosition();

                if (this.isIgnoreGroup(group) || this.isVisibleGroup(group)) {
                    this.showGroup(group, true);
                }

                this.groups.push(group);
            }

            return group;
        },

        findGroup: function(node) {
            for (var i = 0; i < this.groups.length; i++) {
                if (this.groups[i].getNode() == node) {
                    return this.groups[i];
                }
            }
            return null;
        },

        isIgnoreItem: function(item) {
            return false;
        },

        isIgnoreGroup: function(group) {
            if (group.getType() == 'gem-slideshow' || group.getType() == 'rev_slider') {
                return true;
            }

            return false;
        },

        addNodes: function(nodes) {
            var self = this;
            nodes.forEach(function(node) {
                self.addNode(node);
            });
        },

        addNode: function(data) {
            if (data.node === null) {
                return;
            }

            this.addItem(new LazyItem(data.node, data.data));
        },

        collectItems: function() {
            var self = this;

            document.querySelectorAll('img[data-tgpli-image-inited]').forEach(function(node) {
                self.addNode(node);
            });

            document.querySelectorAll('.tgpli-background-inited').forEach(function(node) {
                self.addNode(node);
            });
        },

        collectCustomItems: function() {
            var self = this;

            document.querySelectorAll('.tgpli-custom-item').forEach(function(node) {
                self.addNode({
                    node: node,
                    data: {
                        customItem: true
                    }
                });
            });
        },

        updateGroupsPositions: function() {
            this.groups.forEach(function(group) {
                group.updatePosition();
            });
        },

        updateRootScrollTop: function() {
            this.scrollTop = getRootScrollTop();
        },

        updateRootSize: function() {
            this.rootHeight = document.documentElement.clientHeight;
        },

        getRootPosition: function() {
            return {
                top: this.scrollTop,
                bottom: this.scrollTop + this.rootHeight,
                height: this.rootHeight
            };
        },

        checkGroupShowed: function(node, callback) {
            if (this.isGroupShowed(node)) {
                return true;
            } else {
                addEvent(node, 'tgpliVisible', function() {
                    callback(node);
                }, true);
                return false;
            }
        },

        isGroupShowed: function(node) {
            var group = this.findGroup(node);
            return group === null || group.isShowed();
        }
    };

    window.tgpLazyItems = new LazyItems(window.tgpLazyItemsOptions || {});
})(window, document);