'use strict';

/* --------------------------------------------------------------
 responsive_image_loader.js 2016-03-09
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2015 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

/**
 * Example:
 *
 * <img src="img/testbild4_320.jpg" title="Testbild" alt="Testbild" data-image-xs="img/testbild4_320.jpg"
 *      data-image-sm="img/testbild4_640.jpg" data-image-md="img/testbild4_1024.jpg"
 *      data-image-lg="img/testbild4_1600.jpg"/>
 */
gambio.widgets.module('responsive_image_loader', [gambio.source + '/libs/events', gambio.source + '/libs/responsive'], function (data) {

    'use strict';

    // ########## VARIABLE INITIALIZATION ##########

    var $this = $(this),
        defaults = {
        breakpoints: ['xs', 'sm', 'md', 'lg']
    },
        options = $.extend(true, {}, defaults, data),
        module = {};

    // ######### HELPER FUNCTIONS ##########

    /**
     * Helper function that registers the ":attr"
     * selector to jQuery. With this one it's possible
     * to select elements with an regular expression
     * @private
     */
    var _registerSelector = function _registerSelector() {
        if ($.expr.pseudos.attr === undefined) {
            $.expr.pseudos.attr = $.expr.createPseudo(function (arg) {
                var regexp = new RegExp(arg);
                return function (elem) {
                    for (var i = 0; i < elem.attributes.length; i++) {
                        var attr = elem.attributes[i];
                        if (regexp.test(attr.name)) {
                            return true;
                        }
                    }
                    return false;
                };
            });
        }
    };

    // ########## MAIN FUNCTIONALITY ##########

    /**
     * Function that searches for the best fitting image
     * for the parent container, so that it can set the src-attribute
     * inside the img-tag
     * @param       {object}    $target     jQuery selection that contains the image to set (optional)
     * @private
     */
    var _resizeImages = function _resizeImages($target) {
        var $self = $(this),
            breakpoint = jse.libs.theme.responsive.breakpoint(),
            $elements = $target && $target.length ? $target : $self.filter(':attr(^data-image)').add($self.find(':attr(^data-image)'));

        // Iterate trough every image element
        // and check if there is a new image
        // size to set
        $elements.not('.lazyLoading').each(function () {

            var $element = $(this),
                breakpoint = jse.libs.theme.responsive.breakpoint(),
                bp = options.breakpoints.indexOf(breakpoint.name),
                bpCount = options.breakpoints.length,
                img = null;

            for (bp; bp < bpCount; bp += 1) {
                var attrName = 'data-image-' + options.breakpoints[bp],
                    value = $element.attr(attrName);

                if (value) {
                    img = value;
                    break;
                }
            }

            if (!img) {
                img = $element.attr('data-image');
            }

            // If an image was found and the target element has a
            // different value inside it's src-attribute set the
            // new value
            if (img && $element.attr('src') !== img) {
                $element.attr('src', img);
            }
        });
    };

    /**
     * Function that initializes the lazy loading
     * capability of images
     * @private
     */
    var _registerLazyLoading = function _registerLazyLoading() {
        var $elements = $this.filter('.lazyLoading:attr(^data-image)').add($this.find('.lazyLoading:attr(^data-image)'));

        /**
         * Function that scans the given elements for images
         * that are in the viewport and set the source attribute
         * @private
         */
        var _lazyLoadingScrollHandler = function _lazyLoadingScrollHandler() {

            var windowWidth = $(window).width(),
                windowHeight = $(window).height(),
                top = $(window).scrollTop(),
                left = $(window).scrollLeft();

            $elements.each(function () {
                var $self = $(this),
                    offset = $self.offset();

                if (offset.top < top + windowHeight || offset.left < left + windowWidth) {
                    $elements = $elements.not($self);
                    $self.trigger('lazyLoadImage');
                }
            });
        };

        /**
         * Removes the class "lazyLoading" from the image
         * so that the "_resizeImages" is able to select it
         * Afterwards execute this function to set the
         * correct image source
         * @param       {object}    e       jQuery event object
         * @private
         */
        var _loadImage = function _loadImage(e) {
            e.stopPropagation();

            var $self = $(this);
            $self.removeClass('lazyLoading');
            _resizeImages($self);
        };

        // Add an event handler for loading the first real image
        // to every image element that is only executed once
        $elements.each(function () {
            $(this).one('lazyLoadImage', _loadImage);
        });

        // Add event handler to every event that changes the dimension / viewport
        $(window).on('scroll windowWasResized', _lazyLoadingScrollHandler);

        // Load images that are in view on load
        _lazyLoadingScrollHandler();
    };

    // ########## INITIALIZATION ##########

    /**
     * Init function of the widget
     * @constructor
     */
    module.init = function (done) {

        _registerSelector();
        _registerLazyLoading();

        $(window).on(jse.libs.theme.events.BREAKPOINT(), function () {
            _resizeImages.call($this);
        });

        _resizeImages.call($this);

        done();
    };

    // Return data to widget engine
    return module;
});
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--------------------------------------------------------------\n responsive_image_loader.js 2016-03-09\n Gambio GmbH\n http://www.gambio.de\n Copyright (c) 2015 Gambio GmbH\n Released under the GNU General Public License (Version 2)\n [http://www.gnu.org/licenses/gpl-2.0.html]\n --------------------------------------------------------------\n */\n\n/**\n * Example:\n *\n * <img src=\"img/testbild4_320.jpg\" title=\"Testbild\" alt=\"Testbild\" data-image-xs=\"img/testbild4_320.jpg\"\n *      data-image-sm=\"img/testbild4_640.jpg\" data-image-md=\"img/testbild4_1024.jpg\"\n *      data-image-lg=\"img/testbild4_1600.jpg\"/>\n */\ngambio.widgets.module(\n    'responsive_image_loader',\n\n    [\n        gambio.source + '/libs/events',\n        gambio.source + '/libs/responsive'\n    ],\n\n    function (data) {\n\n        'use strict';\n\n// ########## VARIABLE INITIALIZATION ##########\n\n        var $this = $(this),\n            defaults = {\n                breakpoints: ['xs', 'sm', 'md', 'lg']\n            },\n            options = $.extend(true, {}, defaults, data),\n            module = {};\n\n// ######### HELPER FUNCTIONS ##########\n\n        /**\n         * Helper function that registers the \":attr\"\n         * selector to jQuery. With this one it's possible\n         * to select elements with an regular expression\n         * @private\n         */\n        var _registerSelector = function () {\n            if ($.expr.pseudos.attr === undefined) {\n                $.expr.pseudos.attr = $.expr.createPseudo(function (arg) {\n                    var regexp = new RegExp(arg);\n                    return function (elem) {\n                        for (var i = 0; i < elem.attributes.length; i++) {\n                            var attr = elem.attributes[i];\n                            if (regexp.test(attr.name)) {\n                                return true;\n                            }\n                        }\n                        return false;\n                    };\n                });\n            }\n        };\n\n\n// ########## MAIN FUNCTIONALITY ##########\n\n        /**\n         * Function that searches for the best fitting image\n         * for the parent container, so that it can set the src-attribute\n         * inside the img-tag\n         * @param       {object}    $target     jQuery selection that contains the image to set (optional)\n         * @private\n         */\n        var _resizeImages = function ($target) {\n            var $self = $(this),\n                breakpoint = jse.libs.theme.responsive.breakpoint(),\n                $elements = ($target && $target.length) ? $target : $self\n                    .filter(':attr(^data-image)')\n                    .add($self.find(':attr(^data-image)'));\n\n            // Iterate trough every image element\n            // and check if there is a new image\n            // size to set\n            $elements\n                .not('.lazyLoading')\n                .each(function () {\n\n                    var $element = $(this),\n                        breakpoint = jse.libs.theme.responsive.breakpoint(),\n                        bp = options.breakpoints.indexOf(breakpoint.name),\n                        bpCount = options.breakpoints.length,\n                        img = null;\n\n                    for (bp; bp < bpCount; bp += 1) {\n                        var attrName = 'data-image-' + options.breakpoints[bp],\n                            value = $element.attr(attrName);\n\n                        if (value) {\n                            img = value;\n                            break;\n                        }\n                    }\n\n                    if (!img) {\n                        img = $element.attr('data-image');\n                    }\n\n                    // If an image was found and the target element has a\n                    // different value inside it's src-attribute set the\n                    // new value\n                    if (img && $element.attr('src') !== img) {\n                        $element.attr('src', img);\n                    }\n                });\n        };\n\n\n        /**\n         * Function that initializes the lazy loading\n         * capability of images\n         * @private\n         */\n        var _registerLazyLoading = function () {\n            var $elements = $this\n                .filter('.lazyLoading:attr(^data-image)')\n                .add($this.find('.lazyLoading:attr(^data-image)'));\n\n            /**\n             * Function that scans the given elements for images\n             * that are in the viewport and set the source attribute\n             * @private\n             */\n            var _lazyLoadingScrollHandler = function () {\n\n                var windowWidth = $(window).width(),\n                    windowHeight = $(window).height(),\n                    top = $(window).scrollTop(),\n                    left = $(window).scrollLeft();\n\n                $elements.each(function () {\n                    var $self = $(this),\n                        offset = $self.offset();\n\n                    if (offset.top < (top + windowHeight) || offset.left < (left + windowWidth)) {\n                        $elements = $elements.not($self);\n                        $self.trigger('lazyLoadImage');\n                    }\n                });\n            };\n\n            /**\n             * Removes the class \"lazyLoading\" from the image\n             * so that the \"_resizeImages\" is able to select it\n             * Afterwards execute this function to set the\n             * correct image source\n             * @param       {object}    e       jQuery event object\n             * @private\n             */\n            var _loadImage = function (e) {\n                e.stopPropagation();\n\n                var $self = $(this);\n                $self.removeClass('lazyLoading');\n                _resizeImages($self);\n            };\n\n            // Add an event handler for loading the first real image\n            // to every image element that is only executed once\n            $elements.each(function () {\n                $(this).one('lazyLoadImage', _loadImage);\n            });\n\n            // Add event handler to every event that changes the dimension / viewport\n            $(window).on('scroll windowWasResized', _lazyLoadingScrollHandler);\n\n            // Load images that are in view on load\n            _lazyLoadingScrollHandler();\n        };\n\n\n// ########## INITIALIZATION ##########\n\n        /**\n         * Init function of the widget\n         * @constructor\n         */\n        module.init = function (done) {\n\n            _registerSelector();\n            _registerLazyLoading();\n\n            $(window).on(jse.libs.theme.events.BREAKPOINT(), function () {\n                _resizeImages.call($this);\n            });\n\n            _resizeImages.call($this);\n\n            done();\n        };\n\n        // Return data to widget engine\n        return module;\n    });\n"]}