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global angular */\nangular.module('afkl.lazyImage', []);\n/* global angular */\nangular.module('afkl.lazyImage')\n    .service('afklSrcSetService', ['$window', function($window) {\n        'use strict';\n\n        /**\n         * For other applications wanting the srccset/best image approach it is possible to use this module only\n         * Loosely based on https://raw.github.com/borismus/srcset-polyfill/master/js/srcset-info.js\n         */\n        var INT_REGEXP = /^[0-9]+$/;\n\n        // SRCSET IMG OBJECT\n        function ImageInfo(options) {\n            this.src = options.src;\n            this.w = options.w || Infinity;\n            this.h = options.h || Infinity;\n            this.x = options.x || 1;\n        }\n\n        /**\n         * Parse srcset rules\n         * @param  {string} descString Containing all srcset rules\n         * @return {object}            Srcset rules\n         */\n        var _parseDescriptors = function (descString) {\n\n            var descriptors = descString.split(/\\s/);\n            var out = {};\n\n            for (var i = 0, l = descriptors.length; i < l; i++) {\n\n                var desc = descriptors[i];\n\n                if (desc.length > 0) {\n\n                    var lastChar = desc.slice(-1);\n                    var value = desc.substring(0, desc.length - 1);\n                    var intVal = parseInt(value, 10);\n                    var floatVal = parseFloat(value);\n\n                    if (value.match(INT_REGEXP) && lastChar === 'w') {\n                        out[lastChar] = intVal;\n                    } else if (value.match(INT_REGEXP) && lastChar === 'h') {\n                        out[lastChar] = intVal;\n                    } else if (!isNaN(floatVal) && lastChar === 'x') {\n                        out[lastChar] = floatVal;\n                    }\n\n                }\n            }\n\n            return out;\n\n        };\n\n        /**\n         * Returns best candidate under given circumstances\n         * @param  {object} images     Candidate image\n         * @param  {function} criteriaFn Rule\n         * @return {object}            Returns best candidate under given criteria\n         */\n        var _getBestCandidateIf = function (images, criteriaFn) {\n\n            var bestCandidate = images[0];\n\n            for (var i = 0, l = images.length; i < l; i++) {\n                var candidate = images[i];\n                if (criteriaFn(candidate, bestCandidate)) {\n                    bestCandidate = candidate;\n                }\n            }\n\n            return bestCandidate;\n\n        };\n\n        /**\n         * Remove candidate under given circumstances\n         * @param  {object} images     Candidate image\n         * @param  {function} criteriaFn Rule\n         * @return {object}            Removes images from global image collection (candidates)\n         */\n        var _removeCandidatesIf = function (images, criteriaFn) {\n\n            for (var i = images.length - 1; i >= 0; i--) {\n                var candidate = images[i];\n                if (criteriaFn(candidate)) {\n                    images.splice(i, 1); // remove it\n                }\n            }\n\n            return images;\n\n        };\n\n        /**\n        * Direct implementation of \"processing the image candidates\":\n        * http://www.whatwg.org/specs/web-apps/current-work/multipage/embedded-content-1.html#processing-the-image-candidates\n        *\n        * @param  {array} imageCandidates (required)\n        * @param  {object} view (optional)\n        * @returns {ImageInfo} The best image of the possible candidates.\n        */\n        var getBestImage = function (imageCandidates, view) {\n\n            if (!imageCandidates) { return; }\n            if (!view) {\n                view = {\n                    'w' : $window.innerWidth || document.documentElement.clientWidth,\n                    'h' : $window.innerHeight || document.documentElement.clientHeight,\n                    'x' : $window.devicePixelRatio || 1\n                };\n            }\n\n            var images = imageCandidates.slice(0);\n\n            /* LARGEST */\n            // Width\n            var largestWidth = _getBestCandidateIf(images, function (a, b) { return a.w > b.w; });\n            // Less than client width.\n            _removeCandidatesIf(images, (function () { return function (a) { return a.w < view.w; }; })(this));\n            // If none are left, keep the one with largest width.\n            if (images.length === 0) { images = [largestWidth]; }\n\n\n            // Height\n            var largestHeight = _getBestCandidateIf(images, function (a, b) { return a.h > b.h; });\n            // Less than client height.\n            _removeCandidatesIf(images, (function () { return function (a) { return a.h < view.h; }; })(this));\n            // If none are left, keep one with largest height.\n            if (images.length === 0) { images = [largestHeight]; }\n\n            // Pixel density.\n            var largestPxDensity = _getBestCandidateIf(images, function (a, b) { return a.x > b.x; });\n            // Remove all candidates with pxdensity less than client pxdensity.\n            _removeCandidatesIf(images, (function () { return function (a) { return a.x < view.x; }; })(this));\n            // If none are left, keep one with largest pixel density.\n            if (images.length === 0) { images = [largestPxDensity]; }\n\n\n            /* SMALLEST */\n            // Width\n            var smallestWidth = _getBestCandidateIf(images, function (a, b) { return a.w < b.w; });\n            // Remove all candidates with width greater than it.\n            _removeCandidatesIf(images, function (a) { return a.w > smallestWidth.w; });\n\n            // Height\n            var smallestHeight = _getBestCandidateIf(images, function (a, b) { return a.h < b.h; });\n            // Remove all candidates with height greater than it.\n            _removeCandidatesIf(images, function (a) { return a.h > smallestHeight.h; });\n\n            // Pixel density\n            var smallestPxDensity = _getBestCandidateIf(images, function (a, b) { return a.x < b.x; });\n            // Remove all candidates with pixel density less than smallest px density.\n            _removeCandidatesIf(images, function (a) { return a.x > smallestPxDensity.x; });\n\n            return images[0];\n\n        };\n\n\n\n        // options {src: null/string, srcset: string}\n        // options.src    normal url or null\n        // options.srcset 997-s.jpg 480w, 997-m.jpg 768w, 997-xl.jpg 1x\n        var getSrcset = function (options) {\n\n            var imageCandidates = [];\n\n            var srcValue = options.src;\n            var srcsetValue = options.srcset;\n\n            if (!srcsetValue) { return; }\n\n            /* PUSH CANDIDATE [{src: _, x: _, w: _, h:_}, ...] */\n            var _addCandidate = function (img) {\n\n                for (var j = 0, ln = imageCandidates.length; j < ln; j++) {\n                    var existingCandidate = imageCandidates[j];\n\n                    // DUPLICATE\n                    if (existingCandidate.x === img.x &&\n                        existingCandidate.w === img.w &&\n                        existingCandidate.h === img.h) { return; }\n                }\n\n                imageCandidates.push(img);\n\n            };\n\n\n            var _parse = function () {\n\n                var input = srcsetValue,\n                position = 0,\n                rawCandidates = [],\n                url,\n                descriptors;\n\n                while (input !== '') {\n\n                    while (input.charAt(0) === ' ') {\n                        input = input.slice(1);\n                    }\n\n                    position = input.indexOf(' ');\n\n                    if (position !== -1) {\n\n                        url = input.slice(0, position);\n\n                        // if (url === '') { break; }\n\n                        input = input.slice(position + 1);\n\n                        position = input.indexOf(',');\n\n                        if (position === -1) {\n                            descriptors = input;\n                            input = '';\n                        } else {\n                            descriptors =  input.slice(0, position);\n                            input = input.slice(position + 1);\n                        }\n\n                        rawCandidates.push({\n                            url: url,\n                            descriptors: descriptors\n                        });\n\n                    } else {\n\n                        rawCandidates.push({\n                            url: input,\n                            descriptors: ''\n                        });\n                        input = '';\n                    }\n\n                }\n\n                // FROM RAW CANDIDATES PUSH IMAGES TO COMPLETE SET\n                for (var i = 0, l = rawCandidates.length; i < l; i++) {\n\n                    var candidate = rawCandidates[i],\n                    desc = _parseDescriptors(candidate.descriptors);\n\n                    _addCandidate(new ImageInfo({\n                        src: candidate.url,\n                        x: desc.x,\n                        w: desc.w,\n                        h: desc.h\n                    }));\n\n                }\n\n                if (srcValue) {\n                    _addCandidate(new ImageInfo({src: srcValue}));\n                }\n\n            };\n\n            _parse();\n\n\n            // Return best available image for current view based on our list of candidates\n            var bestImage = getBestImage(imageCandidates);\n\n            /**\n             * Object returning best match at moment, and total collection of candidates (so 'image' API can be used by consumer)\n             * @type {Object}\n             */\n            var object = {\n                'best': bestImage,              // IMAGE INFORMATION WHICH FITS BEST WHEN API IS REQUESTED\n                'candidates': imageCandidates   // ALL IMAGE CANDIDATES BY GIVEN SRCSET ATTRIBUTES\n            };\n\n            // empty collection\n            imageCandidates = null;\n\n            // pass best match and candidates\n            return object;\n\n        };\n\n        // throttle function to be used in directive\n        function throttle(callback, delay) {\n            var last, deferTimer;\n            return function() {\n                var now = +new Date();\n                if (last && now < last + delay) {\n                    clearTimeout(deferTimer);\n                    deferTimer = setTimeout(function () {\n                        last = now;\n                        callback();\n                    }, delay + last - now);\n                } else {\n                    last = now;\n                    callback();\n                }\n            };\n        }\n\n        /**\n         * PUBLIC API\n         */\n        return {\n            get: getSrcset,        // RETURNS BEST IMAGE AND IMAGE CANDIDATES\n            image: getBestImage,   // RETURNS BEST IMAGE WITH GIVEN CANDIDATES\n            throttle: throttle     // RETURNS A THROTTLER FUNCTION\n        };\n\n\n    }]);\n\n/* global angular */\nangular.module('afkl.lazyImage')\n    .directive('afklImageContainer', function () {\n        'use strict';\n\n        return {\n            restrict: 'A',\n            // We have to use controller instead of link here so that it will always run earlier than nested afklLazyImage directives\n            controller: ['$scope', '$element', function ($scope, $element) {\n                $element.data('afklImageContainer', $element);\n            }]\n        };\n    })\n    .directive('afklLazyImage', ['$rootScope', '$window', '$timeout', 'afklSrcSetService', '$parse', function ($rootScope, $window, $timeout, srcSetService, $parse) {\n        'use strict';\n\n        // Use srcSetService to find out our best available image\n        var bestImage = function (images) {\n            var image = srcSetService.get({srcset: images});\n            var sourceUrl;\n            if (image) {\n                sourceUrl = image.best.src;\n            }\n            return sourceUrl;\n        };\n\n        return {\n            restrict: 'A',\n            link: function (scope, element, attrs) {\n\n                var _concatImgAttrs = function (imgAttrs) {\n\n                    var result = [];\n                    var CLASSNAME = 'afkl-lazy-image';\n                    var setClass = false;\n\n                    if (!!options.imgAttrs) {\n                        result = Array.prototype.map.call(imgAttrs, function(item) {\n                            for (var key in item) {\n                                if (item.hasOwnProperty(key)) {\n\n                                    // TODO: TITLE CAN COME LATER (FROM DATA MODEL)\n                                    var value = item[key];\n                                    if (key === 'class') {\n                                        setClass = true;\n                                        value = value + ' ' + CLASSNAME;\n                                    }\n                                    return String.prototype.concat.call(key, '=\"', value, '\"');\n                                }\n                            }\n                        });\n                    }\n\n                    if (!setClass) {\n                        result.push('class=\"' + CLASSNAME + '\"');\n                    }\n\n                    return result.join(' ');\n                };\n\n                // CONFIGURATION VARS\n                var $container = element.inheritedData('afklImageContainer');\n                if (!$container) {\n                    $container = angular.element(attrs.afklLazyImageContainer || $window);\n                }\n\n                var loaded = false;\n                var timeout;\n\n                var images = attrs.afklLazyImage; // srcset attributes\n                var options = attrs.afklLazyImageOptions ? $parse(attrs.afklLazyImageOptions)(scope) : {}; // options (background, offset)\n\n                var img = null; // Angular element to image which will be placed\n                var currentImage = null; // current image url\n                var offset = options.offset ? options.offset : 50; // default offset\n                var imgAttrs = _concatImgAttrs(options.imgAttrs); // all image attributes like class, title, onerror\n\n                var LOADING = 'afkl-lazy-image-loading';\n\n                attrs.afklLazyImageLoaded = false;\n\n                var _containerScrollTop = function () {\n                    // See if we can use jQuery, with extra check\n                    // TODO: check if number is returned\n                    if ($container.scrollTop) {\n                        var scrollTopPosition = $container.scrollTop();\n                        if (scrollTopPosition) {\n                            return scrollTopPosition;\n                        }\n                    }\n\n                    var c = $container[0];\n                    if (c.pageYOffset !== undefined) {\n                        return c.pageYOffset;\n                    }\n                    else if (c.scrollTop !== undefined) {\n                        return c.scrollTop;\n                    }\n\n                    return document.documentElement.scrollTop || 0;\n                };\n\n                var _containerInnerHeight = function () {\n                    if ($container.innerHeight) {\n                        return $container.innerHeight();\n                    }\n\n                    var c = $container[0];\n                    if (c.innerHeight !== undefined) {\n                        return c.innerHeight;\n                    } else if (c.clientHeight !== undefined) {\n                        return c.clientHeight;\n                    }\n\n                    return document.documentElement.clientHeight || 0;\n                };\n\n                // Begin with offset and update on resize\n                var _elementOffset = function () {\n                    if (element.offset) {\n                        return element.offset().top;\n                    }\n                    var box = element[0].getBoundingClientRect();\n                    return box.top + _containerScrollTop() - document.documentElement.clientTop;\n                };\n\n\n                var _elementOffsetContainer = function () {\n                    if (element.offset) {\n                        return element.offset().top - $container.offset().top;\n                    }\n                    return element[0].getBoundingClientRect().top - $container[0].getBoundingClientRect().top;\n                };\n\n                // Update url of our image\n                var _setImage = function () {\n                    if (options.background) {\n                        element[0].style.backgroundImage = 'url(\"' + currentImage +'\")';\n                    } else if (!!img) {\n                        img[0].src = currentImage;\n                    }\n                };\n\n                // Append image to DOM\n                var _placeImage = function () {\n\n                    loaded = true;\n                    // What is my best image available\n                    var hasImage = bestImage(images);\n\n                    if (hasImage) {\n                        // we have to make an image if background is false (default)\n                        if (!options.background) {\n\n                            if (!img) {\n                                element.addClass(LOADING);\n                                img = angular.element('<img ' + imgAttrs + ' />');\n                                img.one('load', _loaded);\n                                img.one('error', _error);\n                                // remove loading class when image is acually loaded\n                                element.append(img);\n                            }\n\n                        }\n\n                        // set correct src/url\n                        _checkIfNewImage();\n                    }\n\n                    // Element is added to dom, no need to listen to scroll anymore\n                    $container.off('scroll', _onViewChange);\n\n                };\n\n                // Check on resize if actually a new image is best fit, if so then apply it\n                var _checkIfNewImage = function () {\n                    if (loaded) {\n                        var newImage = bestImage(images);\n                        \n                        if (newImage !== currentImage) {\n                            // update current url\n                            currentImage = newImage;\n\n                            // TODO: loading state...\n\n                            // update image url\n                            _setImage();\n                        }\n                    }\n                };\n\n                // First update our begin offset\n                _checkIfNewImage();\n\n                var _loaded = function () {\n\n                    attrs.$set('afklLazyImageLoaded', 'done');\n\n                    element.removeClass(LOADING);\n\n                };\n\n                var _error = function () {\n\n                    attrs.$set('afklLazyImageLoaded', 'fail');\n\n                };\n\n                // Check if the container is in view for the first time. Utilized by the scroll and resize events.\n                var _onViewChange = function () {\n                    // only do stuff when not set already\n                    if (!loaded) {\n\n                        // Config vars\n                        var remaining, shouldLoad, windowBottom;\n\n                        var height = _containerInnerHeight();\n                        var scroll = _containerScrollTop();\n\n                        var elOffset = $container[0] === $window ? _elementOffset() : _elementOffsetContainer();\n                        windowBottom = $container[0] === $window ? height + scroll : height;\n\n                        remaining = elOffset - windowBottom;\n\n                        // Is our top of our image container in bottom of our viewport?\n                        //console.log($container[0].className, _elementOffset(), _elementPosition(), height, scroll, remaining, elOffset);\n                        shouldLoad = remaining <= offset;\n\n\n                        // Append image first time when it comes into our view, after that only resizing can have influence\n                        if (shouldLoad) {\n\n                            _placeImage();\n\n                        }\n\n                    }\n\n                };\n\n                var _onViewChangeThrottled = srcSetService.throttle(_onViewChange, 300);\n\n                // EVENT: RESIZE THROTTLED\n                var _onResize = function () {\n                    $timeout.cancel(timeout);\n                    timeout = $timeout(function() {\n                        _checkIfNewImage();\n                        _onViewChange();\n                    }, 300);\n                };\n\n\n                // Remove events for total destroy\n                var _eventsOff = function() {\n\n                    $timeout.cancel(timeout);\n\n                    angular.element($window).off('resize', _onResize);\n                    angular.element($window).off('scroll', _onViewChangeThrottled);\n\n                    if ($container[0] !== $window) {\n                        $container.off('resize', _onResize);\n                        $container.off('scroll', _onViewChangeThrottled);\n                    }\n\n                    // remove image being placed\n                    if (img) {\n                        img.remove();\n                    }\n\n                    img = timeout = currentImage = undefined;\n                };\n\n                // set events for scrolling and resizing on window\n                // even if container is not window it is important\n                // to cover two cases:\n                //  - when container size is bigger than window's size\n                //  - when container's side is out of initial window border\n                angular.element($window).on('resize', _onResize);\n                angular.element($window).on('scroll', _onViewChangeThrottled);\n\n                // if container is not window, set events for container as well\n                if ($container[0] !== $window) {\n                    $container.on('resize', _onResize);\n                    $container.on('scroll', _onViewChangeThrottled);\n                }\n\n                // events for image change\n                attrs.$observe('afklLazyImage', function () {\n                    images = attrs.afklLazyImage;\n                    if (loaded) {\n                        _placeImage();\n                    }\n                });\n\n                // Image should be directly placed\n                if (options.nolazy) {\n                    _placeImage();\n                }\n\n\n                scope.$on('afkl.lazyImage.destroyed', _onResize);\n\n                // Remove all events when destroy takes place\n                scope.$on('$destroy', function () {\n                    // tell our other kids, i got removed\n                    $rootScope.$broadcast('afkl.lazyImage.destroyed');\n                    // remove our events and image\n                    return _eventsOff();\n                });\n\n                return _onViewChange();\n\n            }\n        };\n\n}]);\n"],"names":["angular","module","service","$window","INT_REGEXP","ImageInfo","options","this","src","w","Infinity","h","x","_parseDescriptors","descString","descriptors","split","out","i","l","length","desc","lastChar","slice","value","substring","intVal","parseInt","floatVal","parseFloat","match","isNaN","_getBestCandidateIf","images","criteriaFn","bestCandidate","candidate","_removeCandidatesIf","splice","getBestImage","imageCandidates","view","innerWidth","document","documentElement","clientWidth","innerHeight","clientHeight","devicePixelRatio","largestWidth","a","b","largestHeight","largestPxDensity","smallestWidth","smallestHeight","smallestPxDensity","get","srcValue","srcsetValue","srcset","_addCandidate","img","j","ln","existingCandidate","push","url","input","position","rawCandidates","charAt","indexOf","_parse","object","image","throttle","callback","delay","last","deferTimer","now","Date","clearTimeout","setTimeout","directive","restrict","controller","$scope","$element","data","$rootScope","$timeout","srcSetService","$parse","bestImage","sourceUrl","best","link","scope","element","attrs","$container","inheritedData","afklLazyImageContainer","timeout","loaded","afklLazyImage","afklLazyImageOptions","currentImage","offset","imgAttrs","result","CLASSNAME","setClass","Array","prototype","map","call","item","key","hasOwnProperty","String","concat","join","_concatImgAttrs","LOADING","afklLazyImageLoaded","_containerScrollTop","scrollTop","scrollTopPosition","c","undefined","pageYOffset","_placeImage","background","addClass","one","_loaded","_error","append","_checkIfNewImage","off","_onViewChange","newImage","style","backgroundImage","$set","removeClass","height","_containerInnerHeight","scroll","top","getBoundingClientRect","clientTop","_onViewChangeThrottled","_onResize","cancel","on","$observe","nolazy","$on","$broadcast","remove"],"sourceRoot":""}