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aFarkas
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| (function(window, document){ | ||
| 'use strict'; | ||
|
|
||
| var imageRatio, extend$; | ||
|
|
||
| var regPicture = /^picture$/i; | ||
| var aspectRatioAttr = 'data-aspectratio'; | ||
| var aspectRatioSel = 'img[' + aspectRatioAttr + ']'; | ||
|
|
||
| var matchesMedia = function(media){ | ||
| if(window.matchMedia){ | ||
| matchesMedia = function(media){ | ||
| return !media || (matchMedia(media) || {}).matches; | ||
| }; | ||
| } else if(window.Modernizr && Modernizr.mq){ | ||
| return !media || Modernizr.mq(media); | ||
| } else { | ||
| return !media; | ||
| } | ||
| return matchesMedia(media); | ||
| }; | ||
|
|
||
| function AspectRatio(){ | ||
| this.ratioElems = document.getElementsByClassName('lazyaspectratio'); | ||
| this._setupEvents(); | ||
| this.processImages(); | ||
| } | ||
|
|
||
| AspectRatio.prototype = { | ||
| _setupEvents: function(){ | ||
| var module = this; | ||
|
|
||
| var addRemoveAspectRatio = function(elem){ | ||
| if(elem.naturalWidth < 50){ | ||
| module.addAspectRatio(elem, true); | ||
| } else { | ||
| module.removeAspectRatio(elem, true); | ||
| } | ||
| }; | ||
|
|
||
| document.addEventListener('load', function(e){ | ||
| if(e.target.getAttribute && e.target.getAttribute(aspectRatioAttr)){ | ||
| addRemoveAspectRatio(e.target); | ||
| } | ||
| }, true); | ||
|
|
||
| addEventListener('resize', (function(){ | ||
| var timer; | ||
| var resize = function(){ | ||
| var i, len; | ||
| for(i = 0, len = module.ratioElems.length; i < len; i++){ | ||
| addRemoveAspectRatio(module.ratioElems[i]); | ||
| } | ||
| }; | ||
|
|
||
| return function(e){ | ||
| clearTimeout(timer); | ||
| timer = setTimeout(resize, 33); | ||
| }; | ||
| })()); | ||
|
|
||
| document.addEventListener('DOMContentLoaded', function(){ | ||
| module.processImages(); | ||
| }); | ||
| }, | ||
| processImages: function(context){ | ||
| var elements, i; | ||
|
|
||
| if(!context){ | ||
| context = document; | ||
| } | ||
|
|
||
| if('length' in context && !context.nodeName){ | ||
| elements = context; | ||
| } else { | ||
| elements = context.querySelectorAll(aspectRatioSel); | ||
| } | ||
|
|
||
| for(i = 0; i < elements.length; i++){ | ||
| if(elements[i].naturalWidth > 50){ | ||
| this.removeAspectRatio(elements[i]); | ||
| continue; | ||
| } | ||
| this.addAspectRatio(elements[i]); | ||
| } | ||
| }, | ||
| getSelectedRatio: function(img){ | ||
| var i, len, sources, customMedia, ratio; | ||
| var parent = img.parentNode; | ||
| if(parent && regPicture.test(parent.nodeName || '')){ | ||
| sources = parent.getElementsByTagName('source'); | ||
|
|
||
| for(i = 0, len = sources.length; i < len; i++){ | ||
| customMedia = sources[i].getAttribute('data-media') || sources[i].getAttribute('media'); | ||
|
|
||
| if(lazySizesConfig.customMedia[customMedia]){ | ||
| customMedia = lazySizesConfig.customMedia[customMedia]; | ||
| } | ||
|
|
||
| if(matchesMedia(customMedia)){ | ||
| ratio = sources[i].getAttribute(aspectRatioAttr); | ||
| break; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return ratio || img.getAttribute(aspectRatioAttr) || ''; | ||
| }, | ||
| parseRatio: (function(){ | ||
| var regRatio = /^\s*([+\d\.]+)(\s*[\/x]\s*([+\d\.]+))?\s*$/; | ||
| var ratioCache = {}; | ||
| return function(ratio){ | ||
|
|
||
| if(!ratioCache[ratio] && ratio.match(regRatio)){ | ||
| if(RegExp.$3){ | ||
| ratioCache[ratio] = RegExp.$1 / RegExp.$3; | ||
| } else { | ||
| ratioCache[ratio] = RegExp.$1 * 1; | ||
| } | ||
| } | ||
|
|
||
| return ratioCache[ratio]; | ||
| }; | ||
| })(), | ||
| addAspectRatio: function(img, notNew){ | ||
| var ratio; | ||
| var width = img.offsetWidth; | ||
|
|
||
| if(!notNew){ | ||
| lazySizes.aC(img, 'lazyaspectratio'); | ||
| } | ||
|
|
||
| if(!width){return;} | ||
|
|
||
| ratio = this.getSelectedRatio(img); | ||
| ratio = this.parseRatio(ratio); | ||
|
|
||
| if(ratio){ | ||
| img.style.height = (width / ratio) + 'px'; | ||
| } | ||
| }, | ||
| removeAspectRatio: function(img){ | ||
| lazySizes.rC(img, 'lazyaspectratio'); | ||
| img.style.height = ''; | ||
| img.removeAttribute(aspectRatioAttr); | ||
| } | ||
| }; | ||
|
|
||
| extend$ = function(){ | ||
| var $ = window.jQuery || window.Zepto || window.shoestring; | ||
| if($ && $.fn && !$.fn.imageRatio){ | ||
| $.fn.imageRatio = function(){ | ||
| imageRatio.processImages(this.find(aspectRatioSel).add(this.filter(aspectRatioSel))); | ||
| return this; | ||
| }; | ||
| } | ||
| }; | ||
|
|
||
| extend$(); | ||
| setTimeout(extend$); | ||
|
|
||
| imageRatio = new AspectRatio(); | ||
|
|
||
| window.imageRatio = imageRatio; | ||
|
|
||
| if(typeof module == 'object' && module.exports){ | ||
| module.exports = imageRatio; | ||
| } else if (typeof define == 'function' && define.amd) { | ||
| define(imageRatio); | ||
| } | ||
|
|
||
| })(window, document); |
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