3 lines
1.5 KiB
JavaScript
3 lines
1.5 KiB
JavaScript
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/*! matchMedia() polyfill - Test a CSS media type/query in JS. Authors & copyright (c) 2012: Scott Jehl, Paul Irish, Nicholas Zakas, David Knight. Dual MIT/BSD license */
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window.matchMedia||(window.matchMedia=function(){"use strict";var a=window.styleMedia||window.media;if(!a){var b=document.createElement("style"),c=document.getElementsByTagName("script")[0],d=null;b.type="text/css",b.id="matchmediajs-test",c.parentNode.insertBefore(b,c),d="getComputedStyle"in window&&window.getComputedStyle(b,null)||b.currentStyle,a={matchMedium:function(a){var c="@media "+a+"{ #matchmediajs-test { width: 1px; } }";return b.styleSheet?b.styleSheet.cssText=c:b.textContent=c,"1px"===d.width}}}return function(b){return{matches:a.matchMedium(b||"all"),media:b||"all"}}}()),/*! matchMedia() polyfill addListener/removeListener extension. Author & copyright (c) 2012: Scott Jehl. Dual MIT/BSD license */
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function(){if(window.matchMedia&&window.matchMedia("all").addListener)return!1;var a=window.matchMedia,b=a("only all").matches,c=!1,d=0,e=[],f=function(){clearTimeout(d),d=setTimeout(function(){for(var b=0,c=e.length;c>b;b++){var d=e[b].mql,f=e[b].listeners||[],g=a(d.media).matches;if(g!==d.matches){d.matches=g;for(var h=0,i=f.length;i>h;h++)f[h].call(window,d)}}},30)};window.matchMedia=function(d){var g=a(d),h=[],i=0;return g.addListener=function(a){b&&(c||(c=!0,window.addEventListener("resize",f,!0)),0===i&&(i=e.push({mql:g,listeners:h})),h.push(a))},g.removeListener=function(a){for(var b=0,c=h.length;c>b;b++)h[b]===a&&h.splice(b,1)},g}}(),webshim.isReady("matchMedia",!0);
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