root / drupal7 / sites / all / themes / adaptivetheme / at_core / scripts / matchMedia.addListener.js @ 87dbc3bf
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/*! matchMedia() polyfill addListener/removeListener extension. Author & copyright (c) 2012: Scott Jehl. Dual MIT/BSD license */
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(function(){
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// monkeypatch unsupported addListener/removeListener with polling
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if( !window.matchMedia( "" ).addListener ){ |
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var oldMM = window.matchMedia;
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window.matchMedia = function( q ){ |
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var ret = oldMM( q ),
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listeners = [], |
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last = false,
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timer, |
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check = function(){ |
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var list = oldMM( q ),
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unmatchToMatch = list.matches && !last, |
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matchToUnmatch = !list.matches && last; |
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//fire callbacks only if transitioning to or from matched state
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if( unmatchToMatch || matchToUnmatch ){
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for( var i =0, il = listeners.length; i< il; i++ ){ |
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listeners[ i ].call( ret, list ); |
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} |
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} |
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last = list.matches; |
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}; |
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ret.addListener = function( cb ){ |
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listeners.push( cb ); |
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if( !timer ){
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timer = setInterval( check, 1000 );
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} |
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}; |
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ret.removeListener = function( cb ){ |
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for( var i =0, il = listeners.length; i< il; i++ ){ |
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if( listeners[ i ] === cb ){
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listeners.splice( i, 1 );
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} |
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} |
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if( !listeners.length && timer ){
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clearInterval( timer ); |
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} |
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}; |
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return ret;
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}; |
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} |
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}()); |