Révision a08833bd
Ajouté par Assos Assos il y a presque 8 ans
| drupal7/sites/all/themes/adaptivetheme/at_core/scripts/matchMedia.addListener.js | ||
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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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// Bail out for browsers that have addListener support |
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if (window.matchMedia && window.matchMedia('all').addListener) {
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return false; |
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} |
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var localMatchMedia = window.matchMedia, |
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hasMediaQueries = localMatchMedia('only all').matches,
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isListening = false, |
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timeoutID = 0, // setTimeout for debouncing 'handleChange' |
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queries = [], // Contains each 'mql' and associated 'listeners' if 'addListener' is used |
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handleChange = function(evt) {
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// Debounce |
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clearTimeout(timeoutID); |
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timeoutID = setTimeout(function() {
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for (var i = 0, il = queries.length; i < il; i++) {
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var mql = queries[i].mql, |
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listeners = queries[i].listeners || [], |
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matches = localMatchMedia(mql.media).matches; |
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// Update mql.matches value and call listeners |
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// Fire listeners only if transitioning to or from matched state |
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if (matches !== mql.matches) {
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mql.matches = matches; |
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for (var j = 0, jl = listeners.length; j < jl; j++) {
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listeners[j].call(window, mql); |
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} |
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} |
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} |
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}, 30); |
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}; |
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window.matchMedia = function(media) {
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var mql = localMatchMedia(media), |
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listeners = [], |
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index = 0; |
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mql.addListener = function(listener) {
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// Changes would not occur to css media type so return now (Affects IE <= 8) |
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if (!hasMediaQueries) {
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return; |
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} |
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// Set up 'resize' listener for browsers that support CSS3 media queries (Not for IE <= 8) |
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// There should only ever be 1 resize listener running for performance |
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if (!isListening) {
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isListening = true; |
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window.addEventListener('resize', handleChange, true);
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} |
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// Push object only if it has not been pushed already |
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if (index === 0) {
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index = queries.push({
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mql : mql, |
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listeners : listeners |
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}); |
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} |
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listeners.push(listener); |
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}; |
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mql.removeListener = function(listener) {
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for (var i = 0, il = listeners.length; i < il; i++){
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if (listeners[i] === listener){
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listeners.splice(i, 1); |
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} |
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} |
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}; |
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return mql; |
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}; |
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}()); |
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