Created
August 20, 2012 20:39
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requestAnimationFrame polyfill
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/** | |
* Request Animation Frame Polyfill | |
* Authored by Erik Möller | |
* http://my.opera.com/emoller/blog | |
* | |
* Polyfills requestAnimationFrame and cancelAnimationFrame | |
* for ms/mox/webkit/o vendor prefixes. | |
* | |
* Will fallback to setTimeout for non-supportive browsers. | |
*/ | |
(function() { | |
var lastTime = 0; | |
var vendors = ['ms', 'moz', 'webkit', 'o']; | |
for( var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x ) { | |
window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame']; | |
window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame']; | |
} | |
if ( !window.requestAnimationFrame || !window.cancelAnimationFrame ) { | |
window.requestAnimationFrame = function(callback, element) { | |
var currTime = new Date().getTime(); | |
var timeToCall = Math.max(0, 16 - (currTime - lastTime)); | |
var id = window.setTimeout(function() { callback(currTime + timeToCall); }, timeToCall); | |
lastTime = currTime + timeToCall; | |
return id; | |
}; | |
window.cancelAnimationFrame = function(id) { | |
clearTimeout(id); | |
}; | |
} | |
}()); |
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