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27 lines
1.3 KiB
27 lines
1.3 KiB
// http://paulirish.com/2011/requestanimationframe-for-smart-animating/ |
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// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating |
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// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel |
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// MIT license |
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;(function() { |
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var lastTime = 0; |
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var vendors = ['ms', 'moz', 'webkit', 'o']; |
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if(typeof window != "undefined"){ |
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for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) { |
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window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame']; |
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window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] |
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|| window[vendors[x]+'CancelRequestAnimationFrame']; |
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} |
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if (!window.requestAnimationFrame) |
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window.requestAnimationFrame = function(callback, element) { |
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var currTime = new Date().getTime(); |
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var timeToCall = Math.max(0, 16 - (currTime - lastTime)); |
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var id = window.setTimeout(function() { callback(currTime + timeToCall); }, |
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timeToCall); |
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lastTime = currTime + timeToCall; |
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return id; |
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}; |
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if (!window.cancelAnimationFrame) window.cancelAnimationFrame = function(id) { clearTimeout(id); }; |
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} |
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}()); |
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