40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
// 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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var isWindowAvailable = typeof window !== 'undefined'
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isWindowAvailable &&
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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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for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
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window.requestAnimationFrame =
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window[vendors[x] + 'RequestAnimationFrame']
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window.cancelAnimationFrame =
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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() {
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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)
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window.cancelAnimationFrame = function(id) {
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clearTimeout(id)
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}
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})()
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