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requestAnimationFrame pollyfill
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// http://paulirish.com/2011/requestanimationframe-for-smart-animating/ | |
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating | |
// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel | |
// Ref:https://gist.github.com/mamboer/8179563 | |
(function(W) { | |
var lastTime = 0, | |
vendors = ['ms', 'moz', 'webkit', 'o'], | |
x, | |
length, | |
currTime, | |
timeToCall, | |
requestAnimFrame0 = W['requestAnimationFrame'], | |
cancelAnimFrame0 = W['cancelAnimationFrame']; | |
for(x = 0, length = vendors.length; x < length && !requestAnimFrame0; ++x) { | |
requestAnimFrame0 = W[vendors[x]+'RequestAnimationFrame']; | |
cancelAnimFrame0 = | |
W[vendors[x]+'CancelAnimationFrame'] || W[vendors[x]+'CancelRequestAnimationFrame']; | |
} | |
if (!requestAnimFrame0){ | |
W.requestAnimationFrame = function(callback, element) { | |
currTime = new Date().getTime(); | |
timeToCall = Math.max(0, 16 - (currTime - lastTime)); | |
lastTime = currTime + timeToCall; | |
return W.setTimeout(function() { callback(currTime + timeToCall); }, | |
timeToCall); | |
}; | |
} else { | |
W.requestAnimationFrame = requestAnimFrame0; | |
} | |
if (!cancelAnimFrame0){ | |
W.cancelAnimationFrame = function(id) { | |
W.clearTimeout(id); | |
}; | |
} else { | |
W.cancelAnimationFrame = cancelAnimFrame0; | |
} | |
/** | |
* Behaves the same as setTimeout except uses requestAnimationFrame() where possible for better performance | |
* @param {function} fn The callback function | |
* @param {int} delay The delay in milliseconds | |
*/ | |
W.requestTimeout = function(fn, delay) { | |
if( !requestAnimFrame0) | |
return W.setTimeout(fn, delay); | |
var start = new Date().getTime(), | |
handle = new Object(); | |
function loop(){ | |
var current = new Date().getTime(), | |
delta = current - start; | |
delta >= delay ? fn.call() : handle.value = requestAnimFrame0(loop); | |
}; | |
handle.value = requestAnimFrame0(loop); | |
return handle; | |
}; | |
/** | |
* Behaves the same as clearTimeout except uses cancelRequestAnimationFrame() where possible for better performance | |
* @param {int|object} fn The callback function | |
*/ | |
W.clearRequestTimeout = function(handle) { | |
cancelAnimFrame0?cancelAnimFrame0(handle.value):W.clearTimeout(handle); | |
}; | |
/** | |
* Behaves the same as setInterval except uses requestAnimationFrame() where possible for better performance | |
* @param {function} fn The callback function | |
* @param {int} delay The delay in milliseconds | |
*/ | |
W.requestInterval = function(fn, delay) { | |
if( !requestAnimFrame0 ) | |
return W.setInterval(fn, delay); | |
var start = new Date().getTime(), | |
handle = new Object(); | |
function loop() { | |
var current = new Date().getTime(), | |
delta = current - start; | |
if(delta >= delay) { | |
fn.call(); | |
start = new Date().getTime(); | |
} | |
handle.value = requestAnimFrame0(loop); | |
}; | |
handle.value = requestAnimFrame0(loop); | |
return handle; | |
} | |
/** | |
* Behaves the same as clearInterval except uses cancelRequestAnimationFrame() where possible for better performance | |
* @param {int|object} fn The callback function | |
*/ | |
W.clearRequestInterval = function(handle) { | |
cancelAnimFrame0?cancelAnimFrame0(handle.value):W.clearInterval(handle); | |
}; | |
})(window); |
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