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July 28, 2014 21:53
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Animation snippets with a requestAnimationFrame flare
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// Drop in replace functions for setTimeout() & setInterval() that | |
// make use of requestAnimationFrame() for performance where available | |
// http://www.joelambert.co.uk | |
// Copyright 2011, Joe Lambert. | |
// Free to use under the MIT license. | |
// http://www.opensource.org/licenses/mit-license.php | |
// requestAnimationFrame() shim by Paul Irish | |
// http://paulirish.com/2011/requestanimationframe-for-smart-animating/ | |
window.requestAnimFrame = (function() { | |
return window.requestAnimationFrame || | |
window.webkitRequestAnimationFrame || | |
window.mozRequestAnimationFrame || | |
window.oRequestAnimationFrame || | |
window.msRequestAnimationFrame || | |
function(/* function */ callback, /* DOMElement */ element){ | |
window.setTimeout(callback, 1000 / 60); | |
}; | |
})(); | |
/** | |
* 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 | |
*/ | |
window.requestInterval = function(fn, delay) { | |
if( !window.requestAnimationFrame && | |
!window.webkitRequestAnimationFrame && | |
!(window.mozRequestAnimationFrame && window.mozCancelRequestAnimationFrame) && // Firefox 5 ships without cancel support | |
!window.oRequestAnimationFrame && | |
!window.msRequestAnimationFrame) | |
return window.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 = requestAnimFrame(loop); | |
}; | |
handle.value = requestAnimFrame(loop); | |
return handle; | |
} | |
/** | |
* 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 | |
*/ | |
window.requestTimeout = function(fn, delay) { | |
if( !window.requestAnimationFrame && | |
!window.webkitRequestAnimationFrame && | |
!(window.mozRequestAnimationFrame && window.mozCancelRequestAnimationFrame) && // Firefox 5 ships without cancel support | |
!window.oRequestAnimationFrame && | |
!window.msRequestAnimationFrame) | |
return window.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 = requestAnimFrame(loop); | |
}; | |
handle.value = requestAnimFrame(loop); | |
return handle; | |
}; | |
/** | |
* Behaves the same as clearTimeout except uses cancelRequestAnimationFrame() where possible for better performance | |
* @param {int|object} fn The callback function | |
*/ | |
window.clearRequestTimeout = function(handle) { | |
window.cancelAnimationFrame ? window.cancelAnimationFrame(handle.value) : | |
window.webkitCancelAnimationFrame ? window.webkitCancelAnimationFrame(handle.value) : | |
window.webkitCancelRequestAnimationFrame ? window.webkitCancelRequestAnimationFrame(handle.value) : /* Support for legacy API */ | |
window.mozCancelRequestAnimationFrame ? window.mozCancelRequestAnimationFrame(handle.value) : | |
window.oCancelRequestAnimationFrame ? window.oCancelRequestAnimationFrame(handle.value) : | |
window.msCancelRequestAnimationFrame ? window.msCancelRequestAnimationFrame(handle.value) : | |
clearTimeout(handle); | |
}; |
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