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JCMais/README

Forked from joelambert/README
Created Feb 22, 2012
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Drop in replacements for setTimeout()/setInterval() that makes use of requestAnimationFrame() where possible for better performance
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 clearInterval except uses cancelRequestAnimationFrame() where possible for better performance
* @param {int|object} fn The callback function
*/
window.clearRequestInterval = 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) :
clearInterval(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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