var NOOP = require('../utils/NOOP'); 
var RequestAnimationFrame = function (){ 
this.isRunning = false ; 
this.callback = NOOP; 
this.tick = 0; 
this.isSetTimeOut = false ; 
this.timeOutID = null ; 
var _this = this; 
var step = function (timestamp){ 
_this.tick = timestamp; 
_this.callback(timestamp); 
_this.timeOutID = window.requestAnimationFrame(step); 
} 
; 
var stepTimeout = function (){ 
var d = Date.now(); 
_this.tick = d; 
_this.callback(d); 
_this.timeOutID = _AN_Call_settimeout('setTimeout', window, stepTimeout, _this.timeToCall); 
} 
; 
this.step = step; 
this.stepTimeout = stepTimeout; 
} 
; 
RequestAnimationFrame.prototype.constructor = RequestAnimationFrame; 
RequestAnimationFrame.prototype = { 
start: function (callback, forceSetTimeOut){ 
this.callback = callback; 
this.isSetTimeOut = forceSetTimeOut; 
this.isRunning = true ; 
var _this = this; 
this.timeOutID = (forceSetTimeOut)? _AN_Call_settimeout('setTimeout', window, _this.stepTimeout, 0): window.requestAnimationFrame(_this.step); 
} 
,
stop: function (){ 
this.isRunning = false ; 
if (this.isSetTimeOut) { 
clearTimeout(this.timeOutID); 
} 
 else { 
window.cancelAnimationFrame(this.timeOutID); 
} 
} 
,
destroy: function (){ 
this.stop(); 
this.callback = NOOP; 
} 
}
; 
module.exports = RequestAnimationFrame;