var $_ = function (id) {
	return "string" == typeof id ? document.getElementById(id) : id;
};

var Class = {
  create: function() {
	return function() {
	  this.initialize.apply(this, arguments);
	}
  }
}

Object.extend = function(destination, source) {
	for (var property in source) {
		destination[property] = source[property];
	}
	return destination;
}

var TransformView = Class.create();
TransformView.prototype = {
  //,,л,л
  initialize: function(container, slider, parameter, count, options) {
	if(parameter <= 0 || count <= 0) return;
	var oContainer = $_(container), oSlider = $_(slider), oThis = this;

	this.Index = 0;//ǰ
	
	this._timer = null;//ʱ
	this._slider = oSlider;//
	this._parameter = parameter;//л
	this._count = count || 0;//л
	this._target = 0;//Ŀ
	
	this.SetOptions(options);
	
	this.Up = !!this.options.Up;
	this.Step = Math.abs(this.options.Step);
	this.Time = Math.abs(this.options.Time);
	this.Auto = !!this.options.Auto;
	this.Pause = Math.abs(this.options.Pause);
	this.onStart = this.options.onStart;
	this.onFinish = this.options.onFinish;
	
	oContainer.style.overflow = "hidden";
	oContainer.style.position = "relative";
	
	oSlider.style.position = "absolute";
	oSlider.style.top = oSlider.style.left = 0;
  },
  //Ĭ
  SetOptions: function(options) {
	this.options = {//Ĭֵ
		Up:			true,//Ƿ()
		Step:		5,//仯
		Time:		10,//ʱ
		Auto:		true,//ǷԶת
		Pause:		2000,//ͣʱ(AutoΪtrueʱЧ)
		onStart:	function(){},//ʼתʱִ
		onFinish:	function(){}//תʱִ
	};
	Object.extend(this.options, options || {});
  },
  //ʼл
  Start: function() {
	if(this.Index < 0){
		this.Index = this._count - 1;
	} else if (this.Index >= this._count){ this.Index = 0; }
	
	this._target = -1 * this._parameter * this.Index;
	this.onStart();
	this.Move();
  },
  //ƶ
  Move: function() {
	clearTimeout(this._timer);
	var oThis = this, style = this.Up ? "top" : "left", iNow = parseInt(this._slider.style[style]) || 0, iStep = this.GetStep(this._target, iNow);
	
	if (iStep != 0) {
		this._slider.style[style] = (iNow + iStep) + "px";
		this._timer = setTimeout(function(){ oThis.Move(); }, this.Time);
	} else {
		this._slider.style[style] = this._target + "px";
		this.onFinish();
		if (this.Auto) { this._timer = setTimeout(function(){ oThis.Index++; oThis.Start(); }, this.Pause); }
	}
  },
  //ȡ
  GetStep: function(iTarget, iNow) {
	var iStep = (iTarget - iNow) / this.Step;
	if (iStep == 0) return 0;
	if (Math.abs(iStep) < 1) return (iStep > 0 ? 1 : -1);
	return iStep;
  },
  //ֹͣ
  Stop: function(iTarget, iNow) {
	clearTimeout(this._timer);
	this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
  }
};

//window.onload=function(){
//	function Each(list, fun){
//		for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
//	};
//	
//	var objs = $_("idNum").getElementsByTagName("li");
//	
//	var tv = new TransformView("idTransformView", "idSlider", 221, 3, {
//		onStart : function(){ Each(objs, function(o, i){ o.className = tv.Index == i ? "on" : ""; }) }
//	});
//	
//	tv.Start();
//	
//	Each(objs, function(o, i){
//		o.onmouseover = function(){
//			o.className = "on";
//			tv.Auto = false;
//			tv.Index = i;
//			tv.Start();
//		}
//		o.onmouseout = function(){
//			o.className = "";
//			tv.Auto = true;
//			tv.Start();
//		}
//	})
//	
//	//暂停图片
//	    var canvas = $_("idSlider").getElementsByTagName("li");
//	    Each(canvas,function(o,i){
//		o.onmouseover = function(){
//			o.className = "on";
//			tv.Auto = false;
//			tv.Index = i;
//			tv.Start();
//			}
//		o.onmouseout = function(){
//			o.className = "";
//			tv.Auto = true;
//			tv.Start();
//		}
//		})
	
	////////////////////////test2
	
	//var objs2 = $_("idNum2").getElementsByTagName("li");
	
	//var tv2 = new TransformView("idTransformView2", "idSlider2", 408, 3, {
		//onStart: function(){ Each(objs2, function(o, i){ o.className = tv2.Index == i ? "on" : ""; }) },//ťʽ
		//Up: false
	//});
	
	//tv2.Start();
	
	//Each(objs2, function(o, i){
		//o.onmouseover = function(){
		//	o.className = "on";
			//tv2.Auto = false;
		//	tv2.Index = i;
		//	tv2.Start();
		//}
		//o.onmouseout = function(){
		//	o.className = "";
		//	tv2.Auto = true;
		//	tv2.Start();
	//	}
//	})
	
	//$_("idStop").onclick = function(){ tv2.Auto = false; tv2.Stop(); }
	//$_("idStart").onclick = function(){ tv2.Auto = true; tv2.Start(); }
	//$_("idNext").onclick = function(){ tv2.Index++; tv2.Start(); }
	//$_("idPre").onclick = function(){ tv2.Index--;tv2.Start(); }
	//$_("idFast").onclick = function(){ if(--tv2.Step <= 0){tv2.Step = 1;} }
//	$_("idSlow").onclick = function(){ if(++tv2.Step >= 10){tv2.Step = 10;} }
	//$_("idReduce").onclick = function(){ tv2.Pause-=1000; if(tv2.Pause <= 0){tv2.Pause = 0;} }
	//$_("idAdd").onclick = function(){ tv2.Pause+=1000; if(tv2.Pause >= 5000){tv2.Pause = 5000;} }
	
	//$_("idReset").onclick = function(){
		//tv2.Step = Math.abs(tv2.options.Step);
	//	tv2.Time = Math.abs(tv2.options.Time);
	//	tv2.Auto = !!tv2.options.Auto;
	//	tv2.Pause = Math.abs(tv2.options.Pause);
	//}
	
//}