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 = {
//容器对象,滑动对象,切换参数,切换数量
initialize: function(container, slider, parameter, count, options) {
	if(parameter <= 0 || count <= 0) return;
	var oContainer = $(container), oSlider = $(slider), oThis = this;
	
	this.Index = 0;//当前索引
	
	this._timer = null;//定时器
	this._slider = oSlider;//滑动对象
	this._parameter = parameter;//切换参数
	this._count = count || 0;//切换数量
	this._target = 0;//目标参数
	
	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;
},
//设置默认属性
SetOptions: function(options) {
	this.options = {//默认值
	Up: true,//是否向上(否则向左)
	Step: 5,//滑动变化率
	Time: 10,//滑动延时
	Auto: true,//是否自动转换
	Pause: 2000,//停顿时间(Auto为true时有效)
	onStart: function(){},//开始转换时执行
	onFinish: function(){}//完成转换时执行
};
Object.extend(this.options, options || {});
},
//开始切换设置
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();
},
//移动
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); }
}
},
//获取步长
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;
},
//停止
Stop: function(iTarget, iNow) {
clearTimeout(this._timer);
this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
}
};