// JavaScript Document
//-------------------------------
// 返回要操作的对象
//-------------------------------
var $ = function (id) 
{
	return "string" == typeof id ? document.getElementById(id) : id;
};
//-------------------------------
// 创建操类
//-------------------------------
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;
}
//-------------------------------
// 创建动态显示图片的js类
//-------------------------------
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:		200,//滑动延时
			Auto:		true,//是否自动转换
			Pause:		3000,//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";
  	}
};

//-----------------------------------
// 纵向滚动图片
//-----------------------------------
function SlideY()
{
	function Each(list, fun)
	{
		for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
	};
	var objs = $("num_x").getElementsByTagName("li");
	var tv = new TransformView("scroll_x", "slider_x", 200, objs.length, {
		onStart : function(){ Each(objs, function(o, i){ o.className = tv.Index == i ? "on" : ""; }) }//按钮样式
	});
	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();
		}
	})	
}