/*焦点图组件1.0 彭成刚 QQ:76526211 开发时间：2010.4.23 http://t.sina.com.cn/pengchenggang/ */
function focus1(options)
{
	this.SetOptions(options);
	
	this.writeHtml();
	
	var container = this.options.objStr+"idTransformView2";
	var slider = this.options.objStr+"idSlider2";
	var idNum2 = this.options.objStr+"idNum2";
	var parameter = this.options.width.replace("px","");//图片宽度
	var count = this.options.picSrcArr.length;//图片个数
	
	//设置css属性
	this.$(container).style.width = this.options.width;
	this.$(container).style.height = this.options.height;
	this.$(slider).style.width = parseInt(parameter)*parseInt(count)*2+"px";
	
	if(parameter <= 0 || count <= 0) return;
	var oContainer = this.$(container);
	var oSlider = this.$(slider);
	var oThis = this;

	//------------------------
	this.objs2 = this.$(idNum2).getElementsByTagName("li");
	

	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.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;
	
	this.Start();
	
	
	this.Each(this.objs2, function(o, i, oThis){
		o.onmouseover = function(){
			o.className = "on";
			oThis.Auto = false;
			oThis.Index = i;
			oThis.Start();
		}
		o.onmouseout = function(){
			o.className = "";
			oThis.Auto = true;
			oThis.Start();
		}
	})

}

//设置默认属性
focus1.prototype.SetOptions = function(options) 
{
	this.options = {//默认值
		Up:			false,//是否向上(否则向左)
		Step:		8,//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(){this.Each(this.objs2, function(o, i, oThis){ o.className = oThis.Index == i ? "on" : ""; })},//开始转换时执行
		onFinish:	function(){}//完成转换时执行
	};
	this.extend(this.options, options || {});
}
  
//开始切换设置
focus1.prototype.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
focus1.prototype.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
focus1.prototype.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
focus1.prototype.Stop = function(iTarget, iNow) {
	clearTimeout(this._timer);
	this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
  }

focus1.prototype.$ = function(id)
{
	return "string" == typeof id ? document.getElementById(id) : id;
}
focus1.prototype.extend = function(destination, source) {
	for (var property in source) {
		destination[property] = source[property];
	}
	return destination;
}
focus1.prototype.Each = function(list, fun)
{
	for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i, this); }
};

focus1.prototype.getTemplate = function()
{
	var t = "";
	t += "<div class='container' id='$objStr$idTransformView2'>";
    t += "<ul class='slider slider2' id='$objStr$idSlider2'>";
    t += "$liPicList";
    t += "</ul>";
    t += "<ul class='num' id='$objStr$idNum2'>";
    t += "$liNumList";
    t += "</ul>";
	t += "</div>";
	return t;
}

focus1.prototype.writeHtml = function()
{
	var t = this.getTemplate();
	t = t.replace(new RegExp("\\$objStr\\$","g"),this.options.objStr);//替换id
	
	var picListTemplate = "<li>"+this.options.oTemplate+"</li>";
	//模板参数 $picHref $picSrc
	var pltList = "";
	for(var i in this.options.picSrcArr)
	{
		pltList += picListTemplate.replace("$picSrc",this.options.picSrcArr[i].picSrc).replace("$picHref",this.options.picSrcArr[i].picHref);
	}
	//替换列表图片
	t = t.replace("$liPicList",pltList);
	
	var numTemplate = "<li>$num</li>";
	var nt = "";
	for(var i = 0; i < this.options.picSrcArr.length; i++)
	{
		nt += numTemplate.replace("$num",i+1);
	}
	
	//替换数字列表
	t = t.replace("$liNumList",nt);
	document.write(t);
}