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 = {
    //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: 8, //滑动变化率
            Time: 20, //滑动延时
            Auto: true, //是否自动转换
            Pause: 5000, //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();
        document.getElementById('images_1').style.display = 'none';
        document.getElementById('images_2').style.display = 'none';
        document.getElementById('images_3').style.display = 'none';
        document.getElementById('images_4').style.display = 'none';
        document.getElementById('images_5').style.display = 'none';
        document.getElementById('images_' + (this.Index + 1)).style.display = '';
        var intid = this.Index + 1;
        switch (intid) {
            case 1:
                document.getElementById("tab_title").innerText = "";
                document.getElementById("btn_lmore").style.display = "none";
                document.getElementById("tab_topimg").style.display = "none";
                break;
            case 2:
                document.getElementById("tab_title").innerText = "Design";
                document.getElementById("btn_lmore").style.display = "";
                document.getElementById("tab_topimg").style.display = "";
                document.getElementById("tab_link").href = "../Content.aspx?ID=61&source=tab&count=1";
                break;
            case 3:
                document.getElementById("tab_title").innerText = "Flexibility";
                document.getElementById("btn_lmore").style.display = "";
                document.getElementById("tab_topimg").style.display = "";
                document.getElementById("tab_link").href = "../Content.aspx?ID=62&source=tab&count=2";
                break;
            case 4:
                document.getElementById("tab_title").innerText = "Reliability";
                document.getElementById("btn_lmore").style.display = "";
                document.getElementById("tab_topimg").style.display = "";
                document.getElementById("tab_link").href = "../Content.aspx?ID=63&source=tab&count=3";
                break;
            case 5:
                document.getElementById("tab_title").innerText = "Profitability";
                document.getElementById("btn_lmore").style.display = "";
                document.getElementById("tab_topimg").style.display = "";
                document.getElementById("tab_link").href = "../Content.aspx?ID=64&source=tab&count=4";
                break;
        }
        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";
    }
};

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", 320, 5, {
		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();
		}
	})
}