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:       7,//滑动变化率   
        Time:       15,//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();   
    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); }   
    };   
       
       
    ////////////////////////test2   
       
    var objs2 = $("idNum12").getElementsByTagName("li");   
       
    var tv2 = new TransformView("idTransformView2", "idSlider2", 549, 3, {   
        onStart: function(){ Each(objs2, function(o, i){ o.className = tv2.Index == i ? "on" : ""; }) },//按钮样式   
        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();   
        }   
    })   
       
    $("idStop1").onclick = function(){ tv2.Auto = false; tv2.Stop(); }   
    $("idStart1").onclick = function(){ tv2.Auto = true; tv2.Start(); }   
    $("idNext1").onclick = function(){ tv2.Index++; tv2.Start(); }   
    $("idPre1").onclick = function(){ tv2.Index--;tv2.Start(); }   
    $("idFast1").onclick = function(){ if(--tv2.Step <= 0){tv2.Step = 1;} }   
    $("idSlow1").onclick = function(){ if(++tv2.Step >= 10){tv2.Step = 10;} }   
    $("idReduce1").onclick = function(){ tv2.Pause-=1000; if(tv2.Pause <= 0){tv2.Pause = 0;} }   
    $("idAdd1").onclick = function(){ tv2.Pause+=1000; if(tv2.Pause >= 5000){tv2.Pause = 5000;} }   
       
    $("idReset1").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);   
    }   
       
}