// JavaScript Document// 图片大小
addDomLoad(function() {
    var Class = {
        create: function() {
            return function() {
                this.initialize.apply(this, arguments);
            }
        }
    }

    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;

            this._timer = null;
            this._slider = oSlider;

            this._parameter = parameter;
            this._count = count || 0;
            this._target = 0;
            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;
            oSlider.style.width = oSlider.getElementsByTagName('li')[0].clientWidth * count + 'px';
        },
        //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";
        }
    };
    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", 260, objs.length == 0 ? 1 : objs.length, {
        onStart: function() { Each(objs, function(o, i) { o.className = tv.Index == i ? "on" : ""; }) }, Up: false
    });

    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();
        }
    })
});