import com.tweener.transitions.Tweener;

import flash.display.Sprite;

var _num:int = 3;//始终三张显示图片

var _width:Number = 278;//图片的宽度

var _objArr:Array = [];

var _container:Sprite = new Sprite();

this.addChild(_container);

initContainer();

leftBtn.addEventListener(MouseEvent.CLICK,onLeftClick);

rightBtn.addEventListener(MouseEvent.CLICK,onRightClick);

function initContainer():void

{

    for (var i:int = 0; i<_num*2; i++)

    {

        var img:TestImage = new TestImage();//测试的图片元件

        img.x = _width * i;

        img.t.text = (i % _num).toString();

        //此处可以加载图片，地址索引： [i % _num]，比如arr[i % _num]

        _objArr.push(img);

        _container.addChild(img);

    }

}

function onLeftClick(e:MouseEvent):void

{

    //向右移动之前，将最后一个元素放到第一个位置

    if (isTweening())

    {

        return;

    }

    _objArr.unshift(_objArr.pop());

    _objArr[0].x = -_width;

    for (var i:int = 0; i<_objArr.length; i++)

    {

        Tweener.addTween(_objArr[i],{x:i*_width,time:1,transition:"easeOutCubic"});

    }

}

function onRightClick(e:MouseEvent):void

{

    if (isTweening())

    {

        return;

    }

    for (var i:int = 0; i<_objArr.length; i++)

    {

        Tweener.addTween(_objArr[i],{x:i*_width-_width,time:1,transition:"easeOutCubic"});

    }

    setTimeout(onPush,1000);

    function onPush():void

    {

        //向左移动之后，将第一个元素放到最后一个位置

        _objArr.push(_objArr.shift());

        _objArr[_objArr.length-1].x = _width*(_objArr.length-1);

    }

}

function isTweening():Boolean

{

    for (var i:int = 0; i<_objArr.length; i++)

    {

        if (Tweener.isTweening(_objArr[i]))

        {

            return true;

        }

    }

    return false;

}