用[frame()]数据标签制作的纯AS preLoader

http://www.cnblogs.com/crkay/archive/2010/05/31/1747947.html

原理的话就是使用[frame()]标签，改变文档类指向。具体操作大家可以去网路上查一下，这方面资料很多，我这里只将源码贴出来，和大家一同分享。

代码

   
   

    
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    默认程序入口： 
    
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    package
    
     
    
     4 
    
    { 
    
     5 
    
     
    
    import
    
     flash.display.Sprite; 
    
     6 
    
     
    
    import
    
     mx.core.BitmapAsset; 
    
     7 
    
     
    
     8 
    
    [Frame(factoryClass
    
    =
    
    "
    
    SystemManager
    
    "
    
    ,label
    
    =
    
    "
    
    hello
    
    "
    
    )] 
    
     9 
    
     
    
    10 
    
    public
    
     
    
    class
    
     MyApplication 
    
    extends
    
     Sprite { 
    
    11 
    
     
    
    12 
    
     [Embed(source
    
    =
    
    "
    
    test.png
    
    "
    
    )] 
    
    13 
    
     
    
    private
    
     var bigPicCls:Class; 
    
    14 
    
     
    
    15 
    
     
    
    public
    
     function MyApplication() { 
    
    16 
    
     var b:BitmapAsset 
    
    =
    
     
    
    new
    
     bigPicCls() as BitmapAsset; 
    
    17 
    
     addChild(b); 
    
    18 
    
     } 
    
    19 
    
    } 
    
    20 
    
    } 
    
    21 
    
     
    
    22 
   
   

 

代码

   
   

    
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     1 
    
    被指向的主文档类： 
    
     2 
    
     
    
     3 
    
    package
    
     { 
    
     4 
    
    import
    
     flash.display.DisplayObject; 
    
     5 
    
    import
    
     flash.display.MovieClip; 
    
     6 
    
    import
    
     flash.display.StageAlign; 
    
     7 
    
    import
    
     flash.display.StageScaleMode; 
    
     8 
    
    import
    
     flash.events.Event; 
    
     9 
    
    import
    
     flash.events.ProgressEvent; 
    
    10 
    
    import
    
     flash.utils.getDefinitionByName; 
    
    11 
    
     
    
    12 
    
    public
    
     
    
    class
    
     SystemManager 
    
    extends
    
     MovieClip 
    
    13 
    
    { 
    
    14 
    
     
    
    private
    
     var preLoader:PreLoader; 
    
    15 
    
     
    
    16 
    
     
    
    public
    
     function SystemManager() { 
    
    17 
    
     stage.scaleMode 
    
    =
    
     StageScaleMode.NO_SCALE; 
    
    18 
    
     stage.align 
    
    =
    
     StageAlign.TOP_LEFT; 
    
    19 
    
     
    
    20 
    
     stop(); 
    
    21 
    
     
    
    22 
    
     preLoader 
    
    =
    
     
    
    new
    
     PreLoader(); 
    
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     addChild(preLoader); 
    
    24 
    
     
    
    25 
    
     preLoader.x 
    
    =
    
     stage.stageWidth
    
    /
    
    2
    
     
    
    -
    
     preLoader.width
    
    /
    
    2
    
    ; 
    
    26 
    
     preLoader.x 
    
    =
    
     stage.stageHeight
    
    /
    
    2
    
     
    
    -
    
     preLoader.height
    
    /
    
    2
    
    ; 
    
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     loaderInfo.addEventListener(ProgressEvent.PROGRESS,progressHandle); 
    
    29 
    
     loaderInfo.addEventListener(Event.COMPLETE,completeHandler); 
    
    30 
    
     } 
    
    31 
    
     
    
    32 
    
     
    
    private
    
     function progressHandle(e:ProgressEvent):
    
    void
    
     
    
    33 
    
     { 
    
    34 
    
     preLoader.setProgress(e.bytesLoaded,e.bytesTotal); 
    
    35 
    
     } 
    
    36 
    
     
    
    37 
    
     
    
    private
    
     function completeHandler(e:Event):
    
    void
    
     { 
    
    38 
    
     loaderInfo.removeEventListener(ProgressEvent.PROGRESS,progressHandle); 
    
    39 
    
     loaderInfo.removeEventListener(Event.COMPLETE,completeHandler); 
    
    40 
    
     
    
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     removeChild(preLoader); 
    
    42 
    
     preLoader 
    
    =
    
     
    
    null
    
    ; 
    
    43 
    
     
    
    44 
    
     nextFrame(); 
    
    45 
    
     
    
    46 
    
     initApplication(); 
    
    47 
    
     } 
    
    48 
    
     
    
    49 
    
     
    
    private
    
     function initApplication():
    
    void
    
     { 
    
    50 
    
     
    
    /**
    
    这里不能直接写成： 
    
    51 
    
     var app:Application = new Application(); 
    
    52 
    
     这样的由于引用到 Application，Application中所有的资源都会被编译到第一帧来 
    
    53 
    
     这样的话 PreLoader就没有意义了，你也看不到PreLoader，就跳到第二帧了 
    
    54 
    
     *
    
    */
    
     
    
    55 
    
     var appCls:Class 
    
    =
    
     getDefinitionByName(
    
    "
    
    MyApplication
    
    "
    
    ) as Class; 
    
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     var app:DisplayObject 
    
    =
    
     
    
    new
    
     appCls() as DisplayObject; 
    
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     addChild(app); 
    
    58 
    
     } 
    
    59 
    
    } 
    
    60 
    
    } 
    
    61 
    
     
    
    62 
   
   

代码

   
   

    
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    进度条： 
    
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     3 
    
    package
    
     
    
     4 
    
    { 
    
     5 
    
    import
    
     flash.display.Sprite; 
    
     6 
    
    import
    
     flash.text.TextField; 
    
     7 
    
     
    
     8 
    
    public
    
     
    
    class
    
     PreLoader 
    
    extends
    
     Sprite 
    
     9 
    
    { 
    
    10 
    
     
    
    public
    
     function PreLoader() 
    
    11 
    
     { 
    
    12 
    
     var t:TextField 
    
    =
    
     
    
    new
    
     TextField(); 
    
    13 
    
     t.border 
    
    =
    
     
    
    true
    
    ; 
    
    14 
    
     t.text 
    
    =
    
     
    
    "
    
    loading......
    
    "
    
    ; 
    
    15 
    
     
    
    16 
    
     addChild(t); 
    
    17 
    
     } 
    
    18 
    
     
    
    19 
    
     
    
    public
    
     function setProgress(loaded:uint,total:uint):
    
    void
    
     
    
    20 
    
     { 
    
    21 
    
     var t:TextField 
    
    =
    
     getChildAt(
    
    0
    
    ) as TextField; 
    
    22 
    
     t.text 
    
    =
    
     
    
    "
    
    load: 
    
    "
    
    +
    
     loaded
    
    /
    
    1000
    
     
    
    +
    
     
    
    "
    
    /
    
    "
    
     
    
    +
    
     total
    
    /
    
    1000
    
    ; 
    
    23 
    
     
    
    24 
    
     trace(
    
    "
    
    load: 
    
    "
    
    +
    
     loaded
    
    /
    
    1000
    
     
    
    +
    
     
    
    "
    
    /
    
    "
    
     
    
    +
    
     total
    
    /
    
    1000
    
    ); 
    
    25 
    
     } 
    
    26 
    
    } 
    
    27 
    
    } 
    
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