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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--> 1 默认程序入口：
 2 
 3  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();
23     addChild(preLoader);
24    
25     preLoader.x = stage.stageWidth/2 - preLoader.width/2;
26     preLoader.x = stage.stageHeight/2 - preLoader.height/2;
27    
28     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    
41     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;
56     var app:DisplayObject = new appCls() as DisplayObject;
57     addChild(app);
58    }
59 }
60 }
61 
62 

代码

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--> 1 进度条：
 2 
 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 }
28