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AS3工程中Loading的施用(Frame标签的使用)

热度:143   发布时间:2012-10-28 09:54:44.0
AS3工程中Loading的应用(Frame标签的使用)
Demo1:
原理的话就是使用[frame()]标签,改变文档类指向。
默认程序入口:
package
{
import flash.display.Sprite;
import mx.core.BitmapAsset;

[Frame(factoryClass="SystemManager",label="hello")]

public class MyApplication extends Sprite {
  
   [Embed(source="test.png")]
   private var bigPicCls:Class;
  
   public function MyApplication() {
    var b:BitmapAsset = new bigPicCls() as BitmapAsset;
    addChild(b);
   }
}
}

被指向的主文档类:
package {
import flash.display.DisplayObject;
import flash.display.MovieClip;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.events.ProgressEvent;
import flash.utils.getDefinitionByName;

public class SystemManager extends MovieClip 
{
   private var preLoader:PreLoader;
  
   public function SystemManager() {
    stage.scaleMode = StageScaleMode.NO_SCALE;
    stage.align = StageAlign.TOP_LEFT;
   
    stop();
   
    preLoader = new PreLoader();
    addChild(preLoader);
   
    preLoader.x = stage.stageWidth/2 - preLoader.width/2;
    preLoader.x = stage.stageHeight/2 - preLoader.height/2;
   
    loaderInfo.addEventListener(ProgressEvent.PROGRESS,progressHandle);
    loaderInfo.addEventListener(Event.COMPLETE,completeHandler);
   }
  
   private function progressHandle(e:ProgressEvent):void 
   {
    preLoader.setProgress(e.bytesLoaded,e.bytesTotal);
   }
  
   private function completeHandler(e:Event):void {
    loaderInfo.removeEventListener(ProgressEvent.PROGRESS,progressHandle);
    loaderInfo.removeEventListener(Event.COMPLETE,completeHandler);
   
    removeChild(preLoader);
    preLoader = null;
   
    nextFrame();
   
    initApplication();
   }
  
   private function initApplication():void {
    /**这里不能直接写成:
    var app:Application = new Application();
    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
    这样的话 PreLoader就没有意义了,你也看不到PreLoader,就跳到第二帧了
    **/
    var appCls:Class = getDefinitionByName("MyApplication") as Class;
    var app:DisplayObject = new appCls() as DisplayObject;
    addChild(app);
   }
}
}

进度条:
package 
{
import flash.display.Sprite;
import flash.text.TextField;

public class PreLoader extends Sprite 
{
   public function PreLoader() 
   {
    var t:TextField = new TextField();
    t.border = true;
    t.text = "loading......";
   
    addChild(t);
   }
  
   public function setProgress(loaded:uint,total:uint):void 
   {
    var t:TextField = getChildAt(0) as TextField;
    t.text = "load: "+ loaded/1000 + "/" + total/1000;
   
    trace("load: "+ loaded/1000 + "/" + total/1000);
   }
}
}

Demo2:
由于AS工程没有帧..所以不能用常用的方法来做Loading,这里介绍的方法使用元标签Frame(应该是元标签吧?还是叫元数据标签),网上对Frame的介绍是...使用指定的类替换文档类,并把其它的东西都丢到了该类的第二帧。
引用
Preloader类

  package

  {
  import flash.display.DisplayObject;
  import flash.display.MovieClip;
   import flash.display.StageScaleMode;
  import flash.events.Event;
  import flash.events.ProgressEvent;
  import flash.text.TextField;
  import flash.text.TextFormat;
  import flash.utils.getDefinitionByName;
  /**

  * 加载类,由于原内容会放到此类的第二帧~所以需要使用MovieClip;

  * @author L4cd.Net

  */
  public class Preloader extends MovieClip
  {
  [Embed(source="l4cd_48_48.jpg")]
  private var LogoClass:Class;
  private var text:TextField;
  public function Preloader()
  {
  //不多说了
  stage.scaleMode = StageScaleMode.NO_SCALE;
  stage.showDefaultContextMenu = false;
  //显示一张图片..非必要
  with(addChild(new LogoClass()))
  {
  x=(500-48)/2;
  y=(380-48)/2;
  }
  //加一个textField显示进度
  text = addChild(new TextField()) as TextField;
  with(text)
  {
  defaultTextFormat = new TextFormat("宋体",12,0,null,null,null,null,null,"center");

  mouseEnabled = false;

  height = 16;

  x = (500-100)/2;

  y = 35+(380-15)/2;

  }

  //重要~侦听~

  loaderInfo.addEventListener(ProgressEvent.PROGRESS,progress);

  loaderInfo.addEventListener(Event.COMPLETE,complete);

  }

  //显示进度

  private function progress(e:ProgressEvent):void

  {

  text.text = (e.bytesLoaded/e.bytesTotal*100).toFixed(2)+"% Loaded";

  }

  private function complete(e:Event):void

  {

  //重要..加载完后...我们跳转到第二帧

  gotoAndStop(2);

  //获取文档类...然后显示,对于此步操作..有多种方法..有人习惯直接把原文档类addChild到此类当中..

  var mainClass:Class = Class(getDefinitionByName("AsProjectLoadingExample"));

  stage.addChild(new mainClass() as DisplayObject);

  //删除此类

  destroy();

  }

  private function destroy():void

  {

  loaderInfo.removeEventListener(ProgressEvent.PROGRESS,progress);

  loaderInfo.removeEventListener(Event.COMPLETE,complete);

  parent.removeChild(this);

  }

  }

  }

  AsProjectLoadingExample类

  package {

  import flash.display.Bitmap;

  import flash.display.BitmapData;

  import flash.display.Sprite;

  import flash.geom.Matrix;

  [SWF(width="500",height="380",backgroundColor="#FFFFFF",frameRate="24")]

  //注意此行,Preloader为类名

  [Frame(factoryClass="Preloader")]

  public class AsProjectLoadingExample extends Sprite

  {

  [Embed(source="CD艳照.png")]

  private var ImageClass:Class;

  //嵌入一个2M的文件以显示加载效果

  [Embed(source="something.wma",mimeType="application/octet-stream")]

  private var SomeClass:Class;
   public function AsProjectLoadingExample()
  {
 //马赛格ing...
  var bmp:Bitmap = new ImageClass();
   var bit:BitmapData = new BitmapData(bmp.width/10,bmp.height/10,true,0);
  bit.draw(bmp,new Matrix(.1,0,0,.1));
  with (addChild(new Bitmap(bit)))
  {
  scaleX = scaleY = 10;
    }
    }
  }
 }

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