flex 展示二进制图片

 

1、创建as类

package com.dse.app.ydcj.widget
{
 
 import flash.display.Loader;
 import flash.events.Event;
 import flash.events.IOErrorEvent;
 import flash.system.LoaderContext;
 import flash.utils.ByteArray;
 
 import mx.controls.Alert;
 import mx.controls.Image;
 
 public class ShowErJinImg extends mx.controls.Image
 {
    private var _loader:Loader = new Loader();
  private var _bFillUp:Boolean = false;  //是/否平铺
  private var _bonthebl:Boolean=true;//是否按照比例缩放全图显示。
  public function Image():void {}
  override protected function createChildren():void
  {
   for(var i:int=numChildren-1;i>=0;i--){
    this.removeChildAt(i);
   }
   addChild(_loader);
  }
  public function get bonthebl():Boolean{
   return _bonthebl;
  }
  
  public function set bonthebl(value:Boolean):void{
   this._bonthebl = value;
  }
  
  public function get bFillUp():Boolean{
   return _bFillUp;
  }
  
  public function set bFillUp(value:Boolean):void{
   this._bFillUp = value;
  }
  
  public function loadBytes(bytes:ByteArray,context:LoaderContext=null):void
  {
   try
   {
    _loader.loadBytes(bytes);
    _loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onBytesLoaded);
    _loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR,onError);
    createChildren();
   }catch(e:Error)
   {
    Alert.show("该类型的文件不支持预览！");
   }

  }
  
  
  private function onError(event:IOErrorEvent):void
  {
   Alert.show("该类型的文件不支持预览！");
  }
  
  private function onBytesLoaded(e:Event):void
  {
   this.width=555;
   this.height=380;
   if(_bonthebl){
    var ih:int=e.currentTarget.height;
    var iw:int=e.currentTarget.width;
    var blh:Number=this.height/ih;
    var blw:Number=this.width/iw;
    if(blh>1&&blw>1){
     _loader.width=e.currentTarget.width;
     _loader.height=e.currentTarget.height;
    }
    else if(blh>1||blw>1){
     if(blh<1){
      _loader.width = Math.round(iw*blh);
      _loader.height = this.height;
     }else{
      _loader.width = this.width;
      _loader.height = Math.round(ih*blw);
     }
    }else{
     if(blh>blw){
      _loader.width = Math.round(iw*blw);
      _loader.height = Math.round(ih*blw);
     }
     else{
      _loader.width = Math.round(iw*blh);
      _loader.height = Math.round(ih*blh);
     }
    }
    this.width=_loader.width;
    this.height=_loader.height;
   }
   if(_bFillUp)
   {
    _loader.width = this.width;
    _loader.height = this.height;
   }  
  }
  
  public function SetWidth(newWidth:Number):void{
   this.width = newWidth;
   this._loader.width = this.width;        
  }     

  
 }
}

 

 

2、展示调用

private function dY:void{

img.loadBytes(imglist[imgnum].imgurl);

}

 

 

 

<widget:ShowErJinImg   id="img"  height="380" width="555" mouseWheel="{sco(event)}"/>