bgchange

Application.application.setStyle("backgroundColor", "#00FF00");

	
					import mx.controls.Image;

			private var _image : Image = null;

			public function setTileImage( image : Image ) : void
			{
				this._image = image;
				this.invalidateDisplayList();
			}

			public function setBackground(source:String) : void
			{
				// 1. for crossdomain images, we need to create a LoaderContext object and set its checkPolicyFile to true.
				var loaderContext : LoaderContext = new LoaderContext ();
				loaderContext.checkPolicyFile = true;

				// 2. assign that loaderContext object to an Image object
				var image : Image =  new Image();
				image.loaderContext =  loaderContext;

				// 3. set source and load
				image.source = source;
				image.addEventListener( Event.COMPLETE, onImageLoaded  );
				image.load();


			}

			private function onImageLoaded( event : Event ) : void
			{
				var image : Image = Image( event.currentTarget );

				// 1. set as tile image background
				this.setTileImage( image );
			}


			override protected function updateDisplayList( unscaledWidth : Number, unscaledHeight : Number ) : void
			{
				super.updateDisplayList(unscaledWidth, unscaledHeight );

				if ( _image != null )
				{
					var bitmap : Bitmap = Bitmap( _image.content );
					var bitmapData : BitmapData = new BitmapData( bitmap.width, bitmap.height );
					bitmapData.draw( bitmap );

					graphics.clear();
					graphics.beginBitmapFill( bitmapData );
					graphics.drawRect(0, 0, unscaledWidth, unscaledHeight);
					graphics.endFill();
				}
			}
		]]>
	

	
					private function clickHandler():void{
				this.tc.setBackground(this.textInput.text);
			}
		]]>
	

	
	
		
		
		
	

	
	

  title="桌面背景">

  
    import mx.managers.PopUpManager;
  import mx.core.Application;   
  import mx.binding.utils.BindingUtils;   
  [Bindable]
  ？？？？？？？？？？？？？？？？？
  public var backimage:Class；


  private function DVbtn1_clickHandler(event:MouseEvent):void

  {   
  PopUpManager.removePopUp(this);
  }

  private function DVbtn2_clickHandler(event:MouseEvent):void
  {
  PopUpManager.removePopUp(this);
  }
  private function DVbtn3_clickHandler(event:MouseEvent):void
  {   
  Application.application.setStyle("backgroundImage",backimage);
  }

  ]]>
  



  
    source="{ViewList.selectedItem.@middleImage}"
  maintainAspectRatio="true"
  horizontalAlign="center"/>
  
    itemRenderer="puremvc.view.UI.CustomItemRenderer"
  height="90" columnCount="4" columnWidth="80" rowCount="1" rowHeight="90">
  
  
  
  
  
  
  


然后是xml文件


    middleImage="assets/middle1.jpg"
  smallImage="assets/small1.jpg"
  fullImage="assets/full1.jpg"/>
    fullImage="assets/full2.jpg"
  middleImage="assets/middle2.jpg"
  smallImage="assets/small2.jpg" />
    fullImage="assets/full3.jpg"
  middleImage="assets/middle3.jpg"
  smallImage="assets/small3.jpg" />
    fullImage="assets/full4.jpg"
  middleImage="assets/middle4.jpg"
  smallImage="assets/small4.jpg" />
    fullImage="assets/full5.jpg"
  middleImage="assets/middle5.jpg"
  smallImage="assets/small5.jpg" />
    fullImage="assets/full6.jpg"
  middleImage="assets/middle6.jpg"
  smallImage="assets/small6.jpg" />
    fullImage="assets/full7.jpg"
  middleImage="assets/middle7.jpg"
  smallImage="assets/small7.jpg" />

public var backimage:Class；改一下。

定义并赋初值
public var backimage:String = new String(Application.application.getStyle("backgroundImage");

HorizontalList的selectedItem属性会返回image
private function selectImage():void
{
backimage = selectedItem.fullImage;
}

加入单击处理
itemRenderer="puremvc.view.UI.CustomItemRenderer"
height="90" columnCount="4" columnWidth="80" rowCount="1" rowHeight="90"
click="selectImage()">