tree 透过插件加载图片

通过IconUtility.as 来动态加载tree组件图片:

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IconUtility.as 源文件如下:

package vim.components
{
	import flash.display.BitmapData;
	import flash.display.Loader;
	import flash.display.LoaderInfo;
	import flash.events.Event;
	import flash.geom.Matrix;
	import flash.net.URLRequest;
	import flash.system.LoaderContext;
	import flash.utils.Dictionary;
	
	import mx.containers.accordionClasses.AccordionHeader;
	import mx.controls.tabBarClasses.Tab;
	import mx.core.BitmapAsset;
	import mx.core.UIComponent;
	
	/**
	 * Provides a workaround for using run-time loaded graphics in styles and properties which require a Class reference
	 */
	public class IconUtility extends BitmapAsset
	{
		
		private static var dictionary:Dictionary;
		
		/**
		 * Used to associate run-time graphics with a target
		 * @param target A reference to the component associated with this icon
		 * @param source A url to a JPG, PNG or GIF file you wish to be loaded and displayed
		 * @param width Defines the width of the graphic when displayed
		 * @param height Defines the height of the graphic when displayed
		 * @return A reference to the IconUtility class which may be treated as a BitmapAsset
		 * @example <mx:Button id="button" icon="{IconUtility.getClass(button, 'http://www.yourdomain.com/images/test.jpg')}" />
		 */
		public static function getClass( target:UIComponent, source:String, width:Number = NaN, height:Number = NaN ):Class {
			if(!dictionary) {
				dictionary = new Dictionary(false);
			}
			//if(source is String) {
				var loader:Loader = new Loader();
				loader.load(new URLRequest(source as String), new LoaderContext(true));
				//source = loader;
			//}
			dictionary[target] = { source:loader, width:width, height:height };
			return IconUtility;
		}
		
		/**
		 * @private
		 */
		public function IconUtility():void {
			addEventListener(Event.ADDED, addedHandler, false, 0, true)
		}
		
		private function addedHandler(event:Event):void {
			if(parent) {
				if(parent is AccordionHeader) {
					var header:AccordionHeader = parent as AccordionHeader;
					getData(header.data);
				} else if(parent is Tab) {
					var tab:Tab = parent as Tab;
					getData(tab.data);
				} else {
					getData(parent);
				}
			}
		}
		
		private function getData(object:Object):void {
			var data:Object = dictionary[object];
			if(data) {
				var source:Object = data.source;
				if(data.width > 0 && data.height > 0) {
					bitmapData = new BitmapData(data.width, data.height, true, 0x00FFFFFF);
				}
				if(source is Loader) {
					var loader:Loader = source as Loader;
					if(!loader.content) {
						loader.contentLoaderInfo.addEventListener(Event.COMPLETE, completeHandler, false, 0, true);
					} else {
						displayLoader(loader);
					}
				}
			}
		}
		
		private function displayLoader( loader:Loader ):void {
			if(!bitmapData) {
				bitmapData = new BitmapData(loader.content.width, loader.content.height, true, 0x00FFFFFF);
			}
			bitmapData.draw(loader, new Matrix(bitmapData.width/loader.width, 0, 0, bitmapData.height/loader.height, 0, 0));
			if(parent is UIComponent) {
				var component:UIComponent = parent as UIComponent;
				component.invalidateSize();
			}
		}
		
		private function completeHandler(event:Event):void {
			if(event && event.target && event.target is LoaderInfo) {
				displayLoader(event.target.loader as Loader);
			}
		}
		
	}
}

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引入文件:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
				xmlns:mx="library://ns.adobe.com/flex/mx" layout="absolute" minWidth="955" minHeight="600">
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
	</fx:Declarations>
	
	
	<fx:Script>
		<![CDATA[
			import com.tw.IconUtility;
			
			import mx.controls.Alert;
			import mx.core.UIComponent;
			[Bindable]
			var xml:XML = <dep name="中烟"><user name="tw1" icon="1"></user></dep>;
			
			//var xml:XML = <dep name="中烟"><dep name="1公司"><user name="tw1" icon="1"></user><user name="tw1--333" icon="22"></user></dep><dep name="2公司"></dep></dep>;
			
			/** 改变树图标 */
			private function setTreeIcon(item:Object):Class{
				var url:String = "bao1.jpg";
				var node:XML = item as XML;
				var nodeIcon:String = node.@icon;
				
				if(node!=null && nodeIcon!=null && nodeIcon.length!=0){
					return IconUtility.getClass(tree_deps.itemToItemRenderer(item) as UIComponent, url, 20, 20);
				}else{
					return null;
				}
			}
			
		]]>
	</fx:Script>
	<mx:Tree id="tree_deps" x="195" y="63" height="311" width="326" dataProvider="{xml}" labelField="@name" iconFunction="setTreeIcon"></mx:Tree>
	
</mx:Application>

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源文件请参考附件..

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