tree 通过插件加载图片
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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