Flex 使用wigdet组件库 实现自定义事件 派发 和 监听

在这里主要说明的是 在组件和模块之间传递事件是需要模块同时继承<viewer:BaseWigdet></viewer:BaseWigdet>才可以监听到事件。

wigdet本身的BaseWigdet就是一个模块，它是继承Module的。所以说你们如果是要在继承BaseWigdet的模块派发事件，然后在没有继承BaseWigdet的自定义组件里是监听不到的。如果你这样做的话，想实现事件监听那就把自定义组件去继承BaseWigdet就可以了。

自定义事件类  UploadEvent.as 

  

 1 package widgets.ProvincePgis.PlotSystem.planConfigurationManage.events
 2 {
 3     /** 
 4      * @Content 上传 事件类
 5      * @Author sange 
 6      * @E-mail: sange.chen@gmail.com 
 7      * @Version 1.0.0 
 8      * @Date：Apr 12, 2012 6:52:25 PM 
 9      */
10     import flash.events.Event;
11     import flash.events.EventDispatcher;
12     
13     public class UploadEvent extends Event
14     {
15         private var _data:Object;
16         
17         public static const UPLOAD_COMPLETE:String = "uploadComplete";
18         public static const UPLOADVIEW:String = "uploadView";
19         public static const UPLOAD_SECURITY_ERROR:String="uploadSecurityError";
20         public static const UPLOAD_ERROR:String = "uploadIoError";
21         
22         public static var dispatcher:EventDispatcher = new EventDispatcher();
23         
24         public function UploadEvent(obj:Object ,type:String, bubbles:Boolean=false, cancelable:Boolean=false)
25         {        
26             _data = obj;
27             super(type, bubbles, cancelable);
28         }
29         
30         public function get data():Object
31         {
32             return _data;
33         }
34         
35         override public function clone():Event
36         {
37             return new UploadEvent(_data,type,bubbles,cancelable);
38         }        
39     }
40 }

 看到定义了一个静态变量 dispatcher，是EventDispatcher类型，用dispatcher 
可以任何地方监听到。 

Main.mxml 

 var panl:IFlexDisplayObject = PopUpManager.createPopUp(this,FileUploadWidget,true);
2                 PopUpManager.centerPopUp(panl);
3                 UploadEvent.dispatcher.dispatchEvent(new UploadEvent(__uploadFileUrl,UploadEvent.UPLOADVIEW));

 FileUploadWidget.mxml

  1 protected function init(event:FlexEvent):void 

 2             { 3                 UploadEvent.dispatcher.addEventListener(UploadEvent.UPLOADVIEW,uploadViewHandler);
 4                 
 5                 _arrUploadFiles = new ArrayCollection();                
 6                 enableUI();
 7                 uploadCheck();
 8             }
 9 private function uploadViewHandler(e:UploadEvent):void
10             {
11                 _strUploadUrl = new String(e.data);
12             }