Flex : 自定义 Event

//myEvents\events\TestEvent.as

package myEvents. events
{
 // Writed by Aslan Shek
 // http://www.slsay.com/archives/25
 import flash.events . Event ;
 public class TestEvent extends Event
 {
  public static const EVENT_A: String = "eventA" ;
  public static const EVENT_B: String = "eventB" ;  
  public function TestEvent( type : String )
  {
   super ( type ) ;
  }
 }
}

//myEvents\TestEventComp.mxml

<?xml version="1.0" encoding="utf-8" ?>
<!-- http://www.slsay.com/archives/25 -->
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml"
     width="400" height="300" >
 <mx:Script>
 <![CDATA[
  // http://www.slsay.com/archives/25
  import myEvents.events.TestEvent;
 ]]>
</mx:Script>
 <mx:Metadata >
  [Event(name="eventA", type="myEvents.events.TestEvent")]
 </mx:Metadata >
 <mx:Button label="Test Event"
    click="dispatchEvent(new TestEvent(TestEvent.EVENT_A));" />
</mx:Canvas >

//test.mxml

<? xml version ="1.0" encoding="utf-8" ?>
<!-- http: //yecon.blog.hexun.com/28759584_d.html -->
< mx: Application xmlns: mx="http://www.adobe.com/2006/mxml"
      layout="absolute"
      xmlns: myEvents="myEvents.*" >
 < mx: Script>
  <! [ CDATA[
   // Writed by Aslan Shek
   // http://www.slsay.com/archives/25
   import myEvents. events. TestEvent;
   private function testEventHandler( evt: TestEvent) : void
   {
    trace ( "asdf" ) ;
   }
  ] ] >
 </ mx: Script>
 < myEvents: TestEventComp eventA="testEventHandler(event);" />
</ mx: Application>