flex event标签

发布时间：2020-12-15 04:14:12 所属栏目：百科来源：网络整理

导读：ActionScript 3语言 : package ? event { ?? import ? flash.events.Event ; ?? public ? class ? MyEvent ? extends ? Event ?? { ???? static ? const ? EVENT_TEST : String = "EventTest" ; ???? function? MyEvent ( type , ? bubbles Boolean = false

ActionScript 3语言:

 
   package? 
   event 
   
{ 
   
?? 
   import? 
   flash.events.Event; 
   

?? 
   public? 
   class? 
   MyEvent? 
   extends? 
   Event 
   
?? 
   { 
   
???? 
   static? 
   const? 
   EVENT_TEST 
   : 
   String 
   = 
   "EventTest"; 
   

???? 
   function? 
   MyEvent( 
   type 
   ,? 
   bubbles 
   Boolean 
   = 
   false 
   cancelable 
   false) 
   
???? 
   { 
   
?????? 
   super( 
   cancelable); 
   
???? 
   } 
   
?? 
   } 
   
} 
  

定义MyButton extends Button

MXML语言:

<?xml version="1.0" encoding="utf-8"?>
<s:Button? xmlns:fx= "http://ns.adobe.com/mxml/2009"
?????? xmlns:s= "library://ns.adobe.com/flex/spark"
?????? xmlns:mx= "library://ns.adobe.com/flex/halo"
?????? click= "dispatchEvent(new MyEvent(MyEvent.EVENT_TEST));" >
?? <fx:Script>
???? <![CDATA[
?????? import? event.MyEvent;
???? ]]>
?? </fx:Script>
?? <fx:Metadata>
?????? 
??????? [Event(name ="EventTest",type ="event.MyEvent")]
?? </fx:Metadata>
</s:Button>

Main App

<s:Application? "http://ns.adobe.com/mxml/2009"
????????? "library://ns.adobe.com/flex/spark"
????????? "library://ns.adobe.com/flex/halo"
????????? xmlns:my= "button.*"
????????? minWidth= "1024"
????????? minHeight= "768" event.MyEvent;
?????? /**
?????? * 定义Event的函数监听方式
?????? * 在my2 的 EventTest="handleEvent(event)" 相当于对于该Event注册了一个Listiner
?????? * 消息监听函数为handleEvent(event)
?????? */
?????? private? function? handleEvent( e : MyEvent ): void {? trace( e);? }
???? </fx:Script>
?? 
?? <my:MyButton? id= "my1"? EventTest= "myTa.text='got Event';"? x= "208"? y= "213" ></my:MyButton>
?? "my2"? "handleEvent(event)"? "209"? "258" <s:TextArea? "myTa"? "141"? "55" />
</s:Application>

解释：

1· 在MyButton中将[Event]标签放入Metadata标签中，则告诉编译器该空间会产生该种Event，

???如果此时dispatchEvent出去的Event不是该种类型则在编译期间及会报错。

2· 在主类中<my:MyButton id="my1" EventTest="myTa.text='got Event';" x="208" y="213"></my:MyButton>

?? 由于EventTest已经在Metadata做了标记，即可使用代码提示功能找到相应的Event。

???EventTest="myTa.text='got Event';"??表示为EventTest 这个Event注册一个监听者，监听到信息后处理方式为

?? myTa.text='got Event' ， same as the?EventTest="handleEvent(event)

（编辑：李大同）

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