最近在做地圖JS和FLEX的封裝工作，flex封裝需要用到自定義事件這方面知識，在這里就簡單介紹一下FLEX自定義事件。
自定義事件必須注意幾點：
（1）自定義事件通過繼承Event類來實現(xiàn)。
（2）自定義事件不可以自己觸發(fā)，只能有系統(tǒng)事件派發(fā)。
首先我們新建一個ActionScript 類，這個類繼承flash.events.Event。
復制代碼 代碼如下:
package
{
import flash.events.Event;
public class MyEvent extends Event
{
public static const myEvent:String="myEvent";
public var data:*;
public function MyEvent(type:String,bubbles:Boolean=false,cancellabel:Boolean=false,data:* = null)
{
super(type,false,false);
this.data = data;
}
override public function clone():Event{
return new MyEvent(myEvent,false,false,data);
}
override public function toString():String{
return formatToString("MyEvent");
}
}
}
創(chuàng)建一個組件來監(jiān)聽事件，實現(xiàn)數(shù)據(jù)的接受。
component.mxml
復制代碼 代碼如下:
?xml version="1.0" encoding="utf-8"?>
s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" width="100%" height="100%" initialize="init()">
s:layout>
s:BasicLayout/>
/s:layout>
fx:Script>
![CDATA[
import mx.controls.Alert;
import mx.events.FlexEvent;
public var ff:FlexMyEvent;
public function init():void{
ff = this.parentDocument as FlexMyEvent;
ff.addEventListener(MyEvent.myEvent,myEventHandler);//監(jiān)聽事件
}
public function myEventHandler(eve:Object):void{
inpu.text = eve.data;
Alert.show("事件觸發(fā)，"+eve.data);
}
]]>
/fx:Script>
fx:Declarations>
!-- 將非可視元素（例如服務(wù)、值對象）放在此處 -->
/fx:Declarations>
s:Panel width="100%" height="100%" backgroundColor="#E7D4DD">
s:TextInput id="inpu">
/s:TextInput>
/s:Panel>
/s:Group>
主程序
FlexMyEvent.mxml
復制代碼 代碼如下:
?xml version="1.0" encoding="utf-8"?>
s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
xmlns:comp = "*"
width="100%" height="100%">
fx:Script>
![CDATA[
import flash.external.ExternalInterface;
import flash.system.Security;
import mx.controls.Alert;
import mx.events.FlexEvent;
public var callBackInfo:String = "";
public function doSend():void{
callBackInfo = input.text;
var myEve:MyEvent = new MyEvent(MyEvent.myEvent,false,false,callBackInfo);//派發(fā)事件 myEve.data is Object;
this.dispatchEvent(myEve);
}
]]>
/fx:Script>
fx:Declarations>
!-- 將非可視元素（例如服務(wù)、值對象）放在此處 -->
/fx:Declarations>
mx:HBox width="100%" height="100%" horizontalAlign="center" verticalAlign="middle">
s:Panel width="100%" height="100%">
mx:HBox paddingLeft="5" width="100%" height="100%">
s:TextInput id="input" text="Send Hello">
/s:TextInput>
s:Button label="Send" click="doSend()">
/s:Button>
/mx:HBox>
/s:Panel>
comp:Component>
/comp:Component>
/mx:HBox>
/s:Application>
