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(shí)，在這里就簡(jiǎn)單介紹一下FLEX自定義事件。
自定義事件必須注意幾點(diǎn)：
（1）自定義事件通過(guò)繼承Event類(lèi)來(lái)實(shí)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(gè)ActionScript 類(lèi)，這個(gè)類(lèi)繼承flash.events.Event。
復(fù)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(gè)組件來(lái)監(jiān)聽(tīng)事件，實(shí)現(xiàn)數(shù)據(jù)的接受。
component.mxml
復(fù)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(tīng)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(duì)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(fù)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(duì)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>
