最近在做地图JS和FLEX的封装工作,flex封装需要用到自定义事件这方面知识,在这里就简单介绍一下FLEX自定义事件。
自定义事件必须注意几点:
(1)自定义事件通过继承Event类来实现。
(2)自定义事件不可以自己触发,只能有系统事件派发。
首先我们新建一个ActionScript 类,这个类继承flash.events.Event。
复制代码 代码如下: 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"); } } }
创建一个组件来监听事件,实现数据的接受。
component.mxml
复制代码 代码如下: <?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" 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);//监听事件
} public function myEventHandler(eve:Object):void{
inpu.text = eve.data; Alert.show("事件触发,"+eve.data); }
]]> </fx:Script>
<fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations>
<s:Panel backgroundColor="#E7D4DD">
<s:TextInput>
</s:TextInput>
</s:Panel>
</s:Group>
主程序
FlexMyEvent.mxml
复制代码 代码如下: <?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%">
<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);//派发事件 myEve.data is Object; this.dispatchEvent(myEve);
}
]]> </fx:Script>
<fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations>
<mx:HBox horizontalAlign="center" verticalAlign="middle">
<s:Panel> <mx:HBox paddingLeft="5"> <s:TextInput text="Send Hello">
</s:TextInput> <s:Button label="Send">
</s:Button> </mx:HBox> </s:Panel>
<comp:Component>
</comp:Component> </mx:HBox>
</s:Application>
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