Flex之自定义事件

1、通过dispatchEvent委托事件模式完成自定义事件：

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               creationComplete="application1_creationCompleteHandler()"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
    </fx:Declarations>
    <fx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.events.FlexEvent;
            import mx.messaging.events.MessageEvent;
 
            protected function application1_creationCompleteHandler():void
            {
                this.addEventListener("Clicked",clickedHandler);
                Alert.show(" creationComplete ","提示");
            }
 
            private function clickedHandler(e:Event):void{
                Alert.show("事件响应","提示");
            }
 
            protected function button1_clickHandler():void
            {
                dispatchEvent(new Event("Clicked"));
                Alert.show(" click ","提示");
            }
 
        ]]>
    </fx:Script>
    <fx:Metadata>
        [Event(name="Clicked",type="flash.events.Event")]
    </fx:Metadata>
    <s:Button x="102" y="29" label="按钮" enabled="true" width="85" height="35" click="button1_clickHandler()" />
</s:Application>

2、通过继承Event类是实现自定义事件：

<?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" creationComplete="application1_creationCompleteHandler(event)"
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
    <s:layout>
        <s:BasicLayout/>
    </s:layout>
    <fx:Script>
        <![CDATA[
            import com.flex.event.MyEvent;
 
            import mx.controls.Alert;
            import mx.events.FlexEvent;
 
            protected function application1_creationCompleteHandler(event:FlexEvent):void
            {
                this.addEventListener(MyEvent.MYEVENT,eventHindler);
            }
            //自定义函数
              private function eventHindler(e:MyEvent):void{
                Alert.show("事件响应结果："+e.getEventObj(),"提示");
            }
 
            protected function button1_clickHandler(event:MouseEvent):void
            {
                var evt:MyEvent = new MyEvent(MyEvent.MYEVENT,122);
                dispatchEvent(evt); //将事件发送出去
              }
 
        ]]>
    </fx:Script>
    <fx:Declarations>
 
    </fx:Declarations>
    <s:Button x="93" y="59" label="click me" click="button1_clickHandler(event)"/>
</s:Application>

　　MyEvent类定义：

　　

package com.flex.event
{
    import flash.events.Event;
 
    public class MyEvent extends Event
    {
        public static const MYEVENT:String="myevent";
        private var eventObj:int;
        public function MyEvent(type:String, i:int,bubbles:Boolean=false, cancelable:Boolean=false)
        {
            super(type, bubbles, cancelable);
            this.eventObj=i;
        }
        public function getEventObj():int{
            return this.eventObj;
        }
    }
}