flex 自定义事件

给自定义组件编写事件，可以分为3部分：

1、自定义事件，

events.LightEvent.as

 1 package events
 2 {
 3     import flash.events.Event;
 4     
 5     public class LightEvent extends Event
 6     {
 7         public static const LightClick:String = "LightClick";
 8         
 9         public function LightEvent(type:String, bubbles:Boolean=false, cancelable:Boolean=false)
10         {
11             super(type, bubbles, cancelable);
12         }
13         
14         private var _color: String;
15 
16         public function get color():String
17         {
18             return _color;
19         }
20 
21         public function set color(value:String):void
22         {
23             _color = value;
24         }
25         
26         public override function clone():Event
27         {
28             var le:LightEvent = new LightEvent(type, bubbles, cancelable);
29             le.color = color;
30             return le;
31         }
32 
33     }
34 }

2、在自定义组件上注册事件

Components.Light.mxml

<?xml version="1.0" encoding="utf-8"?>
<s:HGroup 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="319" height="45" horizontalAlign="center" verticalAlign="middle">
    
    <fx:Metadata>
        [Event(name="LightClick", type="events.LightEvent")]
    </fx:Metadata>
    
    <fx:Script>
        <![CDATA[
            import events.LightEvent;
            
            protected function button1_clickHandler(event:MouseEvent, color:String):void
            {
                var eventObj:LightEvent = new LightEvent(LightEvent.LightClick);
                eventObj.color = color;
                dispatchEvent(eventObj);
            }
            
            protected function button2_clickHandler(event:MouseEvent):void
            {
                var eventObj:LightEvent = new LightEvent(LightEvent.LightClick);  //这里一定跟上面[Event(name="LightClick", ...)]，使用的name相同，否则，派发的事件不会被接收到                eventObj.color = Button(event.target).label;
                dispatchEvent(eventObj);
            }]]>
    </fx:Script>
    
    
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
    </fx:Declarations>
    
    <s:Button label="红色" click="button1_clickHandler(event, 'red')"/>
    <s:Button label="蓝色" click="button2_clickHandler(event)"/>
    <s:Button label="绿色" click="button2_clickHandler(event)"/>
    
</s:HGroup>

3、使用自定义事件

TestLightEvent.mxml

<?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" minWidth="955" minHeight="600" xmlns:Components="Components.*"
               fontFamily="宋体">
    <fx:Script>
        <![CDATA[
            import events.LightEvent;
            
            protected function light1_lightHandler(event:LightEvent):void
            {
                // TODO Auto-generated method stub
                lblColor.text = event.color;
            }
            
        ]]>
    </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 x="55" y="51" width="290" height="151">
        <s:Label id="lblColor" x="132" y="38" text="关闭"/>
        <Components:Light x="0" y="63" width="288" LightClick="light1_lightHandler(event)"/>
    </s:Panel>
                          
</s:Application>

好了，就是这些，比较简单吧，其实就是上面事件派发的名字，在这个例子里就是LightEvent.LightClick，一定要写得一致哦