1.方式一：通过继承Event类编写Flex4的自定义事件
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下面我们来做一个例子，实现这样的功能：监控TextInput的输入，通过监控输入的内容，触发不同的自定义事件。
我们先来写这个自定义事件：
ActionScript类Test43Event.cs
packagedemo
?????????????? ?importflash.events.Event;
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????public class Test43Event extends Event |
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????????public static var Test43_Number:String = "number"; |
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????????public static var Test43_Letter:String = "letter"; |
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????????public static var Test43_Other:String = "other"; |
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????????public function Test43Event(type:String,bubbles:Boolean=false,??????????????cancelable:Boolean=false) |
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????????????super(type,bubbles,cancelable); |
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然后添加一个MXML应用程序test43.mxml调用这个自定义事件
???????? <?xml version="1.0" encoding="utf-8"?>
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<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"? |
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???????????????xmlns:s="library://ns.adobe.com/flex/spark"? |
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???????????????xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" creationComplete="application1_creationCompleteHandler(event)"> |
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????????<s:BasicLayout/> |
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????????????import mx.events.FlexEvent; |
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????????????protected function textinput1_keyDownHandler(event:KeyboardEvent):void |
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????????????????var test43Event:Test43Event; |
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????????????????if(event.keyCode>=48 && event.keyCode<=57)??? //0-9 |
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????????????????????test43Event = new Test43Event(Test43Event.Test43_Number); |
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????????????????????dispatchEvent(test43Event); |
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????????????????else if(event.keyCode>=65 && event.keyCode<=90)?? //a-z A-Z |
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????????????????????test43Event = new Test43Event(Test43Event.Test43_Letter); |
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????????????????????dispatchEvent(test43Event); |
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????????????????????test43Event = new Test43Event(Test43Event.Test43_Other); |
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????????????????????dispatchEvent(test43Event); |
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????????????private function func1(event:Event):void |
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????????????????if(event.type==Test43Event.Test43_Letter) |
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????????????????????msg.text = "当前输入的是字母"; |
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????????????????else if(event.type==Test43Event.Test43_Number) |
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????????????????????msg.text = "当前输入的是数字"; |
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????????????????else if(event.type==Test43Event.Test43_Other) |
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????????????????????msg.text = "当前输入的是其他字符"; |
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????????????protected function application1_creationCompleteHandler(event:FlexEvent):void |
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????????????????this.addEventListener(Test43Event.Test43_Letter,func1); |
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????????????????this.addEventListener(Test43Event.Test43_Number,func1); |
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????????????????this.addEventListener(Test43Event.Test43_Other,func1); |
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????????<!-- 将非可视元素（例如服务、值对象）放在此处 --> |
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????<s:TextInput id="text1" x="140" y="157" keyDown="textinput1_keyDownHandler(event)"/> |
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????<s:Label id="msg" x="140" y="128"/> |
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2.方式二：直接使用dispatchEvent编写Flex4的自定义事件
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<?xml version="1.0" encoding="utf-8"?> |
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<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"? |
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???????????????xmlns:s="library://ns.adobe.com/flex/spark"? |
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???????????????xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" creationComplete="application1_creationCompleteHandler(event)"> |
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????????<s:BasicLayout/> |
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????????????import mx.events.FlexEvent; |
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????????????protected function application1_creationCompleteHandler(event:FlexEvent):void |
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????????????????this.addEventListener("Letter",func1); |
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????????????????this.addEventListener("Other",func1); |
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????????????private function func1(event:Event):void |
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????????????????if(event.type == "Letter") |
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????????????????????msg.text = "当前选择的是字母"; |
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????????????????????msg.text = "当前选择的不是字母"; |
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????????????protected function textinput1_keyDownHandler(event:KeyboardEvent):void |
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????????????????if(event.keyCode>=65 && event.keyCode<=90)??? //a-z A-Z |
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????????????????????dispatchEvent(new Event("Letter")); |
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????????????????????dispatchEvent(new Event("Other")); |
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????????<!-- 将非可视元素（例如服务、值对象）放在此处 --> |
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????<s:TextInput x="180" y="179" keyDown="textinput1_keyDownHandler(event)"/> |
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????<s:Label x="179" y="143" id="msg"/> |
