mx.core.Singleton is internal class in FlexFramework. I don't know Adobe supports mx.core.Singleton officially or not. Also FlexFrameworks's Singleton isn't like Java's because AS3 doesn't support Singleton. Also you don't need to use Singleton. I just show a way to use mx.core.Singleton.


SingletonSampleForFlex2.mxml

<?xml version="1.0" encoding="utf-8"?> <mx:Application layout="vertical" xmlns:mx="http://www.adobe.com/2006/mxml" viewSourceURL="srcview/index.html"> <mx:Script> <![CDATA[ import mx.core.Singleton; import org.pepe.managers.IFooManager; import org.pepe.managers.IHogeManager; private function helloHandler():void { var cName:String = "org.pepe.managers::HogeManager"; // This doesn't need. // But you can check which Class is registered or not var c:Class = Singleton.getClass(cName); // get instance var hoge:IHogeManager = Singleton.getInstance(cName) as IHogeManager; hoge.sayHello(); } private function goodByeHandler():void { var cName:String = "org.pepe.managers::FooManager"; // This doesn't need. // But you can check which Class is registered or not var c:Class = Singleton.getClass(cName); // get instance var foo:IFooManager = Singleton.getInstance(cName) as IFooManager; foo.sayGoodBye(); } ]]> </mx:Script> <mx:Label text="Singleton Sample for Flex 2.0.1" fontSize="26" fontWeight="bold" /> <mx:Spacer height="20" /> <mx:HBox> <mx:Button label="Hello" click="helloHandler()" /> <mx:Button label="GoodBye" click="goodByeHandler()" /> </mx:HBox> </mx:Application>


You have to register classes to Singleton before you use it. About Mixin metadata, See The [Transient] and [Mixin] metadata tags.
org.pepe.managers.AppBootstrap (AS3)

package org.pepe.managers { import flash.utils.getDefinitionByName; import mx.core.Singleton; import mx.managers.ISystemManager; import mx.utils.ObjectUtil; [Mixin] public class AppBootstrap { // SystemManager call this function // before Application initialize public static function init(sm:ISystemManager):void { // set a break point here and try to debug:) trace(ObjectUtil.toString(sm.info())); // register Class info to Singleton class Singleton.registerClass( "org.pepe.managers::HogeManager", Class(getDefinitionByName("org.pepe.managers::HogeManager")) ); Singleton.registerClass( "org.pepe.managers::FooManager", Class(getDefinitionByName("org.pepe.managers::FooManager")) ); } private var _hoge:HogeManager; // for compiler private var _foo:FooManager; // for compiler public function AppBootstrap() { super(); } } }


org.pepe.managers.HogeManager (AS3)

package org.pepe.managers { import flash.events.EventDispatcher; import flash.events.IEventDispatcher; import mx.controls.Alert; public class FooManager extends EventDispatcher implements IFooManager { private static var _instance:FooManager; // Singleton call this function public static function getInstance():FooManager { if(!_instance){ _instance = new FooManager(); } return _instance; } public function FooManager(target:IEventDispatcher=null) { super(target); } public function sayGoodBye():void { Alert.show("GoodBye", "FooManager"); } } }


You have to add compiler option like below.
"-load-config+=config/custom-config.xml"

custom-config.xml




SingletonSampleForFlex2
source of SingletonSampleForFlex2


SingletonSampleForFlex3
source of SingletonSampleForFlex3


BTW, on Japanese environment, css definition of source view is output in Japanese. Therefore, source view doesn't work correctly.

标签：Singleton  flex2  flex3  as3  
分类目录: 资料 | 作者: dzq @ 2007-12-20 15:52:26