【翻译】How to use mx.core.Singleton (Flex2.0.1/Flex3)

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<hbox><br><button label="Hello" click="helloHandler()"></button> <br><button label="GoodBye" click="goodByeHandler()"></button> <br></hbox>





You have to register classes to Singleton before you use it. About Mixin metadata, See The [Transient] and [Mixin] metadata tags.

在使用之前，你必须将你的类注册到singleton至于MIXIN元标签，可以参看相应的链接
org.pepe.managers.AppBootstrap (AS3)

packageorg.pepe.managers
{
 importflash.utils.getDefinitionByName;

 importmx.core.Singleton;
 importmx.managers.ISystemManager;
 importmx.utils.ObjectUtil;

[Mixin]
 publicclassAppBootstrap
{

 //SystemManagercallthisfunction
 //beforeApplicationinitialize
 publicstaticfunctioninit(sm:ISystemManager):void
{
 //setabreakpointhereandtrytodebug:)
 trace(ObjectUtil.toString(sm.info()));

 //registerClassinfotoSingletonclass
Singleton.registerClass(
 "org.pepe.managers::HogeManager",
 Class(getDefinitionByName("org.pepe.managers::HogeManager"))
);
Singleton.registerClass(
 "org.pepe.managers::FooManager",
 Class(getDefinitionByName("org.pepe.managers::FooManager"))
);
}


 privatevar_hoge:HogeManager;//forcompiler
 privatevar_foo:FooManager;//forcompiler

 publicfunctionAppBootstrap()
{
 super();
}

}
}

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


org.pepe.managers.HogeManager (AS3)

packageorg.pepe.managers
{
 importflash.events.EventDispatcher;
 importflash.events.IEventDispatcher;

 importmx.controls.Alert;

 publicclassFooManagerextendsEventDispatcherimplementsIFooManager
{
 privatestaticvar_instance:FooManager;

 //Singletoncallthisfunction
 publicstaticfunctiongetInstance():FooManager
{
 if(!_instance){
 _instance=newFooManager();
}

 return_instance;
}


 publicfunctionFooManager(target:IEventDispatcher=null)
{
 super(target);
}

 publicfunctionsayGoodBye():void
{
 Alert.show("GoodBye","FooManager");
}

}
}

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


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

你必须加上上面的这行编译器选项

custom-config.xml

<?xml version=<SPAN style="COLOR: #0000ff">"1.0"?>
<flex-config xmlns="&lt;SPAN" style="COLOR: #0000ff">"<a href="http://www.adobe.com/2006/flex-config" target="_blank">http://www.adobe.com/2006/flex-config</a>"&gt;<br><br><span style="COLOR: #000080"><symbol></symbol></span>org.pepe.managers.AppBootstrap<span style="COLOR: #000080"></span><br><span style="COLOR: #000080"><span style="COLOR: #ff8000"></span></span><br></flex-config>

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.

本文转自
http://shigeru-nakagaki.com/index.cfm/2007/12/19/20071220-How-to-use-mx-core-Singleton