issue in my sample:
replace _user with testClass (should be _testClass)
I forgot to make a couple changes (was using some code from a project
as a sample)
--- In flexcoders@yahoogroups.com, "gotjosh819i" <[EMAIL PROTECTED]>
wrote:
>
> Seems you are missing the constructor that actually performs the
> singleton protection, Here is an example of one way to create a
> singleton class (there are others):
>
>
> ************=================================***********
> package com.somefolder.vo
> {
>
> [Bindable] public class TestClass
> {
>
> private static var testMe: TestClass;
>
> public var user_bemsid:Number = 0;
> public var user_fname:String = "";
> public var user_lname:String = "";
> public var user_mname:String = "";
>
>
> // singleton: constructor only allows one user
> public function TestClass() : void {
> if ( _user != null ) {
> throw new Error( "Only one TestClass
> instance can be instantiated" );
> }
>
> }
>
> // singleton: always returns the one existing static
> instance to itself
> public static function getInstance() : TestClass {
> if ( _user == null ) {
> _user = new TestClass();
> }
> return _user;
> }
>
>
> }
> }
>
> ************=================================*******
>
> This is an example of how you init the class, if you try to init it
> more then once it will throw an error:
>
> import com.somefolder.TestClass;
> [Bindable] public var testModel : TestClass = TestClass.getInstance
();
>
>
>
> I would recommend looking into Cairngorm as it utilizes many design
> patterns that fix many issues you will run into as a developer
using
> Flex.
>
> --- In flexcoders@yahoogroups.com, "ecpmaz" <ecpmaz@> wrote:
> >
> > Thank you for your answer, but it leads to the same behavior..
> >
> > In my implementation, the Singleton is created the first time
> > TestClass' constructor is called (subsequent calls replaces
instance
> > by a new one)
> >
> > {Maz}
> >
> > >
> > > I don't see how your Singleton ever gets initialized.
> > >
> > > Did you try this:
> > >
> > > =======
> > >
> > > public static function get instance():TestClass {
> > > if(_instance == null){
> > > _instance = new TestClass();
> > > }
> > > return _instance;
> > > }
> > >
> > > ========
> > >
> > > Jim
> > >
> > > ________________________________________
> > > From: flexcoders@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On
> > > Behalf Of ecpmaz
> > > Sent: Monday, May 07, 2007 7:31 AM
> > > To: flexcoders@yahoogroups.com
> > > Subject: [flexcoders] Binding on a singleton
> > >
> > > Hi,
> > >
> > > I have a class implemented as a Singleton that get's
initialized
> at
> > > any time (unknown...)
> > >
> > > -------------
> > > public class TestClass extends EventDispatcher {
> > >
> > > private static var _instance:TestClass;
> > > private static var currentIndex:int = 0;
> > > [Bindable] public var value:int;
> > >
> > > public function TestClass() {
> > > super();
> > > _instance = this;
> > > _instance.value = currentIndex++;
> > > dispatchEvent(new Event("instanceChanged"));
> > > }
> > >
> > > [Bindable(event="instanceChanged")]
> > > public static function get instance():TestClass {
> > > return _instance;
> > > }
> > >
> > > public override function toString):String {
> > > return "TestClass" + value;
> > > }
> > > }
> > > --------------
> > >
> > > I want any class to be able to monitor TestClass' instance
> change...
> > > How would I do that. I tried many things, all without results..
> > > I would like to use it like that for instance :
> > >
> > > --------------
> > > <mx:Label text="{TestClass.instance.toString()}" />
> > > <mx:Button click="new TestClass()" /> <!-- hoping to chg Label's
> > text -->
> > > --------------
> > >
> > > How would you do that ?
> > >
> > > {Maz}
> > >
> >
>
