Thank you for your code,
but my problem is not the singleton implementation but how to make a
binding on a singleton (watch the changes of the _instance value...)
In fact to make a binding on a static property ??
{Maz}
> 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 [email protected], "gotjosh819i" <joshuaprodgers@>
> 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 [email protected], "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: [email protected]
> > [mailto:[EMAIL PROTECTED] On
> > > > Behalf Of ecpmaz
> > > > Sent: Monday, May 07, 2007 7:31 AM
> > > > To: [email protected]
> > > > 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}
> > > >
> > >
> >
>
