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" <[EMAIL PROTECTED]> 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}
> >
>
