RE: [flexcoders] as3 global variables - no more

[Merrill, Jason]

Global is bad and went directly against OOP.  To do it right, you want
your component to broadcast an event, and the other componet to listen
for that event and then call another method when the event is heard.
 

Jason Merrill 
Bank of America 
GT&O L&LD Solutions Design & Development 
eTools & Multimedia 

Bank of America Flash Platform Developer Community 


Are you a Bank of America associate interested in innovative learning
ideas and technologies?
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 . 




 




From: flexcoders@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of dsds99
Sent: Friday, February 22, 2008 1:42 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] as3 global variables - no more



Yes, using global variables was easy solution to referencing
movieclips from anywhere.

I'm trying to link up my play button to play the selected track
in a
listbox. The two components are in separate classes.

one solution is that in my main class I pass a reference of the
listbox to my playbutton.

Are there alternative solutions to this...Better OOP practice.



 

RE: [flexcoders] as3 global variables - no more

[Tracy Spratt]

Events are the preferred solution, but from anywhere in an app,
including swfs loaded using SWFLoader, you can access any public member
in the main application scope doing:

Import mx.core.Application;

Then:

var myVar:String = Application.application.publicStringVarInMainApp;
//works for public functions and components too.

 

I typically create a var, _app:Application, to shorten the code.  If you
type _app to the exact class (file name) of the main app, you will get
the benefits of code hinting in FB.

 

Tracy

 

 



From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Paul Andrews
Sent: Friday, February 22, 2008 1:50 PM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] as3 global variables - no more

 

- Original Message - 
From: "dsds99" <[EMAIL PROTECTED] <mailto:dsds99%40yahoo.com> >
To: mailto:flexcoders%40yahoogroups.com> >
Sent: Friday, February 22, 2008 6:41 PM
Subject: [flexcoders] as3 global variables - no more

> Yes, using global variables was easy solution to referencing
> movieclips from anywhere.
>
> I'm trying to link up my play button to play the selected track in a
> listbox. The two components are in separate classes.
>
> one solution is that in my main class I pass a reference of the
> listbox to my playbutton.
>
> Are there alternative solutions to this...Better OOP practice.

I thin k you either have a class missing, or the wrong push button
class.

The button gets pressed and should fire off an event. In your
application 
there needs to be a class that responds to the pushbutton. That class is

also aware of the list, so it can know the button is pressed then access
the 
current item on the list and activate the playing.

A method of this application class can be called by the buttons click 
handler..

Paul 

 

Re: [flexcoders] as3 global variables - no more

[Aaron Miller]

One way is to use singleton classes.


# package pkg {
#
# public class SingletonClass  {
#
#  public var someVar:String = 'Hello World';
#
#   //singleton instance makes sure there is only one instance of the class
#   static private var myInstance:SingletonClass;
#
#   public function SingletonClass( singletonEnforcer:SingletonEnforcer ){}
#
#   //returns an instance to the node and enforces singleton class
#   public static function getInstance( ): SingletonClass  {
#
# if( SingletonClass .myInstance == null )
#   SingletonClass.myInstance = new SingletonClass( new
SingletonEnforcer() );
#
# return SingletonClass.myInstance;
#   }
#
# }
# }
#
#
# //publicly inacsessable dummy class used to enforce signleton
# class SingletonEnforcer { }

Your class instance could then be accessed anywhere in the application with:

# import pkg.SingletonClass;
#
# trace( SingletonClass.getInstance().someVar );

Regards,
~Aaron

On 2/22/08, dsds99 <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
>
> Yes, using global variables was easy solution to referencing
> movieclips from anywhere.
>
> I'm trying to link up my play button to play the selected track in a
> listbox. The two components are in separate classes.
>
> one solution is that in my main class I pass a reference of the
> listbox to my playbutton.
>
> Are there alternative solutions to this...Better OOP practice.
>
> 



-- 
Aaron Miller
Chief Technology Officer
Splash Labs, LLC.
[EMAIL PROTECTED]  |  360-255-1145
http://www.splashlabs.com

Re: [flexcoders] as3 global variables - no more

[Paul Andrews]

- Original Message - 
From: "dsds99" <[EMAIL PROTECTED]>
To: 
Sent: Friday, February 22, 2008 6:41 PM
Subject: [flexcoders] as3 global variables - no more


> Yes, using global variables was easy solution to referencing
> movieclips from anywhere.
>
> I'm trying to link up my play button to play the selected track in a
> listbox. The two components are in separate classes.
>
> one solution is that in my main class I pass a reference of the
> listbox to my playbutton.
>
> Are there alternative solutions to this...Better OOP practice.

I thin k you either have a class missing, or the wrong push button class.

The button gets pressed and should fire off an event. In your application 
there needs to be a class that responds to the pushbutton. That class is 
also aware of the list, so it can know the button is pressed then access the 
current item on the list and activate the playing.

A method of this application class can be called by the buttons click 
handler..

Paul