Accessing Variables from Outside class.

How do access variables from outside a class? I generated
variables within a
class, but I can't access them from other classes, and I
want to keep a
tally that exists outside a single class. Please help, I
spent 8 hours today
looking for ways to access this correctly, and nothing
works. Not
getChildByName, since that only lets me access properties,
and I need to
access variables. Thanks.

-- 
~ Elmer Tucker
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When you have a public variable in class A that you want to
access in class
B you just create an instance of A inside B:

// A.as
class A{
	var someVar:Number;
	function A(){
		someVar = 77;
	}
}
----------------------------
// B.as
class B{
	var a:A;
	function B(){
		a = new A();
		trace(a.someVar);
	}
}
-----------------------------
// testB.fla
var b:B = new B();

hth
-------------
Andreas Weber



-----Ursprüngliche Nachricht-----
Von: flashnewbie-bounceschattyfig.figleaf.com
[mailto:flashnewbie-bounceschattyfig.figleaf.com]Im
Auftrag von Elmer
Tucker
Gesendet: Freitag, 13. Juli 2007 09:06
An: flashnewbiechattyfig.figleaf.com
Betreff: [Flashnewbie] Accessing Variables from Outside
class.


How do access variables from outside a class? I generated
variables within a
class, but I can't access them from other classes, and I
want to keep a
tally that exists outside a single class. Please help, I
spent 8 hours today
looking for ways to access this correctly, and nothing
works. Not
getChildByName, since that only lets me access properties,
and I need to
access variables. Thanks.

--
~ Elmer Tucker
_______________________________________________
Flashnewbiechattyfig.figleaf.com
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_______________________________________________
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On 7/13/07, Elmer Tucker <elmer.tuckergmail.com> wrote:
> How do access variables from outside a class? I
generated variables within a
> class, but I can't access them from other classes, and
I want to keep a
> tally that exists outside a single class. Please help,
I spent 8 hours today
> looking for ways to access this correctly, and nothing
works. Not
> getChildByName, since that only lets me access
properties, and I need to
> access variables. Thanks.

Not recommended is to make them public:

class Foo {
   public var foobar : String;
   ...
}

A better way is to use a getter/setter:

class Foo {
   var _foobar : String;
   public function get foobar () : String {
      return _foobar;
   }
   public function set foobar ( s : String ) : Void {
      _foobar = s;
   }
   ...
}

Of course, you need a reference to the class instance who's
variables
you want to access:

class Bar {
   var foo : Foo;
   public function Bar ( f : Foo ) {
      foo = f;
   }
   ...
}

Does that solve your problem? Otherwise you will have to be
more specific.

Mark
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On 7/13/07, Andreas Weber <webwebergmail.com> wrote:
> When you have a public variable in class A that you
want to access in class
> B you just create an instance of A inside B:
>
> // A.as
> class A{
>         var someVar:Number;
>         function A(){
>                 someVar = 77;
>         }
> }

If a variable always has the same value, make it static:

class Foo {
   static var foobar : String = "Foo. Bar.
Happiness.";
}

...and access it as Foo.foobar.

Mark
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Agreed, only make class variables public if you have to (for
example, if
you are using a class that has to have public variables
stated, like
EventDispatcher).  Otherwise, I always make all my class
variables
private and use getters and setters.

Jason Merrill
Bank of America  
GT&O Learning & Leadership Development
eTools & Multimedia Team


 

>>-----Original Message-----
>>From: flashnewbie-bounceschattyfig.figleaf.com 
>>[mailto:flashnewbie-bounceschattyfig.figleaf.com] On
Behalf 
>>Of Mark Winterhalder
>>Sent: Friday, July 13, 2007 8:13 AM
>>To: Flashnewbie Mailing List
>>Subject: Re: [Flashnewbie] Accessing Variables from
Outside class.
>>
>>On 7/13/07, Elmer Tucker <elmer.tuckergmail.com> wrote:
>>> How do access variables from outside a class? I
generated variables 
>>> within a class, but I can't access them from
other classes, 
>>and I want 
>>> to keep a tally that exists outside a single
class. Please help, I 
>>> spent 8 hours today looking for ways to access
this correctly, and 
>>> nothing works. Not getChildByName, since that
only lets me access 
>>> properties, and I need to access variables.
Thanks.
>>
>>Not recommended is to make them public:
>>
>>class Foo {
>>   public var foobar : String;
>>   ...
>>}
>>
>>A better way is to use a getter/setter:
>>
>>class Foo {
>>   var _foobar : String;
>>   public function get foobar () : String {
>>      return _foobar;
>>   }
>>   public function set foobar ( s : String ) : Void
{
>>      _foobar = s;
>>   }
>>   ...
>>}
>>
>>Of course, you need a reference to the class
instance who's 
>>variables you want to access:
>>
>>class Bar {
>>   var foo : Foo;
>>   public function Bar ( f : Foo ) {
>>      foo = f;
>>   }
>>   ...
>>}
>>
>>Does that solve your problem? Otherwise you will
have to be 
>>more specific.
>>
>>Mark
>>_______________________________________________
>>Flashnewbiechattyfig.figleaf.com
>>To change your subscription options or search the
archive:
>>http://chattyfig.figleaf.com/mailman/listinfo/flashnewb
ie
>>
>>Brought to you by Fig Leaf Software
>>Premier Authorized Adobe Consulting and Training 
>>http://www.figleaf.com http://training.figleaf.c
om
>>
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On 7/13/07, Kerry Thompson <alphacyberiantiger.biz>
wrote:
> A static variable isn't guaranteed to never change. It
probably won't, but
> it's really easy to change from the outside, given
access.

Yeah, the point I was trying to make was that it's
preferable to the
use case Andreas suggested.

> I get around this by naming things I want to stay with
all caps. That's a
> standard across a lot of languages saying "this is
a constant--don't change
> it, even if you can".

Yup, I do that, too. I use haXe instead of ActionScript,
there I can
easily set access to properties:

class Foo {
   var bar (default, null) : String;
}

...declared an instance variable 'bar' that can be read from
outside
the class ('default'), but only written from the inside
('null' -- no
setter method). If I wanted to use getters/setters, I'd
write the
respective method name instead of default/null. That way, I
can
restrict access without having the overhead of a function
call, and if
the need arises during development, I can still add a setter
method
without having to change the interface.
That's just one of the haXe goodies (the type system, oh the
type
system!), but I wouldn't necessarily recommend haXe to those
who
aren't familiar and comfortable with OOP practices. It's
pretty
strict.

Mark
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