From: Martin DeMello <martindemello@...>
Date: 2005-01-18T14:21:04+09:00
Subject: Re: Fwd: [suby-ruby] Your all time desired fundemental Ruby mod

"trans.  (T. Onoma)" <transami@runbox.com> wrote:
> On Monday 17 January 2005 02:51 am, Martin DeMello wrote:
> |
> | I can think of at least one good us for the current @@ variables -
> | subclassable GUI components that inherit hierarchy-shared look-and-feel
> | properties from the parent class. What would be the elegant way to do
> | this if @@ variables go per-class?
> 
> You would have to do it via class instance vars. The problem with these IMHO 
> is still the intialization issue, as with modules (see ruby-talk:121611, 
> http://urltron.com/nd) Matz, do you think we can get something in the way of 
> remedying that? For me it's one of the biggest sores in my code.

How?

class Button
  @@background = BLUE
  
  def repaint
    @background = @@background
    ...
  end
end

class ImageButton < Button
end

Now if @@background were changed to Button.@background, how would
repaint work in ImageButton?

martin