From: Robert Klemme <shortcutter@...>
Date: 2011-12-08T19:53:21+09:00
Subject: Re: Using any trick to omit () in constant lookup?

On Thu, Dec 8, 2011 at 10:35 AM, Hans Mackowiak <hanmac@gmx.de> wrote:
> or an idea, forgot your Button class, and override const_missing

There is a much simpler solution

require 'gtk2'

$use_gtk = true

def Button
 if $use_gtk
   Gtk::Button
 else # else use something else.
   raise "unknown"
 end.new
end

x = Button
puts x.class

But the problem will come later, i.e. when using all those toolkit
instances.  They most likely have different interfaces.  So you better
wrap all the classes with your own classes which exhibit a standard
interface (which you must define) and work with specific toolkit
classes behind the scenes.  The ugly thing then will be to find the
way back from a toolkit class to its corresponding wrapper.  Another
option could be to add methods to toolkit classes to create the
uniform interface.

I am not sure whether all the effort pays off though...

Cheers

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/