From: "Albert L. Wagner" <alwagner@...>
Date: 2002-03-28T00:50:29+09:00
Subject: Re: Error calling Tk in a loop

There really should be only one instance of TkRoot.  That's why
it's called Root.
Tk.mainloop should only be called once.  The code below is still
wrong because TkRoot is called 3 times.  the second two calls are
apparently ignored. I tried to leave it as close to what you had
as possible, but the statement root = TkRoot... should really be
in Main.initialize.  Tk is event driven.  You need to capture
some mouse/keyboard events in Main that popup your alert box in
the callback. You haven't defined an alert box, but rather the
main application window and three labels to that window.

require 'tk'

class AlertBox
	def initialize( caption, box_text )
		root = TkRoot.new { title caption }
		TkLabel.new(root) {
		text  box_text
		pack  { padx 25 ; pady 25; side 'left' }
		}
  	end
end

class Main
	def initialize
		1.upto(3){ |x|
			AlertBox.new( "Alert #{x}", "This is #{x}")
			}
	end
end

if __FILE__ == $0
Main.new
Tk.mainloop
end
-- 
"It requires wisdom to understand wisdom:
 the music is nothing if the audience is deaf."
 - Walter Lippman