From: NetManiac <rugowski@...>
Date: 2007-08-21T21:15:05+09:00
Subject: TkTimer and calling own methods from handler

Hi!
I'm experimenting with Ruby Tcl/Tk and I've got stuck with timers. I
reduced my problem to following example:

#!/usr/bin/env ruby
require "tk"

def advance
  button.text = global_var.to_s
  global_var += 1
end

global_var = 0

root = TkRoot.new(:title=>'Example')
button = TkButton.new(root) {
  text "button"
}
button.pack("side"=>"right", "fill"=>"y")
tick = proc{|aobj|
  advance
}
timer = TkTimer.new(250, -1,tick )
timer.start(0)

Tk.mainloop()

I want this code to increase number displayed on button, but does not
work. When I change timer definition to:

tick = proc{|aobj|
   button.text = global_var.to_s
  global_var += 1
}

It does work, so it looks like I need to call my own method some
special way? I have examined examples in Ruby source code, but all of
them operates without wrapping code in own methods (I suppose to make
it easier to understand).

So how I should call own methods?

--
Witold Rugowski
http://nhw.pl/wp/ (EN blog)
http://FriendsFeedMe.com