From: Albert Schlef <albertschlef@...>
Date: 2009-02-03T17:59:35+09:00
Subject: A Tk window

I have a program that run in the terminal. But once in a while I need it
to bring up a window (GUI) with some information (and interactive
widgets).

So I do:

  root = TkRoot.new
  .....set up the window.....
  Tk.mainloop

This works. Then the user closes the window and the program continues
running.

HOWEVER, the next time I try to bring up the window, Tk gives the
following error:

  can't invoke "frame" command:  application has been destroyed
(RuntimeError)

(I also tried with TkToplevel instead of TkRoot.)

How can I solve this problem?

I looked into the source code of '/ext/tk/lib/dialog.rb', thinking
perhaps TkDialog is what I need. I tried the following code:

  class MyDialog < TkDialog
    def initialize(*args)
      super(*args)
      TkLabel.new(self, :text => 'this is a test').pack
    end
  end

  MyDialog.new :title => 'something'

Now, this is already an improvement because I can call MyDialog.new()
again and again without Tk telling me that the "application has been
destroyed". HOWEVER, I can't put my own widgets in the dialog: my 'this
is a test' label doesn't show up...
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