From: Aldric Giacomoni <"aldric[remove]"@...>
Date: 2009-02-03T22:29:43+09:00
Subject: Re: A Tk window

Albert Schlef wrote:
> 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...
>   
Cheat, override the 'close' button and make it hide the window instead?