From: Its Me <itsme213@...>
Date: 2004-04-26T12:09:05+09:00
Subject: Re: tk: how to dynamically remove / add widgets?

Perfect! Thank you very much.

I don't have rdoc documentation working so this is more guesswork that it
should be.

"Hidetoshi NAGAI" <nagai@ai.kyutech.ac.jp> wrote in message
> I intend to show that a callback for a widget can control another
> widget. In other words, you can pack/unpack some widgets in a
> callback procedure. If you hate the frame size is changed when packing
> some widgets in the frame, you must set TkPack.propagate to false.
> Please see the following sample script, and compare the difference
> of propagate mode (true/false).
> -----------------------------------------------------------
> #!/usr/bin/env ruby
> require 'tk'
>
> TkLabel.new(:text=>"Please click the bottom frame").pack
>
> f = TkFrame.new(:width=>400, :height=>100, :background=>'yellow',
> :relief=>'ridge', :borderwidth=>5).pack
>
> TkPack.propagate(f, false)  # <== important!!
>
> list = (1..3).collect{|n|
>   TkButton.new(f, :text=>"button-#{'X'*n}"){
>     command proc{
>       puts "button-#{'X'*n}"
>       self.unpack
>     }
>   }
> }
>
> f.bind('1', proc{
> w = list.shift
> w.unpack
> list.push(w)
> list[0].pack(:anchor=>:center)
>        })
>
> Tk.mainloop
> -----------------------------------------------------------
> -- 
>                                   Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
>
>