From: nagai@...
Date: 2003-01-31T11:03:30+09:00
Subject: Re: TkListbox -- binding an entry

Hi, 

From: Daniel Carrera <dcarrera@math.umd.edu>
Subject: TkListbox -- binding an entry
Date: Fri, 31 Jan 2003 07:46:33 +0900
Message-ID: <20030130224627.GA2517@math.umd.edu>
> I have a TkListbox, and I'd like to take an action when the user clicks on 
> a list entry.  There are two ways that this might be possible:
> *  Bind each entry to a callback.
> *  Bind the list box to a callback and then find the entry that is 
> highlighted.

I recommend you to use TkListbox#nearest method and 
binding to listbox widget. A sample script is here.
-----------------------------------------------------
#!/usr/bin/env ruby
require 'tk'

f = TkFrame.new.pack

lbox = TkListbox.new(f,'selectmode'=>'multiple').pack('side'=>'left')

['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff', 'ggg', 
 'hhh', 'iii', 'jjj', 'kkk', 'lll', 'mmm', 'nnn'].each{|term|
  lbox.insert 'end',term
}

lbox.yscrollbar(TkScrollbar.new(f).pack('side'=>'left', 'fill'=>'y'))

tag = TkBindTag.new
lbox.bindtags(lbox.bindtags.unshift(tag))
tag.bind('Button-1', 
         proc{|w,y| 
           p w.get(w.nearest(y))
           Tk.callback_break   # block original binding of listbox widget
         }, '%W %y')

Tk.mainloop
-------------------------------------------------
-- 
                                  Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)