From: Markus Liebelt <markus.liebelt@...>
Date: 2005-06-28T23:05:40+09:00
Subject: Problem in binding IWidget combobox to event

Hello all together,

I managed lately to include an iwidget combobox in a UI I have written. If  
normally used (by poking around with the mouse) everything works fine.  
What I cannot manage if the user is using the keyboard.

Can anyone tell me how to bind the key  events to the iwidget components  
especially to the combobox?

My example goes like this (sorry for the lengthy boring example):
====================
require 'tk'
require 'tkextlib/iwidgets'

class Ex_Combo
   def open
     root = self.create_root
     self.build_form(root)
     Tk.mainloop
   end
   def build_form(root)
     frame = self.create_frame(:form, root)
     var = TkVariable.new
     cb1 = Tk::Iwidgets::Combobox.new(frame, #:labeltext=>'Example:',
            :selectioncommand=>proc{puts cb1.get_curselection;  
$stdout.flush},
            :textvariable=>var,
            :editable=>false)
     cb1.insert_list('end', *['First entry','Second entry','Third entry'])
     cb1.grid('row'=>0, 'column'=>0, 'sticky'=>'news')
     frame.pack('side'=>'left', 'expand'=>'yes')
   end
   def create_frame(name, super_widget, *args)
     frame = TkFrame.new(super_widget, *args)
     return frame
   end
   def create_root(title='No window title')
     root = TkRoot.new('title'=>title)
     return root
   end
end

if __FILE__ == $0
   Ex_Combo.new.open
end
====================

If you open that application, and drop down with the mouse and select with  
the mouse, you see on $stdout your selection. If you open in any way, but  
select then by using TAB (focus goes to drop down list) and ENTER, your  
selection goes into the combo box, but is not reflected in the $stdout.

What do I have to get a binding for the different possibilities to use the  
combo box? Or is there even an easier way, eg. by using a binding to the  
variable that lays behind the combo box?

Thank you a lot for your help

Markus

-- 
Markus Liebelt; markus.liebelt@online.de