From: "Michael C. Libby" <m_libby@...>
Date: 2002-12-11T10:06:56+09:00
Subject: FXRuby, MDI window switching

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I have an FXMDIClient widget for which I would like to detect changes in 
active window so that I can modify root-level keybindings and change the 
menus available. I am having trouble capturing the SEL_CHANGED message in 
the FXMDIClient or the SEL_ACTIVATED messages in the child widgets.

Here is my sample code, which crashes pretty hard when I try to switch 
windows:

#!/usr/bin/ruby -w
require 'fox'
include Fox

def new_buffer(root,x)
  mdi_child = FXMDIChild.new(root, "Test", nil, nil, 0, (25 * x), (25 * x), 
400, 300)
  FXText.new(mdi_child, nil, 0)
  mdi_child.create
end

def switch_buffer(sender, sel, data)
  puts "sender: #{sender}\nsel: #{sel}\ndata: #{data}"
end

#create app
app = FXApp.new
mw = FXMainWindow.new(app, "mdi_test", nil, nil, DECOR_ALL, 0, 0, 640, 480)

buffers = FXMDIClient.new(mw, LAYOUT_FILL_X|LAYOUT_FILL_Y)

app.create
mw.show

3.times{|x|  new_buffer(buffers, x) }
buffers.connect(SEL_CHANGED, method(:switch_buffer))

app.run

The output:

m_libby@greyhound:~$ ruby mdi_error.rb
sender: #<Fox::FXMDIClient:0x40ec61b4>
sel: 2555904
data: #<Fox::FXMDIChild:0x40ec53e0>
mdi_error.rb:27:in `position': undefined method `position' for nil 
(NoMethodError)
	from mdi_error.rb:27:in `run'
	from mdi_error.rb:27
m_libby@greyhound:~$

I've tried tinkering with the block version of connect, and putting in 
return values from the switch_buffer method, but I still get errors either 
way. Any ideas?

ruby 1.7.3
FOX 1.0.28
FXRuby 1.0.16

Thanks.

  -michael

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