From: Paul Rubel <prubel@...>
Date: 2005-04-07T04:18:42+09:00
Subject: constrained gtk radio buttons

Hello,

I've been trying out gtk and gtk2 for the first time over the past few
days. Overall it has been a good experience. At the moment however,
I'm stumped and was hoping someone might be able to enlighten me.

At a hight level I have two sets of radio buttons and want to change
the selection of one set of buttons when a button in the other set is
clicked. 

More specifically, the buttons represent a mouse. One side is button
(Left, Right, Center,...)  and the other is type of click (single,
double, and drag). When L is selected any of the click
types should be available. However, if R is selected
and a user clicks on double I'd like to change from R to L as a
double right doesn't seem very useful.

On a click on double I'm able to call @left_button.set_state(true) and
this changes from R to L as I'd expect. However, when I do this double
doesn't get selected, single is still selected. The code below is my
attempt to get this working.  If you start it and click on right and
then double you'll see what I described above. 

One interesting thing I do notice is that the first click on double
prints out "clicked double" twice, which is odd. I suspect there is
something in the event dispatching that I'm missing. Is there a better
way to set the state of the button? Any help would be appreciated.

          thank you,
           Paul



require 'gtk'

class DwellWindow < Gtk::Window

  def initialize()
    super
    @single_button = Gtk::RadioButton.new(nil, "Single")
    @double_button = Gtk::RadioButton.new(@single_button,"Double")
    @double_button.signal_connect("clicked") {@left_button.set_state(true);puts " clicked double"}

    @left_button = Gtk::RadioButton.new(nil, "Left")
    @right_button = Gtk::RadioButton.new(@left_button, "Right")
    @right_button.signal_connect("clicked") {@single_button.set_state(true)}


    type_box = Gtk::VBox.new
    type_box.add(@single_button)
    type_box.add(@double_button)

    button_box = Gtk::VBox.new
    button_box.add(@left_button)
    button_box.add(@right_button)

    top_box = Gtk::HBox.new
    top_box.add(button_box)
    top_box.add(type_box)

    add(top_box)
    show_all
  end

end


dwell = DwellWindow.new
Gtk::main