From: Masao Mutoh <mutoh@...>
Date: 2003-12-16T23:49:07+09:00
Subject: Re: ruby-gtk2 extension

Hi,

On Tue, 16 Dec 2003 16:14:09 +0900
Gregory Millam <walker@lethalcode.net> wrote:

> I'm writing a script based off a ruby-gtk2 extension, and I'd like to know if there exists a standard (or ruby-gtk2 built in) method of exiting the program only after the last window closes. There isn't one main window that controls the rest, but several windows open in parallel.
> 
> If this was solely for my own application, I could keep a running track of open windows with an array, making each window delete itself from the array and calling Gtk.main_quit if there are no more objects in it. But this obviously isn't too portable across scripts; it is too unlikely that another coder who's going to use my script will use the same method.
> 
> So ... is there any consistent method of forcing main_quit to be called only if there are no more guis displaying, timer events, etc?

Hmm, I think your solution is not so bad.
The sample below is an example to use Gtk::Window.toplevels, 
though I don't know this is better than yours.
 
require 'gtk2'
                                                                                
class SampleWindow < Gtk::Window
  def initialize
    super()
    button = Gtk::Button.new("open a new window")
    button.signal_connect("clicked") do
      SampleWindow.new.show_all
    end
    add(button)
    signal_connect("destroy") do
      availables = Gtk::Window.toplevels.select{|win| ! win.destroyed?}
      Gtk.main_quit if availables.size < 2
    end
  end
end
                                                                                
Gtk.init
SampleWindow.new.show_all
Gtk.main


-- 
.:% Masao Mutoh<mutoh@highway.ne.jp>