From: Lyle Johnson <lyle@...>
Date: 2002-12-06T09:16:37+09:00
Subject: Re: FXRuby question

Rich Kilmer wrote:

> Does anyone know how to capture the event generated when one clicks on
> the X button in the upper right corner?  I want to perform some
> verifications and cleanup prior to closing.

When you click the kill button on the main window, it (the FXMainWindow 
object) first sends a SEL_CLOSE message to its message target, if any. 
If that target handles the message then life goes on (i.e. the 
application doesn't shut down). If the main window doesn't have a 
message target, or if it does but the target doesn't handle the 
SEL_CLOSE message, then the main window sends a SEL_COMMAND message 
(with identifier FXApp::ID_QUIT) to the application (FXApp) object. And 
that more or less terminates the main FOX event loop.

So for what you're describing, I think I'd try something like this:

     theMainWindow.connect(SEL_CLOSE) do
       # Do fun things
       verify_things
       clean_up_things

       if ok_to_quit?

         # All is well to shut down, so go ahead
         # and send the ID_QUIT message to the
         # application.

         theMainWindow.app.handle(theMainWindow,
           MKUINT(FXApp::ID_QUIT, SEL_COMMAND), nil)
       else

         # We've decided not to shut down after all

       end
     end

Hope this helps,

Lyle