Re: Question about delete_event_impl

[Murray Cumming <murrayc murrayc com>]

On Tue, 2006-01-24 at 17:16 +0100, J. Baltasar Garcia Perez-Schofield
wrote:
> 	Hi, there !
> 
> 	I'm using Gtkmm 2.4 for a new project, with the interface classes
> generated by Glade.

I think you mean glademm. It has its own mailing list. libglademm (not
glademm) is recommended.


>  My problem is that I want to intercept the closing
> event of a window, and I've read that you can simply override the
> following method in your window:
> 
> 	gint delete_event_impl(GdkEventAny *);

Maybe you are reading gtkmm 1.2 documentation. In the gtkmm 2.0 and
gtkmm 2.4 (2.8 is the latest version of gtkmm 2.4) APIs, you can
override

bool on_delete_event(GdkEventAny* event);

There is no need to connect to a signal if you are just overriding this
default signal handler. However, you might need to call the base class
on_delete_event() from your override.

> 	So I have my class VentanaPpal inheriting from VentanaPpal_Glade which
> inherits from Gtk::Window as well, and then I introduce the line above
> in the .h file and implement the method in the .cpp file: 
> 
> gint VentanaPpal::delete_event_impl(GdkEventAny *)
> {
> 	if ( askYesNo( "Are you sure?" ) )
> 	{
> 		if ( getCurrentDocument() != NULL ) {
> 			saveCurrentDocument();
> 		}
> 		
> 		Gtk::Main::quit();
> 		return false;
> 	}
> 
> 	return true;
> }
> 
> 	Not very complex/specialized code. Also, the "exit" menu option signal
> handle calls delete_event_impl() function.
> 
> 	Once the application is running, selecting the "exit" menu option makes
> the application to exit correctly, asking the user whether he or she is
> sure or not. However, if I close the window, it just finishes its
> execution.
> 
> 	The documentation says that when a window is about to be closed, the
> signal handle for delete is called, as well as the delete_event_impl()
> method.
> 
> 	Where's my error ?
> 
> 	I also tried to connect a signal manually, in the constructor of
> VentanaPpal_Glade:
> 
> 	signal_delete_event().connect(SigC::slot(*this,
> &VentanaPpal_glade::on_close), false);
> 
> 	However, it then complains about functors.h not ignoring a void value
> (I suppose it has to do with the template receiving the method pointer).
> 
> 	Regards,
> 
> 		Baltasar
> 
> 
> 
> --
> 
> PBC -- J. Baltasar Garc�Perez-Schofield
> jbgarcia en uvigo de es  http://webs.uvigo.es/jbgarcia/
> Dep. Inform�ca, Universidad de Vigo, Espa�Spain)
> 
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-- 
Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com