Re: [GtkGLExt] Using gtkglextmm widgets and libglademm

[Johan Seland <johan seland gmail com>]

On Sat, 22 Jan 2005 21:46:20 +0100, Miguel Angel Polo
<miguel polo telefonica net> wrote:
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> Hi all
> 
> I want to know the correct way to load a widget (derived from
> Gtk::GL::DrawingArea) from my .glade file

I have now managed to do it in what I believe is the most elegant way.
In glade I just add a custom widget, and point it to a custom creation
function, which I then have to define:

extern "C" 
GtkWidget*
getGLArea( char *widget_name, gchar *string1, gchar *string2, gint
int1, gint int2 ) {
	TRACE;

	 	Glib::RefPtr<Gdk::GL::Config> glconfig = 
	 	Gdk::GL::Config::create(Gdk::GL::MODE_RGB    |
                                     Gdk::GL::MODE_DEPTH  |
                                     Gdk::GL::MODE_DOUBLE);
	         // SimpleGLScene is just a subclass of Gtk::GL::Drawingarea
		SimpleGLScene *const widget = new SimpleGLScene( glconfig );
		widget->set_size_request( int1, int2 );
		widget->show();
		return Gtk::manage(dynamic_cast<Gtk::Widget*>(widget))->gobj();	
}

Take note of the extern "C" clause. Since it is a C function any
namespace it exists in is just syntatic sugar and must not be set in
glade.

I also explicitely have to call show() and set_size_request, setting
these in Glade does not seem to have any effect.


After loading the glade xml file I can get a pointer to the widget by calling:
refXml->get_widget( "OpenGLArea", GLarea );

-- 
Regards Johan Seland
PhD Student
Center for Mathematics with Applications
University of Oslo