[Fwd: Re: Derived widget in libglademm]

[Philipp Klaus Krause <pkk spth de>]

Sorry, I supposed this list modifies the Reply-to header.

-------- Original-Nachricht --------
Betreff: Re: Derived widget in libglademm
Datum: Sat, 01 Sep 2007 23:43:56 +0200
Von: Philipp Klaus Krause <pkk spth de>
An: Murray Cumming <murrayc murrayc com>
Referenzen: <46D98D97 4010308 spth de>
<1188682517 5941 0 camel murrayc-desktop>

Murray Cumming schrieb:

> Can we see the implementation of the constructor. I wonder if it calls
> the base constructor with the da parameter.
> 


Display::Display(BaseObjectType *da, Glib::RefPtr<Gnome::Glade::Xml>&
refGlade)// : Gtk::DrawingArea(da) causes runtime error.
{
	std::cout << "Constructor called.";
	std::cout.flush();
	Glib::RefPtr<Gdk::GL::Config> glconfig;
	glconfig = Gdk::GL::Config::create(Gdk::GL::MODE_RGB |
Gdk::GL::MODE_DOUBLE);
	
	if(!glconfig)
	{
		Gtk::MessageDialog e("Couldn't find OpenGL visual.\nPlease ensure that
OpenGL drivers are installed correctly.", Gtk::MESSAGE_ERROR);
		e.run();
	}

	if(!set_gl_capability(glconfig) || !is_gl_capable())
	{
		Gtk::MessageDialog e("Couldn't set OpenGL capability.\nPlease ensure
that OpenGL drivers are installed correctly.", Gtk::MESSAGE_ERROR);
		e.run();
	}
}

When I try to call the base constructor I get the following runtime error:
(ttedit:12863): GtkGLExt-CRITICAL **: gtk_widget_set_gl_capability:
assertion `!GTK_WIDGET_REALIZED (widget)' failed
and on_realize() isn't called.

It seems the derived widget is not used at all: When I change
	Display *display = 0;
	refXml->get_widget_derived("display", display);
	
	Gtk::Window* main_win = 0;
	refXml->get_widget("main_window", main_win);
	
	if (main_win)
	{
		kit.run(*main_win);
	}
	return 0;
}

to

	Gtk::Window* main_win = 0;
	refXml->get_widget("main_window", main_win);
	
	if (main_win)
	{
		kit.run(*main_win);
	}
	return 0;
}

in main the result looks the same. So it seems the get_widget_derived()
just creates a widget, but I haven't found out yet how to make
glademm/gtkmm/libglademm/whatever use it.

Philipp