Re: [GtkGLExt] how do I caption mouse motion events?

["Timothy M. Shead" <tshead k-3d com>]

Peter wrote:
> Howdy,
>
> I'm trying to get a very simple OpenGL application going in gtkmm.  I have 
> experience with glut, and at this point I'm just trying to figure out how to 
> do very simple things in gtk.  In fact, I started with the gtkglextmm gears 
> demo on the web site, and gradually made changes putting in my drawing 
> instead.  The next thing I need for porting our app from glut is to capture 
> mouse motion on the gl drawing area and react accordingly.  I've tried 
> overriding the on_motion_notify_event method for both the drawing area and 
> the GtkWindow, but I can't seem to get that event to come through.  I can get 
> other events, such as on_expose_event to come through obviously because I'm 
> getting my drawing up on the screen.  Am I going after the wrong event or do 
> I need to do more than just override on_motion_notify_event?

For efficiency, many widgets don't process mouse and other events by 
default, and you have to explicitly enable them on a case-by-case basis. 
 See the documentation for Gtk::Widget::add_events() - you probably 
want to add Gdk::BUTTON_MOTION_MASK or one of its more specialized 
variations.

Cheers,
Tim