Re: problem with motion_event on image

["Jonathon Jongsma" <jonathon jongsma gmail com>]

On 10/20/06, oedipus <alexander arnoldt gmx de> wrote:
> I had forgotten the Gdk::POINTER_MOTION_MASK. I included it, but still it
> will not do?
> Here is some of my code, to see the initialisation:
>
> image1->signal_expose_event().connect(SigC::slot(*this,&main_window_glade::on_image1_expose_event),
> false);
>
> image1->signal_motion_notify_event().connect(SigC::slot(*this,&main_window_glade::on_image1_motion_notify_event),
> false);
>
> main_window->signal_delete_event().connect(SigC::slot(*this,&main_window_glade::quit),
> false);
>
> image1 -> add_events(Gdk::POINTER_MOTION_MASK);
>
> and the signal:
> bool main_window::on_image1_motion_notify_event(GdkEventMotion *ev)
> {
>         label1 -> set_text("event is there");
>         return 0;
> }   // i have that reduced to a minumum first
>
> Thanks for the help

Assuming that image1 is a Gtk::Image object, this is one of the set of
widgets that doesn't have its own Gdk::Window so they don't receive
events (in order to improve performance).    If you want to catch an
event on this object, you'll probably need to stuff it into a widget
that does receive events, like a Gtk::EventBox and catch the events on
that widget.  See this page for more information:
http://gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/ch13.html
--
jonner