Re: Gtk::DrawingArea with Cairomm from Glade - no Event

[Andreas Volz <lists brachttal net>]

Am Thu, 28 Jan 2010 10:45:14 -0800 schrieb Lyle Underwood:

Hello Lyle,

thanks for this hint. It works nice nice. From the docs I really don't
see the difference between add_events and set_events...

regards
	Andreas

> You don't need an event box. I inherited from Gtk::DrawingArea and put
> this in the constructor:
> 
> this->add_events(Gdk::POINTER_MOTION_MASK
> 		| Gdk::POINTER_MOTION_HINT_MASK
> 		| Gdk::BUTTON_PRESS_MASK
> 		| Gdk::LEAVE_NOTIFY_MASK);
> 
> Obviously I wanted to track the pointer motion as well ( for my
> rudimentary drawing app ). Also, make sure your DrawingArea is
> sensitive.
> 
> On Thu, 2010-01-28 at 19:24 +0100, Andreas Volz wrote:
> > Hello,
> > 
> > I placed a Gtk::DrawingArea in Glade and realized it with cairomm.
> > All drawing on this surface works, but I get only expose events.
> > Even if I overwrite the on_event() functions I see not any more
> > events. I'm interested in the mouse button/position events. My
> > first idea was to use 
> > 
> > set_events (Gdk::EXPOSURE_MASK | Gdk::BUTTON_PRESS_MASK |
> > Gdk::BUTTON_RELEASE_MASK);
> > 
> > but this results in:
> > 
> > (state:15062): Gtk-CRITICAL **: gtk_widget_set_events: assertion
> > `!GTK_WIDGET_REALIZED (widget)' failed
> > 
> > Do I have to place my Gtk::DrawingArea in a Gtk::EventBox o catch my
> > mouse events? Any other hints?
> > 
> > regards
> > 	Andreas
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> 
>