Re: motion events

[Nick Soffe <nick soffe bioch ox ac uk>]

Thank you both for the explanations. I now activate gdk_pointer_grab
with the "confine pointer to window" option and gdk_pointer_ungrab
in the relevant press and release handlers. This prevents the user
straying outside the drawing area during cursor movement.It now behaves
exactly as I would like.
Nick Soffe.


On Tue, 16 Apr 2002, Paul Davis wrote:

> >Le Mardi 16 Avril 2002 10:53, vous avez écrit :
> >This isn't a problem but I am
> >> curious to know why this occurs. Sorry if this is obvious I'm new to all
> >> this.
> >> Nick Soffe.
> >
> >AS I know, this result is normal for one simple reason, which is that when
> >you click the button, you set focus on the window, until you release it. So
> >even if you move outside the window area, the focus is always on the window
> >you clicked on.
> >The workaround I see is to grab mouse position on the window, if it is not
> >contained by the window size, you're not in.
>
> you haven't set focus - thats misleading terminology. When a button
> press event occurs on a widget, X itself starts a pointer grab for the
> widget so that the button release event will always be delivered to
> the same widget. this means that all motion events will be delivered
> to the same widget while the button remains depressed.
>
> this is quite different from focus, and uses an entirely different
> mechanism.
>
> --p
>