Re: focus, and intercepting arrow keys

[Jeff 'japhy' Pinyan <japhy perlmonk org>]

On Mar 22, muppet said:

> > I have Notebook and Button widgets, but I'd really like to intercept the 
> > pressing of arrow keys and have them affect an entirely different widget. 
> > Where should I set up the signal handler, and how can I prevent the arrow 
> > keys from "falling through" my key_press handler to the other widgets?
>
> - declare public functions on my image display widget to do zooming scrolling.
> - connect to the key-press-event of the toplevel window in which the widget is 
> packed
>  - in that handler, call the appropriate functions on the widget in response 
> to the arrow keys and +/- keys.
>  - if i handled the event, return TRUE to stop event propagation.  otherwise, 
> return FALSE to let the default handling occur.
>
> arguably, a more correct way to do it would've been to make the widget itself 
> focusable, and then set up the key handling only in that widget, but i had 
> trouble with that (and it was long ago so i don't remember why).

Ah HA.  Thank you.  I wasn't setting the handler for the toplevel, I was 
doing it for the container holding the widget.  I was doing everything 
else right.

--
Jeff "japhy" Pinyan         %  How can we ever be the sold short or
RPI Acacia Brother #734     %  the cheated, we who for every service
http://japhy.perlmonk.org/  %  have long ago been overpaid?
http://www.perlmonks.org/   %    -- Meister Eckhart