Re: focus, and intercepting arrow keys

[muppet <scott asofyet org>]

On Mar 22, 2005, at 4:40 PM, Jeff 'japhy' Pinyan wrote:

> 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?

not exactly sure what the "correct" way to do it is (probably something 
involving accelerator groups or keybindings), but here's what i've 
done:

- 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).

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