Re: How to capture key-press-event on gtk:event-box?

Kevin L <[email protected]> writes:

> I've got an app that creates multiple windows, each window having an 
> event-box containing a drawing-area.  I am having trouble capturing key 
> press/release events from the event-box.  Here is the relevant code that 
> sets up a window:
>
> [code deleted]
> 
> Everything works except that when I have a window focused and hit a key, 
> nothing happens.
> 
> I have tried tying the keyboard events to the drawing-area, but same 
> problem.

That is because the toplevel windows which has the focus is receiving
the keyboard events. If you don't have other widgets inside the toplevel
which needs to receive keyboard events, you could probably just connect
your keyboard handler to the toplevel.
 
> I captured enter-notify-event and leave-notify-event specifically so I 
> had a place in code to set keyboard focus on the event-box, but I'm not 
> finding any functions to do that.  I can't set focus on the window or on 
>   the event-box.
> 
> I feel like maybe two lines of code in #'system-enter will fix this, but 
> I've no idea what they are.

The two lines of code you need are something like this:

  (setf (gtk:widget-can-focus-p event-box) t)
  (gtk:widget-grab-focus event-box)

You should only need to call widget-grab-focus when you are giving focus
from one widget inside the toplevel to another, and not in every
enter-notify events.

-- 
Espen

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