Re: can_activate_acce

[muppet <scott asofyet org>]

On Jul 25, 2005, at 5:26 PM, justin+gnome dicatek com wrote:

> I was under the impression that one should return FALSE to inhibit the
> accelerator. (Although, there are several contradictory versions of  
> the
> documentation.)

Well, i, too, was wrong.

The docs for the signal indeed say "returns: TRUE if the signal can  
be activated."
But, in the code, the signal is created with the  
_gtk_boolean_handled_accumulator, the same accumulator used for event  
signals, which stops the signal emission when any handler returns TRUE.

The signal is a run-last signal, so the default handler, which  
returns TRUE if the widget is visible, will override any return value  
you give in a normal handler.  Since it's run-last and returns TRUE  
from a boolean-handled accumulator, connect_after is useless.  Thus,  
to return FALSE, you have to stop the signal emission in your  
handler, like so:

  $button->signal_connect (can_activate_accel => sub {
        # stop the emission of this signal, so our return value is  
used.
        $button->signal_stop_emission_by_name ('can_activate_accel');
        # allow the accelerator to fire iff the keyboard focus is not
        # in the entry.
        return $window->get_focus != $entry;
  });



--
The door is locked.  I tried to open it, but the lock is harder to  
pick than a broken nose.
  -- Sensei, on 'I, Ninja'