Re: Key Release Events

["Jasper St. Pierre" <jstpierre mecheye net>]

This behavior is actually super tricky to get right and is implemented
with a complex state machine in mutter.

https://git.gnome.org/browse/mutter/tree/src/core/keybindings.c#n1722

You cannot implement something similar from a GNOME Shell Extension. Sorry.

On Thu, Apr 23, 2015 at 7:52 PM, Vjekoslav Brajkovic
<vjeko brajkovic org> wrote:
> Thanks Jasper!
>
> Let me try to narrow down my question. Gnome appears to be doing the thing I
> want, I just cannot figure out how it's doing it.
>
> 1) I press and hold the <Super> key.
> 2) The current active window does retains focus. If I type anything while
> I'm holding the key, that window will receive keyboard input.
> 3) Once I release the <Super> key, overview actor will become active.
>
> I would like to get the same functionality. I would like to get notified
> when that key gets released the same way overview does. In order to get this
> working do I have to change main.js?
>
>
> On 04/23/2015 07:32 PM, Jasper St. Pierre wrote:
> > X11 has no such mechanism to give that to you. Key presses and
> > releases are sent directly to the application that has focus, not to
> > the window manager.
> >
> > Main.wm.addKeybinding allows you to register a "grab", which is a way
> > of punching through this model, but unfortunately, grab semantics are
> > hard to make work for the release case. So we don't properly trigger
> > keybindings for key release.
> >
> > On Thu, Apr 23, 2015 at 4:40 PM, Vjekoslav Brajkovic
> > <vjeko brajkovic org> wrote:
> > > Hi!
> > >
> > > I am writing an extension and would like to get notified when a
> > > key-*release*-event has occurred regardless of which actor has key focus
> > > and
> > > without changing it.
> > >
> > >  From what I understand, the indented way of doing this would be by
> > > registering a callback with Main.wm.addKeybinding() and specifying a
> > > desired
> > > KeyHandlerFunc. The problem is that key release/press information seems
> > > to
> > > be missing when the handler gets invoked -- the  ClutterKeyEvent
> > > parameter
> > > is missing and instead of it I get Meta.KeyBinding.
> > >
> > > I have also tried doing global.stage.connect('key-release-event', ...),
> > > but
> > > the stage does not receive any signals unless I change the key focus to
> > > an
> > > actor like overview, which I assume propagates its signals.
> > >
> > > Does anyone have any ideas or suggestions?
> > >
> > > Thanks!
> > > Vjeko
> > >
> > >
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> > > gnome-shell-list mailing list
> > > gnome-shell-list gnome org
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-- 
  Jasper