[weston1.5]Question about HardKey input monitor with wayland/weston

[Pekka Paalanen]

On Mon, 5 Jan 2015 11:48:00 +0000
Yang Andy <williamyang13 at hotmail.com> wrote:

> Hi Pekka
> 
> Thank you very much for your reply.
> 
> > If you're interested in that, you can
> >dig the wayland-devel mailing list archives, or if you can't find it,
> >someone else probably can. This discussion was about any normal app
> >that just wants to register for a global hotkey.
> I have searched for the related topic,but i did not find it.

Here are some pointers:

http://lists.freedesktop.org/archives/wayland-devel/2014-July/015869.html
which is a part of a thread starting at
http://lists.freedesktop.org/archives/wayland-devel/2014-July/015856.html
containing some discussion.

There's some hand-waving and a youtube link in
http://lists.freedesktop.org/archives/wayland-devel/2012-September/005603.html

Some good ideas are in
http://lists.freedesktop.org/archives/wayland-devel/2013-December/012659.html

I didn't find what I would think as the latest comprehensive
proposal, though.

> >In all cases, the main idea is to prevent random clients from
> >eavesdropping input, while still letting the right client(s) get them.
> >This is always some new protocol extension that is unrelated to
> >wl_keyboard, wl_pointer, etc.

> Right now,my solution is to extend wl_keyboard protocol,because the
> work volume is little.

So you are faking temporary keyboard focus changes in the
compositor to send keyboard events? I believe that will be hard to
make it work right and follow the guarantees we require from
wl_keyboard events, if not impossible.

> Software architecture is HMI-->QT/EFL(wayland/client)-->westion(wl_keyboard/extention key)--evdev.
> 
> But i have another question.
> 
> In my uses case,i will composite QT-applicaiton and EFL-applicaion into one image,both of them want to get hardkey input event but only one application can get the input event who get the foucs.
> 
> When QT /EFL application want to get hardkey input event,it have to get the windows focus.
> 
> How do i switch the focus/active for specific QT or EFL application by software design?
> 
> Could you give some advice?

I think you have a fundamental problem here: global hotkeys cannot
be in any way associated with keyboard focus. That is their whole
point: they must work without any focus. So a design that relies
on focus or focus switching is broken from the start.

This is one of the reasons why we cannot use wl_keyboard for this.
We need a whole new protocol extension.


Thanks,
pq