How to hide mouse cursor with weston and ivi-shell?

[Pekka Paalanen]

On Wed, 9 Dec 2015 18:50:38 +0530
Vikas Patil <vikasmpatil at gmail.com> wrote:

> On Wed, Dec 9, 2015 at 6:29 PM, Pekka Paalanen <ppaalanen at gmail.com> wrote:
> > On Wed, 9 Dec 2015 18:18:04 +0530
> > Vikas Patil <vikasmpatil at gmail.com> wrote:
> >  
> >> Dear All,
> >>
> >> I would like to have the mouse pointer support available with weston
> >> and ivi-shell (with ivi-controller.so) but want to hide the cursor
> >> which is always visible.
> >>
> >> Is there any easy way I can do this? Any ideas/suggestions?  
> >
> > Hi,
> >
> > what is your use case? There are several answers depending on what you
> > are doing and what kind of applications you are running.  
> 
> Thanks for your quick reply.
> 
> I need mouse pointer support as rotary knob hard key on our platform
> on GPIO added as standard mouse wheel support. I also required mouse

Hi,

I'll defer to Peter whether that device should be a pointer device or
something completely different. I would guess something different...

How do you decide which client or surface should receive the rotary
knob events?

> pointer support for the platform configuration which doesn't has touch
> support so mouse can be used for development. If I know how to just
> hide the cursor, probably I will try to do it via weston.ini config so
> when required visibility of cursor can be enabled/disabled.

Weston automatically creates and destroys the pointer capability and
the cursor with it whether there is a pointer device connected or not.

Forcing the cursor to not show would require hacking Weston core. I
can't help but think that this would be a poor bandaid for the
underlying problem.

> I  have application Qt/Qtwayland based HMI on top of weston and ivi-shell.
> 
> > All cursors are always set by clients, either applications or in
> > hmi-controller's case weston-ivi-shell-user-interface.  
> 
> I am not making use of hmi-controller and hence
> weston-ivi-shell-user-interface. I am using ilm apis directly with
> ivi-controller.so.

That does not change the fact, that the client whose surface the
pointer is on, is responsible for setting (or hiding) the cursor, when
a pointer device exists. wl_pointer.set_cursor is part of Wayland core
protocol and is implemented in Weston core. There are no configuration
options or API to keep the cursor hidden unless you remove the whole
pointer device...

Hm, I suppose you could try restacking the cursor_layer behind
everything else. That would be possible to do in ivi-shell, but I still
don't think it would be upstreamable.

> >> ** I can hide if I disable the MOUSE capability via udev custom rule
> >> but I don't want to remove the pointer support as it is required. Just
> >> want to hide the pointer drawing.  
> >
> > How does pointer support without a cursor make any sense?
> > You would be poking blind with the mouse, so there is no ready-made
> > option to do that.  

It turns out your pointer device is not a pointer device and that
causes problems. I'm not surprised.


Thanks,
pq
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