get input device in wayland

[weinan wang]

Thanks for reply,
We want to achieve an application for touch input map,
it will map touch input to a output device when we have multi-screen.


The input map need provide a input device and a output device,
in our design, we will traversal all screen to ask user "is this screen you
want to map", and user choice a touch device by tap on a touch device,
just like "touch config" feature in Windows11.




All in all, we want to achieve an application for touch input map, if have a batter
design, i will discuss it with the designer.








At 2023-11-22 06:31:07, "Peter Hutterer" <peter.hutterer at who-t.net> wrote:
>On Tue, Nov 21, 2023 at 04:20:10PM +0800, weinan wang wrote:
>> Hey Guys,
>> We have an application that needs to get the touch device
>> corresponding to the touch event, and on X11, we can get the device ID
>> that sends this event according to the XI_Touch events, and then find
>> the device we want according to this ID.  But on Wayland, it seems
>> that neither wl_seat nor wl_touch can get device-related information,
>> this application is a user permission, so we can't use libinput to get
>> more low-level events.
>> Please ask if there is any other way to get the device that sends the
>> event?
>
>This is not possible in wayland, physical devices are abstracted into
>wl_pointer/wl_keyboard/wl_touch and the underlying device is not exposed
>anywhere through wayland or even current wayland-protocols.
>
>The sole exception is the wl_tablet protocol which is per physical
>device but that's due to how tablets are being used.
>
>You don't usually have access to the libinput context inside the
>compositor either (because Wayland itself doesn't require libinput, it's
>an implementation detail).
>
>The question here is: what are you trying to achieve? maybe there's a
>different way to do it than having access to the specific physical
>device.
>
>Cheers,
>  Peter
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