wl_tablet specification draft

Pekka Paalanen ppaalanen at gmail.com
Sat Jun 28 02:41:33 PDT 2014

On Fri, 27 Jun 2014 13:04:59 -0700
Bill Spitzak <spitzak at gmail.com> wrote:

> On 06/26/2014 09:38 PM, Ping Cheng wrote:
> > With my experience, mapping whole tablet to a window or a
> > specific display area is preferred. That is how mapping works on Windows
> > and Mac too.
> First this is *only* when the drawing program wants it to happen. There 
> is some kind of mode switch so the user can use the pen to do things 
> outside the drawing area. When the drawing program is not controlling it 
> the user wants to be able to use the pen instead of the mouse for all 
> mouse actions.
> I would also love to see addressed the ability to get "square" movement 
> out of the pad, and to automatically switch to "mouse mode" if the 
> outputs are a significantly different shape than the tablet. Though 
> Linux was by far the worst, all three systems (OS/X and Windows) fell 
> down badly here, mostly by making it impossible to mode-switch between 
> mouse and tablet mode, and on Windows it is impossible to change the 
> scale of mouse mode. None of them would change how the mapping is done 
> when outputs are added/removed. I believe "limit to one monitor" is not 
> necessary and is only being provided as a work-around for the non-square 
> mappings that should be avoided in a different way.
> Even though it sounds like it is disagreeing with me, there is no need 
> for "mouse emulations". Wayland clients should all be written to know 
> that they could get pen events just like mouse events and to handle them 
> the same if they don't want to do anything smarter with the pen.

First you said that...

> Vaguely thinking of this from a Wayland client's pov it seems like what 
> should happen is this:
> - The pen moves the seat's mouse cursor, always. If more than one cursor 
> is wanted the pen should be in a different seat. The user is not 
> manipulating more than one device at a time and does not want to see two 
> cursors.

...and then you said the exact opposite, plus you require the
broken case where the same hardware events map to multiple
completely different protocols (wl_pointer *and* tablet).

Moving seat's "mouse cursor" means the tablet/pen controls the
wl_pointer and sends wl_pointer events. I don't see any way around

- pq

ps. You dropped everyone from CC.

More information about the wayland-devel mailing list