On Thu, Nov 29, 2012 at 12:45 AM, Olivier Fourdan <ofour...@redhat.com>wrote:
>
> Hi Peter,
>
> Peter Hutterer said the following on 11/29/2012 06:34 AM:
> > As Ping said, up/down on a ring is ambiguous. we use that
> > terminology in the driver, but I do think we have the chance here to
> > use CW/CCW instead.
>
> Right, but is is it guaranteed that {Abs,Rel}Wheel*UP as received by
> the client is always CCW on the hardware and {Abs,Rel}Wheel*Down is
> always CW, for all devices out there?
>
> Otherwise there would be no way to accurately match what's received
> from the driver with the CW/CWW naming convention.
>
> Cheers,
> Olivier.
>
I would consider this to be behavior you can rely on. On a dial-type
control, "forward", "bigger", etc. are universally achieved through CW
rotation. Even if the hardware were wired backwards for some reason, we'd
still almost certainly correct it in software to ensure an appropriate user
experience. It would be exceedingly strange for a device to *intend* for
rotation to work backwards.
Jason
---
When you're rife with devastation / There's a simple explanation:
You're a toymaker's creation / Trapped inside a crystal ball.
And whichever way he tilts it / Know that we must be resilient
We won't let them break our spirits / As we sing our silly song.
>
>
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