Re: new API for MacBook Air for Multi-touch trackpad?
Re: new API for MacBook Air for Multi-touch trackpad?
- Subject: Re: new API for MacBook Air for Multi-touch trackpad?
- From: Alastair Houghton <email@hidden>
- Date: Fri, 18 Jan 2008 11:04:04 +0000
On 17 Jan 2008, at 20:44, Ricky Sharp wrote:
It will be very interesting to see just how other vendors approach
this technology too. For example, on my Mac Pro, I obviously do not
have a track pad. But I do have a Wacom tablet. Would I eventually
be able to use multi-touch via that?
It seems unlikely, because tablets are generally not touch-sensitive;
AFAIK the pressure sensing is done in the tool, not in the tablet, and
even proximity sensing relies on electronic components in the tool I
think. The only way you could do something like multi-touch on a
graphics tablet would be to wear special thimbles on your fingers
(maybe this would be acceptable, I don't know).
Same goes for a touch-screen.
In future, I'd certainly expect multi-touch support for touch
screens. But that isn't to say that any given piece of hardware
currently in existence could do it; multi-touch requires that it is
possible for the software to distinguish multiple points of contact,
which is very dependent on the data that is provided by the hardware.
As for filing an enhancement request, I'm not sure (personally) that I
really understand what I'd want in terms of API right now. I think
I'd expect most of the standard gestures (e.g. pinch-zooming) to turn
into standard events, with messages added to the NSResponder protocol
to match. But I wonder whether there should be support for
application-specific gestures, and if so how the API should look for
such a thing... it presumably depends on what the trackpad is actually
reporting to the system?
Kind regards,
Alastair.
--
http://alastairs-place.net
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