multitouch
Bradley T. Hughes
bradley.hughes at nokia.com
Mon Mar 1 07:09:12 PST 2010
On 03/01/2010 03:14 PM, ext Daniel Stone wrote:
> And from the NSTouch (OS X) class documentation:
> Touches do not have a corresponding screen location. The first touch
> of a touch collection is latched to the view underlying the cursor
> using the same hit detection as mouse events. Additional touches on
> the same device are also latched to the same view as any other
> touching touches. A touch remains latched to its view until the
> touch has either ended or is cancelled.
Very quickly, since I forgot to mention it in my original reply:
Bear in mind that this documentation is for OS X, and current Apple hardware
only has multi-touch support via track-pads. There is no touch-screen
hardware running Mac OS X today. It's either iPhone, iPod touch, or the
upcoming iPad. iPhone and iPod touch use a different API than the above,
UITouch instead of NSTouch, which actually does give on-screen locations (iirc).
The multi-focii discussions really only apply to multi-touch capable touch
screens, not to laptop track-pads or external multi-touch capable tablets
like some (all?) of the Wacom Bamboo tablets.
--
Bradley T. Hughes (Nokia-D-Qt/Oslo), bradley.hughes at nokia.com
Sandakervn. 116, P.O. Box 4332 Nydalen, 0402 Oslo, Norway
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