objective c - Cocoa: distinguish input device / scrollWheel: as mouse-scroll wheel and TrackPad -

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i looking method reliably distinguish within [nsresponder scrollwheel:] if users input device has one-dimensional scroll-wheel or 2 dimensional trackpad/magicmouse?

in first implement different behavior. taking on deltax of nsevent little weak. suggestions?

you can use private method call [theevent _scrollphase] tell whether device using inertial scrolling, indicates apple-supplied input device. (note: won't work if user has disabled inertial scrolling)


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