Re: Handling "Smart Zoom" gesture?
Re: Handling "Smart Zoom" gesture?
- Subject: Re: Handling "Smart Zoom" gesture?
- From: Quincey Morris <email@hidden>
- Date: Thu, 28 Jun 2012 00:31:00 -0700
On Jun 28, 2012, at 00:14 , Graham Cox wrote:
> Specifically, the problem is that the -clickCount property of an NSEvent is only applicable to mouse events, not touch events. So what's the right way to trap this specific gesture? I have read the various touch-input documentation but nothing became obvious.
The 10.6 document seems to imply that tapping isn't a gesture, so I'd assume you'd have to implement the NSResponder methods 'touches…WithEvent:' and use the event times to decide (a) if precisely 2 touches begin/end more or less simultaneously and (b) if a second 2-touch tap begins within a time interval after the 1st one [iOS defaults to 0.5 sec for this interval. Perhaps on the Mac you'd use something conditioned by the double-click time instead. I dunno.] and (c) if both 2-touch taps last less than some time interval [otherwise they'd represent a long press].
Something like that?
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