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copied!<p><strong>Edit:</strong> Snow Leopard adds supported APIs for gestures and multi-touch. See the <a href="http://developer.apple.com/library/mac/releasenotes/Cocoa/AppKitOlderNotes.html#X10_6Notes" rel="nofollow noreferrer">AppKit release notes for Snow Leopard</a>; ⌘F for “gesture” and “MultiTouch” (sic). They'll look pretty familiar if you've used ones below, but there probably are some fine differences, so read the new documentation anyway.</p> <hr> <blockquote> <p>Is this supported using publicly available APIs on Mac OS X 10.5 Leopard?</p> </blockquote> <p>No. 10.5.0 doesn't support it at all, and 10.5.1 through 10.5.6 make you implement undocumented methods.</p> <blockquote> <p>If not, how "bad" are the private APIs (e.g. is it just an undeclared constant or a whole new set of methods)?</p> </blockquote> <p>Not bad at all. <a href="http://web.archive.org/web/20090618162428/http://cocoadex.com/2008/02/nsevent-modifications-swipe-ro.html" rel="nofollow noreferrer">You have to implement some undocumented event methods in your view.</a> Since <em>you're</em> the one implementing the methods, you shouldn't crash if Apple changes the methods; all that will happen is the feature will stop working.</p> <p>However, if you'll be retrieving the absolute (not delta) magnification or rotation from the event, then those are as-yet-undocumented methods of the event, so you should guard those messages with <code>respondsToSelector:</code> messages and perform careful range-checking on the methods' return values.</p>

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