How to implement two-finger gestures in Cocoa to go back and forth?

Question

Several applications, such as Safari and Finder, come back and forth when you swipe two fingers on your Magic Mouse (or three fingers on your Magic Trackpad).

How can I implement this in my Cocoa application? What classes are available?

Answer 1

The simplest three fingers are the easiest because NSResponder is already doing your job:

- (void)swipeWithEvent:(NSEvent *)event;

( , swipes, ), - . http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/EventOverview/HandlingTouchEvents/HandlingTouchEvents.html#//apple_ref/doc/uid/10000060i-CH13-SW10

Answer 2

, NSView, , (, NSScrollView), - scrollWheel: (NSEvent *) . , [event deltaX] [deltaY].