Question

NSWindows have a variety of function to handle mouse events (i.e. void mouseDown for a left click, void mouseDragged for drags etc.). What function is used to handle double clicks?

Answer 1

NSWindow is a subclass of NSResponder and inherits its methods.
Each event handling method, -(void)mouseDown:(NSEvent *)theEvent; is one of them, takes an parameter; the event object.

To find out how many clicks have been recorded, query the event object.

From NSEvent documentation, here is the method that returns such information :

-(NSInteger)clickCount;

Returns the number of mouse clicks associated with the receiver, which represents a mouse-down or mouse-up event.