Detect mouse coordinates on hover

Question

OK, so basically this is what I want :

• I have an NSView (embedded in an NSSplitView but that shouldn't matter
• When mouse reach its leftmost edge (or a few pixels more - perferable as a percentage of the overall window width: like when mouse is within the leftmost 15% of the screen), an event should be fired
• And then I'm going to expand the leftmost view of the split view

How should I go about this?

Answer 1

Check out the NSTrackingArea reference. You can add tracking areas to your view that will respond to mouseEntered: events.