Mouse tracking in CALayer

FROM : Tom Pusateri
DATE : Fri Jan 04 22:51:26 2008

I have a single NSView in which I've created many CATextLayers to form
a menu that can slide over. I would like to expand a menu item if you
hover the mouse on the right edge of the CATextLayer. NSTrackingArea
seems to be a good fit except that it is view centric and not layer
centric. I thought about creating an NSTrackingArea for each layer
once the layers are positioned but after adding the constraints, I
don't know how to determine the layers position. There isn't a
delegate method or anyway to know when the layer position has been
calculated so I know where to create the NSTrackingArea. Of course,
then I have to deal with moving the tracking areas each time the layer
moves. Should I just used mouseMoved even though its less efficient?
Then how do I know which layer the mouse position is over?

Thanks,
Tom