How to get a kEventMouseExited at the edge of a window

kEventWindowCursorChange

 

Hey all,

 

First a word of warning, though I’ve been programming for Windows for quite some time, I’m very new to OS X.  So if my question is obvious, I apologize.

 

My goal is to get a notification when the mouse leaves my window content region (in 10.3+).  I saw kEventMouseExited and decided to try to use that.  I added a call to CreateMouseTrackingRegion, passing in the region returned by GetWindowRegion(kWindowContentRegion) and kMouseTrackingOptionsGlobalClip.  But even after realizing I needed to call SetMouseTrackingRegionEnabled(true), I still never get any events. 

 

As an experiment, I created a Rect slightly smaller than the size of my window (about 10 pixels on each side) and passed that in to CreateMouseTrackingRegion with kMouseTrackingOptionsLocalClip.  After doing that I started to get kEventMouseExited events.  However, I noticed that if I moved the mouse very quickly (fast enough that I don’t get mouse moved events inside that 10 pixel boundary), then I don’t get kEventMouseExited. 

 

As another failed experiment (based on something I saw in google) I tried catching kEventWindowCursorChange in my application event handler, but that too didn’t catch mouse moves that weren’t over my window.

 

So I need some way to get a notification when the mouse is leaving the content region of my window – what other options are there?

 

Thanks,

Matthew