Comments on: Mouse tracking by Lap Cat http://lapcatsoftware.com/blog/2006/10/26/mouse-tracking-by-lap-cat/ Coding under the close supervision of cats Sat, 22 Nov 2008 10:40:12 +0000 http://wordpress.org/?v=2.6.3 By: Jeff http://lapcatsoftware.com/blog/2006/10/26/mouse-tracking-by-lap-cat/#comment-34 Jeff Sat, 28 Oct 2006 15:47:05 +0000 http://lapcatsoftware.com/blog/2006/10/26/mouse-tracking-by-lap-cat/#comment-34 <p>Now the Apple documentation can just link to my blog post!</p> <p>Strangely, when I used SummaryService to get the post down to one sentence, the sentence was <q>It’s almost as if your mouse were approaching the speed of light, and events that appear in sequence from the mouse’s perspective appear simultaneous from the perspective of the stationary window, because of the principles of special relativity.</q> I guess programming is rocket science. Can't … crack … a smile … wouldn't be logical, captain.</p> Now the Apple documentation can just link to my blog post!

Strangely, when I used SummaryService to get the post down to one sentence, the sentence was It’s almost as if your mouse were approaching the speed of light, and events that appear in sequence from the mouse’s perspective appear simultaneous from the perspective of the stationary window, because of the principles of special relativity. I guess programming is rocket science. Can’t … crack … a smile … wouldn’t be logical, captain.

]]> By: Simon Wigzell http://lapcatsoftware.com/blog/2006/10/26/mouse-tracking-by-lap-cat/#comment-33 Simon Wigzell Sat, 28 Oct 2006 15:29:17 +0000 http://lapcatsoftware.com/blog/2006/10/26/mouse-tracking-by-lap-cat/#comment-33 I reported this Dec 2005 as radar bug 4375548 at Apple, with a request to at least document this behaviour; case is still open :-) I reported this Dec 2005 as radar bug 4375548 at Apple, with a request to at least document this behaviour; case is still open :-)

]]> By: Abridged Version for the Impatient http://lapcatsoftware.com/blog/2006/10/26/mouse-tracking-by-lap-cat/#comment-32 Abridged Version for the Impatient Sat, 28 Oct 2006 05:20:50 +0000 http://lapcatsoftware.com/blog/2006/10/26/mouse-tracking-by-lap-cat/#comment-32 There was a bug in Vienna where mouse-clicking in another browser tab didn’t always bring the other tab forward. The bug seemed to occur at random (worst kind of bug). I’ve uploaded a simple demo application project, TrackingRects, that simulates mouse tracking for Vienna browser tabs with close buttons. The application presents a window containing two larger boxes (simulating tabs), each of which contains a smaller box (simulating a close button). Every box has a mouse-tracking rectangle within its borders, and all of the resulting mouseEntered: and mouseExited: messages are logged. If you move the mouse in and out of the boxes slowly, then everything works as expected. Weirdness begins to happen, though, if you zip the mouse through the boxes. According to the logs, the mouse has entered the second box before it exited the first box. Apparently, Cocoa likes to send mouseEntered: messages before mouseExited: messages when they’re close enough together (!). Bottom Line: Do not rely on the runtime to send event messages to your code in a particular order. There was a bug in Vienna where mouse-clicking in another browser tab didn’t always bring the other tab forward. The bug seemed to occur at random (worst kind of bug).

I’ve uploaded a simple demo application project, TrackingRects, that simulates mouse tracking for Vienna browser tabs with close buttons. The application presents a window containing two larger boxes (simulating tabs), each of which contains a smaller box (simulating a close button). Every box has a mouse-tracking rectangle within its borders, and all of the resulting mouseEntered: and mouseExited: messages are logged.

If you move the mouse in and out of the boxes slowly, then everything works as expected. Weirdness begins to happen, though, if you zip the mouse through the boxes. According to the logs, the mouse has entered the second box before it exited the first box. Apparently, Cocoa likes to send mouseEntered: messages before mouseExited: messages when they’re close enough together (!).

Bottom Line: Do not rely on the runtime to send event messages to your code in a particular order.

]]> By: Scott Stevenson http://lapcatsoftware.com/blog/2006/10/26/mouse-tracking-by-lap-cat/#comment-31 Scott Stevenson Fri, 27 Oct 2006 01:45:59 +0000 http://lapcatsoftware.com/blog/2006/10/26/mouse-tracking-by-lap-cat/#comment-31 I Iike Vienna more after reading posts like this. I Iike Vienna more after reading posts like this.

]]>