Well, further playing strongly suggests this is a bug to me (and I'll
log it as such).
The stuttering ...mouseEntered-mouseExited...mouseEntered-
mouseExited... events as you drag within a single tracking area happen
even in the simplest NSView:
http://idisk.mac.com/luke_e-Public/TrackingTesterDragDrop2.zip
(58KB)
The frequency at which the paired events arrive, for essentially a
constant velocity of mouse movement seems to vary. Sometimes, you get
very regular events tracking the mouse left-to-right, and only very
occasional events tracking right-to-left, sometimes its 'smooth' (but
still paired out-in) in both directions, or very sketchy in any
direction. This is pure conjecture, but it's almost as if you
intersect with some other event stream generated periodically
internally (like the thing that generates "draggingUpdated" events
every 50/60 ms or so, and where the generation of mouse events occur
with relation to this determines whether you'll get mouseExit-
mouseEntered emitted, and whether they have a constant period (perhaps
when you happen to get 'in between' the periodic drag events) or not.
It certainly looks like there are some kinds of timing boundaries that
are interacting.
There are no mouseDragged events sent while you drag over the tracking
area (though the window for them arriving is minimal as the tracking
stuff ends each pair with "mouseExited").
It looks like I'm going to have to code a parallel hit-testing
mechanism for when the user is dragging items in from another app.
Unless there's some magic here, the NSTrackingArea stuff that handles
this in all other situations is simply gaga in this case.
-- lwe
On 10-Mar-09, at 8:43 PM, Luke Evans wrote:
For the curious, the test app is available at:
http://idisk.mac.com/luke_e-Public/TrackingTesterDragDrop.zip
(61.2 KB)
On 10-Mar-09, at 7:41 PM, Luke Evans wrote:
I have a test app that recreates the problem in what I consider a
reasonably sterile environment..
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