Today I fixed a drag problem and noticed a few things.
I have a group box containing a static text box and a push button. The
text box and the button cover most of the group box.
A drag handler is installed on the group box, handling the
kEventControlDragEnter, kEventControlDragWithin,
kEventControlDragLeave, kEventControlDragReceive, kEventControlDraw
events.
This didn't work very well because a fast drag often didn't result in
a "drag within" event. As a result the group box often didn't get
hilited when it should (Mac OS X Leopard).
I thought I would let the text box and the button handle the "drag
within" event too, but no events were generated!
I have worked around the problem by ignoring the "drag within" events
altogether, updating the hiliting after receiving a
kEventControlDragEnter or kEventControlDragLeave event.
I wonder if there any gotchas here?
Next I examined the controls using GetControlFeatures.
Result (flags):
group box 1-6-17
text box 6-9-17
push button 4-6-9-17-24
None of them has the kControlSupportsDragAndDrop = 1<<12 set!
OT: why is flag 24 kControlInvertsUpDownValueMeaning set for a push
button? According to the documentation this is for sliders and scroll
bars.
Jan E.
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