Drag to Nowhere and Disappearing Smoke
Drag to Nowhere and Disappearing Smoke
- Subject: Drag to Nowhere and Disappearing Smoke
- From: Philip Dow <email@hidden>
- Date: Tue, 6 Sep 2005 11:50:16 +0200
NSShowAnimationEffect() displays a system animation at a given point
in screen coordinates. The effect is used to indicate that an item
has been removed from a list without actually deleting the underlying
data. An example is dragging an item out of the far left list in a
finder window. As you drag, the cursor changes to show the
disappearing smoke, and when you let go the system runs the smoke
animation. That let's you know you're removing the item from the list
without deleting the item itself.
I would like to implement this effect to remove an item from a table
without deleting it. I can call the cocoa function no problems. What
I'm running up against is catching the drag to nowhere. On the one
hand, I'd like to know a drag is going on so that I can change the
cursor, on the other I need to know when the drag is finished and, by
the criterion of a normal drag, rejected, so that I can show the
effect and operate on my data. I figure if the finder can do this, I
can get pretty close.
I could catch mouseUp: in my window controller, but then how would I
know a drag is involved? Or I could implement drag in my window and
handle drops out of my tables in this special way. In either case, I
cannot accomplish what the finder can. When dragging out of that far
left list, you can drag to anywhere, window or not, to remove the item.
Has anyone had any experience trying something like this, or does
anyone know of any online articles or examples?
-Phil
http://phildow.net
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