On Dec 11, 2008, at 3:11 PM, Houdah - ML Pierre Bernard wrote:
Hi!
My application shows a list of files in a table view.
I have implemented drag and drop so that users may drag files from
the list. I could envision them dragging the files onto other
applications for viewing or dragging them on a removable media to
create archive copies.
The problem occurs when the user drags the file to another folder on
the same disk. By default, the Finder then wants to move the file. I
need to prevent just that as it will cause havoc. For one, I would
lose track of the file.
Is there a way for the originating application to control the
allowed drag operations?
Check out NSDraggingSource protocol's -
draggingSourceOperationMaskForLocal:. You should be able to return
something like (NSDragOperationCopy | NSDragOperationLink) if you want
to make sure the original file stays in the same place. If you don't
mind the file being moved so long as you know its no longer available,
you could instead implement -(void)draggedImage:(NSImage*)anImage
endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation to be
notified when a move/delete is completed.
hope this helps,
-natevw
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