Drag and drop not working from NSMatrix subclass

• Subject: Drag and drop not working from NSMatrix subclass
• From: "Lawrence Sanbourne" <email@hidden>
• Date: Sun, 30 Apr 2006 20:12:23 -0500
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Hello,

I have a source-list NSTableView, and an NSMatrix subclass plus
another NSTableView representing the same data as the matrix (icon vs.
list view). Dragging from the list view to the source list is work
great. For the NSMatrix, I implemented my own drag-and-drop support,
and although the drag image is appearing correctly, the source list
won't accept the drops. It doesn't even call
-tableView:validateDrop:proposedRow:proposedDropOperation:.

My matrix calls this method from -mouseDragged::

[self dragImage:dragImage
						 at:imageLoc
					 offset:NSZeroSize // ignored in 10.4
					  event:theEvent
				 pasteboard:[NSPasteboard pasteboardWithName:NSDragPboard]
					 source:self
				  slideBack:YES];

And it returns the proper drag mask in -draggingSourceOperationMaskForLocal:.

Any ideas what I'm doing wrong?

Larry
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