Drag & Drop in an NSOutlineView
Drag & Drop in an NSOutlineView
- Subject: Drag & Drop in an NSOutlineView
- From: "Carter R. Harrison" <email@hidden>
- Date: Mon, 14 Mar 2011 15:20:51 -0400
I'm having trouble getting drag and drop to work with an NSOutlineView. What I've done is below. The problem is that "tableView:writeRowsWithIndexes:toPasteboard" never gets called. I found a few people with the same issue and it seems that the cause of the problem is that I am using a custom cell that is a subclass of NSTextFieldCell, however I haven't been able to find a solution that fixes my problem.
1. Set the NSOutlineView's delegate and datasource outlets.
2. In the datasource's awakeFromNib method I call "registerForDraggedTypes:" on the outline view.
3. I implemented the following methods in my datasource:
- (BOOL)tableView:(NSTableView *)aTableView writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteBoard *)pboard
- (BOOL)outlineView:(NSOutlineView *)outlineView acceptDrop:(id < NSDraggingInfo >)info item:(id)item
- (NSDragOperation)outlineView:(NSOutlineView *)outlineView validateDrop:(id < NSDraggingInfo >)info proposedItem:(id)item proposedChildIndex:(NSInteger)index
Any help is greatly appreciated!
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