NSOutlineView drag and drop: how to prevent parent being dropped on one of its children
NSOutlineView drag and drop: how to prevent parent being dropped on one of its children
- Subject: NSOutlineView drag and drop: how to prevent parent being dropped on one of its children
- From: Koen van der Drift <email@hidden>
- Date: Sat, 29 Oct 2011 16:18:42 -0400
Hi,
I'm setting up drag and drop for my NSOutlineView and I want to prevent parents being dropped on one of their children. The parent and children are all of the Group entity. I understand I need to do this in the outlineView:validatedrop method. I think I need to create an NSFetchRequest with the NSPredictate to get all the children of the parent, but I don't know what the predicate should be.
It should be recursively, so it should also get the children of children, if any.
Any suggestions?
Thanks,
- Koen._______________________________________________
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