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Core Data Drag and Drop with Tree Controller

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Core Data Drag and Drop with Tree Controller

Subject: Core Data Drag and Drop with Tree Controller
From: "Ian G. Gillespie" <email@hidden>
Date: Wed, 1 Jun 2005 15:10:07 -0400

I have read a few several posts regarding drag and drop with core data (e.g. http://www.cocoabuilder.com/archive/message/cocoa/ 2005/5/10/135449) and D-n-D with bindings (http://lists.apple.com/ archives/cocoa-dev/2005/Jan/msg00734.html including mmalc's Bookmarks example). I am trying to implement reordering of objects, via drag and drop, in an outline view but seem to be stuck.

The problem I am having seems to be that I can't remove an object, keep a reference of it around, and then re-insert it into my NSTreeController. The object gets removed, but never re-appears in my outline view. This is how I have tried to implement thus far:

1) In the writeRows:toPasteboard... delegate method I put the rows into an array called _draggedRows. 2) In my acceptDrop... delegate method I remove the dragged object by referencing it from _draggedRows and by calling removeObjectAtArrangedObjectIndexPath on my tree controller (I figure out the index path by using NSOutlineView's rowForItem:, etc). 3) I re-insert the object using the reference kept in the _draggedRows using insertObject:atArrangedObjectIndexPath. When I re- insert the object I have to use the private observedObject method to re-insert a non-_NSArrayControllerTreeNode. But the object never appears in the outline view at the insert location.

Does anyone have any suggestions as to why my re-inserted object doesn't appear in the outline view? _______________________________________________ Do not post admin requests to the list. They will be ignored. Cocoa-dev mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden Prev by Date: Re: NSFileHandle and FIFO files Next by Date: Re: Coredata schema question. Previous by thread: Re: NSFileHandle and FIFO files Next by thread: Handling observing CoreData undo's Index(es): Date Thread