Re: NSOutlineView, NSTreeController and itemForPersistentObject...
Re: NSOutlineView, NSTreeController and itemForPersistentObject...
- Subject: Re: NSOutlineView, NSTreeController and itemForPersistentObject...
- From: William Turner <email@hidden>
- Date: Tue, 1 Jan 2008 15:14:43 -0800
There's a new sample code showing one approach to using some of the
Leopard APIs for NSTreeController/Core Data, including drag and drop.
It might be useful to take a look - http://developer.apple.com/samplecode/AbstractTree/index.html
Wil
On Jan 1, 2008, at 3:01 PM, Sebastian Morsch wrote:
Solved my own problem:
http://developer.apple.com/releasenotes/Cocoa/AppKit.html#NSTreeController
(should have check the obvious places before posting :-)
Am 01.01.2008 um 23:42 schrieb Sebastian Morsch:
Hi,
I'm picking up this over two years old thread here to see if there
was anything new on this matter...
It's about the old problem how to translate back and forth between
NSTreeControllers private tree node proxies and our Core Data
NSManagedObjects. In Tiger, these tree node proxies belong to the
undocumented _NSArrayControllerTreeNode class. Now in Leopard,
apparently they are instances of the also undocumented
NSTreeControllerTreeNode class (the fact that the underscore is
gone gives me some hope though :-). Fortunately, you can throw
representedObject at those NSTreeControllerTreeNodes to get your
managed object back, but the other way round, getting a tree node
proxy with a managed object, seems impossible (at least for my very
limited knowledge and for everything I googled).
I came across this, while trying to implement the autosaving of
expanded/collapsed state of an NSOutlineView (bound to
NSTreeController bound to NSManagedObjectContext) in Leopard.
Implementing outlineView:persistentObjectForItem: was easy, but I
completely failed on outlineView:itemForPersistentObject:.
I know there are other solutions to this ( http://lists.apple.com/archives/cocoa-dev/2007/Dec/msg00982.html
), but I got curious if something less expensive is possible in
Leopard. And I think, Drag'n'Drop implementation presents you with
the same old problem, doesn't it?
Sebastian
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