Re: Drag and drop in NSOutlineView connected to a NSTreeController
Re: Drag and drop in NSOutlineView connected to a NSTreeController
- Subject: Re: Drag and drop in NSOutlineView connected to a NSTreeController
- From: Keith Wilson <email@hidden>
- Date: Wed, 15 Mar 2006 01:57:46 +1100
Please file a request at http://bugreport.apple.com asking Apple to
make the private method observedObject of _NSArrayControllerTreeNode
made public. I want to use it too.
Keith
On 15/03/2006, at 12:46 AM, I. Savant wrote:
I feel ya, I really do. However, some good points from the article:
"In Tiger, using NSTreeController with NSOutlineView means drag-and-
drop doesn't work as expected. This definitely does not mean you
should abandon bindings, especially if you're using Core Data."
...and...
"When using NSTreeController, the "item" objects handed to you in
the drag-and-drop datasource methods are actually instances of the
private _NSArrayControllerTreeNode class. There's no real way to
communicate with them directly."
Seems this truly is the best way to approach the problem
currently. That is *if* you're using NSTreeController. I ended up
abandoning this approach myself because I did have some very
specific needs that still weren't addressed by this article and I
was also a bit concerned about the private API usage. I went the
datasource way with my own custom controller class.
Also, I realize in retrospect my response may have sounded
condescending - and it was, a little. :-) If your problem is that
you don't want to use private API, again, I sympathize. However, if
you want to use NSTreeController, this seems like the best (only?)
approach. IIRC, this has been discussed on this list a few times
before and I'm speaking entirely from memory on this issue. Your
mileage may vary.
--
I.S.
On Mar 14, 2006, at 8:37 AM, Darren Ford wrote:
Yup, found that one.
But it is a hack using a private API. It seems too inelegant for
Cocoa, given that the rest of the bindings stuff is quite
elegant. Having to set up a false NSOutlineViewDataSource and
returning dodgy values seems like a problem waiting to happen with
the next 10.4.x release.
Also, it appears that with this method you have to manually insert/
remove the objects from the treecontroller yourself in the
'acceptDrop' call. Given that the NSTreeController 'controls' the
objects it manages, having to write code to remove an object from
one tree branch's NSArrayController and insert it into the other
and then refresh the NSTreeController feels like I'm doing
something wrong and completely unbindings-like.
Cheers -- Darren.
On 15/03/2006, at 12:20 AM, I. Savant wrote:
On Mar 14, 2006, at 7:21 AM, Darren Ford wrote:
I've been putting together a simple app to learn how to use
NSTreeController to bind to an NSOutlineView. All's well with
basic adding/removing etc. but I've been having a few problems
getting drag and drop within the outlineview working. I've
looked through the Apple doco and on Google but haven't had any
luck.
Really? When I google "nstreecontroller drag and drop", the
very first result is a beautifully-written tutorial on the subject:
http://theocacao.com/document.page/130
Are you taking a different approach that makes this article
unusable to you? If so, you'll probably need to specify.
--
I.S.
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