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: "I. Savant" <email@hidden>
- Date: Tue, 14 Mar 2006 10:13:19 -0500
Oh, in addition, I wanted to say that this still won't help much
for those trying to target 10.4. It's doubtful such a request will be
fulfilled in any 10.4 updates. Even if they *don't* wait 'til 10.5 to
make at least that method public, your app still depends on a
specific 10.4.x update to use it properly. This creates a lot of
additional maintenance work to make sure your code handles these
differences gracefully and adds support difficulties when a clueless
user tries to run it and doesn't know what you mean when you ask,
"are you running 10.4.8 or above?". :-D The less hand-holding and
extra coding I have to do to make sure something works properly, the
more "profitable" the shareware business is for me.
These are the complications I decided to avoid when I abandoned
NSTreeController for my app's upcoming incarnation. Not that
NSTreeController is useless, it's just not useful to me for this
particular problem. I suspect the same may be true for the OP, if
using private API is a primary concern.
--
I.S.
On Mar 14, 2006, at 9:57 AM, Keith Wilson wrote:
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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