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: Darren Ford <email@hidden>
- Date: Wed, 15 Mar 2006 09:44:12 +1100
Ok, I think you guys have made up my mind for me :-) I have an
existing App that uses an NSTableView/NSArrayController for managing
items which I was hoping to change to an NSOutlineView/
NSTreeController to allow hierarchical data, but I think that I'll
wait until it gets updated with trying to convert it across. I rely
kinda heavily on bindings for data display, and when I started
looking at the effort required to revert to using datasource methods
for the NSOutlineView it seemed like a backwards step.
Cheers all -- Darren.
On 15/03/2006, at 2:13 AM, I. Savant wrote:
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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