Re: NSArrayController/TreeController out of bounds
Re: NSArrayController/TreeController out of bounds
- Subject: Re: NSArrayController/TreeController out of bounds
- From: "Ian G. Gillespie" <email@hidden>
- Date: Thu, 10 Nov 2005 09:05:19 -0500
I tried the workaround mentioned below, but when I had the children
key path I can't even add items to the selection--bound list. It
seems that 10.4.3 has introduced some nasty bugs in NSTreeController
and/or CoreData. For those that want to see the test application,
you can get it here www.iggsoft.com/Test2.zip
To illustrate the bug where you can NOT add items to the selected
object on the right, add "childrenCount" as the key path to the
"Items" tree controller in IB. If this key path is not their (as the
default when you download it) everything works as expected, accept of
course for the bug mentioned in the original email.
FROM : Jeffrey J. Early
DATE : Tue Nov 08 23:14:48 2005
I figured out a work around for this problem.
I first confirmed that binding an NSArrayController's ContentArray
to the
arrangedObjects of another NSArrayController does work, whereas
doing the
same with an NSTreeController does not.
Simply by adding the optional "Count key path" to the
NSTreeController fixed
the problem. Somehow despite the NSTreeController getting a KVO
notification
that the arrangedObjects changed and hence knowing to reload the
objects, it
fails to update its count of the array, whereas the optional count
binding
forces the change.
Anyway, maybe this is expected behavior, but regardless, I now have
a work
around.
Thanks,
Jeffrey
on 11/6/05 1:26 PM, Jeffrey J. Early at <email_removed> wrote:
> Howdy all --
>
> For various reasons, I'm trying to bind an NSTreeController's
"ContentArray"
> to the "arrangedObjects" of an NSArrayController. The primary
reason being
> that I want to sort the objects in the NSArrayController, have the
> NSTreeController list the root objects in that order, but let the
children
> objects be sorted in a separate sort pattern.
>
> The problem that I'm running into is that the NSTreeController
doesn't seem
> to get key-value notification that the NSArrayController's
"arrangedObjects"
> have changed, whether just sorted or swapped out all together.
>
> I've made a fairly reduced test case. Run the app, click
"Generate new
> function". One function is generated with four "subfunctions" and
another
> with one subfunction. If you view the first function, and then
the second,
> you'll find that NSTreeController goes out of bounds on its array
and throws
> an error.
>
> To see how everything works without the tree controller, simply
unbind the
> NSTreeController's "ContentArray" and run it again.
>
> http://oregonstate.edu/~earlyj/NSArrayControllerDebug.zip
>
> Anybody see what's wrong and causing this to happen?
>
> Thanks for any help,
> Jeffrey
>
> PS - This test case is actually modified from one where I was
assessing
> CoreData performance issues. I'll post my findings and real test
case for
> that shortly here....
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