RE: mmalc's FilteringArrayController and NSTreeController issues
RE: mmalc's FilteringArrayController and NSTreeController issues
- Subject: RE: mmalc's FilteringArrayController and NSTreeController issues
- From: Keith Blount <email@hidden>
- Date: Mon, 20 Jun 2005 14:16:04 -0700 (PDT)
Sorry, I made a mistake in my earlier post -
NSTreeController's -content method *does* return a
legitimate array. However, this array is of the bound
objects, *not* of _NSControllerTreeProxy items, so it
still doesn't providing a way of converting back to a
required item in
-outlineView:itemForPersistentObject:.
I've still made no progress on figuring a way to
filter NSTreeController either - I cannot find any
reference on how to do this anywhere.
Any advice much appreciated.
Thanks,
Keith
FROM : Keith Blount
DATE : Mon Jun 20 19:01:58 2005
Sorry to reply to my own question and to have gone on
about NSTreeController so much recently, but I feel
like I'm headbutting a wall at the moment. Does no one
have any idea of how to do this (see post pasted at
bottom)?
I am starting to see the beauty of NSTreeController,
but the difficulty of subclassing it to display only
certain objects is defeating me.
I am also having another, sort-of-related problem:
does anybody know how to iterate through an
NSTreeController to get its objects? Using its
-contents or -arrangedObjects methods doesn't seem to
work (they don't even seem to return proper arrays).
In particular, I am still trying to implement
NSOutlineView's datasource
-outlineView:persistentObjectForItem: and
-outlineView:itemForPersistentObject: methods. The
problem with these methods, as has been discussed here
elsewhere, is that the item passed in is a private
_NSTreeControllerProxy object (or some such). I can
use the private API method -observedObject to get the
represented object for
-outlineView:persistentObjectForItem:, but
transferring this back to an _NSTreeControllerProxy
(or whatever it is called) for
-outlineView:itemForPersistentObject: object seems
impossible.
Many thanks in advance,
Keith
FROM : Keith Blount
DATE : Sun Jun 19 12:40:00 2005
Hello,
I am trying to work out how to get an NSTreeController
to display only certain objects. As far as I can see,
mmalc's FilteringArrayController at
http://homepage.mac.com/mmalc/CocoaExamples/controllers.html
does exactly what I want to do except that
FilteringArrayController is a subclass of
NSArrayController and I would need to subclass
NSTreeController.
However, FilteringArrayController overrides
NSArrayController's -arrangeObjects: method - and
NSTreeController has no such method to override.
Does anybody know how to do something similar for
NSTreeController? The docs mention overriding
insertObject:atArrangedObjectIndexPath: but it says
this for NSArrayController too.
Many thanks for any hints,
Keith
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