On Dec 27, 2008, at 11:19 AM, Markus Spoettl wrote:
The crash goes away. However, I have a feeling that this may be pure coincidence. Even more so as the crash also goes way if the node inserted is not on that particular location in the tree or if another node gets inserted somewhere else first. All very strange.
This of course turned out to be a fluke and the crash reappeared promptly with a slightly different tree configuration.
Turns out - not very surprisingly - that I'm doing something that the outline doesn't like: The outline view is bound via a NSTreeController and I'm observing the controller's -arrangedObjects property. When a KVO notification is delivered, I go through the outline and expand certain nodes. This all works well except for when the tree gets sorted. This causes an KVO notification but apparently the outline doesn't like to get its tree nodes expanded at this stage.
I've done some digging with NSZombieEnabled and CFZombieLevel and it appears that NSOutlineView releases an internal treenode due to the sorting which is still accessible (but garbage) via -itemAtRow: When this happens I get this console entry
12/28/08 1:38:37 PM myApp[8993] *** -[NSTreeControllerTreeNode retain]: message sent to deallocated instance 0x166e0920
In the course of debugging this I also got assertions in AppKit:12/28/08 12:41:54 PM myApp[8615] *** Assertion failure in - [_NSBindingAdaptor outlineColumn:willDisplayCell:row:], /SourceCache/ AppKit/AppKit-949.43/Binding.subproj/_NSBindingAdaptor.m:759
I guess I can understand that things get complicated when you mess with the expanded items during a sort which changes the nodes arrangements. Fair enough.
The question is how can I ensure a certain node stays expanded when its root nodes array gets sorted programatically. Apparently NSOutlineView throws away all the nodes that are being sorted and creates new ones which makes it loose the expanded state.
Hints appreciated! Regards Markus -- __________________________________________ Markus Spoettl
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