I'm beginning to wonder if it's possible to save and restore the
current disclosure state of the hierarchy of a NSOutlineView.
- Iterating the hierarchy does not save the state of hidden children.
- the persistentObject API is not useful in my case as I have
multiple instances of the same NSOutlineView through multiple
documents and I don't need/want to keep this piece of information in
the defaults.
- When asked about this, the NSOutlineView oracle suggested to use
the notification methods:
- (void)outlineViewItemWillExpand:(NSNotification *)notification;
- (void)outlineViewItemDidExpand:(NSNotification *)notification;
- (void)outlineViewItemWillCollapse:(NSNotification *)notification;
- (void)outlineViewItemDidCollapse:(NSNotification *)notification;
Unfortunately, this does not work as when you close a branch,
every child of this branch receives the willCollapse and didCollapse
notifications (Mac OS X 10.4.11).
Looking for other suggestions (if any left).
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