Hi there,
I've been having intermittent unexplained out of bounds errors when
inserting new items into an NSOutlineView.
Here's a snippet from my controller's update method (triggered by a KVO
notification) that should explains the sort of problem I've been having.
This class it's from is the delegate and data source for the outline view.
if ([insertedSet count] > 0) {
NSIndexSet* insertedIndexes = [newContentArray
indexesOfObjectsPassingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop) {
return [insertedSet containsObject:obj];
}];
NSLog(@"%d", (int)[self outlineView:_outlineView
numberOfChildrenOfItem:parentItem]); // => 1
NSLog(@"%@", insertedIndexes); // => { 1 }
[_outlineView insertItemsAtIndexes:insertedIndexes inParent:
parentItem withAnimation:NSTableViewAnimationSlideDown]; // => Exception
here
}
The exception I'm getting is "NSOutlineView error inserting child indexes
<NSIndexSet: 0x1018e3bf0>[number of indexes: 1 (in 1 ranges), indexes: (1)]
in parent 0x101850920 (which has 0 children)".
So it looks like NSOutlineView's internal state is somehow getting out of
sync with my controller class.
I think I have it tracked down to the fact that I didn't want the first
bunch of content displayed to animate in, so I had the following at the
beginning of the method:
if (_flags.isSettingContent) {
[_outlineView reloadItem:parentItem];
return;
}
Replacing it with:
if (_flags.isSettingContent) {
[_outlineView insertItemsAtIndexes:insertedIndexes inParent:parentItem
withAnimation:NSTableViewAnimationEffectNone];
return;
}
seems to fix the problem. Problem is, I'm not sure why it fixes it... A
simple test case didn't seem to reproduce the issue.
Has anyone noticed any differences in behaviour between these two ways of
updating an outline view?
Thanks
Chris
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