I have found and reported another bug in the -[NSOutlineView
autosaveExpandedItems] mechanism. Here is a brief summary of my bug report
#17728176:
Summary:
In NSOutlineView, setting autosaveExpandedItems to YES is supposed to cause the
outline to remember the expanded/collapsed state of its rows across application
launches. The documentation points out that it does this only if you implement
the -persistentObjectForItem: and -itemForPersistentObject:
NSOutlineViewDataSource methods. This mostly works correctly, but there is one
case where expanding or collapsing rows fails to call -persistentObjectForItem:
and throws the autosaveExpandedItems mechanism into an inconsistent state.
Specifically, the NSOutlineView reference document says the following with
respect to the item parameter of -[NSOutlineView expandItems:expandChildren:]:
"Starting in OS X version 10.5, passing 'nil' will expand each item under the
root in the outline view." It does expand each item as stated, but it does NOT
call the -persistentObjectForItem: datasource method, and as a result the
expanded state of all rows is not reinstated after quit and relaunch.
The only way to get an "expand all" button or menu item to persist across
relaunches is to expand each item individually in a loop, something like this::
- (IBAction)expandAllRows:(id)sender {
AWRSourceListOutlineView *outlineView = [self sourceListOutlineView];
NSIndexSet *topLevelItemIndexes = [NSIndexSet
indexSetWithIndexesInRange:NSMakeRange(0, [[self sourceListContents] count] -
1)];
[topLevelItemIndexes enumerateIndexesWithOptions:NSEnumerationReverse
usingBlock:^(NSUInteger itemIndex, BOOL *stop) {
[outlineView expandItem:[[self sourceListContents]
objectAtIndex:itemIndex] expandChildren:YES];
}];
// This alternative does not trigger the -[NSOutlineViewDataSource
persistentObjectForItem:] datasource method; bug in OS X 10.9.4 Mavericks.
// [[self sourceListOutlineView] expandItem:nil expandChildren:YES];
}
--
Bill Cheeseman - [email protected]
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