Re: [NSOutlineView] Saving/Restoring the hierarchy disclosure state (Reloaded)

Subject: Re: [NSOutlineView] Saving/Restoring the hierarchy disclosure state (Reloaded)
From: Jonathan Dann <email@hidden>
Date: Thu, 26 Jun 2008 19:29:48 +0100
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Here's what I do:

@"isExpanded" is a persistent attribute of my model objects.

In the delegate

- (void)outlineViewItemDidExpand:(NSNotification *)notification; { [[[[notification userInfo] valueForKey:@"NSObject"] representedObject] setValue:[NSNumber numberWithBool:YES] forKey:@"isExpanded"]; }

- (void)outlineViewItemDidCollapse:(NSNotification *)notification; { [[[[notification userInfo] valueForKey:@"NSObject"] representedObject] setValue:[NSNumber numberWithBool:NO] forKey:@"isExpanded"]; }

In an NSOutlineView subclass

- (void)reloadData;
{
	[super reloadData];
	NSUInteger row;
	for (row = 0 ; row < [self numberOfRows] ; row++) {
		NSTreeNode *item = [self itemAtRow:row];
		if ([[item representedObject] isMemberOfClass:[ESGroupNode class]])
			if ([[[item representedObject] valueForKey:@"isExpanded"] boolValue])
				[self expandItem:item];
	}
}


works like a charm

Jon

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References:
	>[NSOutlineView] Saving/Restoring the hierarchy disclosure state (Reloaded) (From: Stéphane Sudre <email@hidden>)

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