Wil Shipley's NSOutlineView (DMExtensions)

NSOutlineView-DMExtensions.h

//  NSOutlineView-DMExtensions.h
//  Library
//
//  Created by William Shipley on 3/10/06.
//  Copyright 2006 Delicious Monster Software, LLC. Some rights reserved,
//    see Creative Commons license on wilshipley.com

#import <Cocoa/Cocoa.h>

@interface NSOutlineView (DMExtensions)
- (id)realItemForOpaqueItem:(id)opaqueItem;
@end

NSOutlineView-DMExtensions.m

//  NSOutlineView-DMExtensions.m
//  Library
//
//  Created by William Shipley on 3/10/06.
//  Copyright 2006 Delicious Monster Software, LLC. Some rights reserved,
//    see Creative Commons license on wilshipley.com

#import "NSOutlineView-DMExtensions.h"

@interface NSOutlineView (DMExtensions_Private)
- (NSTreeController *)_treeController;
- (id)_realItemForOpaqueItem:(id)findOpaqueItem outlineRowIndex:(int *)outlineRowIndex
					   items:(NSArray *)items;
@end


@implementation NSOutlineView (DMExtensions)

- (id)realItemForOpaqueItem:(id)opaqueItem
{
	int outlineRowIndex = 0;
	return [self _realItemForOpaqueItem:opaqueItem outlineRowIndex:&outlineRowIndex
								  items:[[self _treeController] content]];
}

@end


@implementation NSOutlineView (DMExtensions_Private)

- (NSTreeController *)_treeController;
{
	return (NSTreeController *)[[self infoForBinding: @"content"]
								objectForKey:@"NSObservedObject"];
}

- (id)_realItemForOpaqueItem:(id)findOpaqueItem outlineRowIndex:(int *)outlineRowIndex
					   items:(NSArray *)items;
{
	unsigned int itemIndex;
	for (itemIndex = 0; itemIndex < [items count] && *outlineRowIndex < [self numberOfRows]; itemIndex++) {
		id realItem = [items objectAtIndex:itemIndex];
		id opaqueItem = [self itemAtRow:*outlineRowIndex];
		(*outlineRowIndex)++;
		if (opaqueItem == findOpaqueItem) {
			ZNExit;
			return realItem;
		}
		if ([self isItemExpanded:opaqueItem]) {
			realItem = [self _realItemForOpaqueItem:findOpaqueItem outlineRowIndex: outlineRowIndex
											  items:[realItem valueForKeyPath:[[self _treeController] childrenKeyPath]]];
			if (realItem) {
				return realItem;
			}
		}
	}
	return nil;
}

@end