Question

I have an NSTreeController bound to an NSOutlineView (no core data). From Cocoa’s reference:

add:
Adds an object to the receiver after the current selection.
- (void)add:(id)sender

What’s tripping me out is that when the add method is invoked it places the new item at the end of the list, NOT after the selected item. The insert method seems to work as expected (item added before the selection). Am I doing something wrong? How does one insert a new node after the selected item and not at the end of the list?

Answer 1

Here’s what I eventually ended up doing, I implemented a Category of NSIndexPath which calculates the next index path, and used that to insert a node. Here is the Category:

@implementation NSIndexPath (additions)
(NSIndexPath *)nextIndexPath:(NSIndexPath *)startingIndexPath
{
    NSUInteger pathIndexesArray[[startingIndexPath length]];
    [startingIndexPath getIndexes:pathIndexesArray];
    pathIndexesArray[[startingIndexPath length] - 1]++;
    return [NSIndexPath indexPathWithIndexes:pathIndexesArray length:[startingIndexPath length]];
}
@end