NSOutlineView Changing disclosure Image

Question

I my outline view, i am adding Custom cell, To drawing custom cell, i am referring example code , present in the Cocoa documentation

http://www.martinkahr.com/2007/0

Answer 1

After researching this issue myself, and trying some of the answers here, I have found that the other approaches mentioned will work, but will require that you perform a lot more manual intervention in order to avoid screen artifacts and other strange behavior.

The simplest solution I found is the following, which should work in most cases.

This solution has the added benefit of the system automatically handling a great many other cases, such as column movement, etc, without your involvement.

- (void)outlineView:(NSOutlineView *)outlineView willDisplayOutlineCell:(id)cell
     forTableColumn:(NSTableColumn *)tableColumn
               item:(id)item
{
    [cell setImage:[NSImage imageNamed: @"Navigation right 16x16 vWhite_tx"]];
    [cell setAlternateImage:[NSImage imageNamed: @"Navigation down 16x16 vWhite_tx"]];
}

In your case, you would wrap this up with your class detection logic, and set the cell images appropriately for your cases.