Re: KVO question on Tree Controllers

FROM : Adam Gerson
DATE : Wed Apr 02 01:56:34 2008

What is bound to your NSTreeController? If its something like an
OutlineView you can have the delegate impliment
outlineViewSelectionDidChange. I tested it in my app and it does get
called when the OutlineView selection is changes to empty.

Adam


On Tue, Apr 1, 2008 at 3:11 PM, Jeff LaMarche <<email_removed>> wrote:
> I've registered to receive notifications from an NSTreeController
>  instance loaded from a nib, like so:
>
>  [treeController addObserver:self
>        forKeyPath:@"selection"
>        options:(NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld)
>        context:NULL];
>
>  I've also tried using @"selectedObjects" rather than @"selection". Now
>  this notifies me when the selection changes, except it doesn't notify
>  me if the user clicked somewhere resulting in an empty selection, nor
>  when the selection is currently empty and the user selects on the same
>  object that was previously selected.
>
>  I need to know when the selection becomes empty, not just when it
>  changes from one node to another node. Is there another keyPath or
>  notification I can register for that will do that?
>
>  TIA,
>  Jeff
>
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