Re: KVO question on Tree Controllers
Re: KVO question on Tree Controllers
- Subject: Re: KVO question on Tree Controllers
- From: "Adam Gerson" <email@hidden>
- Date: Tue, 1 Apr 2008 19:56:34 -0400
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@hidden> 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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