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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