On Oct 13, 2011, at 13:44 , Luc Van Bogaert wrote: > Thanks, I got this working in one 'direction', ie. when the selection in the > table is changed, this is reflected in my UI and the 'selected' Dot objects > are drawn in a different color. For this, I decided to use a > NSMutableIndexSet 'dotSelectionIndexes' property in my model object, bound to > the array controller's 'selectionIndexes' binding.
… bound *from* … ;) > But I'm afraid this still remains a little blurry on how to get the binding > work in the other direction. Meaning, I would like to click a Dot object in > my UI to select it, and this should change the selection in the table, > resulting in turn in the Dot being redrawn with a different color. > > I was hoping that by just adding or replacing the contents of my > 'dotSelectionIndexes' ivar (hence the choice for a NSMutableIndexSet) with > the index of the clicked Dot, would trigger a selection change in the table > because of the binding. It seems this doesn't work. So, obviously I'm still > missing something. So close! A simple NSMutableIndexSet property isn't KVO compliant, but the array controller bound *to* it is watching with KVO, so the thing fizzles. Use a NSIndexSet property instead of a NSMutableIndexSet, and change the property by assigning it a new (immutable) index set -- that is, via the setter. This means that you'll create many NSIndexSet objects at times, but unless you have vast numbers of Dot objects this is not likely to make a measurable impact on performance. If it did, it's not that hard to use a NSIndexSet property backed by a NSMutableIndexSet ivar, along with some non-standard non-KVC accessors your Dot objects would use to update the property, but you'd have to generate the requisite KVO notifications manually, and write a custom setter. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
