Hi Mark, Well, the Alpha is in an NSArrayController. There's a dropdown that selects the proper Alpha. The Beta, right now, is just a pass-through to the Deltas, maybe I shouldn't have it, but in terms of the real-life objects, it needs to be there. So there's a popup box for Alphas, then I want all the Deltas to appear below it in an NSOutlineView. The deltas are the ones that have sub-items, so they're the ones I need the outline view (triangle twirls) for.
Right, I too am not sure I can do it in bindings, partly because I think the Entities return a Set and the Tree Controller might be expecting an Array. (Or vice versa, not sure.) So I will try to do it in code. But how can I code it? Where can I call the method when the Alpha is selected, is there a binding that I can connect a method to some sort of onChange for the Alpha array controller? I suppose if I can't connect an onChange, I can hook it up to a button. To test, I'll set up a button to call a method for setContent and try to reload the outline view. I'll report back with findings... thanks for the tips!! Jenny On Wed, Feb 24, 2010 at 1:17 PM, Mark Townsend <mltowns...@gmail.com> wrote: > Jenny, > > So, how are the Alphas and Betas displayed? Are they in > NSArrayControllers? > > What does your UI look like? > > What do you want your root nodes to be? Deltas or Betas? > > What you might try is when you select the Alpha, call setContent: on > NSTreeController passing in the Alpha.Beta.Deltas array, then reload the > outlineview. Take the the binding for the tree controller though. I think > that the way that you have your model set up it won't work through > bindings. But I'm not totally sure. > > > --- > Mark Townsend > http://www.markltownsend.com > > > On Wed, Feb 24, 2010 at 12:01 PM, Jenny M <safflo...@gmail.com> wrote: > >> Hi Mark, >> >> Thanks so much for the tip, unfortunately that's not the case. The Delta's >> parent/children relationships point to fellow Deltas. It has a different >> relationship (a "beta") that points to the beta. The entities aren't >> inherited from one another, they're just chained together. Each Alpha has a >> Beta and each Beta has multiple Deltas, but not as parent/children. The >> Deltas have parent/children of each other - those are the entities I'm >> trying to display in an outline view. >> >> My confusion comes from where to set the set of Deltas. I know the >> currently selected Alpha, so I should be able to use that to chain down to >> the Deltas. But every Tree Controller example I've seen just uses the >> predicate to display ALL the objects of an entity... so I'm trying to set it >> in the bindings and coming up empty... :/ >> >> Jenny >> >> >> >> >> >> On Wed, Feb 24, 2010 at 11:16 AM, Mark Townsend <mltowns...@gmail.com>wrote: >> >>> Jenny, >>> >>> I think what you want is to set the Entity on the NSTreeController to be >>> the Alpha entity, not Delta. >>> >>> The predicate 'parent == nil' will only give you back Delta objects where >>> parent == nil. From what you've said, this will never be true as the Alpha >>> objects are your top level objects. >>> >>> Alpha (parent == nil) >>> | >>> |->Beta (parent == Alpha) >>> | >>> |->Delta (parent == Beta) >>> |->Delta (parent == Beta) >>> >>> --- >>> Mark Townsend >>> http://www.markltownsend.com >>> >>> >>> On Wed, Feb 17, 2010 at 7:38 PM, Jenny M <safflo...@gmail.com> wrote: >>> >>>> Sorry, realizing that the object chain isn't quite right. The Alpha- >>>> Beta relationship is one to one, NOT many to one. Each alpha has one >>>> beta, and one beta has multiple deltas. (I have multiple alpha >>>> objects, hence my initial comment of multiple, but the relationship is >>>> one-to-one.) >>>> >>>> >>>> On Feb 17, 7:22 pm, Jenny M <safflo...@gmail.com> wrote: >>>> > My objects are chained like: >>>> > Alpha (multiple) -> Beta (one) -> Delta (multiple) (delta has >>>> > references to itself via parent and children relationships) >>>> _______________________________________________ >>>> >>>> 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/mltownsend%40gmail.com >>>> >>>> This email sent to mltowns...@gmail.com >>>> >>> >>> >> > _______________________________________________ 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
