On Tue, Oct 18, 2011 at 12:19 AM, Quincey Morris <quinceymor...@rivergatesoftware.com> wrote: > On Oct 17, 2011, at 19:58 , Koen van der Drift wrote: > > What it should look like is: > > LIBRARY (static) > Group1 > Group2 > > > FAVORITES (static) > Group3 > Group4 > > RECENT (static) > > You've missed something basic. In the above example (modeled as you > previously explained on the source lists in iTunes and Mail), there are > multiple levels of hierarchy of the data that represents the list content. > At the root level is the root item, which is represented by a nil NSOutline > item in your data source methods. It doesn't get displayed, but its children > do. If you're using a tree controller, this root level doesn't exist. > At the next level are the content groupings, of which there are 3: Library, > Favorites and Recent. This is the topmost level when using a tree > controller. > At the next level are the children of the content groupings. Group1 and > Group2 are children of Library; Group3 and Group4 are children of Favorites; > Recent has no children. > Below those levels, your groups may have their own children. > What you're mis-calling "static groups" are actually parent items of the > real group items. The reason there are no disclosure triangles is that these > top-level groups are *always* expanded, and have their disclosure triangle > suppressed via the delegate method I mentioned in an earlier email.
Thanks for the explanation, I now see what I did wrong. As I mentioned before, when my app starts the first time, I would like to have the outline view be prepopulated with a few groups: LIBRARY, FAVORITES, RECENT and maybe Group1 (a child of LIBRARY). I did all that, but did not add Group1 to be a child of LIBRARY, so I will do that too. Am I correct in doing this through an NSFetchRequest, for an entity @"Group" with a predicate @"Library"? > Also, regarding sorting of items at the same level, if there is no sort > descriptor in control, the order of the items is the order in which your > data source methods associate items with child indexes (if you're using a > data source) *or* the order of the child item array in each parent (if > you're using a tree controller). > Do you mean that if I create the 'static' items in the order I want them to be displayed (LIBRARY - FAVORITES - RECENT), that's the order in which they always will be displayed? Thanks again, - Koen. _______________________________________________ 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
