On Feb 4, 2010, at 17:29, Jens Alfke wrote: > > On Feb 4, 2010, at 5:12 PM, Laurent Daudelin wrote: > >> Just wondering, what kind of design someone acting as a datarsource for an >> NSOutlineView choose when the source of the data to be displayed is provided >> by some asynchronous means? What do you return in methods like >> 'outlineView:numberOfChildrenOfItem:' when the data hasn't been fetched yet? > > If you don't know the number yet, return zero, and kick off an async request > to get the children (or at least the number of them.) > When you find out the number of children, tell the outline view to reload the > parent item and its children. > > The best way to handle getting the children is to return a placeholder object > for any child you don't have info for yet, and then make sure you've > requested info for that child (you can collect these into batches and request > a range of children, if the protocol supports that.) Then when you receive > child info, tell the outline to reload the items for those children. > > —Jens
Jens, I thought about that and that's what I'm going to look at. Thanks! -Laurent. -- Laurent Daudelin AIM/iChat/Skype:LaurentDaudelin http://nemesys.dyndns.org Logiciels Nemesys Software laurent.daude...@gmail.com Photo Gallery Store: http://laurentdaudelin.shutterbugstorefront.com/g/galleries _______________________________________________ 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
