Den 22-08-2012 20:29, Stephen Chu skrev: > Thanks to everyone who helped on the 64-bit internal ID question I > posted. I end up maintaining a copy of index-and-id mapping to work > around it. > > Now I have a question on how to properly update the model. My model is a > read-only representation of a database. I am using a QTreeView to hold > the model. The data themselves are not tree-like but I like the visual > of QTreeView better. > > The model needs to update itself periodically from the remote database. > I keep a QList of data IDs and rebuild the list every time I get a new > snapshot from the database. > > What's the recommended way to reflect the changes to the view? I need to > keep the current selection and scroll position of the QTreeView between > updates. > > Do I reset the model? Or do I remove deleted rows and insert new ones?
If you reset the model, you will destroy selection and scroll info. Easy, but bad. Again :) You have to do the beginDeleteRows(...) and beginInsertRows(...) stuff and emit dataChanged for existing rows that changed values. Bo Thorsen, Fionia Software. -- Expert Qt and C++ developer for hire Contact me if you need expert Qt help http://www.fioniasoftware.dk _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
