I've been looking at QQmlListModel::sync() (found in qtdeclarative/src/qml/types/qqmllistmodel.cpp) (looking at v5.11) for quite some time and haven't been able to figure out how it can work. I'm still trying to come up with a terse explanation of how I think the function behaves and a circumstance where it fails to do the correct thing.
In the mean time, it appears to me that `beginInsertRows()` and `beginMoveRows()` are called after the underlying model is changed. I thought that wasn't allowed. > When reimplementing insertRows() in a subclass, you must call this function > before inserting data into the model's underlying data store. https://doc.qt.io/qt-5/qabstractitemmodel.html#beginInsertRows I assume the same about `beginMoveRows()` but it's not actually clear to me. However `endMoveRows()` does say: > When implementing a subclass, you must call this function after moving data > within the model's underlying data store. https://doc.qt.io/qt-5/qabstractitemmodel.html#endMoveRows Presumably that doesn't mean "any time before" but specifically between beginMoveRows and endMoveRows. And, as I understand it, it doesn't matter that it's in a subclass except in so far as the subclass tends to be the caller and has access to the protected underlying data store. Am I misunderstanding anything here so far? Also, are there tests for this? The only test I could find related to this had to do with making sure some function was only callable from a QML worker script. _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
