Switching/moving rows in a model

[gri]

Hello,

I'm trying to implement "move up" and "move down" for items in my model. I'm not using a QSortFilterProxyModel and I won't.

Is there a working way to do this?

From my understanding what the docs tell me, I would have to exchange the first row index with the second one and vice versa. But it won't work.

emit layoutAboutToBeChanged();
 
QModelIndex from = ...;
QModelIndex to = ...;
 
changePersistentIndex(from, to); // This call overwrites and does not exchange?
changePersistentIndex(to, from);
 
emit layoutChanged();

emit layoutAboutToBeChanged();

QModelIndex from = ...;
QModelIndex to = ...;

changePersistentIndex(from, to); // This call overwrites and does not exchange?
changePersistentIndex(to, from);

emit layoutChanged();

To copy to clipboard, switch view to plain text mode 

Thanks.