QAbstractListModel returning undefined when cleared and repopulated



  • I have a class derived from QAbstractListModel that is connected to a ListView. When another ListView changes, I need to change the contents of the Model. I can successfully make the alterations to the model and update the ListView. However, I get an undefined being returned at some point in the update. Don't know that it's a big deal since everything works. But it tweeks me. I want to confirm it's what I think. The clearing of the model returns an empty list before the next updates. Is there a better way to set this up? There seems to be no way to clear a ListView and repopulate it easily, that I've found.

        beginRemoveRows(this->index(_currentList.size()), 0, _currentList.size());
        _currentList.clear();
        endRemoveRows();
    
        beginInsertRows(this->index(0), 0, _durationList[ts->string()].size());
        _currentList = _durationList[ts->string()];
        endInsertRows();
    

  • Lifetime Qt Champion

    Hi and welcome to devnet,

    Since you are nuking the whole content and adding new stuff, the beginResetModel/endResetModel pair would likely make more sense here.



  • Great, thanks. Missed that in the docs.


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