[Qt] QStandardItemModel and checkbox



  • Hi all:

    I have a custom model derived from QStandardItemModel and set setCheckable(true) for each QStandardItem. the view is QTreeView.

    I want to do is whenever I click on node's checkbox, the checkState will flip between check/uncheck. other nodes(parent especially) will be Check/Uncheck/PartiallyChecked.

    tristate enabled also
    @
    Qt::ItemFlags FileSystemModel::flags(const QModelIndex & index) const
    {
    return QStandardItemModel::flags(index) | Qt::ItemIsTristate;
    }
    @

    I've try to modify value in QStandardItemModel::setData
    @
    bool FileSystemModel::setData(const QModelIndex& index, const QVariant& value, int role)
    {
    QVariant new_value=value;

    if (role==Qt::CheckStateRole) {
        auto check = static_cast<Qt::CheckState> (value.toUInt());
        if (check==Qt::PartiallyChecked)
            new_value = Qt::Unchecked;
    }
    return QStandardItemModel::setData(index,new_value,role);
    

    }
    @

    but it not work.
    any ideas?


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