How to set and use setdata() to add new data to custom QAbstractTableModel

[Dimis]

Hi all,

I've created my custom model subclassing the QAbstractTableModel which is populated in a QTableView. I've re-implemented the necessary functions but something I do wrong obviously and the setdata function doesn't work. Below is my code, please could you help me with this?

header file for custom model:

class tablemodel : public QAbstractTableModel
{
    Q_OBJECT

public:
    
        tablemodel(QObject *parent=0);
    
        int columnCount(const QModelIndex & parent = QModelIndex()) const override;
    
        int rowCount(const QModelIndex & parent = QModelIndex()) const override;
    
        QVariant data(const QModelIndex & index, int role=Qt::DisplayRole) const override;
   
    
        bool insertRows(int position, int rows, const QModelIndex &parent = QModelIndex()) override;
    
        bool removeRows(int position, int rows, const QModelIndex &parent = QModelIndex()) override;
    
        bool setData(const QModelIndex &index, const QVariant value, int role);
    
        Qt::ItemFlags flags(const QModelIndex &index) const;
};

source file for model and functions definitions:

tablemodel::tablemodel(QObject * parent /* = 0*/)
    : QAbstractTableModel(parent)
{
}

int tablemodel::columnCount(const QModelIndex &/*parent = QModelIndex()*/) const
{
    return 3;
}
int tablemodel::rowCount(const QModelIndex & /* parent = QModelIndex()*/) const
{
    return 1;
}

QVariant tablemodel::data(const QModelIndex & index, int role) const
{
     int row=index.row();
     int col=index.column();
    if (role == Qt::DisplayRole)
       {
        return    QString("%1, %2")
                      .arg(row + 1)
                      .arg(col +1);
       }
    return QVariant();
}


bool tablemodel::insertRows(int position, int rows, const QModelIndex &parent)
{
   rows=1
        beginInsertRows(parent, position, position + rows - 1);
        endInsertRows();
        return true;
}

bool tablemodel::removeRows(int position, int rows, const QModelIndex &parent)
{
       beginRemoveRows(QModelIndex(), position, position + rows - 1);
       endRemoveRows();
       return true;
}

bool tablemodel::setData(const QModelIndex &index, const QVariant value, int role)
{ 
    if (index.isValid() && role == Qt::EditRole)
        {
            int row = index.row();

            value.toString()="enter test text";

            emit dataChanged(index, index);
            return true;
        }
        return false;
}

Qt::ItemFlags tablemodel::flags(const QModelIndex &index) const
{
    return QAbstractItemModel::flags(index) | Qt::ItemIsEditable;
}

and in the mainwindow source file, I have a button which inserts a new row in the tableview and add the new text but the setdata() for adding the text doesn't actually works:

void MainWindow::insert_btn_released()
{
  QModelIndex selectedRow = table->selectionModel()->currentIndex();

    mymodel->insertRows(selectedRow.row(),1);
    qDebug() << " SELECTED ROW " << selectedRow.row();
   QModelIndex newidx = mymodel->index(selectedRow.row()+1,0);

   mymodel->setData(newidx,"test text",Qt::DisplayRole);

}

Please any help would be really appreciated.

Thank you in advance.

[jsulm]

@Dimis said in How to set and use setdata() to add new data to custom QAbstractTableModel:

value.toString()="enter test text";

What is this line supposed to do?
You're assigning to a temporary value...

[Dimis]

I was trying to assign some text in the value variable in order to be displayed.

[VRonin]

I don't think you got the model design concept at all. Have a read of chapters 3 and 4 of Advanced Qt Programming or just use QStandardItemModel and end your pain