[Qt-interest] model->insertColumns() is inserting row instead

[Neel Basu]

I am just playing with Qt and for that I made a MarkSheetModel that inherits 
from QAbstractTableModel. and I am using a Standerd QTableView for 
representation purpouse.
 This is My MarkSheetTableModel Header.

class MarkSheetTableModel : public QAbstractTableModel{
        public:
                MarkSheetTableModel(QObject* parent=0);
                ~MarkSheetTableModel();
        private:
                QList<QString> subjects;//Headers Come from Here
                QHash<QString, QList<double>* > students;//each student and 
their corresponding marks make a row
        public:
                QList<double>& addStudent(const QString& stdName);
                QList<double>& student(const QString& stdName);
        public:
                int rowCount(const QModelIndex& parent) const;
                int columnCount(const QModelIndex& parent) const;
                QVariant data(const QModelIndex& index, int role) const;
                QVariant headerData(int section, Qt::Orientation orientation, 
int role) const;
};

everythings goes fine.
 
 Now I want two Extra Column Total and Avarage, as these two does not hold a 
concreate data I don't want these two to come from the Model (These two should 
be 
representation oriented columns).so I searched a lot to insert a Column on 
View (at 
least a psudo Column) But I didn't get one.
 What I got is insertColumn() method on Model (although Idont think it 
shouldbe added to column but I've no other way I think) .
 
 Here goes my MainWindow's Constructor's code.

MainWindow::MainWindow(QWidget *parent, Qt::WFlags flags): QMainWindow(parent, 
flags), vHeadersBrush(QColor(0, 0, 255, 127)), hHeadersBrush(QColor(0, 255, 
0, 127)), mAutoRecalculateStatus(true){
        ui.setupUi(this);
        markSheetTableModel = new MarkSheetTableModel;
        markSheetTableModel->addStudent("Ram") << 50 << 85 << 86.50 << 75.25;
        markSheetTableModel->addStudent("Shyam") << 55 << 80 << 86 << 85;
        markSheetTableModel->insertColumns(0, 1);//Inserting one Column I've 
triedinsertColumns() which gave the same result too
        markSheetTableModel->addStudent("Total");//Setting Header for that 
Column.
        ui.markSheetTableView->setModel(markSheetTableModel);
}

But this above code inserts a Row called Total instead
I am kinda stuck at this point somebody please Help me out.