Relative re-sizing of QTableWidget's columns

I am using a QTableWidget with 4-5 columns in a dialog. The dialog is resizable, I want table widget columns to resize according to dialog size i.e. if I increase dialog width, columns which are initially set with large width should expand more than the columns which were set with less width.

In short, I want relative resizing like column1 should occupy 20%, column2 occupy 50% of my table width (which increases with dialog width) and so on.

How this can be achieved for QTableWidget in Qt ?

Any solution, pointers or hints would be very helpful.

A rough solution

Code:

---

class TableWidget : public QTableWidget
{
public:
    explicit TableWidget(QWidget * parent = 0)
        : QTableWidget(parent)
    {
        setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        horizontalHeader()->setStretchLastSection(true);
    }
 
    TableWidget(int rows, int columns, QWidget *parent = 0)
        : QTableWidget(rows, columns, parent)
    {
        setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        horizontalHeader()->setStretchLastSection(true);
    }
 
protected:
    void resizeEvent(QResizeEvent * event)
    {
        if(model() and model()->columnCount())
            for(int column = 0; column < model()->columnCount(); column++)
                setColumnWidth(column, event->size().width() / model()->columnCount());
    }
};

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