#include <QtGui>

class MyTableWidget : public QTableWidget
{
    Q_OBJECT
public:
    MyTableWidget(int row, int column, QWidget *parent = 0) : QTableWidget(row, column, parent)
    {
        updateTimer = new QTimer(this);
        updateTimer->setInterval(500);
        connect(updateTimer, SIGNAL(timeout()), this, SLOT(delayedUpdateScrollBar()));
    }
public slots:
    void updateScrollBar()
    {
        updateTimer->start();
    }
    void delayedUpdateScrollBar()
    {
        if (QApplication::mouseButtons() & Qt::LeftButton) // assume its still resizing
            return;
        updateTimer->stop();
        if (horizontalScrollBar()->value() == horizontalScrollBar()->maximum())
            horizontalHeader()->setOffsetToLastSection();
        else
            horizontalHeader()->setOffsetToSectionPosition(horizontalScrollBar()->value());
        viewport()->update();
    }
private:
    QTimer *updateTimer;
};

#include "main.moc"

int main(int argc, char **argv)
{
    QApplication a(argc,argv);
    MyTableWidget tw(5, 2);
    tw.connect(tw.horizontalHeader(), SIGNAL(sectionResized(int, int, int)), &tw, SLOT(updateScrollBar()));
    tw.show();
    return a.exec();
}