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QxMainDialog::QxMainDialog()
{
	connect(TableParam, SIGNAL(itemChanged(QTableWidgetItem *)),this,SLOT(itemChanged(QTableWidgetItem *)));
}
...
void QxMainDialog::itemChanged ( QTableWidgetItem * item )
{
	if(item->column()==3){ // выбираю третий столбец
		QString localbuf = item->text();
		qDebug() << localbuf;
		item->setData ( Qt::DisplayRole, QString::QString ( localbuf.size(), '*' ) );
	}
}

TrackDelegate::TrackDelegate(int durationColumn, QObject *parent)
    : QItemDelegate(parent)
{
    this->durationColumn = durationColumn;
}

QWidget *TrackDelegate::createEditor(QWidget *parent,
        const QStyleOptionViewItem &option,
        const QModelIndex &index) const
{
    if (index.column() == durationColumn) {
		QLineEdit *lineEdit = new QLineEdit(parent);
		lineEdit->setEchoMode(QLineEdit::Password);
        return lineEdit;
    } else {
        return QItemDelegate::createEditor(parent, option, index);
    }
}

void TrackDelegate::paint(QPainter *painter,
                          const QStyleOptionViewItem &option,
                          const QModelIndex &index) const
{
    if (index.column() == durationColumn) {
        QString text = index.model()->data(index, Qt::DisplayRole).toString();
        QString buf(text.size(),'*');

        drawDisplay(painter, option, option.rect, buf);
        drawFocus(painter, option, option.rect);
    } else{
        QItemDelegate::paint(painter, option, index);
    }
}