qt q3table eat sectionHandleDoubleClicked - qt

Question

i am using q3Table.
i want to expand the column width to max item width by double click the edge of the header
while trying to connect to h3Header::sectionHandleDoubleClicked
i found in Q3Table code that it override the header double click event and not emitting the signal.
class Q_COMPAT_EXPORT Q3TableHeader : public Q3Header
{
void mouseDoubleClickEvent(QMouseEvent *e);
...
void Q3TableHeader::mouseDoubleClickEvent(QMouseEvent *e)
{
if (e->button() != LeftButton)
return;
if (isResizing) {
int p = real_pos(e->pos(), orientation()) + offset();
int section = sectionAt(p);
if (section == -1)
return;
section--;
if (p >= sectionPos(count() - 1) + sectionSize(count() - 1))
++section;
while (sectionSize(section) == 0)
section--;
if (section < 0)
return;
int oldSize = sectionSize(section);
if (orientation() == Horizontal) {
table->adjustColumn(section);
int newSize = sectionSize(section);
if (oldSize != newSize)
emit sizeChange(section, oldSize, newSize);
for (int i = 0; i < table->numCols(); ++i) {
if (table->isColumnSelected(i) && sectionSize(i) != 0)
table->adjustColumn(i);
}
} else {
table->adjustRow(section);
int newSize = sectionSize(section);
if (oldSize != newSize)
emit sizeChange(section, oldSize, newSize);
for (int i = 0; i < table->numRows(); ++i) {
if (table->isRowSelected(i) && sectionSize(i) != 0)
table->adjustRow(i);
}
}
}
}
as in the original q3Header a signal is emitted.
void Q3Header::mouseDoubleClickEvent(QMouseEvent *e)
{
int p = orient == Qt::Horizontal ? e->pos().x() : e->pos().y();
p += offset();
if(reverse())
p = d->lastPos - p;
int header = handleAt(p);
if (header >= 0)
emit sectionHandleDoubleClicked(header);
}
how can i get the same effect as sectionHandleDoubleClicked?
or how can i achieve this effect?