Renumbering Row Headers of QHeaderView

[mclark]

Thanks for the quick reply.

Using QTableView is currently not an option because of time restraints. After the release of the product, we will try to convert all our QTableWidget code to QTableView for subsequent releases.

We may have to leave this feature out of this release.

[jpn]

You could connect to signal QHeaderView::sectionMoved() and rename headers every time a section movement occurs. Just make sure you create and set header items.

// it is important to create and set header items
// otherwise horizontalHeaderItem(int) and verticalHeaderItem(int) will always return 0
for (int r = 0; r < rowCount(); ++r)
{
	QTableWidgetItem* item = new QTableWidgetItem(QString::number(r));
	setVerticalHeaderItem(r, item);
}
 
for (int c = 0; c < columnCount(); ++c)
{
	QTableWidgetItem* item = new QTableWidgetItem(QString::number(c));
	setHorizontalHeaderItem(c, item);
}
 
connect(horizontalHeader(), SIGNAL(sectionMoved(int, int, int)), SLOT(renameHeaders()));
connect(verticalHeader(),   SIGNAL(sectionMoved(int, int, int)), SLOT(renameHeaders()));

// it is important to create and set header items
// otherwise horizontalHeaderItem(int) and verticalHeaderItem(int) will always return 0
for (int r = 0; r < rowCount(); ++r)
{
	QTableWidgetItem* item = new QTableWidgetItem(QString::number(r));
	setVerticalHeaderItem(r, item);
}

for (int c = 0; c < columnCount(); ++c)
{
	QTableWidgetItem* item = new QTableWidgetItem(QString::number(c));
	setHorizontalHeaderItem(c, item);
}

connect(horizontalHeader(), SIGNAL(sectionMoved(int, int, int)), SLOT(renameHeaders()));
connect(verticalHeader(),   SIGNAL(sectionMoved(int, int, int)), SLOT(renameHeaders()));

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// the slot doing the renaming
void TableWidget::renameHeaders()
{
	// "convert" logical indexes to visual indexes
	for (int r = 0; r < rowCount(); ++r)
		verticalHeaderItem(r)->setText(QString::number(verticalHeader()->visualIndex(r)));
 
	for (int c = 0; c < columnCount(); ++c)
		horizontalHeaderItem(c)->setText(QString::number(horizontalHeader()->visualIndex(c)));
}

// the slot doing the renaming
void TableWidget::renameHeaders()
{
	// "convert" logical indexes to visual indexes
	for (int r = 0; r < rowCount(); ++r)
		verticalHeaderItem(r)->setText(QString::number(verticalHeader()->visualIndex(r)));

	for (int c = 0; c < columnCount(); ++c)
		horizontalHeaderItem(c)->setText(QString::number(horizontalHeader()->visualIndex(c)));
}

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[mclark]

Thanks, jpn, this looks like a workable solution for my circumstances.