qtablewidget.cpp
*
void QTableWidgetPrivate::setup()
{
    Q_Q(QTableWidget);
    // view signals
...
    QObject::connect(q, SIGNAL(doubleClicked(QModelIndex)),
                     q, SLOT(_q_emitItemDoubleClicked(QModelIndex)));
...
}

void QTableWidgetPrivate::_q_emitItemDoubleClicked(const QModelIndex &index)
{
    Q_Q(QTableWidget);
    if (QTableWidgetItem *item = model()->item(index))
        emit q->itemDoubleClicked(item);
    emit q->cellDoubleClicked(index.row(), index.column());
}

...
//Для возможности сортировки
class CMyTableWidgetItem1 : public QTableWidgetItem
{
	bool operator<(const QTableWidgetItem &other) const;
};
...

...
CMyTableWidgetItem1 *p_file_name = NULL;
p_file_name = (CMyTableWidgetItem1*)new QTableWidgetItem(QString("тут имя файла"));
p_file_name->setFlags(Qt::ItemIsSelectable);
if(p_file_name)
    p_tbl->setItem(n_row, 0, p_file_name);
...

for(int i=0; i < n_row_count; i++)
{
		CMyTableWidgetItem1*p_file_name = NULL;
		CMyTableWidgetItem1*p_card_number = NULL;
		CMyTableWidgetItem1*p_lat_number = NULL;
		CMyTableWidgetItem1*p_kind_crime = NULL;
		CMyTableWidgetItem1*p_priority = NULL;
		CMyTableWidgetItem1*p_time = NULL;
		CMyTableWidgetItem1*p_type = NULL;
//имя файла без пути и расширения
		try
		{
			p_file_name = (CMyTableWidgetItem1*)new QTableWidgetItem(QString(local_list.at(i).fileName()));
			p_file_name->setFlags(Qt::ItemIsSelectable);
			if(p_file_name)
				p_tbl->setItem(n_row, 0, p_file_name);
// и дальше создание остальных n-айтемов с другими данными текущей строки таблицы
...
		}
		catch(...)
		{
			err_mem();
			reject();
		}
}

QTableWidgetItem1 *p_file_name = NULL;
p_file_name = new QTableWidgetItem(QString(...));

CMyTableWidgetItem1 *p_file_name = NULL;
p_file_name = new CMyTableWidgetItem1(QString(...));

p_card_number = new CMyTableWidgetItem1();
p_tbl->setItem(n_row, 1, p_card_number);
...
p_card_number->setText(QString(str_val));

CMyTableWidgetItem1 *p_file_name = NULL;
p_file_name = new CMyTableWidgetItem1();
p_file_name->setText(QString(local_list.at(i).fileName()));
p_tbl->setItem(n_row, 0, p_file_name);

bool CMyTableWidgetItem1::operator<(const QTableWidgetItem &other) const
{
    const QVariant l = data(Qt::DisplayRole), r = other.data(Qt::DisplayRole);
	 switch(l.type())
	{
		case QVariant::Invalid:
		  return (r.type() == QVariant::Invalid);
		case QVariant::Int:
		  return l.toInt() < r.toInt();
		case QVariant::UInt:
		  return l.toUInt() < r.toUInt();
		case QVariant::LongLong:
		  return l.toLongLong() < r.toLongLong();
		case QVariant::ULongLong:
		  return l.toULongLong() < r.toULongLong();
		case QVariant::Double:
		  return l.toDouble() < r.toDouble();
		case QVariant::Char:
		  return l.toChar() < r.toChar();
		case QVariant::Date:
		  return l.toDate() < r.toDate();
		case QVariant::Time:
		  return l.toTime() < r.toTime();
		case QVariant::DateTime:
		  return l.toDateTime() < r.toDateTime();
		case QVariant::String:
		default:
		  return l.toString().compare(r.toString(), Qt::CaseSensitive) < 0;
	}
	 return l.toString() < r.toString();
}

p_file_name->setFlags(Qt::ItemIsSelectable);

bool QTableWidgetItem::operator<(const QTableWidgetItem &other) const
{
    const QVariant v1 = data(Qt::DisplayRole), v2 = other.data(Qt::DisplayRole);
    if (QTableModel::canConvertToDouble(v1) && QTableModel::canConvertToDouble(v2))
        return v1.toDouble() < v2.toDouble();
    return v1.toString() < v2.toString();
}