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Всем доброго. Не заметил, что уже ранее на форуме выкладывали решение, и сделал своё. Вроде, получилось немного попроще, судить вам.

newsortfilterproxymodel.h

C++ (Qt)
#ifndef NEWSORTFILTERPROXYMODEL_H
#define NEWSORTFILTERPROXYMODEL_H
 
#include <QtGui/QSortFilterProxyModel>
 
class NewSortFilterProxyModel : public QSortFilterProxyModel
{
	Q_OBJECT
 
private:
	QList<QPair<int, Qt::SortOrder> > m_sortedColumns;
	Qt::SortOrder m_sortOrder;
 
public:
	NewSortFilterProxyModel(QObject *parent = 0);
	virtual ~NewSortFilterProxyModel()
	{}
 
	QVariant headerData ( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const;
 
	QList<QPair<int, Qt::SortOrder> > sortedColumns()
	{return m_sortedColumns;}
	void setSortedColumns(QList<QPair<int, Qt::SortOrder> > sortedColumns)
	{
		m_sortedColumns = sortedColumns;
		sort();
	}
 
	void addSortedColumn(int column, Qt::SortOrder order);
	void removeSortedColumn(int column);
	void changeSortedColumn(int column, Qt::SortOrder order);
 
	Qt::SortOrder sortOrder() const
	{return m_sortOrder;}
	Qt::SortOrder sortOrder(int column) const;
 
	bool isColumnInSort(int column) const;
 
protected:
	void sort();
	bool lessThan ( const QModelIndex & left, const QModelIndex & right ) const;
 
public Q_SLOTS:
	void clearSort();
};
 
#endif //NEWSORTFILTERPROXYMODEL_H
 

newsortfilterproxymodel.cpp

C++ (Qt)
#include <QtCore/QVariant>
 
#include "newsortfilterproxymodel.h"
 
NewSortFilterProxyModel::NewSortFilterProxyModel(QObject *parent)
	:QSortFilterProxyModel(parent), m_sortOrder(Qt::AscendingOrder)
{
 
}
 
QVariant NewSortFilterProxyModel::headerData ( int section, Qt::Orientation orientation, int role) const
{
	if(role == Qt::DisplayRole) {
		if(orientation == Qt::Horizontal) {
			for (int i = 0; i < m_sortedColumns.size(); i++) {
				if (m_sortedColumns.at(i).first == section) {
					QString sortIndicator = m_sortedColumns.at(i).second == Qt::AscendingOrder ? QString(0x2193) : QString(0x2191);
					if (i > 0)
						sortIndicator += QString::number(i + 1);
					return sortIndicator + " " + sourceModel()->headerData(section, orientation, role).toString();
				}
			}
		}
	}
	return sourceModel()->headerData(section, orientation, role);
}
 
void NewSortFilterProxyModel::addSortedColumn(int column, Qt::SortOrder order)
{
	m_sortOrder = order;
	QPair<int, Qt::SortOrder> pair;
	pair.first = column;
	pair.second = order;
	m_sortedColumns << pair;
	sort();
}
 
void NewSortFilterProxyModel::removeSortedColumn(int column)
{
	for (int i = 0; i < m_sortedColumns.size(); i++) {
		if (m_sortedColumns.at(i).first == column) {
			m_sortedColumns.removeAt(i);
			sort();
			break;
		}
	}
}
 
void NewSortFilterProxyModel::changeSortedColumn(int column, Qt::SortOrder order)
{
	for (int i = 0; i < m_sortedColumns.size(); i++) {
		if (m_sortedColumns.at(i).first == column) {
			m_sortOrder = order;
			m_sortedColumns[i].second = order;
			sort();
			break;
		}
	}
}
 
void NewSortFilterProxyModel::clearSort()
{
	m_sortedColumns.clear();
	reset();
	sort();
}
 
void NewSortFilterProxyModel::sort()
{
	int column = m_sortedColumns.isEmpty() ? -1 : 0;
	QSortFilterProxyModel::sort(column, Qt::AscendingOrder);
}
 
bool NewSortFilterProxyModel::lessThan ( const QModelIndex & left, const QModelIndex & right ) const
{
	for (int i = 0; i < m_sortedColumns.size(); i++) {
		QVariant leftData = sourceModel()->index(left.row(), m_sortedColumns.at(i).first).data(Qt::DisplayRole);
		QVariant rightData = sourceModel()->index(right.row(), m_sortedColumns.at(i).first).data(Qt::DisplayRole);
		Qt::SortOrder order = m_sortedColumns.at(i).second;
 
		if (leftData == rightData)
			continue;
 
		switch (leftData.type()) {
			case QVariant::Int:
				return (leftData.toInt() < rightData.toInt()) ^ order;
				break;
			case QVariant::UInt:
				return (leftData.toUInt() < rightData.toUInt()) ^ order;
				break;
			case QVariant::LongLong:
				return (leftData.toLongLong() < rightData.toLongLong()) ^ order;
				break;
			case QVariant::ULongLong:
				return (leftData.toULongLong() < rightData.toULongLong()) ^ order;
				break;
			case QVariant::Double:
				return (leftData.toDouble() < rightData.toDouble()) ^ order;
				break;
			case QVariant::Char:
				return (leftData.toChar() < rightData.toChar()) ^ order;
				break;
			case QVariant::Date:
				return (leftData.toDate() < rightData.toDate()) ^ order;
				break;
			case QVariant::Time:
				return (leftData.toTime() < rightData.toTime()) ^ order;
				break;
			case QVariant::DateTime:
				return (leftData.toDateTime() < rightData.toDateTime()) ^ order;
				break;
			case QVariant::String: default:
				return (QString::localeAwareCompare(leftData.toString(), rightData.toString()) < 0) ^ order;
				break;
		}
	}
	return false;
}
 
Qt::SortOrder NewSortFilterProxyModel::sortOrder(int column) const
{
	for (int i = 0; i < m_sortedColumns.size(); i++) {
		if (m_sortedColumns.at(i).first == column) {
			return m_sortedColumns.at(i).second;
		}
	}
}
 
bool NewSortFilterProxyModel::isColumnInSort(int column) const
{
	for (int i = 0; i < m_sortedColumns.size(); i++) {
		if (m_sortedColumns.at(i).first == column) {
			return true;
		}
	}
	return false;
}
 

Пример использования:

C++ (Qt)
....................................................
 model = new NewSortFilterProxyModel(this);
 model->setSourceModel (sourceModel);
 view = new QTableView(this);
 view->setModel(model);
 connect(view->horizontalHeader(), SIGNAL(sectionClicked(int)), this, SLOT(sort(int)));
....................................................
void DBFRedactorMainWindow::sort(int section)
{
	Qt::SortOrder order = model->sortOrder();
	if (model->sortColumn() == section)
		order = model->sortOrder() == Qt::AscendingOrder
				? Qt::DescendingOrder
				: Qt::AscendingOrder;
 
	if (qApp->keyboardModifiers() & Qt::CTRL) {
		if (model->isColumnInSort(section)) {
			Qt::SortOrder order = model->sortOrder(section) == Qt::AscendingOrder
								  ? Qt::DescendingOrder
								  : Qt::AscendingOrder;
			model()->changeSortedColumn(section, order);
		} else {
			model()->addSortedColumn(section, model->sortOrder());
		}
	} else {
		Qt::SortOrder order = model->sortOrder();
		if (model->isColumnInSort(section)) {
			order = model()->sortOrder(section) == Qt::AscendingOrder
					? Qt::DescendingOrder
					 : Qt::AscendingOrder;
		}
		model->clearSort();
		model->addSortedColumn(section, order);
	}
}
 

Спасибо за хорошую работу.