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 #include <QtGui>

 #include "mysortfilterproxymodel.h"

 //! [0]

 MySortFilterProxyModel::MySortFilterProxyModel(QObject *parent)

     : QSortFilterProxyModel(parent)

 {

 }

 //! [0]

 //! [1]

 void MySortFilterProxyModel::setFilterMinimumDate(const QDate &date)

 {

     minDate = date;

     invalidateFilter();

 }

 //! [1]

 //! [2]

 void MySortFilterProxyModel::setFilterMaximumDate(const QDate &date)

 {

     maxDate = date;

     invalidateFilter();

 }

 //! [2]

 //! [3]

 bool MySortFilterProxyModel::filterAcceptsRow(int sourceRow,

         const QModelIndex &sourceParent) const

 {

     QModelIndex index0 = sourceModel()->index(sourceRow, 0, sourceParent);

     QModelIndex index1 = sourceModel()->index(sourceRow, 1, sourceParent);

     QModelIndex index2 = sourceModel()->index(sourceRow, 2, sourceParent);

     return (sourceModel()->data(index0).toString().contains(filterRegExp())

             || sourceModel()->data(index1).toString().contains(filterRegExp()))

            && dateInRange(sourceModel()->data(index2).toDate());

 }

 //! [3]

 //! [4] //! [5]

 bool MySortFilterProxyModel::lessThan(const QModelIndex &left,

                                       const QModelIndex &right) const

 {

     QVariant leftData = sourceModel()->data(left);

     QVariant rightData = sourceModel()->data(right);

 //! [4]

 //! [6]

     if (leftData.type() == QVariant::DateTime) {

         return leftData.toDateTime() < rightData.toDateTime();

     } else {

         QRegExp *emailPattern = new QRegExp("([\\w\\.]*@[\\w\\.]*)");

         QString leftString = leftData.toString();

         if(left.column() == 1 && emailPattern->indexIn(leftString) != -1)

             leftString = emailPattern->cap(1);

         QString rightString = rightData.toString();

         if(right.column() == 1 && emailPattern->indexIn(rightString) != -1)

             rightString = emailPattern->cap(1);

         return QString::localeAwareCompare(leftString, rightString) < 0;

     }

 }

 //! [5] //! [6]

 //! [7]

 bool MySortFilterProxyModel::dateInRange(const QDate &date) const

 {

     return (!minDate.isValid() || date > minDate)

            && (!maxDate.isValid() || date < maxDate);

 }

 //! [7]