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# mysortfilterproxymodel.cpp Example File
itemviews/customsortfiltermodel/mysortfilterproxymodel.cpp

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     #include <QtGui>

     #include "mysortfilterproxymodel.h"

     MySortFilterProxyModel::MySortFilterProxyModel(QObject *parent)
         : QSortFilterProxyModel(parent)
     {
     }

     void MySortFilterProxyModel::setFilterMinimumDate(const QDate &date)
     {
         minDate = date;
         invalidateFilter();
     }

     void MySortFilterProxyModel::setFilterMaximumDate(const QDate &date)
     {
         maxDate = date;
         invalidateFilter();
     }

     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());
     }

     bool MySortFilterProxyModel::lessThan(const QModelIndex &left,
                                           const QModelIndex &right) const
     {
         QVariant leftData = sourceModel()->data(left);
         QVariant rightData = sourceModel()->data(right);

         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;
         }
     }

     bool MySortFilterProxyModel::dateInRange(const QDate &date) const
     {
         return (!minDate.isValid() || date > minDate)
                && (!maxDate.isValid() || date < maxDate);
     }