mysortfilterproxymodel.cpp Example File

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 #include <QtWidgets>

 #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 {
         static const QRegularExpression emailPattern("[\\w\\.]*@[\\w\\.]*");

         QString leftString = leftData.toString();
         if (left.column() == 1) {
             const QRegularExpressionMatch match = emailPattern.match(leftString);
             if (match.hasMatch())
                 leftString = match.captured(0);
         }
         QString rightString = rightData.toString();
         if (right.column() == 1) {
             const QRegularExpressionMatch match = emailPattern.match(rightString);
             if (match.hasMatch())
                 rightString = match.captured(0);
         }

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

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