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mysortfilterproxymodel.h Example File
itemviews/customsortfiltermodel/mysortfilterproxymodel.h

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 #ifndef MYSORTFILTERPROXYMODEL_H
 #define MYSORTFILTERPROXYMODEL_H

 #include <QDate>
 #include <QSortFilterProxyModel>

 class MySortFilterProxyModel : public QSortFilterProxyModel
 {
     Q_OBJECT

 public:
     MySortFilterProxyModel(QObject *parent = 0);

     QDate filterMinimumDate() const { return minDate; }
     void setFilterMinimumDate(const QDate &date);

     QDate filterMaximumDate() const { return maxDate; }
     void setFilterMaximumDate(const QDate &date);

 protected:
     bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const;
     bool lessThan(const QModelIndex &left, const QModelIndex &right) const;

 private:
     bool dateInRange(const QDate &date) const;

     QDate minDate;
     QDate maxDate;
 };

 #endif