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

    /****************************************************************************
    **
    ** Copyright (C) 2006-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #include <QtGui>

    #include "mysortfilterproxymodel.h"

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

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

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

    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 {
            return QString::localeAwareCompare(leftData.toString(),
                                               rightData.toString()) < 0;
        }
    }

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