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# Code for Custom Sort/Filter Model Example

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    package com.trolltech.examples;

    import com.trolltech.qt.core.*;
    import com.trolltech.qt.gui.*;

    @QtJambiExample(name = "Custom Filter")
    public class CustomFilter extends QWidget {

        public static void main(String[] args) {

            QApplication.initialize(args);
            CustomFilter filter = new CustomFilter();
            filter.show();
            QApplication.exec();
        }

        private MySortFilterProxyModel proxyModel;

        QGroupBox sourceGroupBox;
        QGroupBox proxyGroupBox;
        QTreeView sourceView;
        QTreeView proxyView;
        QCheckBox filterCaseSensitivityCheckBox;
        QLabel filterPatternLabel;
        QLabel fromLabel;
        QLabel toLabel;
        QLineEdit filterPatternLineEdit;
        QComboBox filterSyntaxComboBox;
        QDateEdit fromDateEdit;
        QDateEdit toDateEdit;

        public CustomFilter() {
            QStandardItemModel model = createMailModel(this);

            proxyModel = new MySortFilterProxyModel(this);
            proxyModel.setSourceModel(model);
            proxyModel.setDynamicSortFilter(true);

            sourceView = new QTreeView();
            sourceView.setRootIsDecorated(false);
            sourceView.setAlternatingRowColors(true);
            sourceView.setModel(model);

            QHBoxLayout sourceLayout = new QHBoxLayout();
            sourceLayout.addWidget(sourceView);

            sourceGroupBox = new QGroupBox(tr("Original Model"));
            sourceGroupBox.setLayout(sourceLayout);

            filterPatternLineEdit = new QLineEdit("Grace|Sports");
            filterPatternLabel = new QLabel(tr("&Filter pattern:"));
            filterPatternLabel.setBuddy(filterPatternLineEdit);

            filterSyntaxComboBox = new QComboBox();
            filterSyntaxComboBox.addItem(tr("Regular expression"),
                                         QRegExp.PatternSyntax.RegExp);
            filterSyntaxComboBox.addItem(tr("Wildcard"),
                                         QRegExp.PatternSyntax.Wildcard);
            filterSyntaxComboBox.addItem(tr("Fixed string"),
                                         QRegExp.PatternSyntax.FixedString);

            filterCaseSensitivityCheckBox = new QCheckBox(
                    tr("Case sensitive filter"));
            filterCaseSensitivityCheckBox.setChecked(true);

            fromDateEdit = new QDateEdit(new QDate(1970, 01, 01));
            fromLabel = new QLabel(tr("F&rom:"));
            fromLabel.setBuddy(fromDateEdit);

            toDateEdit = new QDateEdit(new QDate(2099, 12, 31));
            toLabel = new QLabel(tr("&To:"));
            toLabel.setBuddy(toDateEdit);

            filterPatternLineEdit.textChanged.connect(this, "textFilterChanged()");
            filterSyntaxComboBox.currentIndexChanged.connect(this,
                                                             "textFilterChanged()");
            filterCaseSensitivityCheckBox.toggled.connect(this,
                                                          "textFilterChanged()");
            fromDateEdit.dateChanged.connect(this, "dateFilterChanged()");
            toDateEdit.dateChanged.connect(this, "dateFilterChanged()");

            proxyView = new QTreeView();
            proxyView.setRootIsDecorated(false);
            proxyView.setAlternatingRowColors(true);
            proxyView.setModel(proxyModel);
            proxyView.setSortingEnabled(true);
            proxyView.sortByColumn(1, Qt.SortOrder.AscendingOrder);

            QGridLayout proxyLayout = new QGridLayout();
            proxyLayout.addWidget(proxyView, 0, 0, 1, 3);
            proxyLayout.addWidget(filterPatternLabel, 1, 0);
            proxyLayout.addWidget(filterPatternLineEdit, 1, 1);
            proxyLayout.addWidget(filterSyntaxComboBox, 1, 2);
            proxyLayout.addWidget(filterCaseSensitivityCheckBox, 2, 0, 1, 3);
            proxyLayout.addWidget(fromLabel, 3, 0);
            proxyLayout.addWidget(fromDateEdit, 3, 1, 1, 2);
            proxyLayout.addWidget(toLabel, 4, 0);
            proxyLayout.addWidget(toDateEdit, 4, 1, 1, 2);

            proxyGroupBox = new QGroupBox(tr("Sorted/Filtered Model"));
            proxyGroupBox.setLayout(proxyLayout);

            QVBoxLayout mainLayout = new QVBoxLayout();
            mainLayout.addWidget(sourceGroupBox);
            mainLayout.addWidget(proxyGroupBox);
            setLayout(mainLayout);

            setWindowTitle(tr("Custom Sort/Filter Model"));
            setWindowIcon(new QIcon("classpath:com/trolltech/images/qt-logo.png"));
            resize(500, 450);

            textFilterChanged();
            dateFilterChanged();
        }

        private void addMail(QAbstractItemModel model, String subject,
                             String sender, QDateTime date) {
            model.insertRow(0);
            model.setData(model.index(0, 0), subject);
            model.setData(model.index(0, 1), sender);
            model.setData(model.index(0, 2), date);
        }

        private QStandardItemModel createMailModel(QObject parent) {
            QStandardItemModel model = new QStandardItemModel(0, 3, parent);

            model.setHeaderData(0, Qt.Orientation.Horizontal, tr("Subject"));
            model.setHeaderData(1, Qt.Orientation.Horizontal, tr("Sender"));
            model.setHeaderData(2, Qt.Orientation.Horizontal, tr("Date"));

            addMail(model, "Happy New Year!", "Grace K. <grace@software-inc.com>",
                    new QDateTime(new QDate(2006, 12, 31), new QTime(17, 03)));
            addMail(model, "Radically new concept",
                    "Grace K. <grace@software-inc.com>",
                    new QDateTime(new QDate(2006, 12, 22), new QTime(9, 44)));
            addMail(model, "Accounts", "pascale@nospam.com",
                    new QDateTime(new QDate(2006, 12, 31), new QTime(12, 50)));
            addMail(model, "Expenses", "Joe Bloggs <joe@bloggs.com>",
                    new QDateTime(new QDate(2006, 12, 25), new QTime(11, 39)));
            addMail(model, "Re: Expenses", "Andy <andy@nospam.com>",
                    new QDateTime(new QDate(2007, 01, 02), new QTime(16, 05)));
            addMail(model, "Re: Accounts", "Joe Bloggs <joe@bloggs.com>",
                    new QDateTime(new QDate(2007, 01, 03), new QTime(14, 18)));
            addMail(model, "Re: Accounts", "Andy <andy@nospam.com>",
                    new QDateTime(new QDate(2007, 01, 03), new QTime(14, 26)));
            addMail(model, "Sports", "Linda Smith <linda.smith@nospam.com>",
                    new QDateTime(new QDate(2007, 01, 05), new QTime(11, 33)));
            addMail(model, "AW: Sports", "Rolf Newschweinstein <rolfn@nospam.com>",
                    new QDateTime(new QDate(2007, 01, 05), new QTime(12, 00)));
            addMail(model, "RE: Sports", "Petra Schmidt <petras@nospam.com>",
                    new QDateTime(new QDate(2007, 01, 05), new QTime(12, 01)));

            return model;
        }

        private void textFilterChanged() {
            QRegExp.PatternSyntax syntax;
            int index = filterSyntaxComboBox.currentIndex();
            syntax = (QRegExp.PatternSyntax) filterSyntaxComboBox.itemData(index);

            Qt.CaseSensitivity caseSensitivity;
            if (filterCaseSensitivityCheckBox.isChecked())
                caseSensitivity = Qt.CaseSensitivity.CaseSensitive;
            else
                caseSensitivity = Qt.CaseSensitivity.CaseInsensitive;

            QRegExp regExp = new QRegExp(filterPatternLineEdit.text(),
                                         caseSensitivity, syntax);
            proxyModel.setFilterRegExp(regExp);
        }

        private void dateFilterChanged() {
            proxyModel.setFilterMinimumDate(fromDateEdit.date());
            proxyModel.setFilterMaximumDate(toDateEdit.date());
        }

        private class MySortFilterProxyModel extends QSortFilterProxyModel {
            private QDateTime minDate = new QDateTime();
            private QDateTime maxDate = new QDateTime();

            private MySortFilterProxyModel(QObject parent) {
                super(parent);
            }

            private void setFilterMinimumDate(QDate date) {
                minDate = new QDateTime(date);
                invalidateFilter();
            }

            private void setFilterMaximumDate(QDate date) {
                maxDate = new QDateTime(date);
                invalidateFilter();
            }

            @Override
            protected boolean filterAcceptsRow(int sourceRow,
                                               QModelIndex sourceParent) {
                QModelIndex index0;
                QModelIndex index1;
                QModelIndex index2;

                index0 = sourceModel().index(sourceRow, 0, sourceParent);
                index1 = sourceModel().index(sourceRow, 1, sourceParent);
                index2 = sourceModel().index(sourceRow, 2, sourceParent);

                QRegExp filter = filterRegExp();
                QAbstractItemModel model = sourceModel();
                boolean matchFound;

                matchFound = filter.indexIn(model.data(index0).toString()) != -1
                             || filter.indexIn(model.data(index1).toString()) != -1;

                return matchFound && dateInRange((QDateTime) (model.data(index2)));
            }

            @Override
            protected boolean lessThan(QModelIndex left, QModelIndex right) {

                boolean result = false;
                Object leftData = sourceModel().data(left);
                Object rightData = sourceModel().data(right);

                if (leftData instanceof QDateTime
                    && rightData instanceof QDateTime) {

                    QDateTime leftDate = (QDateTime) leftData;
                    QDateTime rightDate = (QDateTime) rightData;

                    result = leftDate.compareTo(rightDate) < 0;
                } else {

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

                    String leftString = leftData.toString();
                    if(left.column() == 1 && emailPattern.indexIn(leftString) != -1)
                        leftString = emailPattern.cap(1);

                    String rightString = rightData.toString();
                    if(right.column() == 1 && emailPattern.indexIn(rightString) != -1)
                        rightString = emailPattern.cap(1);

                    result = leftString.compareTo(rightString) < 0;
                }
                return result;
            }

            private boolean dateInRange(QDateTime date) {
                return (minDate.compareTo(date) < 0 && maxDate.compareTo(date) > 0);
            }
        }
    }