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MainPanel.java
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MainPanel.java
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// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import java.util.Collections;
import java.util.Optional;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
JRadioButton r1 = new JRadioButton("Default: ASCENDING<->DESCENDING", false);
JRadioButton r2 = new JRadioButton("ASCENDING->DESCENDING->UNSORTED", true);
ButtonGroup bg = new ButtonGroup();
bg.add(r1);
bg.add(r2);
JPanel p = new JPanel(new GridLayout(2, 1));
p.add(r1);
p.add(r2);
TableModel model = makeModel();
TableRowSorter<TableModel> sorter = makeSorter(model, r2);
JTable table = new JTable(model);
table.setRowSorter(sorter);
// sorter.setSortKeys(Arrays.asList(new RowSorter.SortKey(1, SortOrder.DESCENDING)));
// sorter.toggleSortOrder(1);
add(p, BorderLayout.NORTH);
add(new JScrollPane(table));
setPreferredSize(new Dimension(320, 240));
}
private static TableModel makeModel() {
String[] columnNames = {"String", "Integer", "Boolean"};
Object[][] data = {
{"aaa", 12, true}, {"bbb", 5, false}, {"CCC", 92, true}, {"DDD", 0, false}
};
return new DefaultTableModel(data, columnNames) {
@Override public Class<?> getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
}
private static TableRowSorter<TableModel> makeSorter(TableModel m, AbstractButton b) {
return new TableRowSorter<TableModel>(m) {
@Override public void toggleSortOrder(int column) {
if (b.isSelected() && isSortable(column) && isDescending(column)) {
setSortKeys(Collections.emptyList());
// or: setSortKeys(null);
} else {
super.toggleSortOrder(column);
}
}
private boolean isDescending(int column) {
return Optional.of(getSortKeys())
.filter(keys -> !keys.isEmpty())
.map(keys -> keys.get(0))
.map(k -> k.getColumn() == column && k.getSortOrder() == SortOrder.DESCENDING)
.orElse(false);
}
};
}
public static void main(String[] args) {
EventQueue.invokeLater(MainPanel::createAndShowGui);
}
private static void createAndShowGui() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
ex.printStackTrace();
return;
}
JFrame frame = new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}