Long pressing the JButton to get a JPopupMenu

• download example.jar
• download src.zip
• repository

Code

class PressAndHoldHandler extends AbstractAction implements MouseListener {
  public final JPopupMenu pop = new JPopupMenu();
  public final ButtonGroup bg = new ButtonGroup();
  private AbstractButton arrowButton;
  private final Timer holdTimer = new Timer(1000, e -> {
    if (arrowButton != null && arrowButton.getModel().isPressed()
        && holdTimer.isRunning()) {
      holdTimer.stop();
      pop.show(arrowButton, 0, arrowButton.getHeight());
      pop.requestFocusInWindow();
    }
  });

  public PressAndHoldHandler() {
    super();
    holdTimer.setInitialDelay(1000);
    pop.setLayout(new GridLayout(0, 3, 5, 5));
    for (MenuContext m: makeMenuList()) {
      AbstractButton b = new JRadioButton(m.command);
      b.setActionCommand(m.command);
      b.setForeground(m.color);
      b.setBorder(BorderFactory.createEmptyBorder());
      b.addActionListener(e -> {
        System.out.println(e.getActionCommand());
        pop.setVisible(false);
      });
      pop.add(b);
      bg.add(b);
    }
  }

  private List<MenuContext> makeMenuList() {
    return Arrays.asList(
      new MenuContext("BLACK", Color.BLACK),
      new MenuContext("BLUE", Color.BLUE),
      new MenuContext("CYAN", Color.CYAN),
      new MenuContext("GREEN", Color.GREEN),
      new MenuContext("MAGENTA", Color.MAGENTA),
      new MenuContext("ORANGE", Color.ORANGE),
      new MenuContext("PINK", Color.PINK),
      new MenuContext("RED", Color.RED),
      new MenuContext("YELLOW", Color.YELLOW));
  }

  @Override public void actionPerformed(ActionEvent e) {
    System.out.println("actionPerformed");
    if (holdTimer.isRunning()) {
      ButtonModel model = bg.getSelection();
      if (model != null) {
        System.out.println(model.getActionCommand());
      }
      holdTimer.stop();
    }
  }

  @Override public void mousePressed(MouseEvent e) {
    System.out.println("mousePressed");
    Component c = e.getComponent();
    if (SwingUtilities.isLeftMouseButton(e) && c.isEnabled()) {
      arrowButton = (AbstractButton) c;
      holdTimer.start();
    }
  }

  @Override public void mouseReleased(MouseEvent e) {
    holdTimer.stop();
  }

  @Override public void mouseExited(MouseEvent e) {
    if (holdTimer.isRunning()) {
      holdTimer.stop();
    }
  }

  @Override public void mouseEntered(MouseEvent e) {
    /* not needed */
  }

  @Override public void mouseClicked(MouseEvent e) {
    /* not needed */
  }
}

References

• Long pressing the JButton to get a JPopupMenu(Japanese)

fixed width JButtons in bottom right corner of the JPanel

• download example.jar
• download src.zip
• repository

Code

private static JComponent createRightAlignButtonBox2(
  List<JButton> list, final int buttonWidth, int gap) {
  JComponent box = new JPanel() {
    @Override public void updateUI() {
      for (JButton b : list) {
        b.setPreferredSize(null);
      }
      super.updateUI();
      EventQueue.invokeLater(new Runnable() {
        @Override public void run() {
          int maxHeight = list.stream()
            .map(b -> b.getPreferredSize().height)
            .reduce(0, Integer::max);
          Dimension d = new Dimension(buttonWidth, maxHeight);
          for (JButton b : list) {
            b.setPreferredSize(d);
          }
          revalidate();
        }
      });
    }
  };
  box.setLayout(new BoxLayout(box, BoxLayout.X_AXIS));
  box.add(Box.createHorizontalGlue());
  for (JButton b : list) {
    box.add(b);
    box.add(Box.createHorizontalStrut(gap));
  }
  box.setBorder(BorderFactory.createEmptyBorder(gap, 0, gap, 0));
  return box;
}

References

• fixed width JButtons in bottom right corner of the JPanel(Japanese)

create JTabbedPane like component using CardLayout and JRadioButton(or JTableHeader)

• download example.jar
• download src.zip
• repository

Code

class CardLayoutTabbedPane extends JPanel {
  protected final CardLayout cardLayout = new CardLayout();
  protected final JPanel tabPanel = new JPanel(new GridLayout(1, 0, 0, 0));
  protected final JPanel wrapPanel = new JPanel(new BorderLayout(0, 0));
  protected final JPanel contentsPanel = new JPanel(cardLayout);
  protected final ButtonGroup bg = new ButtonGroup();

  public CardLayoutTabbedPane() {
    super(new BorderLayout());
    int left  = 1;
    int right = 3;
    tabPanel.setBorder(BorderFactory.createEmptyBorder(1, left, 0, right));
    contentsPanel.setBorder(BorderFactory.createEmptyBorder(4, left, 2, right));
    wrapPanel.add(tabPanel);
    wrapPanel.add(new JLabel("test:"), BorderLayout.WEST);
    add(wrapPanel, BorderLayout.NORTH);
    add(contentsPanel);
  }

  public void addTab(final String title, final Component comp) {
    JRadioButton b = new TabButton(new AbstractAction(title) {
      public void actionPerformed(ActionEvent e) {
        cardLayout.show(contentsPanel, title);
      }
    });
    tabPanel.add(b);
    bg.add(b);
    b.setSelected(true);
    contentsPanel.add(comp, title);
    cardLayout.show(contentsPanel, title);
  }
}

References

• create JTabbedPane like component using CardLayout and JRadioButton(or JTableHeader)(Japanese)