Switching between JToolBar and JMenuBar

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

Click on the hamburger menu-like JButton placed on the JToolBar to switch this with the JMenuBar

Code

JMenuBar mainMenuBar = makeMenuBar();
JButton button = makeHamburgerMenuButton(mainMenuBar);
JMenuBar wrappingMenuBar = new JMenuBar();
wrappingMenuBar.add(makeToolBar(button));
EventQueue.invokeLater(() -> getRootPane().setJMenuBar(wrappingMenuBar));

PopupMenuListener handler = new PopupMenuListener() {
  @Override public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
    // not need
  }

  @Override public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
    EventQueue.invokeLater(() -> {
      if (MenuSelectionManager.defaultManager().getSelectedPath().length == 0) {
        getRootPane().setJMenuBar(wrappingMenuBar);
      }
    });
  }

  @Override public void popupMenuCanceled(PopupMenuEvent e) {
    EventQueue.invokeLater(() -> getRootPane().setJMenuBar(wrappingMenuBar));
  }
};
for (int i = 0; i < mainMenuBar.getMenuCount(); i++) {
  mainMenuBar.getMenu(i).getPopupMenu().addPopupMenuListener(handler);
}
// ...
private JButton makeHamburgerMenuButton(JMenuBar menuBar) {
  JButton button = new JButton("Ξ") {
    @Override public Dimension getPreferredSize() {
      Dimension d = super.getPreferredSize();
      d.height = menuBar.getMenu(0).getPreferredSize().height;
      return d;
    }

    @Override public void updateUI() {
      super.updateUI();
      setContentAreaFilled(false);
      setFocusPainted(false);
      setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 2));
    }
  };
  button.addActionListener(e -> {
    getRootPane().setJMenuBar(menuBar);
    getRootPane().revalidate();
    EventQueue.invokeLater(() -> menuBar.getMenu(0).doClick());
  });
  button.setMnemonic('\\');
  button.setToolTipText("Main Menu(Alt+\\)");
  return button;
}

References

• Show the main menu as a toolbar (Windows and Linux) | Menus and toolbars | IntelliJ IDEA Documentation
• Switching between JToolBar and JMenuBar(Japanese)

JMenuBar Background Image

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

Code

public JMenuBar createMenubar() {
  final TexturePaint texture = makeTexturePaint();
  JMenuBar mb = new JMenuBar() {
    @Override protected void paintComponent(Graphics g) {
      super.paintComponent(g);
      Graphics2D g2 = (Graphics2D) g.create();
      g2.setPaint(texture);
      g2.fillRect(0, 0, getWidth(), getHeight());
      g2.dispose();
    }
  };
  mb.setOpaque(false);
  String[] menuKeys = {"File", "Edit", "Help"};
  for (String key: menuKeys) {
    JMenu m = createMenu(key);
    if (m != null) {
      mb.add(m);
    }
  }
  return mb;
}

private JMenu createMenu(String key) {
  JMenu menu = new JMenu(key) {
    @Override protected void fireStateChanged() {
      ButtonModel m = getModel();
      if (m.isPressed() && m.isArmed()) {
        setOpaque(true);
      } else if (m.isSelected()) {
        setOpaque(true);
      } else if (isRolloverEnabled() && m.isRollover()) {
        setOpaque(true);
      } else {
        setOpaque(false);
      }
      super.fireStateChanged();
    };
  };
  if ("Windows XP".equals(System.getProperty("os.name"))) {
    menu.setBackground(new Color(0x0, true)); // XXX: Windows XP lnf?
  }
  menu.add("JMenuItem1");
  menu.add("JMenuItem2");
  menu.add("JMenuItem3");
  return menu;
}

References

• JMenuBar Background Image(Japanese)