Swing/SingleAndDoubleClicksOnTrayIcon のバックアップ(No.1)

JDialog tmp = new JDialog();
tmp.setUndecorated(true);
tmp.setAlwaysOnTop(true);
Point loc = new Point();
Image image = makeDefaultTrayImage();
TrayIcon icon = new TrayIcon(image, "TRAY", null);
icon.addMouseListener(new TrayIconPopupMenuHandler(popup, tmp));
icon.addMouseListener(new MouseAdapter() {
  private final Timer timer = new Timer(500, e -> {
    ((Timer) e.getSource()).stop();
    openLookAndFeelBox(lnf, tmp, loc);
  });

  @Override public void mousePressed(MouseEvent e) {
    loc.setLocation(e.getPoint());
    if (SwingUtilities.isLeftMouseButton(e)) {
      timer.setDelay(500);
      timer.setRepeats(false);
      timer.start();
    }
  }

  @Override public void mouseClicked(MouseEvent e) {
    boolean isDoubleClick = e.getClickCount() >= 2;
    if (SwingUtilities.isLeftMouseButton(e) && isDoubleClick) {
      timer.stop();
      lnf.setVisible(false);
      frame.setVisible(true);
    }
  }
});
try {
  SystemTray.getSystemTray().add(icon);
} catch (AWTException ex) {
  throw new IllegalStateException(ex);
}