sclass TrayIconLastPosition {
  TrayIcon trayIcon;
  WithTimestamp<Pt> lastPosition;
  
  *(TrayIcon *trayIcon) {
    trayIcon?.addMouseMotionListener(new MouseMotionAdapter {
      @Override
      public void mouseMoved(MouseEvent e) {
        lastPosition = withTimestamp(pt(e.getX(), e.getY()));
      }
    });
  }
}