static AutoCloseable tempOnKeyPressed(final int keyCode, final Runnable r, final JComponent a) {
  if (a == null) null;
  final KeyAdapter listener = new {
    @Override
    public void keyPressed(KeyEvent e) {
      ifdef tempOnKeyPressed_debug
        print("key code: " + e.getKeyCode());
      endifdef
      if (simplifyKeyCode(e.getKeyCode()) == keyCode && e.getModifiers() == 0)
        pcallF(r);
    }
  };
  swing { a.addKeyListener(listener); }
  ifdef tempOnKeyPressed_debug
    print("key listener installed");
  endifdef
  ret autoCloseable {
    swing { a.removeKeyListener(listener); }
    ifdef tempOnKeyPressed_debug
      print("key listener removed");
    endifdef
  };
}