static AutoCloseable tempOnKeyTyped(final int keyCode, final Runnable r, final JComponent a) {
  if (a == null) null;
  final KeyAdapter listener = new {
    public void keyTyped(KeyEvent e) {
      if (e.getKeyCode() == keyCode && e.getModifiers() == 0)
        pcallF(r);
    }
  };
  swing { a.addKeyListener(listener); }
  ret autoCloseable { swing { a.removeKeyListener(listener); } };
}