static <A extends JComponent> onKeyTyped(int keyCode, Runnable r, A a) {
  if (a != null) swing {
    a.addKeyListener(new KeyAdapter {
      public void keyTyped(KeyEvent e) {
        if (e.getKeyCode() == keyCode && e.getModifiers() == 0)
          pcallF(r);
      }
    });
  });
  ret a;
}