static void onChange(JSpinner spinner, O r) {
  spinner.addChangeListener(changeListener(r));
}

static <A extends AbstractButton> A onChange(A b, O r) {
  b.addItemListener(itemListener(r));
  ret b;
}

static void onChange(JTextComponent tc, O r) {
  onUpdate(tc, r);
}

static void onChange(final JSlider slider, fO r) {
  swing {
    slider.addChangeListener(changeListener(r));
  }
}