static <A extends JSpinner> A onChange(A spinner, O r) {
  ret onChange(spinner, toRunnable(r));
}

static <A extends JSpinner> A onChange(A spinner, Runnable r) {
  if (r != null)
    swing { spinner.addChangeListener(changeListener(r)); }
  ret spinner;
}

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

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

static <A extends JSlider> A onChange(A slider, fO r) {
  swing { slider.addChangeListener(changeListener(r)); }
  ret slider;
}

static <A> JComboBox<A> onChange(JComboBox<A> cb, IVF1<A> f) {
  if (f != null) addActionListener(cb, -> f.get(getSelectedItem_typed(cb)));
  ret cb;
}

static JComboBox onChange(O r, JComboBox cb) {
  ret onChange(cb, r);
}

static JComboBox onChange(JComboBox cb, fO r) {
  if (isEditableComboBox(cb))
    onChange(textFieldFromComboBox(cb), r);
  else
    onSelectedItem(cb, voidfunc(S s) { callF(r) });
  ret cb;
}