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

static void onChange(AbstractButton b, O r) {
  b.addChangeListener(changeListener(r));
}

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

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