svoid onSelectionChanged(JList list, VF1<S> f) {
  onSelectionChanged(list, toIVF1(f));
}

svoid onSelectionChanged(JList list, IVF1<S> f) {
  if (list != null && f != null) swing {
    list.addListSelectionListener(new ListSelectionListener {
      public void valueChanged(ListSelectionEvent e) {
        pcallF(f, getSelectedItem(list));
      }
    });
  }
}