sclass InputChooser implements Swingable {
  DynModule module;
  transient S input;
  transient OptionalInputPanel panel;
  
  *(DynModule *module) {}
  
  S input() { ret input; }
  S _freshInput() { ret dm_getInterestingString(); }
  
  bool update() {
    S s = _freshInput();
    if (neq(input, s)) {
      input = s;
      true; //dm_updateModule();
    }
    false;
  }
  
  JComponent visualize() {
    ret wrap(panel != null ? panel
      : (panel = new OptionalInputPanel));
  }
}