abstract sclass DynBigNumber extends DynModule {
  S description;
  O value;
  int fontSize = 40;
  
  transient SimpleLiveValue<S> lvText = new(S);
  transient SimpleLiveValue<S> lvDesc = new(S);
  
  // PUBLIC API
  
  // any Number, or anything persistable with toString
  void setValue(O value) {
    setField(+value);
    makeTexts();
  }
  
  void setDescription(S desc) {
    setField('description, desc);
    makeTexts();
  }
  
  O getValue() { ret value; }
  S getDescription() { ret description; }
  
  // END PUBLIC API
  
  void makeTexts() {
    lvText.set(value == null ? "-" : str(value));
    lvDesc.set(description);
  }
  
  void start { persistOnChangedField = false; makeTexts(); }

  JComponent visualize() {
    ret jLiveValueSection(lvDesc, centerLabel(makeBold(setFontSize(fontSize, jLiveValueLabel(lvText)))));
  }
}