abstract sclass DynBigNumber extends DynModule {

  S description;

  O value;

  int fontSize = 40;

  S toolTip;

  transient JLabel label;

  transient SimpleLiveValue<S> lvText = new(S);

  transient SimpleLiveValue<S> lvDesc = new(S);

  // PUBLIC API

  // any Number, or anything persistable with toString

  bool setValue(O value) {

    bool changed = setField(+value);

    makeTexts();

    ret changed;

  }

  void setDescription(S desc) {

    setField('description, desc);

    makeTexts();

  }

  O getValue() { ret value; }

  S getDescription() { ret description; }

  void setToolTip(S toolTip) { setField(+toolTip); }

  void doPersist() {

    _persistenceInfo = mapMinusOrNull(_persistenceInfo, 'value);

  }

  // END PUBLIC API

  void makeTexts() {

    lvText.set(value == null ? "-" : str(value));

    lvDesc.set(description);

  }

  start {

    _persistenceInfo = mapPlus(_persistenceInfo, value := false);

    makeTexts();

  }

  visualize {

    ret bindToolTipToLiveValue(dm_fieldLiveValue('toolTip),

      jLiveValueSection(lvDesc,

        centerLabel(makeBold(setFontSize(fontSize, label = jLiveValueLabel(lvText))))));

  }

}