!7

abstract sclass DynPrintLogAndButtons > DynPrintLog {
  transient SingleComponentPanel buttons;

  visualize {
    ret centerAndSouth(super.visualize(), buttons = singleComponentPanel());
  }
  
  void unvisualize {
    zeroAllFieldsOfTypeExcept(this, Component, 'buttons);
  }

  start {
    // keep this permanently to allow setting buttons in hidden module
    buttons = singleComponentPanel();
  }
  
  void hideButtons {
    buttons.setComponent(null);
  }
  
  void showButtons(O... params) {
    buttons.setComponent(withMargin(centeredButtonsOrSingleComponent(params)));
  }
}