  return &#39;SemanticsAction.scrollRight&#39;;
    case _kScrollUpIndex:
      return &#39;SemanticsAction.scrollUp&#39;;
    case _kScrollDownIndex:
      return &#39;SemanticsAction.scrollDown&#39;;
    case _kIncreaseIndex:
      return &#39;SemanticsAction.increase&#39;;
    case _kDecreaseIndex:
      return &#39;SemanticsAction.decrease&#39;;
    case _kShowOnScreenIndex:
      return &#39;SemanticsAction.showOnScreen&#39;;
    case _kMoveCursorForwardByCharacterIndex:
      return &#39;SemanticsActi