ion.didGainAccessibilityFocus&#39;;
    case _kDidLoseAccessibilityFocusIndex:
      return &#39;SemanticsAction.didLoseAccessibilityFocus&#39;;
    case _kCustomAction:
      return &#39;SemanticsAction.customAction&#39;;
    case _kDismissIndex:
      return &#39;SemanticsAction.dismiss&#39;;
    case _kMoveCursorForwardByWordIndex:
      return &#39;SemanticsAction.moveCursorForwardByWord&#39;;
    case _kMoveCursorBackwardByWordIndex:
      return &#39;SemanticsAction.moveCursorBackwardByWord&#39;;
  }
