on.moveCursorForwardByCharacter&#39;;
    case _kMoveCursorBackwardByCharacterIndex:
      return &#39;SemanticsAction.moveCursorBackwardByCharacter&#39;;
    case _kSetSelectionIndex:
      return &#39;SemanticsAction.setSelection&#39;;
    case _kCopyIndex:
      return &#39;SemanticsAction.copy&#39;;
    case _kCutIndex:
      return &#39;SemanticsAction.cut&#39;;
    case _kPasteIndex:
      return &#39;SemanticsAction.paste&#39;;
    case _kDidGainAccessibilityFocusIndex:
      return &#39;SemanticsAct