CalendarMarkerWidget constructor Null safety

CalendarMarkerWidget(
  1. {Key? key,
  2. required CalendarMarker marker,
  3. required Rect rect,
  4. Color color = Colors.orange,
  5. Color textColor = Colors.white,
  6. int index = INDEX_FULL,
  7. DataCallback? onPress,
  8. DataCallback? onLongPress}
)