childCount property
The maximum number of children that can be provided to RenderListWheelViewport.
If non-null, the children will have index in the range
[0, childCount - 1]
.
If null, then there's no explicit limits to the range of the children except that it has to be contiguous. If childExistsAt for a certain index returns false, that index is already past the limit.
Implementation
int? get childCount;