estimatedChildCount property
The best available estimate of childCount, or null if no estimate is available.
This differs from childCount in that childCount never returns null (and must not be accessed if the child count is not yet available, meaning the createChild method has not been provided an index that does not create a child).
See also:
- SliverChildDelegate.estimatedChildCount, to which this getter defers.
Implementation
int? get estimatedChildCount => null;