FixedScrollMetrics constructor Null safety

FixedScrollMetrics(
  1. {required double? minScrollExtent,
  2. required double? maxScrollExtent,
  3. required double? pixels,
  4. required double? viewportDimension,
  5. required AxisDirection axisDirection}
)

Creates an immutable snapshot of values associated with a Scrollable viewport.

Implementation

FixedScrollMetrics({
  required double? minScrollExtent,
  required double? maxScrollExtent,
  required double? pixels,
  required double? viewportDimension,
  required this.axisDirection,
}) : _minScrollExtent = minScrollExtent,
     _maxScrollExtent = maxScrollExtent,
     _pixels = pixels,
     _viewportDimension = viewportDimension;