getLayout method Null safety

  1. @override
SliverGridLayout getLayout(
  1. SliverConstraints constraints
)
override

Returns information about the size and position of the tiles in the grid.

Implementation

@override
SliverGridLayout getLayout(SliverConstraints constraints) {
  assert(_debugAssertIsValid());
  final double usableCrossAxisExtent = math.max(
    0.0,
    constraints.crossAxisExtent - crossAxisSpacing * (crossAxisCount - 1),
  );
  final double childCrossAxisExtent = usableCrossAxisExtent / crossAxisCount;
  final double childMainAxisExtent = mainAxisExtent ?? childCrossAxisExtent / childAspectRatio;
  return SliverGridRegularTileLayout(
    crossAxisCount: crossAxisCount,
    mainAxisStride: childMainAxisExtent + mainAxisSpacing,
    crossAxisStride: childCrossAxisExtent + crossAxisSpacing,
    childMainAxisExtent: childMainAxisExtent,
    childCrossAxisExtent: childCrossAxisExtent,
    reverseCrossAxis: axisDirectionIsReversed(constraints.crossAxisDirection),
  );
}