getCrossAxisOffset method
Return the offset of the child in the non-scrolling axis.
Implementation
double getCrossAxisOffset(
SliverConstraints constraints, int? crossAxisIndex) {
final bool reverseCrossAxis =
axisDirectionIsReversed(constraints.crossAxisDirection);
final int crossAxisCount = getCrossAxisCount(constraints);
final double childUsableCrossAxisExtent =
getChildUsableCrossAxisExtent(constraints);
final int actualCrossAxisIndex = (reverseCrossAxis && crossAxisCount > 1)
? crossAxisCount - 1 - crossAxisIndex!
: crossAxisIndex!;
return actualCrossAxisIndex %
crossAxisCount *
(childUsableCrossAxisExtent + crossAxisSpacing);
}