computeMaxScrollOffset method

@override double computeMaxScrollOffset(int childCount)

The scroll extent needed to fully display all the tiles if there are childCount children in total.

The child count will never be null.

Implementation

@override
double computeMaxScrollOffset(int childCount) {
  if (childCount == 0) {
    return 0.0;
  }
  if (childCount <= _geometries.length) {
    final rectangle = _geometries[childCount - 1];
    // print(
    //     'computeMaxScrollOffset(childCount=$childCount):'
    //    ' ${rectangle.bottom}');
    return rectangle.bottom;
  }
  // print(
  //     'computeMaxScrollOffset(childCount=$childCount): '
  // 'guessing ${(childCount ~/ columns) * columnWidth * 2.0}');
  return (childCount ~/ columns) * columnWidth * 2.0;
}