info_tren/lib/components/sliver_persistent_header_padding.dart

import 'package:flutter/material.dart';

class SliverPersistentHeaderPadding extends StatelessWidget {
  final double maxHeight;

  const SliverPersistentHeaderPadding({required this.maxHeight});

  @override
  Widget build(BuildContext context) {
    return SliverPersistentHeader(
      delegate: _SliverPersistentHeaderPaddingDelegate(maxHeight: maxHeight,),
      floating: false,
      pinned: false,
    );
  }
}

class _SliverPersistentHeaderPaddingDelegate extends SliverPersistentHeaderDelegate {
  final double maxHeight;

  const _SliverPersistentHeaderPaddingDelegate({required this.maxHeight});

  @override
  Widget build(BuildContext context, double shrinkOffset, bool overlapsContent) {
    return Container();
  }

  @override
  double get maxExtent => maxHeight;

  @override
  double get minExtent => 0;

  @override
  bool shouldRebuild(covariant SliverPersistentHeaderDelegate oldDelegate) {
    return oldDelegate.maxExtent != maxExtent;
  }
}