YYHome/packages/cs_widgets/lib/custom_sliver_persistent_header_delegate.dart

import 'package:flutter/material.dart';

class CustomSliverPersistentHeaderDelegate extends SliverPersistentHeaderDelegate {
  final double minHeight;
  final double maxHeight;
  final Widget child;

  CustomSliverPersistentHeaderDelegate({
    required this.minHeight,
    required this.maxHeight,
    required this.child,
  });

  @override
  double get minExtent => minHeight;

  @override
  double get maxExtent => maxHeight;

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

  @override
  bool shouldRebuild(CustomSliverPersistentHeaderDelegate oldDelegate) {
    return maxHeight != oldDelegate.maxHeight || minHeight != oldDelegate.minHeight || child != oldDelegate.child;
  }

}