import 'package:flutter/cupertino.dart';

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

  MySliverPersistentHeaderDelegate({
    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 SizedBox.expand(child: child);
  }

  @override
  bool shouldRebuild(covariant SliverPersistentHeaderDelegate oldDelegate) {
    return true; // 当需要重新构建时返回true
  }
}