import 'package:flutter/material.dart';

class HomeGoodsDelegate extends SliverPersistentHeaderDelegate {

  @override
  Widget build(
      BuildContext context, double shrinkOffset, bool overlapsContent) {
    // print(shrinkOffset.toString());
    return Container(
      color: Colors.red,
      alignment: Alignment.center,
      child: TabBar(
        controller: TabController(initialIndex: 0, length: 6, vsync: ScrollableState()),
        isScrollable: true,
        tabs: <Widget>[
          Tab(icon: Icon(Icons.local_florist)),
          Tab(icon: Icon(Icons.change_history)),
          Tab(icon: Icon(Icons.directions_bike)),
          Tab(icon: Icon(Icons.local_florist)),
          Tab(icon: Icon(Icons.change_history)),
          Tab(icon: Icon(Icons.directions_bike)),
        ],
      ),
    );
  }

  @override
  double get maxExtent => 64.0;

  @override
  double get minExtent => 64.0;

  @override
  bool shouldRebuild(SliverPersistentHeaderDelegate oldDelegate) =>
      false; // 如果内容需要更新，设置为true
}