我想要的逻辑是显示一个类别列表，当一个类别被选中时，它下面的类别就会被下推，选中的类别产品就会显示出来。
下面是我目前正在使用的最小代码：

class CategoryPage extends StatefulWidget {
  const CategoryPage({Key key}) : super(key: key);

  @override
  State<CategoryPage> createState() => _CategoryPageState();
}

class _CategoryPageState extends State<CategoryPage> {
  Category selectedCategory;

  final List<Category> categories = [
    Category(name: 'Breakfast', products: ['Cake', 'Sandwich']),
    Category(name: 'Lunch', products: ['Chicken', 'Pizza']),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Minimal Example')),
      body: ListView.builder(
        itemCount: categories.length,
        itemBuilder: (context, index) {
          final category = categories[index];
          return Column(
            children: [
              GestureDetector(
                onTap: () {
                  setState(() {
                    selectedCategory = category;
                  });
                },
                child: Container(
                  padding: const EdgeInsets.symmetric(vertical: 10),
                  margin: const EdgeInsets.only(top: 10),
                  alignment: Alignment.center,
                  width: double.infinity,
                  decoration: BoxDecoration(
                    color: selectedCategory == category
                        ? Colors.green
                        : Colors.grey,
                  ),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceAround,
                    children: [
                      Text(category.name),
                      Icon(
                        selectedCategory == category
                            ? Icons.keyboard_arrow_up
                            : Icons.keyboard_arrow_down,
                      ),
                    ],
                  ),
                ),
              ),
              if (selectedCategory == category)
                ListView.builder(
                  shrinkWrap: true,
                  itemCount: category.products.length,
                  itemBuilder: (context, index) {
                    final product = category.products[index];
                    return Text(product);
                  },
                )
            ],
          );
        },
      ),
    );
  }
}

还有一张截图：第一节第一节第一节第一节第一次
现在我想做的是不要使用shrinkWrap，因为这将消除使用ListView.builder（）所带来的性能增益。
有什么办法能解决这个问题