按下图标时不会重新加载自定义小部件

如何解决按下图标时不会重新加载自定义小部件

我已经在 flutter 工作了几个月，我正在尝试在我的应用程序中实现一个搜索功能。我有一个名为 list_product 的自定义小部件，它接受 uri 和数据作为参数并返回一个 gridview 作为产品卡它第一次工作正常，但是当我尝试更改第二次查询时它不起作用，请任何人帮助解决此问题

这是我的自定义小部件

import 'package:flutter/material.dart';
import 'package:need/user/product_details.dart';
import 'package:need/models.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:need/shop/product%20_detail_shop.dart';

import '../credentials.dart';

class list_products extends StatefulWidget {
  String serverUri;
  var serverData;
  String needId;

  String from;

  list_products({
    Key key,@required this.serverUri,@required this.serverData,this.needId,this.from,}) : super(key: key);

  list_product createState() => list_product();
}

class list_product extends State<list_products>
    with AutomaticKeepAliveClientMixin {
  Future<List<Product>> products;
  @override
  void initState() {
    super.initState();
    products = _fetchProduct();
  }

  Future<List<Product>> _fetchProduct() async {
    print(widget.serverUri);
    print(widget.serverData);
    //json encode
    String body = json.encode(widget.serverData);

    var response = await http.post(widget.serverUri,headers: <String,String>{
          'Content-Type': 'application/json; charset=UTF-8',},body: body);
    print("############################");
    print(response.body);

    if (response.statusCode == 200) {
      final items = json.decode(response.body).cast<Map<String,dynamic>>();
      List<Product> listOfProduct = items.map<Product>((json) {
        return Product.fromJson(json);
      }).toList();

      return listOfProduct;
    } else {
      throw Exception('Failed to load internet');
    }
  }

  bool get wantKeepAlive => true;

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return Container(
        child: FutureBuilder<List<Product>>(
      future: products,builder: (context,snapshot) {
        // if (snapshot.hasError) return Text('error ${snapshot.error}');
        if (!snapshot.hasData)
          return Center(child: CircularProgressIndicator());
        return GridView.count(
          crossAxisCount: 2,childAspectRatio: (160 / 192),crossAxisSpacing: 1.0,mainAxisSpacing: 1.0,shrinkWrap: true,children: snapshot.data.map((product) {
            String price = product.price.toString(); //typeCastinng

           
            return Padding(
                padding: const EdgeInsets.all(1.0),child: new InkWell(
                  onTap: () {}
                  },child: Card(
                      color: Theme.of(context).colorScheme.surface,child: Column(
                          mainAxisAlignment: MainAxisAlignment.spaceEvenly,children: <Widget>[
                            Container(
                                height: 160,width: 160,child: Container(
                                  color: Colors.grey,child: Image(
                                      image: NetworkImage(product.photo),fit: BoxFit.fill),)),ListTile(
                              dense: true,contentPadding: EdgeInsets.only(
                                  left: 5.0,right: 5.0,top: 0.0,bottom: 0.0),visualDensity:
                                  VisualDensity(horizontal: 0,vertical: -4),title: Text(product.title,style: TextStyle(
                                      color: Theme.of(context)
                                          .colorScheme
                                          .onSurface,fontSize: 15,fontWeight: FontWeight.w400),overflow: TextOverflow.visible),trailing: Container(
                                  decoration: BoxDecoration(
                                    borderRadius: BorderRadius.circular(4),color: Colors.greenAccent,),padding:
                                      const EdgeInsets.fromLTRB(6,4,6,4),child: Text(
                                    '\u{20B9}' + price,style: TextStyle(
                                        color: Colors.black,fontWeight: FontWeight.w500),)
                          ])),));
          }).toList(),);
      },));
  }

}

这是我的搜索页面

import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;

import '../credentials.dart';
import '../models.dart';
import '../widgets/gridview_product.dart';

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

  @override
  _SearchState createState() => _SearchState();
}

class _SearchState extends State<Search> {
  final controller = TextEditingController();
  String uuri;
  var data;

  Future<List<Product>> _fetchProduct() async {
    String query = controller.text;
    final String uri = '$domain/user/search/product/$query';
    var response = await http.get(uri,String>{
      'Content-Type': 'application/json; charset=UTF-8',});

    if (response.statusCode == 200) {
      final items = json.decode(response.body).cast<Map<String,dynamic>>();
      List<Product> listOfProduct = items.map<Product>((json) {
        return Product.fromJson(json);
      }).toList();

      return listOfProduct;
    } else {
      throw Exception('Failed to load internet');
    }
  }

  // Widget _buildsearch() {
  //   return list_products(server_uri: uuri,server_data: data);
  // }

  Widget display = Center(child: Text("Search"));
  final _formKey = GlobalKey<FormState>();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        resizeToAvoidBottomInset: false,appBar: AppBar(
          toolbarHeight: 90,title: Form(
            key: _formKey,child: TextFormField(
              autofocus: true,controller: controller,textInputAction: TextInputAction.search,decoration: InputDecoration(
                hintText: "Search",validator: (value) {
                if (value.isEmpty) {
                  return 'Enter your interest';
                }
                return null;
              },actions: <Widget>[
            IconButton(
              onPressed: () {
                if (_formKey.currentState.validate()) {
                  setState(() {
                    String query = controller.text;
                    uuri = '$domain/user/search/product';
                    data = {"query": query};
                    display = list_products(
                        serverUri: uuri,serverData: data,from: "user");
                  });
                }
              },icon: Icon(Icons.search),],body: Container(child: display));
  }
}