Add: category on detail page and searching by API

lib/pages/main.dart

@@ -14,7 +14,6 @@ import 'package:gymlink_module_web/tools/relative.dart';
 import 'package:gymlink_module_web/tools/routes.dart';
 import 'package:lazy_load_scrollview/lazy_load_scrollview.dart';
 import 'package:provider/provider.dart';
-import 'package:url_launcher/url_launcher.dart';
 
 const List<Map<String, String>> testData = [
   {
@@ -67,10 +66,10 @@ class MainPage extends StatefulWidget {
 class _MainPageState extends State<MainPage> {
   String searchText = '';
   List<GymItem> filteredData = [];
-  List<GymItem> items = [];
   int cartLength = 0;
   int itemViewCount = 0;
   bool isLoading = false;
+  List<GymCategory> categories = [];
 
   @override
   void initState() {
@@ -82,7 +81,6 @@ class _MainPageState extends State<MainPage> {
     });
     getItems(context).then((value) => setState(() {
           filteredData = value;
-          items = value;
           itemViewCount = min(5, value.length);
           WidgetsBinding.instance.addPostFrameCallback((_) {
             for (var element in filteredData.sublist(0, itemViewCount)) {
@@ -90,13 +88,9 @@ class _MainPageState extends State<MainPage> {
             }
           });
         }));
-  }
-
-  Future<void> _goToPage() async {
-    final Uri url = Uri.parse('https://google.com');
-    if (!await launchUrl(url, webOnlyWindowName: '_blank')) {
-      throw 'Could not launch $url';
-    }
+    getCategories(context).then((value) => setState(() {
+          categories = value;
+        }));
   }
 
   void _onLoad() async {
@@ -112,12 +106,12 @@ class _MainPageState extends State<MainPage> {
     }
   }
 
-  void _onSearch() {
+  void _onSearch() async {
+    final data = await getItems(context, searchText: searchText);
     setState(() {
-      filteredData = items
-          .where((element) => (element.title).contains(searchText))
-          .toList();
-      itemViewCount = min(filteredData.length, itemViewCount);
+      filteredData = data;
+      itemViewCount =
+          min(filteredData.length, searchText == '' ? 5 : itemViewCount);
     });
     WidgetsBinding.instance.addPostFrameCallback((_) {
       for (var element in filteredData.sublist(0, itemViewCount)) {
@@ -216,10 +210,10 @@ class _MainPageState extends State<MainPage> {
               child: Scrollbar(
                 child: ListView(
                   children: [
-                    items.isEmpty
-                        ? const Center(child: CircularProgressIndicator())
+                    filteredData.isEmpty && searchText != ''
+                        ? const Center(child: Text('Ничего не найдено'))
                         : filteredData.isEmpty
-                            ? const Center(child: Text('Ничего не найдено'))
+                            ? const Center(child: CircularProgressIndicator())
                             : GridView.builder(
                                 physics: const NeverScrollableScrollPhysics(),
                                 shrinkWrap: true,