lab6 - готова

lib/components/utils/debounce.dart

@@ -0,0 +1,20 @@
+import 'dart:async';
+import 'dart:ui';
+
+class Debounce{
+  factory Debounce() => _instance;
+
+  Debounce._();
+
+  static final Debounce _instance = Debounce._();
+
+  static Timer? _timer;
+
+  static void run(
+      VoidCallback action, {
+        Duration delay = const Duration(milliseconds: 500),
+  }) {
+    _timer?.cancel();
+    _timer = Timer(delay, action);
+  }
+}

lib/data/dtos/characters_dto.dart

@@ -1,17 +1,36 @@
 import 'package:json_annotation/json_annotation.dart';
-import 'package:labs/CourseStatus.dart';
-
 part 'characters_dto.g.dart';
 
 @JsonSerializable(createToJson: false)
 class CharactersDto{
   final List<CharacterDataDto>? data;
+  final MetaDto? meta;
 
-  const CharactersDto({this.data});
+  const CharactersDto({this.data, this.meta});
 
   factory CharactersDto.fromJson(Map<String, dynamic> json) => _$CharactersDtoFromJson(json);
 }
 
+@JsonSerializable(createToJson: false)
+class MetaDto {
+  final PaginationDto? pagination;
+
+  const MetaDto({this.pagination});
+
+  factory MetaDto.fromJson(Map<String, dynamic> json) => _$MetaDtoFromJson(json);
+}
+
+@JsonSerializable(createToJson: false)
+class PaginationDto {
+  final int? current;
+  final int? next;
+  final int? last;
+
+  const PaginationDto({this.current, this.next, this.last,});
+
+  factory PaginationDto.fromJson(Map<String, dynamic> json) => _$PaginationDtoFromJson(json);
+}
+
 @JsonSerializable(createToJson: false)
 class CharacterDataDto {
   final String? id;

lib/data/dtos/characters_dto.g.dart

@@ -11,6 +11,22 @@ CharactersDto _$CharactersDtoFromJson(Map<String, dynamic> json) =>
       data: (json['data'] as List<dynamic>?)
           ?.map((e) => CharacterDataDto.fromJson(e as Map<String, dynamic>))
           .toList(),
+      meta: json['meta'] == null
+          ? null
+          : MetaDto.fromJson(json['meta'] as Map<String, dynamic>),
+    );
+
+MetaDto _$MetaDtoFromJson(Map<String, dynamic> json) => MetaDto(
+      pagination: json['pagination'] == null
+          ? null
+          : PaginationDto.fromJson(json['pagination'] as Map<String, dynamic>),
+    );
+
+PaginationDto _$PaginationDtoFromJson(Map<String, dynamic> json) =>
+    PaginationDto(
+      current: (json['current'] as num?)?.toInt(),
+      next: (json['next'] as num?)?.toInt(),
+      last: (json['last'] as num?)?.toInt(),
     );
 
 CharacterDataDto _$CharacterDataDtoFromJson(Map<String, dynamic> json) =>

lib/data/mapper/CharacterDataDtoModel.dart

@@ -2,6 +2,7 @@
 
 import 'package:labs/data/dtos/characters_dto.dart';
 import 'package:labs/domain/models/Student.dart';
+import 'package:labs/domain/models/home.dart';
 
 extension CharacterDataDtoToModel on CharacterDataDto{
   Student toDomain() => Student(
@@ -11,3 +12,10 @@ extension CharacterDataDtoToModel on CharacterDataDto{
       image: attributes?.image ?? 'https://gryazoveckij-r19.gosweb.gosuslugi.ru/netcat_files/460/2008/net_foto_muzh.jpg'
       );
 }
+
+extension CharactersDtoToModel on CharactersDto {
+  HomeData toDomain() => HomeData(
+    data: data?.map((e) => e.toDomain()).toList(),
+    nextPage: meta?.pagination?.next,
+  );
+}

lib/domain/models/home.dart

@@ -0,0 +1,8 @@
+import 'Student.dart';
+
+class HomeData {
+  final List<Student>? data;
+  final int? nextPage;
+
+  HomeData({this.data, this.nextPage});
+}

lib/main.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:labs/presentation/home_page/bloc/bloc.dart';
 import 'package:labs/presentation/home_page/home_page.dart';
-import 'CourseStatus.dart';
+import 'package:labs/repo/potter_repo.dart';
 import 'University.dart';
 import 'domain/models/Student.dart';
 
@@ -51,17 +53,22 @@ class _UniversityScreenState extends State<UniversityScreen> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: Text('Строев Владимир, ПИбд-32'),
+    return MaterialApp(
+      title: 'Строев Владимир, ПИбд-32',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(seedColor: Colors.orangeAccent),
+        useMaterial3: true,
       ),
-      body: Column(
-        children: [
-          Expanded(
-            child: MyHomePage(),
-          ),
-        ],
+      home: RepositoryProvider<PotterRepo>(
+        lazy: true,
+        create: (_) => PotterRepo(),
+        child: BlocProvider<HomeBloc>(
+          lazy: false,
+          create: (context) => HomeBloc(context.read<PotterRepo>()),
+          child: const MyHomePage(),
         ),
+      )
     );
   }
 }

lib/presentation/home_page/bloc/bloc.dart

@@ -0,0 +1,39 @@
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:labs/presentation/home_page/bloc/events.dart';
+import 'package:labs/presentation/home_page/bloc/state.dart';
+import 'package:labs/repo/potter_repo.dart';
+
+class HomeBloc extends Bloc<HomeEvent, HomeState> {
+  final PotterRepo repo;
+
+  HomeBloc(this.repo) : super(const HomeState()) {
+    on<HomeLoadDataEvent>(_onLoadData);
+  }
+
+  Future<void> _onLoadData(HomeLoadDataEvent event, Emitter<HomeState> emit) async {
+    if(event.nextPage == null){
+      emit(state.copyWith(isLoading: true));
+    } else {
+      emit(state.copyWith(isPaginationLoading: true));
+    }
+
+    String? error;
+
+    final data = await repo.loadData(
+      q: event.search,
+      page: event.nextPage ?? 1,
+      onError: (e) => error = e,
+    );
+
+    if (event.nextPage != null) {
+      data?.data?.insertAll(0, state.data?.data ?? []);
+    }
+
+    emit(state.copyWith(
+        isLoading: false,
+        isPaginationLoading: false,
+        data: data,
+        error: error,
+    ));
+  }
+}

lib/presentation/home_page/bloc/events.dart

@@ -0,0 +1,10 @@
+abstract class HomeEvent{
+  const HomeEvent();
+}
+
+class HomeLoadDataEvent extends HomeEvent{
+  final String? search;
+  final int? nextPage;
+
+  const HomeLoadDataEvent({this.search, this.nextPage});
+}

lib/presentation/home_page/bloc/state.dart

@@ -0,0 +1,42 @@
+import 'package:equatable/equatable.dart';
+import 'package:copy_with_extension/copy_with_extension.dart';
+
+import '../../../domain/models/home.dart';
+
+part 'state.g.dart';
+
+@CopyWith()
+class HomeState extends Equatable {
+  final HomeData? data;
+  final bool isLoading;
+  final bool isPaginationLoading;
+  final String? error;
+
+  const HomeState({
+    this.data,
+    this.isLoading = false,
+    this.isPaginationLoading = false,
+    this.error,
+  });
+
+  HomeState copyWith({
+    HomeData? data,
+    bool? isLoading,
+    bool? isPaginationLoading,
+    String? error,
+  }) =>
+      HomeState(
+        data: data ?? this.data,
+        isLoading: isLoading ?? this.isLoading,
+        isPaginationLoading: isPaginationLoading ?? this.isPaginationLoading,
+        error: error ?? this.error,
+      );
+
+  @override
+  List<Object?> get props => [
+    data,
+    isLoading,
+    isPaginationLoading,
+    error,
+  ];
+}

lib/presentation/home_page/home_page.dart

@@ -1,9 +1,13 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:labs/presentation/details_page/details_page.dart';
-import 'package:labs/repo/mock_repo.dart';
+import 'package:labs/presentation/home_page/bloc/events.dart';
 import 'package:labs/repo/potter_repo.dart';
+import '../../components/utils/debounce.dart';
 import '../../domain/models/Student.dart';
+import 'bloc/bloc.dart';
+import 'bloc/state.dart';
 part 'card.dart';
 
 class MyHomePage extends StatefulWidget {
@@ -14,14 +18,39 @@ class MyHomePage extends StatefulWidget {
 }
 
 class _MyHomePageState extends State<MyHomePage> {
-  final TextEditingController searchController = TextEditingController();
+  final searchController = TextEditingController();
+  final scrollController = ScrollController();
   final PotterRepo repo = PotterRepo();
   late Future<List<Student>?> data;
 
   @override
   void initState() {
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      context.read<HomeBloc>().add(const HomeLoadDataEvent());
+    });
+
+    scrollController.addListener(_onNextPageListener);
+
     super.initState();
-    data = repo.loadData(null);
+  }
+
+  void _onNextPageListener(){
+    if(scrollController.offset > scrollController.position.maxScrollExtent) {
+      final bloc = context.read<HomeBloc>();
+      if(!bloc.state.isPaginationLoading) {
+        bloc.add(HomeLoadDataEvent (
+          search: searchController.text,
+          nextPage: bloc.state.data?.nextPage,
+        ));
+      }
+    }
+  }
+
+  @override
+  void dispose(){
+    searchController.dispose();
+    scrollController.dispose();
+    super.dispose();
   }
 
   @override
@@ -35,33 +64,32 @@ class _MyHomePageState extends State<MyHomePage> {
             child: CupertinoSearchTextField(
               controller: searchController,
               onChanged: (search) {
-                setState(() {
-                  data = repo.loadData(search);
-                });
+                Debounce.run(() => context.read<HomeBloc>().add(HomeLoadDataEvent(search: search)));
               },
             ),
           ),
-          Expanded(
-            child: Center(
-              child: FutureBuilder<List<Student>?>(
-                future: data,
-                builder: (context, snapshot) => SingleChildScrollView(
-                  child: snapshot.hasData
-                      ? Column(
-                    mainAxisAlignment: MainAxisAlignment.center,
-                    children: snapshot.data!.map((e) {
-                      return _Card.fromData(
-                        e,
+          BlocBuilder<HomeBloc, HomeState>(
+            builder: (context, state) => state.isLoading
+              ? const CircularProgressIndicator()
+                : Expanded(
+                  child: RefreshIndicator(
+                  onRefresh: _onRefresh,
+                child: ListView.builder(
+                  padding: EdgeInsets.zero,
+                  itemCount: state.data?.data?.length ?? 0,
+                  itemBuilder: (context, index) {
+                    final data = state.data?.data?[index];
+                    return data != null
+                        ? _Card.fromData(data,
                         onLike: (title, isLiked) =>
                         _showSnackBar(context, title, isLiked),
-                        onTap: () => _navToDetails(context, e),
-                      );
-                    }).toList(),
+                    onTap: () => _navToDetails(context, data),
                     )
-                      : const CircularProgressIndicator(),
-                ),
+                        : const SizedBox.shrink();
+                  },
                 ),
                 ),
+              )
             ),
         ],
       ),
@@ -75,6 +103,11 @@ class _MyHomePageState extends State<MyHomePage> {
     );
   }
 
+  Future<void> _onRefresh() {
+    context.read<HomeBloc>().add(HomeLoadDataEvent(search: searchController.text));
+    return Future.value(null);
+  }
+
   void _showSnackBar(BuildContext context, String title, bool isLiked) {
     WidgetsBinding.instance.addPostFrameCallback((_) {
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(

lib/repo/api_interface.dart

@@ -1,6 +1,8 @@
 
-import '../domain/models/Student.dart';
+import '../domain/models/home.dart';
+
+typedef OnErrorCallback = void Function(String? error);
 
 abstract class ApiInterface{
-  Future<List<Student>?> loadData(String? q);
+  Future<HomeData?> loadData({OnErrorCallback? onError});
 }

lib/repo/mock_repo.dart

@@ -1,15 +1,19 @@
 import 'package:labs/CourseStatus.dart';
 import 'package:labs/domain/models/Student.dart';
 
+import '../domain/models/home.dart';
 import 'api_interface.dart';
 
 class MockRepo extends ApiInterface {
   @override
-  Future<List<Student>?> loadData(String? q) async {
-    return [
+  Future<HomeData?> loadData({OnErrorCallback? onError}) async {
+    return HomeData (
+
+    );
+    /*return [
       Student('Stroev V.', 19, [CourseStatus.Biology.name]),
       Student('Samoilov K.', 20, [CourseStatus.Chemistry.name]),
       Student('Belov M.', 21, [CourseStatus.ComputerScience.name]),
-    ];
+    ];*/
   }
 }

lib/repo/potter_repo.dart

@@ -4,6 +4,7 @@ import 'package:pretty_dio_logger/pretty_dio_logger.dart';
 
 import '../data/dtos/characters_dto.dart';
 import '../domain/models/Student.dart';
+import '../domain/models/home.dart';
 import 'api_interface.dart';
 
 class PotterRepo extends ApiInterface {
@@ -16,16 +17,27 @@ class PotterRepo extends ApiInterface{
   static const String _baseUrl = 'https://api.potterdb.com';
 
   @override
-  Future<List<Student>?> loadData(String? q) async {
-
+  Future<HomeData?> loadData(
+      {OnErrorCallback? onError, String? q, int page = 1, int pageSize = 25}) async {
+    try {
       const String url = '$_baseUrl/v1/characters';
 
-      final Response<dynamic> response = await _dio.get<Map<dynamic, dynamic>>(url,
-      queryParameters: q != null ? {'filter[name_cont]': q} : null,);
+      final Response<dynamic> response = await _dio.get<Map<dynamic, dynamic>>(
+        url,
+        queryParameters: {
+          'filter[name_count]': q,
+          'page[number]': page,
+          'page[size]': pageSize,
+        },
+      );
 
-      final CharactersDto dto = CharactersDto.fromJson(response.data as Map<String, dynamic>);
-      final List<Student>? data = dto.data?.map((e) => e.toDomain()).toList();
+      final CharactersDto dto = CharactersDto.fromJson(
+          response.data as Map<String, dynamic>);
+      final HomeData data = dto.toDomain();
       return data;
-
+    } on DioException catch (e) {
+      onError?.call(e.error?.toString());
+      return null;
+    }
   }
 }

pubspec.lock

@@ -38,6 +38,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.11.0"
+  bloc:
+    dependency: transitive
+    description:
+      name: bloc
+      sha256: "106842ad6569f0b60297619e9e0b1885c2fb9bf84812935490e6c5275777804e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.1.4"
   boolean_selector:
     dependency: transitive
     description:
@@ -138,10 +146,10 @@ packages:
     dependency: transitive
     description:
       name: code_builder
-      sha256: f692079e25e7869c14132d39f223f8eec9830eb76131925143b2129c4bb01b37
+      sha256: "0ec10bf4a89e4c613960bf1e8b42c64127021740fb21640c29c909826a5eea3e"
       url: "https://pub.dev"
     source: hosted
-    version: "4.10.0"
+    version: "4.10.1"
   collection:
     dependency: transitive
     description:
@@ -158,6 +166,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.1.2"
+  copy_with_extension:
+    dependency: transitive
+    description:
+      name: copy_with_extension
+      sha256: fbcf890b0c34aedf0894f91a11a579994b61b4e04080204656b582708b5b1125
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.0.4"
+  copy_with_extension_gen:
+    dependency: "direct main"
+    description:
+      name: copy_with_extension_gen
+      sha256: "51cd11094096d40824c8da629ca7f16f3b7cea5fc44132b679617483d43346b0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.0.4"
   crypto:
     dependency: transitive
     description:
@@ -198,6 +222,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.0"
+  equatable:
+    dependency: "direct main"
+    description:
+      name: equatable
+      sha256: c2b87cb7756efdf69892005af546c56c0b5037f54d2a88269b4f347a505e3ca2
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.5"
   fake_async:
     dependency: transitive
     description:
@@ -227,6 +259,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_bloc:
+    dependency: "direct main"
+    description:
+      name: flutter_bloc
+      sha256: b594505eac31a0518bdcb4b5b79573b8d9117b193cc80cc12e17d639b10aa27a
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.1.6"
   flutter_lints:
     dependency: "direct dev"
     description:
@@ -392,6 +432,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.0"
+  nested:
+    dependency: transitive
+    description:
+      name: nested
+      sha256: "03bac4c528c64c95c722ec99280375a6f2fc708eec17c7b3f07253b626cd2a20"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   package_config:
     dependency: transitive
     description:
@@ -424,6 +472,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.0"
+  provider:
+    dependency: transitive
+    description:
+      name: provider
+      sha256: c8a055ee5ce3fd98d6fc872478b03823ffdb448699c6ebdbbc71d59b596fd48c
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.2"
   pub_semver:
     dependency: transitive
     description:

pubspec.yaml

@@ -39,6 +39,9 @@ dependencies:
   json_annotation: ^4.9.0
   dio: ^5.4.2+1
   pretty_dio_logger: ^1.3.1
+  equatable: ^2.0.5
+  flutter_bloc: ^8.1.6
+  copy_with_extension_gen: ^5.0.4
 
 dev_dependencies:
   flutter_test:

test/widget_test.dart

@@ -13,7 +13,7 @@ import 'package:labs/main.dart';
 void main() {
   testWidgets('Counter increments smoke test', (WidgetTester tester) async {
     // Build our app and trigger a frame.
-    await tester.pumpWidget(const MyApp());
+    await tester.pumpWidget(MyApp());
 
     // Verify that our counter starts at 0.
     expect(find.text('0'), findsOneWidget);