6 lab architecture, pagination, searchController

lib/components/utils/debounce.dart

@@ -0,0 +1,22 @@
+import 'dart:async';
+import 'dart:ui';
+
+import 'package:flutter/cupertino.dart';
+
+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/components/utils/error_callback.dart

@@ -0,0 +1 @@
+typedef OnErrorCallback = void Function(String? error)?;

lib/data/dtos/mangas_dto.dart

@@ -5,12 +5,26 @@ part 'mangas_dto.g.dart';
 @JsonSerializable(createToJson: false)
 class MangasDto {
   final List<MangaDataDto>? data;
-
+  final MangaPaginationDto? pagination;
-  const MangasDto({this.data});
+  const MangasDto({this.data, this.pagination});
 
   factory MangasDto.fromJson(Map<String, dynamic> json) =>
       _$MangasDtoFromJson(json);
 }
+@JsonSerializable(createToJson: false)
+class MangaPaginationDto {
+  @JsonKey(name: 'current_page')
+  final int? currentPage;
+  @JsonKey(name: 'has_next_page')
+  final bool? hasNextPage;
+  @JsonKey(name: 'last_visible_page')
+  final int? lastVisiblePage;
+
+  const MangaPaginationDto({this.currentPage, this.hasNextPage, this.lastVisiblePage});
+
+  factory MangaPaginationDto.fromJson(Map<String, dynamic> json) =>
+      _$MangaPaginationDtoFromJson(json);
+}
 
 @JsonSerializable(createToJson: false)
 class MangaDataDto {

lib/data/dtos/mangas_dto.g.dart

@@ -10,6 +10,17 @@ MangasDto _$MangasDtoFromJson(Map<String, dynamic> json) => MangasDto(
       data: (json['data'] as List<dynamic>?)
           ?.map((e) => MangaDataDto.fromJson(e as Map<String, dynamic>))
           .toList(),
+      pagination: json['pagination'] == null
+          ? null
+          : MangaPaginationDto.fromJson(
+              json['pagination'] as Map<String, dynamic>),
+    );
+
+MangaPaginationDto _$MangaPaginationDtoFromJson(Map<String, dynamic> json) =>
+    MangaPaginationDto(
+      currentPage: (json['current_page'] as num?)?.toInt(),
+      hasNextPage: json['has_next_page'] as bool?,
+      lastVisiblePage: (json['last_visible_page'] as num?)?.toInt(),
     );
 
 MangaDataDto _$MangaDataDtoFromJson(Map<String, dynamic> json) => MangaDataDto(

lib/data/mappers/mangas_mapper.dart

@@ -1,5 +1,6 @@
 import 'package:flutter_app/data/dtos/mangas_dto.dart';
 import 'package:flutter_app/domain/models/carddata.dart';
+import 'package:flutter_app/presentation/home_page/home_page.dart';
 
 extension MangaDataDtoMapper on MangaDataDto {
   CardData toDomain() => CardData(
@@ -9,3 +10,10 @@ extension MangaDataDtoMapper on MangaDataDto {
             'Статус: ${status}. Рейтинг: ${score}. Людей поставило оценку: ${scored_by}',
       );
 }
+extension MangasDtoToModel on MangasDto {
+  HomeData toDomain() => HomeData(
+    data: data?.map((e) => e.toDomain()).toList(),
+      nextPage: (pagination?.hasNextPage ?? false)
+          ? ((pagination?.currentPage ?? 0) + 1)
+          : null);
+}

lib/data/repositories/api_interface.dart

@@ -1,5 +1,6 @@
-import 'package:flutter_app/domain/models/carddata.dart';
+import 'package:flutter_app/components/utils/error_callback.dart';
+import 'package:flutter_app/presentation/home_page/home_page.dart';
 
 abstract class ApiInterface {
-  Future<List<CardData>?> loadData();
+  Future<HomeData?> loadData({OnErrorCallback? onError});
 }

lib/data/repositories/manga_repository.dart

@@ -1,8 +1,9 @@
+import 'package:flutter_app/components/utils/error_callback.dart';
 import 'package:flutter_app/data/dtos/mangas_dto.dart';
 import 'package:flutter_app/data/mappers/mangas_mapper.dart';
 import 'package:flutter_app/data/repositories/api_interface.dart';
 import 'package:dio/dio.dart';
-import 'package:flutter_app/domain/models/carddata.dart';
+import 'package:flutter_app/presentation/home_page/home_page.dart';
 import 'package:pretty_dio_logger/pretty_dio_logger.dart';
 
 class MangaRepository extends ApiInterface {
@@ -14,18 +15,28 @@ class MangaRepository extends ApiInterface {
   static const String _baseUrl = 'https://api.jikan.moe';
 
   @override
-  Future<List<CardData>?> loadData({String? q}) async {
+  Future<HomeData?> loadData({
+    OnErrorCallback? onError,
+    String? q,
+    int page = 1,
+    int pageSize = 25,
+  }) async {
     try {
       const String url = '$_baseUrl/v4/manga';
 
-      final Response<dynamic> response = await _dio.get<Map<dynamic, dynamic>>(
+      final Response<dynamic> response = await _dio
-          url,
+          .get<Map<dynamic, dynamic>>(url, queryParameters: {
-          queryParameters: q != null ? {'q': q} : null);
+        'q': q,
+        'page': page,
+        'limit': !(pageSize > 25) ? pageSize : 25
+      });
+
       final MangasDto dto =
           MangasDto.fromJson(response.data as Map<String, dynamic>);
-      final List<CardData>? data = dto.data?.map((e) => e.toDomain()).toList();
+      final HomeData? data = dto.toDomain();
       return data;
     } on DioException catch (e) {
+      onError?.call(e.response?.statusMessage);
       return null;
     }
   }

lib/data/repositories/mock_repository.dart

@@ -1,14 +1,18 @@
+import 'package:flutter_app/components/utils/error_callback.dart';
 import 'package:flutter_app/data/repositories/api_interface.dart';
 import 'package:flutter_app/domain/models/carddata.dart';
+import 'package:flutter_app/presentation/home_page/home_page.dart';
 
 class MockRepository extends ApiInterface {
   @override
-  Future<List<CardData>?> loadData() async {
+  Future<HomeData?> loadData({OnErrorCallback? onError}) async {
-    return [
+    return HomeData(
+       data: [
       CardData('JoJo’s Bizarre Adventure', descriptionText: 'kono dio da', imageUrl: 'https://i1.sndcdn.com/avatars-253MmMf9QZzxVBJi-rvlyeg-t1080x1080.jpg'),
       CardData('Example', descriptionText: 'what is this?', imageUrl: 'https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQvaBQ6nAedlqvXsh-dLXZi2Gexy1RkDbTUKQ&s'),
       CardData('Mock data', descriptionText: 'Mock data description', imageUrl: 'https://cdn-user30887.skyeng.ru/uploads/6692a339c6989979804399.png'),
-    ];
+    ],
+    );
   }
 
 }

lib/main.dart

@@ -1,5 +1,8 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_app/data/repositories/manga_repository.dart';
+import 'package:flutter_app/presentation/home_page/bloc/bloc.dart';
 import 'package:flutter_app/presentation/home_page/home_page.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 
 void main() {
   runApp(const MyApp());
@@ -14,25 +17,18 @@ class MyApp extends StatelessWidget {
     return MaterialApp(
       title: 'Flutter Demo',
       theme: ThemeData(
-        // This is the theme of your application.
-        //
-        // TRY THIS: Try running your application with "flutter run". You'll see
-        // the application has a purple toolbar. Then, without quitting the app,
-        // try changing the seedColor in the colorScheme below to Colors.green
-        // and then invoke "hot reload" (save your changes or press the "hot
-        // reload" button in a Flutter-supported IDE, or press "r" if you used
-        // the command line to start the app).
-        //
-        // Notice that the counter didn't reset back to zero; the application
-        // state is not lost during the reload. To reset the state, use hot
-        // restart instead.
-        //
-        // This works for code too, not just values: Most code changes can be
-        // tested with just a hot reload.
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
         useMaterial3: true,
       ),
-      home: const MyHomePage(title: 'Разубаев Сергей Михайлович'),
+      home: RepositoryProvider<MangaRepository>(
+        lazy: true,
+        create: (_) => MangaRepository(),
+        child: BlocProvider<HomeBloc>(
+          lazy: false,
+          create: (context) => HomeBloc(context.read<MangaRepository>()),
+          child: const HomePage(),
+        ),
+      )
     );
   }
 }

lib/presentation/home_page/bloc/bloc.dart

@@ -0,0 +1,27 @@
+import 'package:flutter_app/data/repositories/manga_repository.dart';
+import 'package:flutter_app/presentation/home_page/bloc/events.dart';
+import 'package:flutter_app/presentation/home_page/bloc/state.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+
+class HomeBloc extends Bloc<HomeEvent, HomeState>{
+  final MangaRepository 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));
+      }
+
+    final data = await repo.loadData(q: event.search, page: event.nextPage ?? 1);
+
+    if (event.nextPage != null) {
+      data?.data?.insertAll(0, state.data?.data ?? []);
+    }
+
+    emit(state.copyWith(data: data, isLoading: false, isPaginationLoading: false));
+  }
+}

lib/presentation/home_page/bloc/events.dart

@@ -0,0 +1,9 @@
+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 +1,15 @@
+import 'package:equatable/equatable.dart';
+import 'package:flutter_app/presentation/home_page/home_page.dart';
+
+class HomeState extends Equatable {
+  final HomeData? data;
+  final bool isLoading;
+  final bool isPaginationLoading;
+  const HomeState({this.data, this.isLoading = false, this.isPaginationLoading = false});
+
+  HomeState copyWith({HomeData? data, bool? isLoading, bool? isPaginationLoading}) => HomeState(
+      data: data ?? this.data, isLoading: isLoading ?? this.isLoading, isPaginationLoading: isPaginationLoading ?? this.isPaginationLoading);
+
+  @override
+  List<Object?> get props => [data, isLoading, isPaginationLoading];
+}

lib/presentation/home_page/home_page.dart

@@ -1,48 +1,35 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_app/components/utils/debounce.dart';
 import 'package:flutter_app/data/repositories/manga_repository.dart';
 import 'package:flutter_app/data/repositories/mock_repository.dart';
 import 'package:flutter_app/presentation/details_page/details_page.dart';
+import 'package:flutter_app/presentation/home_page/bloc/bloc.dart';
+import 'package:flutter_app/presentation/home_page/bloc/events.dart';
+import 'package:flutter_app/presentation/home_page/bloc/state.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 
 import '../../domain/models/carddata.dart';
 
 part 'card.dart';
 
-
+class HomePage extends StatefulWidget {
-class MyHomePage extends StatefulWidget {
+  const HomePage({super.key});
-  const MyHomePage({super.key, required this.title});
-
-  // This widget is the home page of your application. It is stateful, meaning
-  // that it has a State object (defined below) that contains fields that affect
-  // how it looks.
-
-  // This class is the configuration for the state. It holds the values (in this
-  // case the title) provided by the parent (in this case the App widget) and
-  // used by the build method of the State. Fields in a Widget subclass are
-  // always marked "final".
-
-  final String title;
 
   @override
-  State<MyHomePage> createState() => _MyHomePageState();
+  State<HomePage> createState() => _HomePageState();
 }
 
-class _MyHomePageState extends State<MyHomePage> {
+class _HomePageState extends State<HomePage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        backgroundColor: Theme
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
-            .of(context)
-            .colorScheme
-            .inversePrimary,
-        title: Text(widget.title),
       ),
       body: const Body(),
     );
   }
-
-
 }
 
 class Body extends StatefulWidget {
@@ -53,6 +40,37 @@ class Body extends StatefulWidget {
 }
 
 class _BodyState extends State<Body> {
+  final scrollController = ScrollController();
+  final searchController = TextEditingController();
+
+  @override
+  void initState() {
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      context.read<HomeBloc>().add(const HomeLoadDataEvent());
+    });
+    scrollController.addListener(_onNextPageListener);
+
+    super.initState();
+  }
+
+  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();
+  }
+
   final MangaRepository repo = MangaRepository();
   var data = MangaRepository().loadData();
 
@@ -61,10 +79,7 @@ class _BodyState extends State<Body> {
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(
         content: Text(
           'Лайк на $title ${isLiked ? 'поставлен' : 'убран'}',
-          style: Theme
+          style: Theme.of(context).textTheme.bodyLarge,
-              .of(context)
-              .textTheme
-              .bodyLarge,
         ),
         backgroundColor: Colors.orangeAccent,
         duration: const Duration(seconds: 1),
@@ -77,9 +92,15 @@ class _BodyState extends State<Body> {
         context, CupertinoPageRoute(builder: (context) => DetailsPage(data)));
   }
 
+  Future<void> _onRefresh() {
+    context
+        .read<HomeBloc>()
+        .add(HomeLoadDataEvent(search: searchController.text));
+    return Future.value(null);
+  }
 
-@override
+  @override
-Widget build(BuildContext context) {
+  Widget build(BuildContext context) {
     return Padding(
         padding: EdgeInsets.only(top: MediaQuery.of(context).padding.top),
         child: Column(
@@ -87,34 +108,49 @@ Widget build(BuildContext context) {
             Padding(
                 padding: const EdgeInsets.all(12),
                 child: CupertinoSearchTextField(
+                    controller: searchController,
                     onChanged: (search) {
-        setState(() {
+                      Debounce.run(() => context
-          data = repo.loadData(q:search);
+                          .read<HomeBloc>()
-        });
+                          .add(HomeLoadDataEvent(search: search)));
-      },
+                    })),
-    ),
+            BlocBuilder<HomeBloc, HomeState>(
-  ),
+                builder: (context, state) => state.isLoading
-   Expanded(child: Center(
+                    ? CircularProgressIndicator()
-    child: FutureBuilder<List<CardData>?>(
+                    : Expanded(
-      future: data,
+                        child: RefreshIndicator(
-      builder: (context, snapshot) =>
+                          onRefresh: _onRefresh,
-          SingleChildScrollView(
+                          child: ListView.builder(
-            child: snapshot.hasData ? Column(
+                              controller: scrollController,
-              mainAxisAlignment: MainAxisAlignment.center,
+                              padding: EdgeInsets.zero,
-              children: snapshot.data!.map((data) {
+                              itemCount: state.data?.data?.length ?? 0,
-                return _Card.fromData(data,
+                              itemBuilder: (context, index) {
-                  onLike: (String title, bool isLiked) =>
+                                final data = state.data?.data?[index];
-                      _showSnackbar(context, title, isLiked),
+                                return data != null
-                  onTap: () => _navToDetails(context, data),);
+                                    ? _Card.fromData(
-              }).toList() ?? [],
+                                        data,
+                                        onLike: (title, isLiked) =>
+                                            _showSnackbar(
+                                                context, title, isLiked),
+                                        onTap: () =>
+                                            _navToDetails(context, data),
                                       )
-                : const CircularProgressIndicator(),
+                                    : const SizedBox.shrink();
+                              }),
                         ),
-    ),
+                      )),
-  ),
+            BlocBuilder<HomeBloc, HomeState>(
-  )
+                builder: (context, state) => state.isPaginationLoading
+                    ? const CircularProgressIndicator()
+                    : const SizedBox.shrink())
           ],
-
         ));
-}}
+  }
+}
 
+class HomeData {
+  final List<CardData>? data;
+  final int? nextPage;
+
+  HomeData({this.data, this.nextPage});
+}

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:
@@ -154,18 +162,18 @@ packages:
     dependency: transitive
     description:
       name: convert
-      sha256: "0f08b14755d163f6e2134cb58222dd25ea2a2ee8a195e53983d57c075324d592"
+      sha256: b30acd5944035672bc15c6b7a8b47d773e41e2f17de064350988c5d02adb1c68
       url: "https://pub.dev"
     source: hosted
-    version: "3.1.1"
+    version: "3.1.2"
   crypto:
     dependency: transitive
     description:
       name: crypto
-      sha256: ec30d999af904f33454ba22ed9a86162b35e52b44ac4807d1d93c288041d7d27
+      sha256: "1e445881f28f22d6140f181e07737b22f1e099a5e1ff94b0af2f9e4a463f4855"
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.5"
+    version: "3.0.6"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -198,6 +206,14 @@ 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:
@@ -218,15 +234,23 @@ packages:
     dependency: transitive
     description:
       name: fixnum
-      sha256: "25517a4deb0c03aa0f32fd12db525856438902d9c16536311e76cdc57b31d7d1"
+      sha256: b6dc7065e46c974bc7c5f143080a6764ec7a4be6da1285ececdc37be96de53be
       url: "https://pub.dev"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   flutter:
     dependency: "direct main"
     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 +416,14 @@ 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 +456,14 @@ 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

@@ -15,6 +15,10 @@ dependencies:
   json_annotation: ^4.8.1
   dio: ^5.4.2+1
   pretty_dio_logger: ^1.3.1
+
+  equatable: ^2.0.5
+  flutter_bloc: ^8.1.5
+
 dev_dependencies:
   flutter_test:
     sdk: flutter

test/widget_test.dart

@@ -8,7 +8,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-import 'package:pmu_labs/main.dart';
+import 'package:flutter_app/main.dart';
 
 void main() {
   testWidgets('Counter increments smoke test', (WidgetTester tester) async {