lab6 part 2 end

lib/data/dtos/characters_dto.dart

@@ -6,7 +6,8 @@ part 'characters_dto.g.dart';
 @JsonSerializable(createToJson: false)
 class CharactersDto{
   final List<CharactersDataDto>? data;
-  const CharactersDto({this.data});
+  final MetaDto? meta;
+  const CharactersDto({this.data, this.meta});
   factory CharactersDto.fromJson(Map<String, dynamic> json) => _$CharactersDtoFromJson(json);
 }
 
@@ -29,3 +30,23 @@ class CharasterAttributesDataDto{
   const CharasterAttributesDataDto({this.name, this.born, this.died, this.image});
   factory CharasterAttributesDataDto.fromJson(Map<String, dynamic> json) => _$CharasterAttributesDataDtoFromJson(json);
 }
+
+@JsonSerializable(createToJson: false)
+class MetaDto {
+  final PaginationDto? pagination;
+
+  const MetaDto({this.pagination});
+
+  factory MetaDto.fromJson(Map<String, dynamic> json) => _$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);
+}

lib/data/dtos/characters_dto.g.dart

@@ -11,6 +11,9 @@ CharactersDto _$CharactersDtoFromJson(Map<String, dynamic> json) =>
       data: (json['data'] as List<dynamic>?)
           ?.map((e) => CharactersDataDto.fromJson(e as Map<String, dynamic>))
           .toList(),
+      meta: json['meta'] == null
+          ? null
+          : MetaDto.fromJson(json['meta'] as Map<String, dynamic>),
     );
 
 CharactersDataDto _$CharactersDataDtoFromJson(Map<String, dynamic> json) =>
@@ -31,3 +34,16 @@ CharasterAttributesDataDto _$CharasterAttributesDataDtoFromJson(
       died: json['died'] as String?,
       image: json['image'] as String?,
     );
+
+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(),
+    );

lib/data/mappes/characters_mapper.dart

@@ -1,5 +1,6 @@
 import 'package:pmd_lab/data/dtos/characters_dto.dart';
 import 'package:pmd_lab/domain/models/card.dart';
+import 'package:pmd_lab/domain/models/home.dart';
 
 
 const _imagePlaceholder = 'https://cdn-icons-png.flaticon.com/512/4054/4054617.png';
@@ -11,7 +12,6 @@ extension CharacterDataDtoToModel on CharactersDataDto {
     imgUrl: attributes?.image ?? _imagePlaceholder,
     description: _makeDescription(attributes?.born, attributes?.died),
   );
-
   String _makeDescription(String? born, String? died){
     return born != null && died != null
         ? '$born - $died'
@@ -22,3 +22,10 @@ extension CharacterDataDtoToModel on CharactersDataDto {
             : '';
   }
 }
+
+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 'card.dart';
+
+class HomeData {
+  final List<CardData>? data;
+  final int? nextPage;
+
+  HomeData({this.data, this.nextPage});
+}

lib/presentation/home_page/bloc/bloc.dart

@@ -11,13 +11,29 @@ class HomeBloc extends Bloc<HomeEvent, HomeState> {
   }
 
   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);
+    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

@@ -5,5 +5,7 @@ class HomeEvent {
 
 class HomeLoadDataEvent extends HomeEvent{
   final String? search;
-  const HomeLoadDataEvent({this.search});
+  final int? nextPage;
+  const HomeLoadDataEvent({this.search, this.nextPage});
+
 }

lib/presentation/home_page/bloc/state.dart

@@ -1,29 +1,43 @@
 import 'package:equatable/equatable.dart';
+import 'package:copy_with_extension/copy_with_extension.dart';
 import 'package:pmd_lab/domain/models/card.dart';
+import 'package:pmd_lab/domain/models/home.dart';
 
+part 'state.g.dart';
 
+@CopyWith()
 class HomeState extends Equatable {
-  final List<CardData>? data;
+  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({
-    List<CardData>? data,
+    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/bloc/state.g.dart

@@ -0,0 +1,92 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'state.dart';
+
+// **************************************************************************
+// CopyWithGenerator
+// **************************************************************************
+
+abstract class _$HomeStateCWProxy {
+  HomeState data(HomeData? data);
+
+  HomeState isLoading(bool isLoading);
+
+  HomeState isPaginationLoading(bool isPaginationLoading);
+
+  HomeState error(String? error);
+
+  /// This function **does support** nullification of nullable fields. All `null` values passed to `non-nullable` fields will be ignored. You can also use `HomeState(...).copyWith.fieldName(...)` to override fields one at a time with nullification support.
+  ///
+  /// Usage
+  /// ```dart
+  /// HomeState(...).copyWith(id: 12, name: "My name")
+  /// ````
+  HomeState call({
+    HomeData? data,
+    bool? isLoading,
+    bool? isPaginationLoading,
+    String? error,
+  });
+}
+
+/// Proxy class for `copyWith` functionality. This is a callable class and can be used as follows: `instanceOfHomeState.copyWith(...)`. Additionally contains functions for specific fields e.g. `instanceOfHomeState.copyWith.fieldName(...)`
+class _$HomeStateCWProxyImpl implements _$HomeStateCWProxy {
+  const _$HomeStateCWProxyImpl(this._value);
+
+  final HomeState _value;
+
+  @override
+  HomeState data(HomeData? data) => this(data: data);
+
+  @override
+  HomeState isLoading(bool isLoading) => this(isLoading: isLoading);
+
+  @override
+  HomeState isPaginationLoading(bool isPaginationLoading) =>
+      this(isPaginationLoading: isPaginationLoading);
+
+  @override
+  HomeState error(String? error) => this(error: error);
+
+  @override
+
+  /// This function **does support** nullification of nullable fields. All `null` values passed to `non-nullable` fields will be ignored. You can also use `HomeState(...).copyWith.fieldName(...)` to override fields one at a time with nullification support.
+  ///
+  /// Usage
+  /// ```dart
+  /// HomeState(...).copyWith(id: 12, name: "My name")
+  /// ````
+  HomeState call({
+    Object? data = const $CopyWithPlaceholder(),
+    Object? isLoading = const $CopyWithPlaceholder(),
+    Object? isPaginationLoading = const $CopyWithPlaceholder(),
+    Object? error = const $CopyWithPlaceholder(),
+  }) {
+    return HomeState(
+      data: data == const $CopyWithPlaceholder()
+          ? _value.data
+          // ignore: cast_nullable_to_non_nullable
+          : data as HomeData?,
+      isLoading: isLoading == const $CopyWithPlaceholder() || isLoading == null
+          ? _value.isLoading
+          // ignore: cast_nullable_to_non_nullable
+          : isLoading as bool,
+      isPaginationLoading:
+          isPaginationLoading == const $CopyWithPlaceholder() ||
+                  isPaginationLoading == null
+              ? _value.isPaginationLoading
+              // ignore: cast_nullable_to_non_nullable
+              : isPaginationLoading as bool,
+      error: error == const $CopyWithPlaceholder()
+          ? _value.error
+          // ignore: cast_nullable_to_non_nullable
+          : error as String?,
+    );
+  }
+}
+
+extension $HomeStateCopyWith on HomeState {
+  /// Returns a callable class that can be used as follows: `instanceOfHomeState.copyWith(...)` or like so:`instanceOfHomeState.copyWith.fieldName(...)`.
+  // ignore: library_private_types_in_public_api
+  _$HomeStateCWProxy get copyWith => _$HomeStateCWProxyImpl(this);
+}

lib/presentation/home_page/home_page.dart

@@ -79,21 +79,35 @@ class Body extends StatefulWidget {
 }
 
 class _BodyState extends State<Body> {
+  final searchController = TextEditingController();
+  final scrollController = ScrollController();
   final ApiInterface repo = PotterRepository();
-  late Future<List<CardData>?> data = repo.loadData(q: null);
+  late Future<List<CardData>?> data;
-  final TextEditingController 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();
   }
 
@@ -115,16 +129,21 @@ class _BodyState extends State<Body> {
           ),
 
           BlocBuilder<HomeBloc, HomeState>(
-            builder: (context, state) => state.isLoading
+            builder: (context, state) => state.error != null
+              ? Text(
+                  state.error ?? '',
+                  style: Theme.of(context).textTheme.headlineSmall?.copyWith(color: Colors.red),
+                )
+              : state.isLoading
                 ? const CircularProgressIndicator()
                 : Expanded(
                   child: RefreshIndicator(
                     onRefresh: _onRefresh,
                     child: ListView.builder(
                       padding: EdgeInsets.zero,
-                      itemCount: state.data?.length ?? 0,
+                      itemCount: state.data?.data?.length ?? 0,
                       itemBuilder: (context, index) {
-                        final data = state.data?[index];
+                        final data = state.data?.data?[index];
                         return data != null
                             ? _Card.fromData(
                           data,
@@ -137,7 +156,11 @@ class _BodyState extends State<Body> {
               ), // RefreshIndicator
             ), // Expanded
           ), // BlocBuilder
-
+          BlocBuilder<HomeBloc, HomeState>(
+            builder: (context, state) => state.isPaginationLoading
+                ? const CircularProgressIndicator()
+                : const SizedBox.shrink(),
+          )
         ],
       ),
     );

lib/repositories/api_interface.dart

@@ -1,5 +1,9 @@
-import 'package:pmd_lab/domain/models/card.dart';
+
+import 'package:pmd_lab/domain/models/home.dart';
+
+typedef OnErrorCallback = void Function(String? error);
 
 abstract class ApiInterface {
-  Future<List<CardData>?> loadData({String? q});
+  Future<HomeData?> loadData({OnErrorCallback? onError});
 }
+

lib/repositories/mock_repository.dart

@@ -1,28 +1,30 @@
+import 'package:pmd_lab/domain/models/home.dart';
 import 'package:pmd_lab/repositories/api_interface.dart';
 import 'package:pmd_lab/domain/models/card.dart';
 
 class MockRepository extends ApiInterface {
   @override
-  Future <List<CardData>?> loadData({String? q}) async {
+  Future <HomeData?> loadData({OnErrorCallback? onError}) async {
-  return [
+  return HomeData();
-    CardData(
+    // return [
-      'Какая-то новость',
+    // CardData(
-      description: 'В данном блоке рекомендуем разместить краткую информацию',
+    //   'Какая-то новость',
-      imgUrl:
+    //   description: 'В данном блоке рекомендуем разместить краткую информацию',
-      'https://universal.revengel.ru/assets/cache_image/images/services/3_731x487_1cb.png',
+    //   imgUrl:
-    ),
+    //   'https://universal.revengel.ru/assets/cache_image/images/services/3_731x487_1cb.png',
-    CardData(
+    // ),
-      'Ещё какая-то новость',
+    // CardData(
-      description: 'В данном блоке рекомендуем разместить краткую информацию',
+    //   'Ещё какая-то новость',
-      imgUrl:
+    //   description: 'В данном блоке рекомендуем разместить краткую информацию',
-      "https://universal.revengel.ru/assets/cache_image/images/services/2_731x487_1cb.png",
+    //   imgUrl:
-    ),
+    //   "https://universal.revengel.ru/assets/cache_image/images/services/2_731x487_1cb.png",
-    CardData(
+    // ),
-      'Ещё одна новость',
+    // CardData(
-      description: 'В данном блоке рекомендуем разместить краткую информацию',
+    //   'Ещё одна новость',
-      imgUrl:
+    //   description: 'В данном блоке рекомендуем разместить краткую информацию',
-      "https://universal.revengel.ru/assets/cache_image/images/services/1_731x487_1cb.png",
+    //   imgUrl:
-    )
+    //   "https://universal.revengel.ru/assets/cache_image/images/services/1_731x487_1cb.png",
-  ];
+    // )
+  //];
   }
 }

lib/repositories/potter_repository.dart

@@ -4,6 +4,7 @@ import 'package:dio/dio.dart';
 import 'package:pmd_lab/data/dtos/characters_dto.dart';
 import 'package:pmd_lab/data/mappes/characters_mapper.dart';
 import 'package:pmd_lab/domain/models/card.dart';
+import 'package:pmd_lab/domain/models/home.dart';
 import 'package:pmd_lab/repositories/api_interface.dart';
 import 'package:pretty_dio_logger/pretty_dio_logger.dart';
 
@@ -17,22 +18,30 @@ class PotterRepository extends ApiInterface{
   static const String _baseUrl = 'https://api.potterdb.com';
 
   @override
-  Future<List<CardData>?> loadData({String? q}) async {
+  Future<HomeData?> loadData({
-    try{
+    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,
+        queryParameters: {
+          'filter[name_cont]': q,
+          'page[number]': page,
+          'page[size]': pageSize,
+        },
       );
 
       final CharactersDto dto = CharactersDto.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) {
-    on DioException catch (e) {
+      onError?.call(e.error?.toString());
-      log("DioException: $e");
       return null;
     }
   }

pubspec.lock

@@ -166,6 +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:

pubspec.yaml

@@ -41,7 +41,7 @@ dependencies:
 
   equatable: ^2.0.5
   flutter_bloc: ^8.1.5
-
+  copy_with_extension_gen: ^5.0.4
 dev_dependencies:
   flutter_test:
     sdk: flutter