исправления

lib/data/mappers/cats_mapper.dart

@@ -5,7 +5,7 @@ import '../../domain/models/home.dart';
 const _imagePlaceholder =
     'https://upload.wikimedia.org/wikipedia/en/archive/b/b1/20210811082420%21Portrait_placeholder.png';
 
-extension CharactersDtoToModel on CatsDto {
+extension CatsDtoToModel on CatsDto {
   HomeData toDomain() => HomeData(
     data: data?.map((e) => e.toDomain()).toList(),
   );

lib/data/repositories/cats_repository.dart

@@ -21,19 +21,18 @@ class CatsRepository extends ApiInterface {
   Future<HomeData?> loadData({
     OnErrorCallback? onError,
     String? q,
-    int page = 1,
+    int offset = 0,
     int pageSize = 20,
   }) async {
     try {
       const String url = '/v1/cats?min_weight=1';
 
-      final int offset = (page - 1) * pageSize;
-
       final Response<dynamic> response = await _dio.get<dynamic>(
         url,
         queryParameters: {
           'name': q,
           'offset': offset,
+          'limit': pageSize,
         },
       );
 

lib/domain/models/home.dart

@@ -2,7 +2,7 @@ import 'card.dart';
 
 class HomeData {
   final List<CardData>? data;
-  final int? nextPage;
+  final int? offset;
 
-  HomeData({this.data, this.nextPage});
+  HomeData({this.data, this.offset});
 }

lib/presentation/home_page/bloc/bloc.dart

@@ -11,7 +11,7 @@ class HomeBloc extends Bloc<HomeEvent, HomeState> {
   }
 
   Future<void> _onLoadData(HomeLoadDataEvent event, Emitter<HomeState> emit) async {
-    if (event.nextPage == null) {
+    if (event.offset == 0) {
       emit(state.copyWith(isLoading: true));
     } else {
       emit(state.copyWith(isPaginationLoading: true));
@@ -21,19 +21,27 @@ class HomeBloc extends Bloc<HomeEvent, HomeState> {
 
     final data = await repo.loadData(
       q: event.search,
-      page: event.nextPage ?? 1,
       onError: (e) => error = e,
+      offset: event.offset,
     );
 
-    if (event.nextPage != null) {
-      data?.data?.insertAll(0, state.data?.data ?? []);
-    }
+    if (data != null) {
+      final updatedData = (event.offset == 0
+          ? data.data
+          : [...state.data?.data ?? [], ...data.data ?? []]);
 
-    emit(state.copyWith(
-      isLoading: false,
-      isPaginationLoading: false,
-      data: data,
-      error: error,
-    ));
+      emit(state.copyWith(
+        isLoading: false,
+        isPaginationLoading: false,
+        data: HomeData(data: updatedData),
+        error: error,
+      ));
+    } else {
+      emit(state.copyWith(
+        isLoading: false,
+        isPaginationLoading: false,
+        error: error,
+      ));
+    }
   }
 }

lib/presentation/home_page/bloc/events.dart

@@ -4,7 +4,7 @@ abstract class HomeEvent {
 
 class HomeLoadDataEvent extends HomeEvent {
   final String? search;
-  final int? nextPage;
+  final int offset;
 
-  const HomeLoadDataEvent({this.search, this.nextPage});
+  const HomeLoadDataEvent({this.search, this.offset = 0});
 }

lib/presentation/home_page/bloc/state.dart

@@ -7,12 +7,14 @@ part 'state.g.dart';
 @CopyWith()
 class HomeState extends Equatable {
   final HomeData? data;
+  final int offset;
   final bool isLoading;
   final bool isPaginationLoading;
   final String? error;
 
   const HomeState({
     this.data,
+    this.offset = 0,
     this.isLoading = false,
     this.isPaginationLoading = false,
     this.error,
@@ -21,6 +23,7 @@ class HomeState extends Equatable {
   @override
   List<Object?> get props => [
     data,
+    offset,
     isLoading,
     isPaginationLoading,
     error,

lib/presentation/home_page/bloc/state.g.dart

@@ -9,6 +9,8 @@ part of 'state.dart';
 abstract class _$HomeStateCWProxy {
   HomeState data(HomeData? data);
 
+  HomeState offset(int offset);
+
   HomeState isLoading(bool isLoading);
 
   HomeState isPaginationLoading(bool isPaginationLoading);
@@ -23,6 +25,7 @@ abstract class _$HomeStateCWProxy {
   /// ````
   HomeState call({
     HomeData? data,
+    int? offset,
     bool? isLoading,
     bool? isPaginationLoading,
     String? error,
@@ -38,6 +41,9 @@ class _$HomeStateCWProxyImpl implements _$HomeStateCWProxy {
   @override
   HomeState data(HomeData? data) => this(data: data);
 
+  @override
+  HomeState offset(int offset) => this(offset: offset);
+
   @override
   HomeState isLoading(bool isLoading) => this(isLoading: isLoading);
 
@@ -58,6 +64,7 @@ class _$HomeStateCWProxyImpl implements _$HomeStateCWProxy {
   /// ````
   HomeState call({
     Object? data = const $CopyWithPlaceholder(),
+    Object? offset = const $CopyWithPlaceholder(),
     Object? isLoading = const $CopyWithPlaceholder(),
     Object? isPaginationLoading = const $CopyWithPlaceholder(),
     Object? error = const $CopyWithPlaceholder(),
@@ -67,6 +74,10 @@ class _$HomeStateCWProxyImpl implements _$HomeStateCWProxy {
           ? _value.data
           // ignore: cast_nullable_to_non_nullable
           : data as HomeData?,
+      offset: offset == const $CopyWithPlaceholder() || offset == null
+          ? _value.offset
+          // ignore: cast_nullable_to_non_nullable
+          : offset as int,
       isLoading: isLoading == const $CopyWithPlaceholder() || isLoading == null
           ? _value.isLoading
           // ignore: cast_nullable_to_non_nullable

lib/presentation/home_page/home_page.dart

@@ -37,31 +37,20 @@ class Body extends StatefulWidget {
   State<Body> createState() => BodyState();
 }
 
-class BodyState extends State<Body> {
-  final searchController = TextEditingController();
-  final scrollController = ScrollController();
-
-  @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,
-        ));
-      }
+void _onNextPageListener() {
+  if (scrollController.offset >= scrollController.position.maxScrollExtent &&
+      !scrollController.position.outOfRange) {
+    final bloc = context.read<HomeBloc>();
+    if (!bloc.state.isPaginationLoading) {
+      final currentOffset = bloc.state.offset;
+      final nextOffset = currentOffset + 20; // 20 - размер страницы
+      bloc.add(HomeLoadDataEvent(
+        search: searchController.text,
+        offset: nextOffset,
+      ));
     }
   }
+}
 
   @override
   void dispose() {