From 53ec56aaa2b77cc33cc08a213b4fa74ba65e5b35 Mon Sep 17 00:00:00 2001
From: fluttermiddlepodcast <fluttermiddlepodcast@gmail.com>
Date: Tue, 27 Jan 2026 13:56:29 +0300
Subject: [PATCH] added BlocObserver example

---
 lib/core/bloc/custom_bloc_observer.dart       | 48 +++++++++++++++++++
 .../profile/bloc/profile_bloc_event.dart      |  5 ++
 .../profile/bloc/profile_bloc_state.dart      | 15 ++++++
 lib/features/profile/model/profile.dart       |  5 ++
 lib/features/users/bloc/users_bloc_state.dart | 20 ++++++++
 lib/main.dart                                 |  2 +
 6 files changed, 95 insertions(+)
 create mode 100644 lib/core/bloc/custom_bloc_observer.dart

diff --git a/lib/core/bloc/custom_bloc_observer.dart b/lib/core/bloc/custom_bloc_observer.dart
new file mode 100644
index 0000000..2e69660
--- /dev/null
+++ b/lib/core/bloc/custom_bloc_observer.dart
@@ -0,0 +1,48 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+
+class CustomBlocObserver extends BlocObserver {
+  const CustomBlocObserver();
+
+  @override
+  void onCreate(BlocBase bloc) {
+    debugPrint('--- ${bloc.runtimeType} created');
+
+    super.onCreate(bloc);
+  }
+
+  @override
+  void onEvent(Bloc bloc, Object? event) {
+    debugPrint('--- ${bloc.runtimeType} received event: $event');
+
+    super.onEvent(bloc, event);
+  }
+
+  @override
+  void onChange(BlocBase bloc, Change change) {
+    debugPrint('--- ${bloc.runtimeType} changed state: $change');
+
+    super.onChange(bloc, change);
+  }
+
+  @override
+  void onTransition(Bloc bloc, Transition transition) {
+    debugPrint('--- ${bloc.runtimeType} moved to: $transition');
+
+    super.onTransition(bloc, transition);
+  }
+
+  @override
+  void onError(BlocBase bloc, Object error, StackTrace stackTrace) {
+    debugPrint('--- Error in ${bloc.runtimeType}: $error');
+
+    super.onError(bloc, error, stackTrace);
+  }
+
+  @override
+  void onClose(BlocBase bloc) {
+    debugPrint('--- ${bloc.runtimeType} closed');
+
+    super.onClose(bloc);
+  }
+}
diff --git a/lib/features/profile/bloc/profile_bloc_event.dart b/lib/features/profile/bloc/profile_bloc_event.dart
index 069d221..01711d7 100644
--- a/lib/features/profile/bloc/profile_bloc_event.dart
+++ b/lib/features/profile/bloc/profile_bloc_event.dart
@@ -6,6 +6,11 @@ class ProfileBlocEventFetch extends ProfileBlocEvent {
   ProfileBlocEventFetch({
     required this.isLogIn,
   });
+
+  @override
+  String toString() {
+    return 'ProfileBlocEventFetch{isLogIn: $isLogIn}';
+  }
 }
 
 class ProfileBlocEventLogIn extends ProfileBlocEvent {}
diff --git a/lib/features/profile/bloc/profile_bloc_state.dart b/lib/features/profile/bloc/profile_bloc_state.dart
index 943955d..2a34c99 100644
--- a/lib/features/profile/bloc/profile_bloc_state.dart
+++ b/lib/features/profile/bloc/profile_bloc_state.dart
@@ -9,6 +9,11 @@ class ProfileBlocStateLoading extends ProfileBlocState {
 
   @override
   int get hashCode => runtimeType.hashCode;
+
+  @override
+  String toString() {
+    return 'ProfileBlocStateLoading{}';
+  }
 }
 
 class ProfileBlocStateLoaded extends ProfileBlocState {
@@ -30,6 +35,11 @@ class ProfileBlocStateLoaded extends ProfileBlocState {
 
   @override
   int get hashCode => Object.hash(profile, isLoggedIn);
+
+  @override
+  String toString() {
+    return 'ProfileBlocStateLoaded{profile: $profile, isLoggedIn: $isLoggedIn}';
+  }
 }
 
 class ProfileBlocStateError extends ProfileBlocState {
@@ -46,4 +56,9 @@ class ProfileBlocStateError extends ProfileBlocState {
 
   @override
   int get hashCode => error.hashCode;
+
+  @override
+  String toString() {
+    return 'ProfileBlocStateError{error: $error}';
+  }
 }
diff --git a/lib/features/profile/model/profile.dart b/lib/features/profile/model/profile.dart
index c60236b..bd3f231 100644
--- a/lib/features/profile/model/profile.dart
+++ b/lib/features/profile/model/profile.dart
@@ -26,4 +26,9 @@ class Profile {
 
   @override
   int get hashCode => firstName.hashCode ^ lastName.hashCode;
+
+  @override
+  String toString() {
+    return 'Profile{firstName: $firstName, lastName: $lastName}';
+  }
 }
diff --git a/lib/features/users/bloc/users_bloc_state.dart b/lib/features/users/bloc/users_bloc_state.dart
index cd564a6..d7a97fe 100644
--- a/lib/features/users/bloc/users_bloc_state.dart
+++ b/lib/features/users/bloc/users_bloc_state.dart
@@ -12,6 +12,11 @@ sealed class UsersBlocState {
 
   @override
   int get hashCode => runtimeType.hashCode;
+
+  @override
+  String toString() {
+    return 'UsersBlocState{}';
+  }
 }
 
 class UsersBlocStateLoading extends UsersBlocState {
@@ -23,6 +28,11 @@ class UsersBlocStateLoading extends UsersBlocState {
 
   @override
   int get hashCode => runtimeType.hashCode;
+
+  @override
+  String toString() {
+    return 'UsersBlocStateLoading{}';
+  }
 }
 
 class UsersBlocStateLoaded extends UsersBlocState {
@@ -53,6 +63,11 @@ class UsersBlocStateLoaded extends UsersBlocState {
       page,
     );
   }
+
+  @override
+  String toString() {
+    return 'UsersBlocStateLoaded{users (count): ${users.length}, canLoadMore: $canLoadMore, page: $page}';
+  }
 }
 
 class UsersBlocStateError extends UsersBlocState {
@@ -69,4 +84,9 @@ class UsersBlocStateError extends UsersBlocState {
 
   @override
   int get hashCode => error.hashCode;
+
+  @override
+  String toString() {
+    return 'UsersBlocStateError{error: $error}';
+  }
 }
diff --git a/lib/main.dart b/lib/main.dart
index 432710e..a11b960 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -1,3 +1,4 @@
+import 'package:bloc_example/core/bloc/custom_bloc_observer.dart';
 import 'package:bloc_example/core/di/di.dart';
 import 'package:bloc_example/features/home/home_page.dart';
 import 'package:bloc_example/features/profile/bloc/profile_bloc.dart';
@@ -9,6 +10,7 @@ import 'package:path_provider/path_provider.dart';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
+  Bloc.observer = const CustomBlocObserver();
   HydratedBloc.storage = await HydratedStorage.build(
     storageDirectory: kIsWeb
         ? HydratedStorageDirectory.web