migrate new null safety version

lib/bloc/weather_bloc.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 
 import 'package:bloc/bloc.dart';
+import 'package:equatable/equatable.dart';
 import 'package:flutter_cubit_bloc_tutorial/data/model/weather.dart';
 import 'package:flutter_cubit_bloc_tutorial/data/weather_repository.dart';
 import 'package:meta/meta.dart';

lib/bloc/weather_event.dart

@@ -1,10 +1,13 @@
 part of 'weather_bloc.dart';
 
 @immutable
-abstract class WeatherEvent {}
+abstract class WeatherEvent extends Equatable {}
 
 class GetWeather extends WeatherEvent {
   final String cityName;
 
   GetWeather(this.cityName);
+
+  @override
+  List<Object?> get props => [cityName];
 }

lib/bloc/weather_state.dart

@@ -1,44 +1,36 @@
 part of 'weather_bloc.dart';
 
 @immutable
-abstract class WeatherState {
+abstract class WeatherState extends Equatable {
   const WeatherState();
 }
 
 class WeatherInitial extends WeatherState {
   const WeatherInitial();
+
+  @override
+  List<Object?> get props => [];
 }
 
 class WeatherLoading extends WeatherState {
   const WeatherLoading();
+
+  @override
+  List<Object?> get props => [];
 }
 
 class WeatherLoaded extends WeatherState {
   final Weather weather;
   const WeatherLoaded(this.weather);
 
   @override
-  bool operator ==(Object o) {
-    if (identical(this, o)) return true;
-
-    return o is WeatherLoaded && o.weather == weather;
-  }
-
-  @override
-  int get hashCode => weather.hashCode;
+  List<Object?> get props => [weather];
 }
 
 class WeatherError extends WeatherState {
   final String message;
   const WeatherError(this.message);
 
   @override
-  bool operator ==(Object o) {
-    if (identical(this, o)) return true;
-
-    return o is WeatherError && o.message == message;
-  }
-
-  @override
-  int get hashCode => message.hashCode;
+  List<Object?> get props => [message];
 }

lib/cubit/weather_cubit.dart

@@ -1,4 +1,5 @@
 import 'package:bloc/bloc.dart';
+import 'package:equatable/equatable.dart';
 import 'package:flutter_cubit_bloc_tutorial/data/model/weather.dart';
 import 'package:flutter_cubit_bloc_tutorial/data/weather_repository.dart';
 import 'package:meta/meta.dart';

lib/cubit/weather_state.dart

@@ -1,44 +1,36 @@
 part of 'weather_cubit.dart';
 
 @immutable
-abstract class WeatherState {
+abstract class WeatherState extends Equatable {
   const WeatherState();
 }
 
 class WeatherInitial extends WeatherState {
   const WeatherInitial();
+
+  @override
+  List<Object?> get props => [];
 }
 
 class WeatherLoading extends WeatherState {
   const WeatherLoading();
+
+  @override
+  List<Object?> get props => [];
 }
 
 class WeatherLoaded extends WeatherState {
   final Weather weather;
   const WeatherLoaded(this.weather);
 
   @override
-  bool operator ==(Object o) {
-    if (identical(this, o)) return true;
-
-    return o is WeatherLoaded && o.weather == weather;
-  }
-
-  @override
-  int get hashCode => weather.hashCode;
+  List<Object?> get props => [weather];
 }
 
 class WeatherError extends WeatherState {
   final String message;
   const WeatherError(this.message);
 
   @override
-  bool operator ==(Object o) {
-    if (identical(this, o)) return true;
-
-    return o is WeatherError && o.message == message;
-  }
-
-  @override
-  int get hashCode => message.hashCode;
+  List<Object?> get props => [message];
 }

lib/data/model/weather.dart

@@ -1,23 +1,14 @@
-import 'package:meta/meta.dart';
+import 'package:equatable/equatable.dart';
 
-class Weather {
+class Weather extends Equatable {
   final String cityName;
   final double temperatureCelsius;
 
   Weather({
-    @required this.cityName,
-    @required this.temperatureCelsius,
+    required this.cityName,
+    required this.temperatureCelsius,
   });
 
   @override
-  bool operator ==(Object o) {
-    if (identical(this, o)) return true;
-
-    return o is Weather &&
-        o.cityName == cityName &&
-        o.temperatureCelsius == temperatureCelsius;
-  }
-
-  @override
-  int get hashCode => cityName.hashCode ^ temperatureCelsius.hashCode;
+  List<Object?> get props => [cityName, temperatureCelsius];
 }

lib/main.dart

@@ -1,8 +1,6 @@
-import 'package:bloc/bloc.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_cubit_bloc_tutorial/bloc/weather_bloc.dart';
-import 'package:flutter_cubit_bloc_tutorial/cubit/weather_cubit.dart';
 import 'package:flutter_cubit_bloc_tutorial/data/weather_repository.dart';
 import 'package:flutter_cubit_bloc_tutorial/pages/weather_search_page.dart';
 

lib/pages/weather_search_page.dart

@@ -21,7 +21,7 @@ class _WeatherSearchPageState extends State<WeatherSearchPage> {
         child: BlocConsumer<WeatherBloc, WeatherState>(
           listener: (context, state) {
             if (state is WeatherError) {
-              Scaffold.of(context).showSnackBar(
+              ScaffoldMessenger.of(context).showSnackBar(
                 SnackBar(
                   content: Text(state.message),
                 ),
@@ -97,7 +97,7 @@ class CityInputField extends StatelessWidget {
   }
 
   void submitCityName(BuildContext context, String cityName) {
-    final weatherBloc = context.bloc<WeatherBloc>();
+    final weatherBloc = context.read<WeatherBloc>();
     weatherBloc.add(GetWeather(cityName));
   }
 }