First draft of Onboarding page

lib/screens/onboarding/bloc/onboarding_bloc.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+
+import 'onboarding_event.dart';
+import 'onboarding_state.dart';
+
+class OnboardingBloc extends Bloc<OnboardingEvent, OnboardingState> {
+  OnboardingBloc() : super(OnboardingInitial());
+
+  int pageIndex = 0;
+
+  final pageController = PageController(initialPage: 0);
+
+  @override
+  Stream<OnboardingState> mapEventToState(
+      OnboardingEvent event,
+      ) async* {
+    if (event is PageChangedEvent) {
+      if (pageIndex == 2) {
+        yield NextScreenState();
+        return;
+      }
+      pageIndex += 1;
+
+      pageController.animateToPage(
+        pageIndex,
+        duration: Duration(milliseconds: 500),
+        curve: Curves.ease,
+      );
+
+      yield PageChangedState(counter: pageIndex);
+    } else if (event is PageSwipedEvent) {
+      pageIndex = event.index;
+      yield PageChangedState(counter: pageIndex);
+    }
+  }
+}

lib/screens/onboarding/bloc/onboarding_event.dart

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+//part of 'onboarding_bloc.dart';
+
+import 'package:flutter/material.dart';
+
+@immutable
+abstract class OnboardingEvent {}
+
+class PageChangedEvent extends OnboardingEvent {
+
+}
+
+class PageSwipedEvent extends OnboardingEvent {
+  final int index;
+
+  PageSwipedEvent({required this.index});
+}

lib/screens/onboarding/bloc/onboarding_state.dart

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+//part of 'onboarding_bloc.dart';
+
+import 'package:flutter/material.dart';
+
+@immutable
+abstract class OnboardingState {}
+
+class OnboardingInitial extends OnboardingState {}
+
+class PageChangedState extends OnboardingState {
+  final int counter;
+
+  PageChangedState({
+    required this.counter,
+  });
+}
+
+class NextScreenState extends OnboardingState {}