Building Basic Flutter App with BLoC Pattern

BLoC (Business Logic Component) is a popular architectural pattern in the Flutter community for building scalable and maintainable apps. It provides a clear separation of concerns between the user interface and business logic, making the codebase more organized and easy to understand.

In this article, we will walk through the implementation of a simple counter app using the BLoC pattern. The app has two buttons, one to increment the counter and another to decrement it.

Getting Started

To get started, we need to add the flutter_bloc package to our pubspec.yaml file. The package provides classes and utilities that make it easy to implement the BLoC pattern.

dependencies:
  flutter_bloc: ^8.0.0

Next, we will create three files: counter_event.dart, counter_state.dart, and counter_bloc.dart. These files will contain the events, states, and business logic of our counter app.

Events

counter_event.dart file contains the events that can be triggered in the app. In our case, we have two events: NumberIncreaseEvent and NumberDecreaseEvent. They represent the actions that the user can perform in the app.

class CounterEvents {}

class NumberIncreaseEvent extends CounterEvents {}

class…