Book Image

Managing State in Flutter Pragmatically

By : RAHUL AGARWAL, Waleed Arshad
Book Image

Managing State in Flutter Pragmatically

By: RAHUL AGARWAL, Waleed Arshad

Overview of this book

Flutter is a cross-platform user interface (UI) toolkit that enables developers to create beautiful native applications for mobile, desktop, and the web with a single codebase. State management in Flutter is one of the most crucial and complex topics within Flutter, with a wide array of approaches available that can make it easy to get lost due to information overload. Managing State in Flutter Pragmatically is a definitive guide to starting out with Flutter and learning about state management, helping developers with some experience of state management to choose the most appropriate solutions and techniques to use. The book takes a hands-on approach and begins by covering the basics of Flutter state management before exploring how to build and manipulate a shopping cart app using popular approaches such as BLoC/Cubit, Provider, MobX, and Riverpod. Throughout the book, you'll also learn how to adopt approaches from React such as Redux and all its types. By the end of this Flutter book, you'll have gained a holistic view of all the state management approaches in Flutter, and learned which approach is the best solution for managing state in your app development journey.
Table of Contents (14 chapters)
1
Section 1:The Basics of State Management
4
Section 2:Types, Techniques, and Approaches
8
Section 3:Code-Level Implementation

Creating a cart app with GetX

We will be reusing the same screens we created in the previous chapters, with some editions specific to GetX. Let's begin by creating our cart application using GetX:

  1. Create a new Flutter app named cart_getx and add dependencies for GetX from pub.dev.
  2. Copy the item.dart file from the previous chapter's code into the lib folder of your cart_getx app. Make sure to add the dependency for the equatable package from pub.dev.
  3. Create a new file named cart_controller.dart and add the following class:
    class Cart {
      List<Item> items = populateItems();
      List<Item> cart = [];
      Cart({required this.cart});
    }

    This is a very simple, self-explanatory class that holds our static item list and an initially empty cart.

    Don't forget to add the following import in order to make the Item class work:

    import 'item.dart';
  4. In the same cart_controller.dart file, underneath the Cart class, add the...