When I first started learning state management in Flutter, it honestly felt like magic. I'd change one variable, call setState , and the screen would just… update. Later I met ValueNotifier and ValueListenableBuilder , and it got even stranger — now only one widget would rebuild while everything around it stayed perfectly still. I hadn't written any code to watch for changes. I hadn't wired anything up. It just worked. And anything that "just works" without me understanding why makes me a little uncomfortable. So I did what any curious developer does: I went down the rabbit hole. I wanted to know how a value "knows" when to tell the UI to rebuild. Who is listening? How does the change travel from my variable to the pixels on screen? That question led me to something much bigger than Flutter — a classic software design pattern called the Observer pattern . Once I understood it, the magic didn't disappear. It just turned into some...
In this blog post, we'll explore efficient state management in Flutter applications using ValueNotifier and EfficientBuilder within the MVVM (Model-View-ViewModel) architectural pattern. The MVVM architecture consists of three key components: Model: Represents the data and business logic View: Handles the UI presentation ViewModel: Manages state and business logic between Model and View In our approach, we’ll be refining the ViewModel by separating its states into a dedicated State class. This ensures that the ViewModel focuses solely on managing logic while the State class handles state representation. Traditionally, in MVVM, the ViewModel is responsible for both state management and business logic. However, by decoupling these concerns, we create a more structured and maintainable architecture. No more talking. Lets, implement it together. 1. Efficient Builder: We are going to use Efficient Builder package for this. So, go to pub.dev. Add the package to you pubspec.yaml file...