Implement global states

[LeadcodeDev]

Context

When you develop your entire application in a single file, each of your variables is accessible from any consumer located in your code.

In the context of a growing application, it's a good idea to divide it up into several classes with a single responsibility, but we quickly find ourselves with a multitude of files and increasing difficulty in sharing our data.

The aim of Shared States is to simplify this sharing across your entire application.

Proposal

This contract requires us to define an initial state for our shared data, which may subsequently be altered.

abstract interface class GlobalState<T> {
  T state;
}

We implement the contract while defining our generic T and its state of the same type.

final class MyState implements GlobalState<int> {
  @override
  int state = 0;

  void increment() => state++;
  void decrement() => state--;
}

final class MyClass with InjectState {
  final myState = state.read<MyState>();
  myState.increment();

  print(myState.state); // print(1);
}