FluxState by Rudradeep is a revolutionary, simple, and powerful state management library for Flutter. It combines the best features of existing solutions into a unified package.

Overview

FluxState provides reactive state management with advanced persistence, dependency injection, navigation, and debugging tools.

Key Features

• Reactive State: Flux<T> for reactive state management.
• Computed States: Derive values with computed().
• Dependency Injection: Global and scoped DI with FluxState.
• Advanced Persistence: FluxPersist with caching, batching, encryption, file storage, and versioning.
• Navigation: Simple navigation with FluxNavigator.
• Debugging: State history and revert functionality.
• Lifecycle Callbacks: onInit and onDispose hooks.

Installation

Add to your pubspec.yaml:

dependencies:
  fluxstate: ^1.3.0

Run:

flutter pub get

Usage

1. Basic State Management

import 'package:fluxstate/fluxstate.dart';
void main() async {
  final counter = Flux<int>(0, onInit: () => print("Counter initialized")).obs;
  counter.value = 1;
}

2. UI Integration

import 'package:fluxstate/fluxstate.dart';
void main() async {
FluxBuilder(
  state: counter,
  builder: (context, value) => Text('Count: $value'),
);}

3. Computed States

final doubled = counter.computed((val) => val * 2);

4. Functional Updates

void main() async {
counter.update((val) => val + 1);}

5. Dependency Injection

void main() async {
FluxState.inject(MyService());
final service = FluxState.find<MyService>();
FluxState.injectScoped(MyService(), "feature1");
final scopedService = FluxState.findScoped<MyService>("feature1");}

6. Advanced Persistence

Initialize Encryption

void main() async {
FluxPersist.initEncryption("my_secure_key_32_bytes_long");}

Save with Options

void main() async {
FluxPersist.save(
  counter,
  "counter",
  cache: true,
  encrypt: true,
  batch: true,
);}

Load with Cache

void main() async {
FluxPersist.load(
  counter,
  "counter",
  defaultValue: 0,
  useCache: true,
  decrypt: true,
);}

File Persistence

void main() async {
FluxPersist.saveToFile(counter, "counter_backup");
FluxPersist.loadFromFile(counter, "counter_backup", defaultValue: 0);}

Custom Type with Encryption

class User {
  final String name;
  final int age;
  User(this.name, this.age);
  String toJson() => jsonEncode({'name': name, 'age': age});
  static User fromJson(String json) => User(jsonDecode(json)['name'], jsonDecode(json)['age']);
}
void main() async {
final user = Flux<User>(User("Guest", 0));
FluxPersist.save(user, "user", toJson: (u) => u.toJson(), encrypt: true);
FluxPersist.load(user, "user", fromJson: User.fromJson, defaultValue: User("Guest", 0), decrypt: true);}

7. Navigation

void main() async {
FluxNavigator.to(context, SecondPage());
FluxNavigator.back(context);
FluxNavigator.replace(context, SecondPage());}

8. Debugging

void main() async {
final flux = Flux<int>(0);
flux.value = 1;
flux.value = 2;
print(flux.history); // [0, 1, 2]
flux.revert(1);
}

9. Lifecycle Management

void main() async {
  final flux = Flux<int>(
    0,
    onInit: () => print("Initialized"),
    onDispose: () => print("Disposed"),
  );
  flux.dispose();
}

Example Application

See example/lib/main.dart.

API Reference

Flux

• Constructor: Flux(T initialValue, {VoidCallback? onInit, VoidCallback? onDispose})
• Properties: value, stream, history
• Methods: update, computed, revert, dispose

FluxBuilder

• Constructor: FluxBuilder({required Flux<T> state, required Widget Function(BuildContext, T) builder})

FluxState

• Methods: inject, injectScoped, find, findScoped, clearScope

FluxPersist

• Methods: initEncryption, save, load, saveToFile, loadFromFile

FluxNavigator

• Methods: to, replace, back

Error Handling

• Disposed Flux: Throws StateError.
• Persistence: Throws UnsupportedError for unsupported types without serialization.
• DI: Throws Exception for missing services.