observable_state_lifecycle 0.4.0

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observable_state_lifecycle #

Make Flutter StatefulWidget's lifecycle observable.

Getting Started #

When creating your StatefulWidget, add a mixin from this library:

// A Widget named Test

import 'package:observable_state_lifecycle/observable_state_lifecycle.dart';

class _TestState extends State<Test> with ObservableStateLifecycle<Test> {


Then you can call addLifecycleObserver in your state:

class _TestState extends State<Test> with ObservableStateLifecycle<Test> {
  _TestState() {
      if(phase == StateLifecyclePhase.initState) {
          n = 2;

    int n = 1;

[0.0.1] #

  • Initial commit

[0.0.2] #

  • Fix didUpdateWidget

[0.1.0] #

  • StateLifecycleSubject -> LifecycleSubject
  • StateLifecycleSubject() -> LifecycleSubject.create()

[0.2.0] #

  • Callback instead of object

[0.3.0] #

  • Remove state param from observer

[0.3.1] #

  • Add ObserveState and ObserveEffect

[0.4.0] #

  • Extract ObserveState and ObserveEffect into package active_observers

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  observable_state_lifecycle: ^0.4.0

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:observable_state_lifecycle/observable_state_lifecycle.dart';
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Learn more about scoring.

We analyzed this package on Jul 2, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.8.4
  • pana: 0.13.9+1
  • Flutter: 1.17.3

Analysis suggestions

Package not compatible with SDK dart

because of import path [observable_state_lifecycle]

Health suggestions

Fix lib/observable_state_lifecycle.dart. (-0.50 points)

Analysis of lib/observable_state_lifecycle.dart reported 1 hint:

line 87 col 7: Set literals weren't supported until version 2.2, but this code is required to be able to run on earlier versions.

Maintenance suggestions

Package is getting outdated. (-32.05 points)

The package was last published 68 weeks ago.

Maintain an example. (-10 points)

Create a short demo in the example/ directory to show how to use this package.

Common filename patterns include main.dart, example.dart, and observable_state_lifecycle.dart. Packages with multiple examples should provide example/README.md.

For more information see the pub package layout conventions.

The package description is too short. (-9 points)

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.12 1.14.13
meta 1.1.8 1.2.0
sky_engine 0.0.99
typed_data 1.1.6 1.2.0
vector_math 2.0.8
Dev dependencies