class_builder 1.0.1

class_builder #

util for string based class initialization

Getting Started #

register class #

ClassBuilder.register<ClassBuilderTest>(() => ClassBuilderTest());

instantiate from string #

var instance = ClassBuilder.fromString('ClassBuilderTest');

check type #

TypeMatcher<ClassBuilderTest>().check(instance) // true

[0.0.1] - TODO: Add release date.

  • TODO: Describe initial release.


import 'package:class_builder/class_builder.dart';
import 'package:flutter/material.dart';

class HomePage extends StatelessWidget {
  Widget build(BuildContext context) {
    return Container();

class SettingPage extends StatelessWidget {
  Widget build(BuildContext context) {
    return Container(
      child: Text('Settings page'),

class Main extends StatefulWidget {
  _MainState createState() => _MainState();

class _MainState extends State<Main> {
  var _className;

  void initState() {
    _className = 'HomePage'; // or get it from backend

    ClassBuilder.register<HomePage>(() => HomePage());
    ClassBuilder.register<SettingPage>(() => SettingPage());

  Widget build(BuildContext context) {
    return Container(
      child: ClassBuilder.fromString(_className),

Use this package as a library

1. Depend on it

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

  class_builder: ^1.0.1

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:class_builder/class_builder.dart';
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Learn more about scoring.

We analyzed this package on Feb 21, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.5
  • Flutter: 1.12.13+hotfix.7

Health issues and suggestions

Document public APIs. (-1 points)

6 out of 6 API elements have no dartdoc comment.Providing good documentation for libraries, classes, functions, and other API elements improves code readability and helps developers find and use your API.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.8
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies