flutter_knob 0.0.2

knob #

A simple knob UI widget.

Getting Started #

Add the dependency to your pubspec.yaml:

    sdk: flutter
  flutter_knob: // Add it here

This package provides a Knob widget with a similar API as Flutter's Slider widget.

Working example, showing the Knob controlling, and being controlled by a Slider:

import 'package:flutter/material.dart';

import 'package:flutter_knob/flutter_knob.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),

class MyHomePage extends StatefulWidget {
  _MyHomePageState createState() => _MyHomePageState();

class _MyHomePageState extends State<MyHomePage> {
  double _value = 0.0;
  void _setValue(double value) => setState(() => _value = value);
  static const double minValue = 0;
  static const double maxValue = 10;

  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Tutorial'),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
              value: _value,
              color: Colors.blue,
              onChanged: _setValue,
              min: minValue,
              max: maxValue,
              size: 50
                value: _value,
                onChanged: _setValue,
                min: minValue,
                max: maxValue),
              'Value: ${_value.toStringAsFixed(3)}',

[0.0.1] - 10/08/2019

A very basic knob for use in Flutter, with a similar interfce to the Slider widget

[0.0.2] - 19/08/2019

Fixed bug in which gesture detector was inside rotation widget, so gesture direction got rotated

Use this package as a library

1. Depend on it

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

  flutter_knob: ^0.0.2

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:flutter_knob/flutter_knob.dart';
Describes how popular the package is relative to other packages. [more]
Code health derived from static analysis. [more]
Reflects how tidy and up-to-date the package is. [more]
Weighted score of the above. [more]
Learn more about scoring.

We analyzed this package on Feb 25, 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 suggestions

Format lib/flutter_knob.dart.

Run flutter format to format lib/flutter_knob.dart.

Maintenance suggestions

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 flutter_knob.dart. Packages with multiple examples should provide example/README.md.

For more information see the pub package layout conventions.

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the 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