rotary_scrollbar #

Flutter implementation of a native-looking Wear OS circular scrollbar.

It can be wrapped around a PageView, ListView or any other scrollable view.

And it is able to control the view's ScrollController or PageController with rotary input, including haptic feedback for each rotary event.

Setup #

Wear OS (Android) #

This package depends on wearable_rotary, which requires adding the following to MainActivity.kt:

import android.view.MotionEvent
import com.samsung.wearable_rotary.WearableRotaryPlugin

class MainActivity : FlutterActivity() {
    override fun onGenericMotionEvent(event: MotionEvent?): Boolean {
        return when {
            WearableRotaryPlugin.onGenericMotionEvent(event) -> true
            else -> super.onGenericMotionEvent(event)
        }
    }
}

This package depends on vibration, which needs access to the VIBRATE permission, so make sure the following is added to AndroidManifest.xml

<uses-permission android:name="android.permission.VIBRATE"/>

Usage #

To use this plugin, add rotary_scrollbar as a dependency in your pubspec.yaml file.

dependencies:
  rotary_scrollbar: ^1.0.0

Then, import rotary_scrollbar in your Dart code.

// Import the package.
import 'package:rotary_scrollbar/rotary_scrollbar.dart';

ListView #

class WatchScreen extends StatefulWidget {
  const WatchScreen({super.key});

  @override
  State<WatchScreen> createState() => _WatchScreenState();
}

class _WatchScreenState extends State<WatchScreen> {
  final scrollController = ScrollController();

  @override
  void dispose() {
    scrollController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      body: RotaryScrollbar(
        controller: scrollController,
        child: ListView.builder(
          controller: scrollController,
          itemBuilder: (context, index) {
            return Padding(
              padding: const EdgeInsets.only(
                bottom: 10,
              ),
              child: Container(
                color: Colors.blue.withRed(((255 / 29) * index).toInt()),
                width: 50,
                height: 50,
                child: Center(child: Text('box $index')),
              ),
            );
          },
          itemCount: 30,
        ),
      ),
    );
  }
}

PageView #

class WatchScreen extends StatefulWidget {
  const WatchScreen({super.key});

  @override
  State<WatchScreen> createState() => _WatchScreenState();
}

class _WatchScreenState extends State<WatchScreen> {
  final pageController = PageController();

  @override
  void dispose() {
    pageController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      body: RotaryScrollbar(
        controller: pageController,
        child: PageView(
          scrollDirection: Axis.vertical,
          controller: pageController,
          children: const [
            Page1(),
            Page2(),
            Page3(),
          ],
        ),
      ),
    );
  }
}

Supported devices #

• Wear OS devices with rotary input and round screens (Galaxy Watch 4, Pixel Watch, etc.)