A Flutter package for creating customizable selector wheel widgets

26 April 2023
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Selector Wheel

A Flutter package for creating customizable selector wheel widgets.

Features

Customizable selector wheel widget
Supports variable wheel size, item width, item height, and more
Built with Flutter’s best practices for optimal performance
Supports haptic feedback, fade-out effect, and more
Can be used with any data type

Getting started

Add selector_wheel to your pubspec.yaml by running the following command:

flutter pub add selector_wheel

Usage

Import the package:

import 'package:selector_wheel/selector_wheel.dart';

Basic usage

Use the SelectorWheel widget in your app:

SizedBox(
  width: 200,
  height: 200,
  child: SelectorWheel(
    childCount: 10,
    // convertIndexToValue is a function that converts the index of the
    // child to a value that is displayed on the selector wheel. In this
    // case, we are converting the index to a string. I.e we'll have
    // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 on the selector wheel.
    convertIndexToValue: (int index) {
      return SelectorWheelValue(
        label: index.toString(),
        value: index,
        index: index,
      );
    },
    onValueChanged: (SelectorWheelValue<int> value) {
      // print the value that was selected
      print(value);
    },
  ),
)

Customizing the selector wheel

Keep in mind, that the convertIndexToValue function can be used to convert the index to any value. In the example below, we are converting the index to a double value to represent quarter lbs.

SizedBox(
  width: 200,
  height: 200,
  child: SelectorWheel(
    childCount: 10,
    convertIndexToValue: (int index) {
      // This is just to illustrate, that the index can be converted
      // to any value. In this case, we are converting the index to
      // a quarter of a pound.
      final quarter = index / 4;

      return SelectorWheelValue(
        // The label is what is displayed on the selector wheel
        label: '${quarter.toString()} lb',
        value: quarter,
        index: index,
      );
    },
    onValueChanged: (SelectorWheelValue<double> value) {
      // print the value that was selected
      print(value);
    },
  ),
)

The colors of the selector wheel can be customized by overriding the ThemeData in the following way:

// Overriding the colors of the selector wheel
Theme(
  data: ThemeData(
    textTheme: Theme.of(context).textTheme.copyWith(
      titleLarge: Theme.of(context).textTheme.titleLarge?.copyWith(
        fontSize: 24.0,
        fontWeight: FontWeight.w600,
      ),
    ),
    colorScheme: Theme.of(context).colorScheme.copyWith(
      surface: Colors.black,
      onSurface: Colors.white,
      secondaryContainer: Colors.amber,
    ),
  ),
  child: SizedBox(
    width: 200,
    height: 200,
    child: SelectorWheel(
      childCount: 10,
      highlightBorderRadius: 16.0,
      highlightHeight: 40.0,
      highlightWidth: 100.0,
      convertIndexToValue: (int index) {
        return SelectorWheelValue(
          label: index.toString(),
          value: index,
          index: index,
        );
      },
      onValueChanged: (value) {
        // print the value that was selected
        print(value);
      },
    ),
  ),
)

Notice, that we’re also customizing the “highlighted” item’s border radius, height, and width. To see all the customizable properties, check out the SelectorWheel class.