flutter_circular_slider

Build Status License: MIT Pub

A customizable circular slider for Flutter.

Getting Started

Installation

Add


flutter_circular_slider : ^lastest_version

to your pubspec.yaml, and run

flutter packages get

in your project's root directory.

Basic Usage

Create a new project with command

flutter create myapp

Edit lib/main.dart like this:

import 'package:flutter/material.dart';

import 'package:flutter_circular_slider/flutter_circular_slider.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        backgroundColor: Colors.blueGrey,
        body: Center(
          child: Container(child: DoubleCircularSlider(100, 0, 20)),
        ));
  }
}

There are two different options:

  • SingleCircularSlider: has only one handler and can be moved either dragging the handler or just by clicking on different parts of the slider.
  • DoubleCircularSlider: has two handlers and both have to be moved by dragging them.

Basic Slider

Constructor

ParameterDefaultDescription
divisionsThe number of sections in which the circle will be divided for selection.
init(Only for DoubleCircularSlider) The initial value in the selection. Has to be bigger than 0 and smaller than divisions.
end(Only for DoubleCircularSlider) The end value in the selection. Has to be bigger than 0 and smaller than divisions.
position(Only for SingleCircularSlider) The selection. Has to be bigger than 0 and smaller than divisions.
height220.0Height of the canvas where the slider is rendered.
width220.0Width of the canvas where the slider is rendered.
primarySectors0Number of sectors painted in the base circle. Painted in selectionColor.
secondarySectors0Number of secondary sectors painted in the base circle. Painted in baseColor.
childnullWidget that will be inserted in the center of the circular slider.
onSelectionChangevoid onSelectionChange(int init, int end, int laps)Triggered every time the user interacts with the slider and changes the init and end values, and also laps.
onSelectionEndvoid onSelectionEnd(int init, int end, int laps)Triggered every time the user finish one interaction with the slider.
baseColorColor.fromRGBO(255, 255, 255, 0.1)The color used for the base of the circle.
selectionColorColor.fromRGBO(255, 255, 255, 0.3)The color used for the selection in the circle.
handlerColorColors.whiteThe color used for the handlers.
handlerOutterRadius12.0The radius for the outter circle around the handler.
showRoundedCapInSelectionfalse(Only for SingleCircularSlider) Shows a rounded cap at the edge of the selection slider with no handler.
showHandlerOuttertrueIf true will display an extra ring around the handlers.
sliderStrokeWidth12.0The stroke width for the slider (thickness).
shouldCountLapsfalseIf true, onSelectionChange will also return the updated number of laps.

Use Cases

Move complete selection

Move Selection

Single Handler

Sleep Single Slider

Laps

Sleep Single Slider Laps

Sleep Double Slider Laps

Sleep Time Selection

import 'dart:math';

import 'package:flutter/material.dart';

import 'package:flutter_circular_slider/flutter_circular_slider.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: SafeArea(
      child: Container(
          decoration: BoxDecoration(
            image: DecorationImage(
              image: AssetImage('images/background_morning.png'),
              fit: BoxFit.cover,
            ),
          ),
          child: SleepPage()),
    ));
  }
}

class SleepPage extends StatefulWidget {
  @override
  _SleepPageState createState() => _SleepPageState();
}

class _SleepPageState extends State<SleepPage> {
  final baseColor = Color.fromRGBO(255, 255, 255, 0.3);

  int initTime;
  int endTime;

  int inBedTime;
  int outBedTime;

  @override
  void initState() {
    super.initState();
    _shuffle();
  }

  void _shuffle() {
    setState(() {
      initTime = _generateRandomTime();
      endTime = _generateRandomTime();
      inBedTime = initTime;
      outBedTime = endTime;
    });
  }

  void _updateLabels(int init, int end) {
    setState(() {
      inBedTime = init;
      outBedTime = end;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        Text(
          'How long did you stay in bed?',
          style: TextStyle(color: Colors.white),
        ),
        DoubleCircularSlider(
          288,
          initTime,
          endTime,
          height: 260.0,
          width: 260.0,
          primarySectors: 6,
          secondarySectors: 24,
          baseColor: Color.fromRGBO(255, 255, 255, 0.1),
          selectionColor: baseColor,
          handlerColor: Colors.white,
          handlerOutterRadius: 12.0,
          onSelectionChange: _updateLabels,
          sliderStrokeWidth: 12.0,
          child: Padding(
            padding: const EdgeInsets.all(42.0),
            child: Center(
                child: Text('${_formatIntervalTime(inBedTime, outBedTime)}',
                    style: TextStyle(fontSize: 36.0, color: Colors.white))),
          ),
        ),
        Row(mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [
          _formatBedTime('IN THE', inBedTime),
          _formatBedTime('OUT OF', outBedTime),
        ]),
        FlatButton(
          child: Text('S H U F F L E'),
          color: baseColor,
          textColor: Colors.white,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(50.0),
          ),
          onPressed: _shuffle,
        ),
      ],
    );
  }

  Widget _formatBedTime(String pre, int time) {
    return Column(
      children: [
        Text(pre, style: TextStyle(color: baseColor)),
        Text('BED AT', style: TextStyle(color: baseColor)),
        Text(
          '${_formatTime(time)}',
          style: TextStyle(color: Colors.white),
        )
      ],
    );
  }

  String _formatTime(int time) {
    if (time == 0 || time == null) {
      return '00:00';
    }
    var hours = time ~/ 12;
    var minutes = (time % 12) * 5;
    return '$hours:$minutes';
  }

  String _formatIntervalTime(int init, int end) {
    var sleepTime = end > init ? end - init : 288 - init + end;
    var hours = sleepTime ~/ 12;
    var minutes = (sleepTime % 12) * 5;
    return '${hours}h${minutes}m';
  }

  int _generateRandomTime() => Random().nextInt(288);
}

Sleep Slider

Libraries

flutter_circular_slider