flutter_circular_slider 1.1.4

A customizable widget to select intervals in a circular line.

example/lib/main.dart

import 'dart:math';

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter_circular_slider/flutter_circular_slider.dart';

void main() {
  debugPrintGestureArenaDiagnostics = true;
  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 LayoutBuilder(
        builder: (BuildContext context, BoxConstraints viewportConstraints) {
      return SingleChildScrollView(
        child: ConstrainedBox(
          constraints: BoxConstraints(
            minHeight: viewportConstraints.maxHeight,
          ),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            children: [
              Container(
                // A fixed-height child.
                color: Colors.yellow,
                height: 220.0,
              ),
              Text(
                'How long did you stay in bed?',
                style: TextStyle(color: Colors.white),
              ),
              CircularSlider(
                288,
                initTime,
                endTime,
                height: 220.0,
                width: 220.0,
                primarySectors: 6,
                secondarySectors: 24,
                baseColor: Color.fromRGBO(255, 255, 255, 0.1),
                selectionColor: baseColor,
                handlerColor: Colors.white,
                handlerOutterRadius: 12.0,
                onSelectionChange: _updateLabels,
                child: Padding(
                  padding: const EdgeInsets.all(12.0),
                  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,
              ),
              Container(
                // Another fixed-height child.
                color: Colors.green,
                height: 220.0,
              ),
            ],
          ),
        ),
      );
    });
  }

  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);
}