tod | Time of day and shift types for Ruby

import 'package:flutter/material.dart';

class Time extends StatefulWidget {
  @override
  _TimeState createState() => _TimeState();
}

class _TimeState extends State {
  String time = "Press Button to see time";
  bool isSelected = false;
  @override
  Widget build(BuildContext context) {
    TimeOfDay startTime = TimeOfDay(hour: 01, minute: 00);
    final endTime = TimeOfDay(hour: 23, minute: 59);
    final step = Duration(minutes: 5);

    Iterable getTimes(
        TimeOfDay startTime, TimeOfDay endTime, Duration step) sync* {
      var hour = startTime.hour;
      var minute = startTime.minute;

      do {
        yield TimeOfDay(hour: hour, minute: minute);
        minute += step.inMinutes;
        while (minute >= 60) {
          minute -= 60;
          hour++;
        }
      } while (hour < endTime.hour ||
          (hour == endTime.hour && minute <= endTime.minute));
    }

    final times = getTimes(startTime, endTime, step)
        .where((t) =>
            t.minute >= TimeOfDay.now().minute &&
            t.hour >= TimeOfDay.now().hour)
        .map((tod) => tod.format(context));

    return Scaffold(
      body: SafeArea(
        child: Container(
          width: MediaQuery.of(context).size.width,
          child: Wrap(
            direction: Axis.horizontal,
            children: times
                .map(
                  (t) => GestureDetector(
                    onTap: () {
                      setState(() {
                        isSelected = !isSelected;
                      });
                    },
                    child: Container(
                      margin: EdgeInsets.all(10.0),
                      decoration: BoxDecoration(
                          color: isSelected ? Colors.deepOrange : Colors.white,
                          border: Border.all(
                            color: Colors.deepOrange,
                            width: 1,
                          ),
                          borderRadius: BorderRadius.circular(
                            10.0,
                          ),
                          boxShadow: [
                            BoxShadow(
                              color: isSelected ? Colors.black26 : Colors.white,
                              blurRadius: 5,
                              offset: Offset(2, 2),
                            )
                          ]),
                      padding: EdgeInsets.all(10.0),
                      child: Text(
                        t,
                        style: TextStyle(
                          color: isSelected ? Colors.white : Colors.deepOrange,
                        ),
                      ),
                    ),
                  ),
                )
                .toList(),
          ),
        ),
      ),
    );
  }
}