flutter_clock/lib/index_page.dart

import 'dart:async';
import 'dart:math' as math;

import 'package:flutter/material.dart';
import 'package:flutter_clock/pages/alarm_page.dart';
import 'package:flutter_clock/pages/clock_page.dart';
import 'package:flutter_clock/pages/stopwatch_page.dart';
import 'package:flutter_clock/pages/timer/timer_page.dart';

/// Description: main page
/// Time       : 04/06/2025 Sunday
/// Author     : liuyuqi.gov@msn.cn
class IndexPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _IndexPageState();
  }
}

class _IndexPageState extends State<IndexPage>
    with SingleTickerProviderStateMixin {
  late TabController _tabController;
  final List<Widget> _tabs = [
    Tab(child: Text('Alarm', style: TextStyle(fontSize: 16))),
    Tab(child: Text('Clock', style: TextStyle(fontSize: 16))),
    Tab(child: Text('Stopwatch', style: TextStyle(fontSize: 16))),
    Tab(child: Text('Timer', style: TextStyle(fontSize: 16))),
  ];

  final _utcMidnightRadiansOffset = radiansFromDegrees(-64);
  static const _secondsInDay = 86400;
  DateTime _localTime = DateTime.now();

  @override
  void initState() {
    super.initState();
    _tabController = TabController(
        length: 4,
        vsync: this,
        initialIndex: 3); // Timer tab is selected by default
    Timer.periodic(Duration(seconds: 1),
        (_) => setState(() => _localTime = DateTime.now()));
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.white,
        elevation: 0,
        title: TabBar(
          controller: _tabController,
          tabs: _tabs,
          labelColor: Colors.blue,
          unselectedLabelColor: Colors.black,
          indicatorColor: Colors.blue,
          indicatorWeight: 3,
        ),
        // actions: [
        //   IconButton(
        //     icon: Icon(Icons.more_vert, color: Colors.black),
        //     onPressed: () {
        //       // More options menu

        //     },
        //   ),
        // ],
      ),
      body: TabBarView(
        controller: _tabController,
        children: [
          AlarmPage(),
          ClockPage(),
          StopwatchPage(),
          TimerPage(),
        ],
      ),
    );
  }

  static double radiansFromDegrees(double degrees) => degrees * math.pi / 180;

  static double radiansFromTime(DateTime time) {
    final midnightToday = DateTime(time.year, time.month, time.day);
    final secondsSinceMidnight = midnightToday.difference(time).inSeconds;
    final percent = secondsSinceMidnight / _secondsInDay;
    final degrees = percent * 360;
    return radiansFromDegrees(degrees);
  }
}