dateapp/lib/pages/calendar.dart

109 lines
3.9 KiB
Dart

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import '../utils/gregorian_date.dart';
class CalendarScreen extends StatefulWidget {
const CalendarScreen({Key? key}) : super(key: key);
@override
State<CalendarScreen> createState() => _CalendarScreenState();
}
class _CalendarScreenState extends State<CalendarScreen> {
DateTimeRange? _selectedDateRange;
@override
Widget build(BuildContext context) {
void showRangeDialog() async {
final DateTimeRange? result = await showDateRangePicker(
context: context,
firstDate: DateTime(0, 1, 1),
lastDate: DateTime(3000, 12, 31),
locale: const Locale('en', 'GB'),
currentDate: DateTime.now(),
saveText: 'Done',
);
if (result != null) {
setState(() {
_selectedDateRange = result;
});
}
}
final startDate = _selectedDateRange?.start ?? DateTime(2020, 1, 1);
final endDate = _selectedDateRange?.end ?? DateTime(2022, 1, 1);
int diffD = GregorianDate.differenceInDays(startDate, endDate);
List<int> diffYMD = GregorianDate.differenceInYearsMonthsDays(diffD);
dynamic startDateString =
DateFormat("dd MMM yyyy").format(startDate).toString();
dynamic endDateString =
DateFormat("dd MMM yyyy").format(endDate).toString();
return Scaffold(
appBar: AppBar(
title: const Text("Calendar Calculator"),
elevation: 4,
shadowColor: Theme.of(context).shadowColor,
),
body: _selectedDateRange == null
? const Padding(
padding: EdgeInsets.all(30),
child: Center(
child:
Text('Select the date range by using the calendar button'),
),
)
: Padding(
padding: const EdgeInsets.all(30),
child: Center(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Text("Dates",
style: TextStyle(
fontSize: 30, fontWeight: FontWeight.bold)),
const Text("Start Date", style: TextStyle(fontSize: 14)),
const SizedBox(height: 5),
Text(
startDateString,
style: const TextStyle(
fontSize: 22, fontWeight: FontWeight.bold),
),
const SizedBox(height: 10),
const Text("End Date", style: TextStyle(fontSize: 14)),
const SizedBox(height: 5),
Text(endDateString,
style: const TextStyle(
fontSize: 22, fontWeight: FontWeight.bold)),
const SizedBox(height: 20),
const Text("Difference",
style: TextStyle(
fontSize: 30, fontWeight: FontWeight.bold)),
const Text("Date Range", style: TextStyle(fontSize: 14)),
Text(
"${diffYMD[3]} days \n${diffYMD[2]} weeks \n${diffYMD[1]} months\n${diffYMD[0]} years",
style: const TextStyle(
fontSize: 24, fontWeight: FontWeight.bold)),
const SizedBox(height: 10),
const Text("Date Range in days",
style: TextStyle(fontSize: 14)),
Text("$diffD days",
style: const TextStyle(
fontSize: 24, fontWeight: FontWeight.bold)),
],
),
),
),
// This button is used to show the date range picker
floatingActionButton: FloatingActionButton(
onPressed: showRangeDialog,
child: const Icon(Icons.date_range),
),
);
}
}