| // Copyright 2014 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| import 'package:flutter/material.dart'; |
| |
| /// Flutter code sample for [showDateRangePicker]. |
| |
| void main() => runApp(const DatePickerApp()); |
| |
| class DatePickerApp extends StatelessWidget { |
| const DatePickerApp({super.key}); |
| |
| @override |
| Widget build(BuildContext context) { |
| return const MaterialApp( |
| restorationScopeId: 'app', |
| home: DatePickerExample(restorationId: 'main'), |
| ); |
| } |
| } |
| |
| class DatePickerExample extends StatefulWidget { |
| const DatePickerExample({super.key, this.restorationId}); |
| |
| final String? restorationId; |
| |
| @override |
| State<DatePickerExample> createState() => _DatePickerExampleState(); |
| } |
| |
| /// RestorationProperty objects can be used because of RestorationMixin. |
| class _DatePickerExampleState extends State<DatePickerExample> with RestorationMixin { |
| // In this example, the restoration ID for the mixin is passed in through |
| // the [StatefulWidget]'s constructor. |
| @override |
| String? get restorationId => widget.restorationId; |
| |
| final RestorableDateTimeN _startDate = RestorableDateTimeN(DateTime(2021)); |
| final RestorableDateTimeN _endDate = RestorableDateTimeN(DateTime(2021, 1, 5)); |
| late final RestorableRouteFuture<DateTimeRange?> _restorableDateRangePickerRouteFuture = |
| RestorableRouteFuture<DateTimeRange?>( |
| onComplete: _selectDateRange, |
| onPresent: (NavigatorState navigator, Object? arguments) { |
| return navigator.restorablePush(_dateRangePickerRoute, arguments: <String, dynamic>{ |
| 'initialStartDate': _startDate.value?.millisecondsSinceEpoch, |
| 'initialEndDate': _endDate.value?.millisecondsSinceEpoch, |
| }); |
| }, |
| ); |
| |
| void _selectDateRange(DateTimeRange? newSelectedDate) { |
| if (newSelectedDate != null) { |
| setState(() { |
| _startDate.value = newSelectedDate.start; |
| _endDate.value = newSelectedDate.end; |
| }); |
| } |
| } |
| |
| @override |
| void restoreState(RestorationBucket? oldBucket, bool initialRestore) { |
| registerForRestoration(_startDate, 'start_date'); |
| registerForRestoration(_endDate, 'end_date'); |
| registerForRestoration(_restorableDateRangePickerRouteFuture, 'date_picker_route_future'); |
| } |
| |
| @pragma('vm:entry-point') |
| static Route<DateTimeRange?> _dateRangePickerRoute( |
| BuildContext context, |
| Object? arguments, |
| ) { |
| return DialogRoute<DateTimeRange?>( |
| context: context, |
| builder: (BuildContext context) { |
| return DateRangePickerDialog( |
| restorationId: 'date_picker_dialog', |
| initialDateRange: _initialDateTimeRange(arguments! as Map<dynamic, dynamic>), |
| firstDate: DateTime(2021), |
| currentDate: DateTime(2021, 1, 25), |
| lastDate: DateTime(2022), |
| ); |
| }, |
| ); |
| } |
| |
| static DateTimeRange? _initialDateTimeRange(Map<dynamic, dynamic> arguments) { |
| if (arguments['initialStartDate'] != null && arguments['initialEndDate'] != null) { |
| return DateTimeRange( |
| start: DateTime.fromMillisecondsSinceEpoch(arguments['initialStartDate'] as int), |
| end: DateTime.fromMillisecondsSinceEpoch(arguments['initialEndDate'] as int), |
| ); |
| } |
| |
| return null; |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return Scaffold( |
| body: Center( |
| child: OutlinedButton( |
| onPressed: () { |
| _restorableDateRangePickerRouteFuture.present(); |
| }, |
| child: const Text('Open Date Range Picker'), |
| ), |
| ), |
| ); |
| } |
| } |