flutter/examples/api/lib/cupertino/date_picker/cupertino_date_picker.0.dart

// 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.

// Flutter code sample for CupertinoDatePicker

import 'package:flutter/cupertino.dart';

void main() => runApp(const DatePickerApp());

class DatePickerApp extends StatelessWidget {
  const DatePickerApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const CupertinoApp(
      theme: CupertinoThemeData(brightness: Brightness.light),
      home: DatePickerExample(),
    );
  }
}

class DatePickerExample extends StatefulWidget {
  const DatePickerExample({super.key});

  @override
  State<DatePickerExample> createState() => _DatePickerExampleState();
}

class _DatePickerExampleState extends State<DatePickerExample> {
  DateTime date = DateTime(2016, 10, 26);
  DateTime time = DateTime(2016, 5, 10, 22, 35);
  DateTime dateTime = DateTime(2016, 8, 3, 17, 45);

  // This shows a CupertinoModalPopup with a reasonable fixed height which hosts CupertinoDatePicker.
  void _showDialog(Widget child) {
    showCupertinoModalPopup<void>(
      context: context,
      builder: (BuildContext context) => Container(
        height: 216,
        padding: const EdgeInsets.only(top: 6.0),
        // The Bottom margin is provided to align the popup above the system navigation bar.
        margin: EdgeInsets.only(
          bottom: MediaQuery.of(context).viewInsets.bottom,
        ),
        // Provide a background color for the popup.
        color: CupertinoColors.systemBackground.resolveFrom(context),
        // Use a SafeArea widget to avoid system overlaps.
        child: SafeArea(
          top: false,
          child: child,
        ),
      )
    );
  }

  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: const CupertinoNavigationBar(
        middle: Text('CupertinoDatePicker Sample'),
      ),
      child: DefaultTextStyle(
        style: TextStyle(
          color: CupertinoColors.label.resolveFrom(context),
          fontSize: 22.0,
        ),
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              _DatePickerItem(
                children: <Widget>[
                  const Text('Date'),
                  CupertinoButton(
                    // Display a CupertinoDatePicker in date picker mode.
                    onPressed: () => _showDialog(
                      CupertinoDatePicker(
                        initialDateTime: date,
                        mode: CupertinoDatePickerMode.date,
                        use24hFormat: true,
                        // This is called when the user changes the date.
                        onDateTimeChanged: (DateTime newDate) {
                          setState(() => date = newDate);
                        },
                      ),
                    ),
                    // In this example, the date value is formatted manually. You can use intl package
                    // to format the value based on user's locale settings.
                    child: Text('${date.month}-${date.day}-${date.year}',
                      style: const TextStyle(
                        fontSize: 22.0,
                      ),
                    ),
                  ),
                ],
              ),
              _DatePickerItem(
                children: <Widget>[
                  const Text('Time'),
                  CupertinoButton(
                    // Display a CupertinoDatePicker in time picker mode.
                    onPressed: () => _showDialog(
                      CupertinoDatePicker(
                        initialDateTime: time,
                        mode: CupertinoDatePickerMode.time,
                        use24hFormat: true,
                        // This is called when the user changes the time.
                        onDateTimeChanged: (DateTime newTime) {
                          setState(() => time = newTime);
                        },
                      ),
                    ),
                    // In this example, the time value is formatted manually. You can use intl package to
                    // format the value based on the user's locale settings.
                    child: Text('${time.hour}:${time.minute}',
                      style: const TextStyle(
                        fontSize: 22.0,
                      ),
                    ),
                  ),
                ],
              ),
              _DatePickerItem(
                children: <Widget>[
                  const Text('DateTime'),
                  CupertinoButton(
                    // Display a CupertinoDatePicker in dateTime picker mode.
                    onPressed: () => _showDialog(
                      CupertinoDatePicker(
                        initialDateTime: dateTime,
                        use24hFormat: true,
                        // This is called when the user changes the dateTime.
                        onDateTimeChanged: (DateTime newDateTime) {
                          setState(() => dateTime = newDateTime);
                        },
                      ),
                    ),
                    // In this example, time value is formatted manually. You can use intl package to
                    // format the value based on the user's locale settings.
                    child: Text('${dateTime.month}-${dateTime.day}-${dateTime.year} ${dateTime.hour}:${dateTime.minute}',
                      style: const TextStyle(
                        fontSize: 22.0,
                      ),
                    ),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}

// This class simply decorates a row of widgets.
class _DatePickerItem extends StatelessWidget {
  const _DatePickerItem({required this.children});

  final List<Widget> children;

  @override
  Widget build(BuildContext context) {
    return DecoratedBox(
      decoration: const BoxDecoration(
        border: Border(
          top: BorderSide(
            color: CupertinoColors.inactiveGray,
            width: 0.0,
          ),
          bottom: BorderSide(
            color: CupertinoColors.inactiveGray,
            width: 0.0,
          ),
        ),
      ),
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 16.0),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: children,
        ),
      ),
    );
  }
}