examples/api/lib/cupertino/date_picker/cupertino_timer_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 CupertinoTimerPicker

import 'package:flutter/cupertino.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'CupertinoTimerPicker Sample';

  @override
  Widget build(BuildContext context) {
    return const CupertinoApp(
      title: _title,
      home: CupertinoTimerPickerSample(),
    );
  }
}

class CupertinoTimerPickerSample extends StatefulWidget {
  const CupertinoTimerPickerSample({Key? key}) : super(key: key);

  @override
  State<CupertinoTimerPickerSample> createState() => _CupertinoTimerPickerSampleState();
}

class _CupertinoTimerPickerSampleState extends State<CupertinoTimerPickerSample> {
  Duration duration = const Duration(hours: 1, minutes: 23);

  // This shows a CupertinoModalPopup with a reasonable fixed height which hosts CupertinoTimerPicker.
  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(
      child: DefaultTextStyle(
        style: TextStyle(
          color: CupertinoColors.label.resolveFrom(context),
          fontSize: 22.0,
        ),
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              _TimerPickerItem(
                children: <Widget>[
                  const Text('Timer'),
                  CupertinoButton(
                    // Display a CupertinoTimerPicker with hour/minute mode.
                    onPressed: () => _showDialog(
                      CupertinoTimerPicker(
                        mode: CupertinoTimerPickerMode.hm,
                        initialTimerDuration: duration,
                        // This is called when the user changes the timer duration.
                        onTimerDurationChanged: (Duration newDuration) {
                          setState(() => duration = newDuration);
                        },
                      ),
                    ),
                    // In this example, the timer value is formatted manually. You can use intl package
                    // to format the value based on user's locale settings.
                    child: Text('$duration',
                      style: const TextStyle(
                        fontSize: 22.0,
                      ),
                    ),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}

// This class simply decorates a row of widgets.
class _TimerPickerItem extends StatelessWidget {
  const _TimerPickerItem({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,
        ),
      ),
    );
  }
}