Flutter日历插件enough_icalendar的使用

发布于 1周前 作者 songsunli 来自 Flutter

Flutter日历插件enough_icalendar的使用

enough_icalendar 是一个纯Dart编写的iCalendar库，用于解析、生成和响应iCal/ics邀请。它完全符合iCalendar标准RFC 5545，并且符合所有VEvent功能的iTIP/RFC 5546。

安装

在您的pubspec.yaml文件中添加以下依赖：

dependencies:
  enough_icalendar: ^0.10.0

最新版本的enough_icalendar可以在Pub上找到。

使用方法

导入库

首先，导入enough_icalendar库：

import 'package:enough_icalendar/enough_icalendar.dart';

解析iCalendar请求

使用VComponent.parse(String)方法来解析指定的文本：

final text = '''BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
BEGIN:VEVENT
UID:uid1@example.com
DTSTAMP:19970714T170000Z
ORGANIZER;CN=John Doe:MAILTO:john.doe@example.com
DTSTART:19970714T170000Z
DTEND:19970715T035959Z
RRULE:FREQ=YEARLY
SUMMARY:Bastille Day Party
GEO:48.85299;2.36885
END:VEVENT
END:VCALENDAR''';

final icalendar = VComponent.parse(text) as VCalendar;
print(icalendar.productId); // -//hacksw/handcal//NONSGML v1.0//EN
final event = icalendar.event!;
print(event.summary); // Bastille Day Party
print(event.start); // 1997-06-14 at 17:00
print(event.end); // 1997-07-15 at 03:59:59
print(event.recurrenceRule?.toHumanReadableText()); // Annually
print(event.recurrenceRule?.toHumanReadableText(languageCode: 'de')); // Jährlich
print(event.organizer?.commonName); // John Doe
print(event.organizer?.email); // john.doe@example.com
print(event.geoLocation?.latitude); // 48.85299
print(event.geoLocation?.longitude); // 2.36885

生成邀请

使用VCalendar.createEvent(...)方法轻松创建新的邀请：

final invite = VCalendar.createEvent(
  organizerEmail: 'a@example.com',
  attendeeEmails: ['a@example.com', 'b@example.com', 'c@example.com'],
  rsvp: true,
  start: DateTime(2021, 07, 21, 10, 00),
  end: DateTime(2021, 07, 21, 11, 00),
  location: 'Big meeting room',
  url: Uri.parse('https://enough.de'),
  summary: 'Discussion',
  description:
      'Let us discuss how to proceed with the enough_icalendar development. It seems that basic functionality is now covered. What\'s next?',
  productId: 'enough_icalendar/v1',
);
print(invite);

接受或拒绝邀请

参与者可以使用VCalendar.replyWithParticipantStatus(...)方法更改其参与状态：

final reply = invite.replyWithParticipantStatus(ParticipantStatus.accepted,
    attendeeEmail: 'b@example.com');
print(reply);

委托事件参与

参与者可以通过调用VCalendar.delegate(...)方法将事件参与委托给其他人：

final delegationResult = original.delegate(
  fromEmail: 'c@example.com',
  toEmail: 'e@example.com',
);
print(delegationResult.requestForDelegatee);
print(delegationResult.replyForOrganizer);

创建和响应反提案

创建反提案

参与者可以使用VCalendar.counter(...)方法创建反提案：

final counterProposal = invite.counter(
  comment: 'This time fits better, also we need some more time.',
  start: DateTime(2021, 07, 23, 10, 00),
  end: DateTime(2021, 07, 23, 12, 00),
  location: 'Carnegie Hall',
);
print(counterProposal);

接受反提案

组织者可以使用VCalendar.acceptCounter(...)方法接受反提案：

final accepted = counterProposal.acceptCounter(
    comment: 'Accepted this proposed change of date and time');
print(accepted);

拒绝反提案

组织者可以使用VCalendar.declineCounter(...)方法拒绝反提案：

final declined = counterProposal.declineCounter(
    attendeeEmail: 'b@example.com',
    comment: 'Sorry, but we have to stick to the original schedule');
print(declined);

取消事件

取消所有参与者的事件

组织者可以使用VCalendar.cancelEvent(...)方法取消整个事件：

final cancelled = invite.cancelEvent(comment: 'Sorry, let\'s skip this completely');
print(cancelled);

取消特定参与者的事件

组织者可以使用VCalendar.cancelEventForAttendees(...)方法取消特定参与者的事件：

final cancelChanges = invite.cancelEventForAttendees(
  cancelledAttendeeEmails: ['b@example.com'],
  comment: 'You\'re off the hook, enjoy!',
);
print(cancelChanges.requestForCancelledAttendees);
print(cancelChanges.requestUpdateForGroup);

示例代码

以下是完整的示例代码，展示了如何使用enough_icalendar库进行各种操作：

import 'package:enough_icalendar/enough_icalendar.dart';

void main() {
  parse();
  final invite = generate();
  changeParticipantStatus(invite);
  final counterProposal = counter(invite);
  acceptCounter(counterProposal);
  declineCounter(counterProposal);
  cancelEventForAll(invite);
  cancelForAttendee(invite, 'b@example.com');
  delegate(invite);
}

void parse() {
  const text = '''BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
BEGIN:VEVENT
UID:uid1@example.com
DTSTAMP:19970714T170000Z
ORGANIZER;CN=John Doe:MAILTO:john.doe@example.com
DTSTART:19970714T170000Z
DTEND:19970715T035959Z
RRULE:FREQ=YEARLY
SUMMARY:Bastille Day Party
GEO:48.85299;2.36885
END:VEVENT
END:VCALENDAR''';
  final icalendar = VComponent.parse(text) as VCalendar;
  print(icalendar.productId);
  final event = icalendar.event;
  if (event == null) {
    return;
  }
  print(event.summary); // Bastille Day Party
  print(event.start); // 1997-06-14 at 17:00
  print(event.end); // 1997-07-15 at 03:59:59
  print(event.recurrenceRule?.toHumanReadableText()); // Annually
  print(event.recurrenceRule?.toHumanReadableText(languageCode: 'de')); // Jährlich
  print(event.organizer?.commonName); // John Doe
  print(event.organizer?.email); // john.doe@example.com
  print(event.geoLocation?.latitude); // 48.85299
  print(event.geoLocation?.longitude); // 2.36885
}

VCalendar generate() {
  final invite = VCalendar.createEvent(
    organizerEmail: 'a@example.com',
    attendeeEmails: ['a@example.com', 'b@example.com', 'c@example.com'],
    rsvp: true,
    start: DateTime(2021, 07, 21, 10, 00),
    end: DateTime(2021, 07, 21, 11, 00),
    location: 'Big meeting room',
    url: Uri.parse('https://enough.de'),
    summary: 'Discussion',
    description:
        'Let us discuss how to proceed with the enough_icalendar development. It seems that basic functionality is now covered. What\'s next?',
    productId: 'enough_icalendar/v1',
  );
  print('\nGenerated invite:');
  print(invite);
  return invite;
}

void changeParticipantStatus(VCalendar invite) {
  final reply = invite.replyWithParticipantStatus(ParticipantStatus.accepted,
      attendeeEmail: 'b@example.com');
  print('\nAccepted by attendee b@example.com:');
  print(reply);
}

void delegate(VCalendar invite) {
  final delegationResult = invite.delegate(
    fromEmail: 'c@example.com',
    toEmail: 'e@example.com',
  );
  print('\nRequest for delegatee:');
  print(delegationResult.requestForDelegatee);
  print('\nReply for organizer:');
  print(delegationResult.replyForOrganizer);
}

VCalendar counter(VCalendar invite) {
  final counterProposal = invite.counter(
    comment: 'This time fits better, also we need some more time.',
    start: DateTime(2021, 07, 23, 10, 00),
    end: DateTime(2021, 07, 23, 12, 00),
    location: 'Carnegie Hall',
  );
  print('\nCounter proposal:');
  print(counterProposal);
  return counterProposal;
}

void acceptCounter(VCalendar counterProposal) {
  final accepted = counterProposal.acceptCounter(
      comment: 'Accepted this proposed change of date and time');
  print('\nAccepted counter proposal:');
  print(accepted);
}

void declineCounter(VCalendar counterProposal) {
  final declined = counterProposal.declineCounter(
      attendeeEmail: 'b@example.com',
      comment: 'Sorry, but we have to stick to the original schedule');
  print('Declined counter proposal:');
  print(declined);
}

void cancelEventForAll(VCalendar invite) {
  final cancelled =
      invite.cancelEvent(comment: 'Sorry, let\'s skip this completely');
  print('\nCancelled event:');
  print(cancelled);
}

void cancelForAttendee(VCalendar invite, String cancelledAttendeeEmail) {
  final cancelChanges = invite.cancelEventForAttendees(
    cancelledAttendeeEmails: [cancelledAttendeeEmail],
    comment: 'You\'re off the hook, enjoy!',
  );
  print('\nChanges for cancelled attendees:');
  print(cancelChanges.requestForCancelledAttendees);
  print('\nChanges for the group:');
  print(cancelChanges.requestUpdateForGroup);
}

通过以上代码，您可以全面了解如何使用enough_icalendar库来处理iCalendar相关的操作。希望这些信息对您有所帮助！


更多关于Flutter日历插件enough_icalendar的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

Harmonyos Next教程
1 回复

更多关于Flutter日历插件enough_icalendar的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


当然，以下是如何在Flutter项目中使用enough_icalendar插件的一个示例。这个插件允许你展示和操作日历事件。我们将通过一个简单的示例来展示如何使用这个插件。

首先，确保你已经在pubspec.yaml文件中添加了enough_icalendar依赖：

dependencies:
  flutter:
    sdk: flutter
  enough_icalendar: ^最新版本号  # 请替换为最新的版本号

然后运行flutter pub get来获取依赖。

接下来，我们可以创建一个简单的Flutter应用来展示如何使用enough_icalendar。

1. 导入必要的包

在你的main.dart文件中，首先导入必要的包：

import 'package:flutter/material.dart';
import 'package:enough_icalendar/enough_icalendar.dart';

2. 创建事件数据

我们需要创建一些ICalendar事件数据。这里是一个简单的示例：

List<ICalendarEvent> createEvents() {
  return [
    ICalendarEvent(
      summary: 'Event 1',
      description: 'This is the first event',
      dtStart: DateTime(2023, 10, 1, 10, 0),
      dtEnd: DateTime(2023, 10, 1, 12, 0),
    ),
    ICalendarEvent(
      summary: 'Event 2',
      description: 'This is the second event',
      dtStart: DateTime(2023, 10, 2, 14, 0),
      dtEnd: DateTime(2023, 10, 2, 16, 0),
    ),
  ];
}

3. 创建日历视图

现在我们可以创建一个简单的日历视图来展示这些事件：

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Calendar Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: CalendarScreen(),
    );
  }
}

class CalendarScreen extends StatefulWidget {
  @override
  _CalendarScreenState createState() => _CalendarScreenState();
}

class _CalendarScreenState extends State<CalendarScreen> {
  late List<ICalendarEvent> events;

  @override
  void initState() {
    super.initState();
    events = createEvents();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Calendar Demo'),
      ),
      body: CalendarWidget(
        events: events,
        initialSelectedDate: DateTime.now(),
        onDaySelected: (date, events) {
          print('Selected date: $date');
          print('Events: $events');
        },
      ),
    );
  }
}

class CalendarWidget extends StatefulWidget {
  final List<ICalendarEvent> events;
  final DateTime initialSelectedDate;
  final ValueChanged<DateTime> onDaySelected;

  CalendarWidget({
    required this.events,
    required this.initialSelectedDate,
    required this.onDaySelected,
  });

  @override
  _CalendarWidgetState createState() => _CalendarWidgetState();
}

class _CalendarWidgetState extends State<CalendarWidget> {
  late DateTime selectedDate;

  @override
  void initState() {
    super.initState();
    selectedDate = widget.initialSelectedDate;
  }

  @override
  Widget build(BuildContext context) {
    List<ICalendarEvent> filteredEvents = widget.events
        .where((event) =>
            event.dtStart.isAtSameDayAs(selectedDate) ||
            event.dtEnd.isAtSameDayAs(selectedDate) ||
            event.dtStart.isBefore(selectedDate) && event.dtEnd.isAfter(selectedDate))
        .toList();

    return Column(
      children: [
        GestureDetector(
          onTap: () {
            showDatePicker(
              context: context,
              initialDate: selectedDate,
              firstDate: DateTime(2000),
              lastDate: DateTime(2100),
            ).then((date) {
              if (date != null) {
                setState(() {
                  selectedDate = date;
                  widget.onDaySelected(date, filteredEvents);
                });
              }
            });
          },
          child: Text(
            '${selectedDate.year}-${selectedDate.month.toString().padLeft(2, '0')}-${selectedDate.day.toString().padLeft(2, '0')}',
            style: TextStyle(fontSize: 24),
          ),
        ),
        SizedBox(height: 20),
        Expanded(
          child: ListView.builder(
            itemCount: filteredEvents.length,
            itemBuilder: (context, index) {
              ICalendarEvent event = filteredEvents[index];
              return Card(
                child: ListTile(
                  title: Text(event.summary!),
                  subtitle: Text(event.description ?? ''),
                ),
              );
            },
          ),
        ),
      ],
    );
  }
}

4. 运行应用

现在，你可以运行你的Flutter应用，你应该能看到一个简单的日历界面，其中展示了选定日期的事件。

这个示例只是一个基础实现，enough_icalendar插件还提供了更多功能，比如解析和生成iCalendar文件等，你可以根据需求进一步扩展。

回到顶部