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How to get the recurrence properties from RRule in the Flutter calendar

Platform: Flutter |
Control: SfCalendar |
Published Date: February 16, 2021 |
Last Revised Date: February 17, 2021

In the Flutter calendar, you can get the recurrence rule properties by using the parseRRule method.

In initState(), set the default values for calendar.

String _recurrenceRule;
DateTime _startTime = DateTime.now();
 
@override
void initState() {
  _startTime = DateTime.now();
  _recurrenceRule = 'FREQ=WEEKLY;INTERVAL=1;BYDAY=MO,WE;UNTIL=20210810';
  super.initState();
}

Using onPressed callback of the RaisedButton, show the alert dialog and get the recurrence properties of the recurrence rule.

child: Column(
  children: [
    Center(
      child: new RaisedButton(
        onPressed: _showDialog,
        child: new Text("Get recurrence rule"),
      ),
    ),
    Expanded(
        child: SfCalendar(
      view: CalendarView.month,
      dataSource: _getCalendarDataSource(),
    ))
  ],
),
 
_AppointmentDataSource _getCalendarDataSource() {
  List<Appointment> appointments = <Appointment>[];
  appointments.add(Appointment(
      startTime: _startTime,
      endTime: _startTime.add(Duration(hours: 1)),
      subject: 'Meeting',
      color: Colors.blue,
      recurrenceRule: _recurrenceRule));
 
  return _AppointmentDataSource(appointments);
}

In this alert dialog get the recurrence properties by using parseRRule method of the calendar and show the recurrence properties in alert window.

_showDialog() async {
 RecurrenceProperties _recurrenceProperties = SfCalendar.parseRRule(_recurrenceRule, _startTime);
 
  await showDialog(
    context: context, 
    child: new AlertDialog(
      contentPadding: const EdgeInsets.all(16.0),
      content: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
           'Type:'  + _recurrenceProperties.recurrenceType.toString(),
         ),
         Text(
            'Count:' + _recurrenceProperties.recurrenceCount.toString()
         ),
         Text(
           'StartDate:' + _recurrenceProperties.startDate.toString()
          ),
         Text(
           'EndDate:' + _recurrenceProperties.endDate.toString()
         ),
         Text(
          'Interval: ' +  _recurrenceProperties.interval.toString()
         ),
          Text(
          'Range:' + _recurrenceProperties.recurrenceRange.toString()
         ),
          Text(
            'WeekDays:' +  _recurrenceProperties.weekDays.toString()
         ),
         Text(
            'Week:' +  _recurrenceProperties.week.toString()
          ),
        Text(
            'DayOfMonth:' +  _recurrenceProperties.dayOfMonth.toString()
         ),
          Text(
            'DayOfWeek:' + _recurrenceProperties.dayOfWeek.toString()
         ),
         Text(
          'Month:' + _recurrenceProperties.month.toString()
        ),
        ],
      ),
      actions: <Widget>[
        new FlatButton(
            child: const Text('CANCEL'),
            onPressed: () {
              Navigator.pop(context);
            }),
        new FlatButton(
            child: const Text('OK'),
            onPressed: () {
              Navigator.pop(context);
            })
      ],
    ),
  );
}

View sample in GitHub

recurrence properties

 

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