Category / Section
How to use a negative value for BYSETPOS in a RRule of recurrence appointment in the Flutter Calendar
1 min read
In the Flutter Event Calendar, show the appointments in a particular day of the last week and the week before last of the month by using the BYSETPOS value as -1 and -2.
Here the recurrence appointment is created on Thursday of the week before last.
In initState(), set the default values for calendar.
String _recurrenceRule = '';
class ScheduleExample extends State<RecurrenceAppointmentPosition> {
List<String> _setPosition = <String>[
'BYSETPOS -1',
'BYSETPOS -2',
];
Based on the selected BYSETPOS, RRule is updated.
appBar: AppBar(
title: Text("Select BYSETPOS"),
actions: <Widget>[
IconButton(icon: Icon(Icons.arrow_forward), onPressed: () {}),
PopupMenuButton<String>(
icon: Icon(Icons.party_mode),
itemBuilder: (BuildContext context) {
return _setPosition.map((String choice) {
return PopupMenuItem<String>(
value: choice,
child: Text(choice),
);
}).toList();
},
onSelected: (String value) {
setState(() {
if (value == 'BYSETPOS -1') {
_recurrenceRule = 'FREQ=MONTHLY;COUNT=10;BYDAY=TH;BYSETPOS=-1';
} else if (value == 'BYSETPOS -2') {
_recurrenceRule ='FREQ=MONTHLY;COUNT=10;BYDAY=TH;BYSETPOS=-2';
}
});
},
),
],
),
body: SfCalendar(
view: CalendarView.month,
dataSource: _getCalendarDataSource(),
)
_AppointmentDataSource _getCalendarDataSource() {
List<Appointment> appointments = <Appointment>[];
appointments.add(Appointment(
startTime: DateTime.now().add(Duration(hours: 1)),
endTime: DateTime.now().add(Duration(hours: 2)),
subject: 'Planning',
color: Colors.orangeAccent,
recurrenceRule: _recurrenceRule));
return _AppointmentDataSource(appointments);
}
|
