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How to get the appointments between the given start and end date in the Flutter Calendar
1 min read
In the Flutter Event Calendar, the total appointments in the visible dates are achieved by using getVisibleAppointments method.
In initState(), set the default values for the calendar.
List<Meeting>? _appointments;
List<Appointment>? _visibleAppointments = <Appointment>[];
List<String> _subjectCollection = <String>[];
late _MeetingDataSource _events;
List<Color> _colorCollection = <Color>[];
@override
void initState() {
_appointments = _addAppointment();
_events = _MeetingDataSource(_appointments!);
super.initState();
}
Use the getVisibleAppointments method in the onViewChanged callback.
void viewChanged(ViewChangedDetails viewChangedDetails) {
List<DateTime> _date = viewChangedDetails.visibleDates;
_visibleAppointments =
_events!.getVisibleAppointments(_date[0], '', _date[_date.length - 1]);
}
Using the onPressed callback of the button, show the appointment details in the alert window.
RaisedButton(
child: Text('Get visible appointments'),
onPressed: _showDialog,
),
_showDialog() async {
await showDialog(
builder: (context) => new AlertDialog(
title: Container(
child: Text("Visible dates contains " +
_visibleAppointments!.length.toString() +
" appointments"),
),
contentPadding: const EdgeInsets.all(16.0),
content: ListView.builder(
itemCount: _visibleAppointments!.length,
itemBuilder: (BuildContext context, int index) {
return Container(
color: _visibleAppointments![index].color,
child: Text(_visibleAppointments![index].subject));
}),
actions: <Widget>[
new FlatButton(
child: const Text('OK'),
onPressed: () {
Navigator.pop(context);
})
],
),
context: context,
);
}
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