How to style the month cell in the Flutter Calendar?
In the Flutter Event Calendar, you can add active dates by using the reverse concept of the blackoutDates property.
STEP 1: In initState(), set the default values for event calendar.
List<DateTime>? _blackoutDateCollection= <DateTime>[];
List<DateTime>? _activeDates;
@override
void initState() {
DateTime today = DateTime.now();
today = DateTime(today.year, today.month, today.day);
_activeDates = [
today,
today.add(Duration(days: 5)),
today.add(Duration(days: 10)),
today.add(Duration(days: 15)),
today.add(Duration(days: 20)),
today.add(Duration(days: 25)),
today.add(Duration(days: 30)),
today.add(Duration(days: 35))
];
super.initState();
}
STEP 2: Use the onViewChanged callback to check if the visible dates match the active dates. If they match, those dates can be selected. Otherwise, add the remaining dates to the blackout dates collection.
void viewChanged(ViewChangedDetails viewChangedDetails) {
DateTime date;
DateTime startDate = viewChangedDetails.visibleDates[0];
DateTime endDate = viewChangedDetails
.visibleDates[viewChangedDetails.visibleDates.length - 1];
List<DateTime> _blackDates = <DateTime>[];
for (date = startDate;
date.isBefore(endDate) || date == endDate;
date = date.add(const Duration(days: 1))) {
if (_activeDates!.contains(date)) {
continue;
}
_blackDates.add(date);
}
SchedulerBinding.instance!.addPostFrameCallback((timeStamp) {
setState(() {
_blackoutDateCollection = _blackDates;
});
});
}
STEP 3: Assign the blackout date collection to the blackoutDates property of the Flutter event calendar.
child: SfCalendar( view: CalendarView.month, blackoutDates: _blackoutDateCollection, blackoutDatesTextStyle: TextStyle( color: Colors.grey, decoration: TextDecoration.lineThrough), onViewChanged: viewChanged, ),
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Conclusion
I hope you enjoyed learning about how to style the month cell in the Flutter Calendar.
You can refer to our Flutter Calender feature tour page to know about its other groundbreaking feature representations. You can also explore our Flutter Calendar documentation to understand how to create and manipulate data.
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