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How to add active dates in the Flutter Date Range Picker (SfDateRangePicker)

Platform: Flutter |
Control: SfDateRangePicker |
Published Date: November 12, 2020 |
Last Revised Date: May 10, 2021

In the Flutter date range picker, you can add active dates by using reverse of the blackoutDates concept.

STEP 1: In initState(), set the default values for date range picker.

List<DateTime> _blackoutDateCollection = <DateTime>[];
late 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: Using onViewChanged callback, check the mentioned active dates are equal to the visible dates. If it is equal, then allow those dates are active and can be selected. Otherwise, add remaining dates in the blackout dates collection.

void viewChanged(DateRangePickerViewChangedArgs args) {
  DateTime date;
  DateTime startDate = args.visibleDateRange.startDate!;
  DateTime endDate = args.visibleDateRange.endDate!;
  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 above date collections to the blackoutDates property of the SfDateRangePicker.

child: SfDateRangePicker(
  view: DateRangePickerView.month,
  selectionMode: DateRangePickerSelectionMode.single,
  monthViewSettings: DateRangePickerMonthViewSettings(
    blackoutDates: _blackoutDateCollection,
  ),
  monthCellStyle: DateRangePickerMonthCellStyle(
    blackoutDateTextStyle: TextStyle(
        color: Colors.grey, decoration: TextDecoration.lineThrough),
  ),
  onViewChanged: viewChanged,
  showNavigationArrow: true,
),

View sample in GitHub

 

pickergif

 

 

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