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How to update blackout dates using onViewChanged callback in the Flutter Date Range Picker

Platform: Flutter |
Control: SfDateRangePicker

In the Flutter date picker, you can update the blackoutDates by using the onViewChanged callback of the date picker.

Inside the state, set the default values for picker.

List<DateTime> _blackoutDates = <DateTime>[];

Using the onViewChanged callback, add first 5 visible dates to the _blackoutDateCollection and assign it _blackoutDates variable.

void viewChanged(DateRangePickerViewChangedArgs args) {
  List<DateTime> _blackoutDateCollection = <DateTime>[];
  final DateTime visibleStartDate = args.visibleDateRange.startDate!;
      .add(visibleStartDate.add(Duration(days: 1)));
      .add(visibleStartDate.add(Duration(days: 2)));
      .add(visibleStartDate.add(Duration(days: 3)));
      .add(visibleStartDate.add(Duration(days: 4)));
  SchedulerBinding.instance!.addPostFrameCallback((timeStamp) {
    setState(() {
      _blackoutDates = _blackoutDateCollection;

Assign _blackoutDates to the blackoutDates property of the DateRangePickerMonthViewSettings.

child: SfDateRangePicker(
  selectionMode: DateRangePickerSelectionMode.single,
  monthViewSettings: DateRangePickerMonthViewSettings(
      blackoutDates: _blackoutDates),
  monthCellStyle: DateRangePickerMonthCellStyle(blackoutDateTextStyle:
        color: Colors.red,
        decoration: TextDecoration.lineThrough),
  onViewChanged: viewChanged,

View sample in GitHub


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