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feat: new option allowBackwardsDaySelection #41

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feat: new option allowBackwardsDaySelection #41

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12 changes: 11 additions & 1 deletion lib/src/controllers.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,9 @@ class RangePickerController {
this.minimumDateRangeLength,
this.maximumDateRangeLength,
this.disabledDates = const [],
this.allowSingleTapDaySelection = false}) {
this.allowSingleTapDaySelection = false,
this.allowBackwardsDaySelection = true})
: origMinDate = minDate {
if (dateRange != null) {
startDate = dateRange.start;
endDate = dateRange.end;
Expand All @@ -29,11 +31,16 @@ class RangePickerController {

final bool allowSingleTapDaySelection;

/// Whether the user can select a date range backwards (i.e. start date is after end date).
final bool allowBackwardsDaySelection;

final ValueChanged<DateRange?> onDateRangeChanged;

/// The minimum date that can be selected. (inclusive)
DateTime? minDate;

final DateTime? origMinDate;

/// The maximum date that can be selected. (inclusive)
DateTime? maxDate;

Expand Down Expand Up @@ -84,6 +91,9 @@ class RangePickerController {
onDateRangeChanged(DateRange(startDate!, startDate!));
}
}
if (!allowBackwardsDaySelection) {
minDate = startDate != null && endDate == null ? startDate : origMinDate;
}
}

/// Returns whether the [date] is in the selected range or not.
Expand Down
6 changes: 6 additions & 0 deletions lib/src/widgets/date_range_picker.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -151,6 +151,7 @@ class DateRangePickerWidget extends StatefulWidget {
this.displayMonthsSeparator = true,
this.separatorThickness = 1,
this.allowSingleTapDaySelection = false,
this.allowBackwardsDaySelection = true,
this.firstDayOfWeek = 0,
this.lengthOfDateName = 3,
}) : assert(
Expand Down Expand Up @@ -197,6 +198,10 @@ class DateRangePickerWidget extends StatefulWidget {
/// day twice).
final bool allowSingleTapDaySelection;

/// Set [allowBackwardsDaySelection] to false to prevent the user from selecting
/// a date range backwards (i.e. start date is after end date).
final bool allowBackwardsDaySelection;

/// The theme used to customize the appearance of the picker.
final CalendarTheme theme;

Expand Down Expand Up @@ -226,6 +231,7 @@ class DateRangePickerWidgetState extends State<DateRangePickerWidget> {
minimumDateRangeLength: widget.minimumDateRangeLength,
maximumDateRangeLength: widget.maximumDateRangeLength,
allowSingleTapDaySelection: widget.allowSingleTapDaySelection,
allowBackwardsDaySelection: widget.allowBackwardsDaySelection,
);

late final calendarController = CalendarWidgetController(
Expand Down