fix: Fixes issue #382: Added support for 3-Days week view

example/lib/widgets/week_view_widget.dart

@@ -15,8 +15,12 @@ class WeekViewWidget extends StatelessWidget {
       key: state,
       width: width,
       showLiveTimeLineInAllDays: true,
-      eventArranger: SideEventArranger(maxWidth: 30),
+      showThreeDayView: true,
+      // TODO(Shubham): May required additional asserts
+      // If weekdays provided, shown/hidden weekends
+      eventArranger: SideEventArranger(),
       timeLineWidth: 65,
+      // weekDays: [WeekDays.monday, WeekDays.tuesday, WeekDays.wednesday],
       scrollPhysics: const BouncingScrollPhysics(),
       liveTimeIndicatorSettings: LiveTimeIndicatorSettings(
         color: Colors.redAccent,

lib/src/components/headers/week_page_header.dart

@@ -40,6 +40,7 @@ class WeekPageHeader extends CalendarPageHeader {
           headerStyle: headerStyle,
         );
 
+  // TODO(Shubham): Update this for 3-days view
   static String _weekStringBuilder(DateTime date, {DateTime? secondaryDate}) =>
       "${date.day} / ${date.month} / ${date.year} to "
       "${secondaryDate != null ? "${secondaryDate.day} / "

lib/src/extensions.dart

@@ -52,7 +52,10 @@ extension DateTimeExtensions on DateTime {
   /// will return dates
   /// [6,7,8,9,10,11,12]
   /// Where on 6th there will be monday and on 12th there will be Sunday
-  List<DateTime> datesOfWeek({WeekDays start = WeekDays.monday}) {
+  List<DateTime> datesOfWeek({
+    bool showThreeDays = false,
+    WeekDays start = WeekDays.monday,
+  }) {
     // Here %7 ensure that we do not subtract >6 and <0 days.
     // Initial formula is,
     //    difference = (weekday - startInt)%7
@@ -61,18 +64,12 @@ extension DateTimeExtensions on DateTime {
     // adding 1 in index. So, new formula with WeekDays is,
     //    difference = (weekdays - (start.index + 1))%7
     //
-    final startDay =
-        DateTime(year, month, day - (weekday - start.index - 1) % 7);
-
-    return [
-      startDay,
-      DateTime(startDay.year, startDay.month, startDay.day + 1),
-      DateTime(startDay.year, startDay.month, startDay.day + 2),
-      DateTime(startDay.year, startDay.month, startDay.day + 3),
-      DateTime(startDay.year, startDay.month, startDay.day + 4),
-      DateTime(startDay.year, startDay.month, startDay.day + 5),
-      DateTime(startDay.year, startDay.month, startDay.day + 6),
-    ];
+    final days = showThreeDays ? day : day - (weekday - start.index - 1) % 7;
+    final startDay = DateTime(year, month, days);
+
+    return List.generate(showThreeDays ? 3 : 7, (index) {
+      return startDay.add(Duration(days: index));
+    });
   }
 
   /// Returns the first date of week containing the current date

lib/src/week_view/_internal_week_view_page.dart

@@ -139,6 +139,8 @@ class InternalWeekViewPage<T extends Object?> extends StatefulWidget {
   /// Flag to display quarter hours
   final bool showQuarterHours;
 
+  final bool showThreeDaysView;
+
   /// Emulate vertical line offset from hour line starts.
   final double emulateVerticalOffsetBy;
 
@@ -205,6 +207,7 @@ class InternalWeekViewPage<T extends Object?> extends StatefulWidget {
     required this.showWeekDayAtBottom,
     required this.showHalfHours,
     required this.showQuarterHours,
+    required this.showThreeDaysView,
     required this.emulateVerticalOffsetBy,
     required this.onTileDoubleTap,
     required this.endHour,
@@ -505,15 +508,23 @@ class _InternalWeekViewPageState<T extends Object?>
 
   List<DateTime> _filteredDate() {
     final output = <DateTime>[];
-
     final weekDays = widget.weekDays.toList();
-
-    for (final date in widget.dates) {
-      if (weekDays.any((weekDay) => weekDay.index + 1 == date.weekday)) {
-        output.add(date);
+    final totalWeekDays = widget.showThreeDaysView ? 3 : 7;
+
+    if (widget.showThreeDaysView) {
+      final startDate = widget.dates.first;
+      int i = 0; // Add 2 days to show 3 days
+      while (i < 3) {
+        output.add(startDate.add(Duration(days: i)));
+        i++;
+      }
+    } else {
+      for (final date in widget.dates.take(totalWeekDays)) {
+        if (weekDays.any((weekDay) => weekDay.index + 1 == date.weekday)) {
+          output.add(date);
+        }
       }
     }
-
     return output;
   }
 }

lib/src/week_view/week_view.dart

@@ -172,6 +172,8 @@ class WeekView<T extends Object?> extends StatefulWidget {
   /// saturday and sunday, only monday and tuesday will be visible in week view.
   final bool showWeekends;
 
+  final bool showThreeDayView;
+
   /// Defines which days should be displayed in one week.
   ///
   /// By default all the days will be visible.
@@ -287,6 +289,7 @@ class WeekView<T extends Object?> extends StatefulWidget {
     this.onDateTap,
     this.weekDays = WeekDays.values,
     this.showWeekends = true,
+    this.showThreeDayView = false,
     this.startDay = WeekDays.monday,
     this.minuteSlotSize = MinuteSlotSize.minutes60,
     this.weekDetectorBuilder,
@@ -514,9 +517,10 @@ class WeekViewState<T extends Object?> extends State<WeekView<T>> {
                       physics: widget.pageViewPhysics,
                       onPageChanged: _onPageChange,
                       itemBuilder: (_, index) {
-                        final dates = DateTime(_minDate.year, _minDate.month,
-                                _minDate.day + (index * DateTime.daysPerWeek))
-                            .datesOfWeek(start: widget.startDay);
+                        final dates = _currentStartDate.datesOfWeek(
+                          start: widget.startDay,
+                          showThreeDays: widget.showThreeDayView,
+                        );
 
                         return ValueListenableBuilder(
                           valueListenable: _scrollConfiguration,
@@ -565,6 +569,7 @@ class WeekViewState<T extends Object?> extends State<WeekView<T>> {
                             startHour: _startHour,
                             showHalfHours: widget.showHalfHours,
                             showQuarterHours: widget.showQuarterHours,
+                            showThreeDaysView: widget.showThreeDayView,
                             emulateVerticalOffsetBy:
                                 widget.emulateVerticalOffsetBy,
                             showWeekDayAtBottom: widget.showWeekDayAtBottom,
@@ -623,7 +628,8 @@ class WeekViewState<T extends Object?> extends State<WeekView<T>> {
         "Make sure you are providing weekdays in initialization of "
         "WeekView. or showWeekends is true if you are providing only "
         "saturday or sunday in weekDays.");
-    _totalDaysInWeek = _weekDays.length;
+    // TODO(Shubham): Update weekdays to 3
+    _totalDaysInWeek = widget.showThreeDayView ? 3 : _weekDays.length;
   }
 
   void _updateViewDimensions() {
@@ -648,6 +654,7 @@ class WeekViewState<T extends Object?> extends State<WeekView<T>> {
     assert(_hourIndicatorSettings.height < _hourHeight,
         "hourIndicator height must be less than minuteHeight * 60");
 
+    // TODO(Shubham): Update total days in week
     _weekTitleWidth =
         (_width - _timeLineWidth - _hourIndicatorSettings.offset) /
             _totalDaysInWeek;
@@ -716,9 +723,8 @@ class WeekViewState<T extends Object?> extends State<WeekView<T>> {
     } else if (_currentWeek.isAfter(_maxDate)) {
       _currentWeek = _maxDate;
     }
-
     _currentStartDate = _currentWeek.firstDayOfWeek(start: widget.startDay);
-    _currentEndDate = _currentWeek.lastDayOfWeek(start: widget.startDay);
+    _currentEndDate = _currentWeek.add(Duration(days: 2));
     _currentIndex =
         _minDate.getWeekDifference(_currentEndDate, start: widget.startDay);
   }
@@ -728,7 +734,6 @@ class WeekViewState<T extends Object?> extends State<WeekView<T>> {
     _minDate = (widget.minDay ?? CalendarConstants.epochDate)
         .firstDayOfWeek(start: widget.startDay)
         .withoutTime;
-
     _maxDate = (widget.maxDay ?? CalendarConstants.maxDate)
         .lastDayOfWeek(start: widget.startDay)
         .withoutTime;
@@ -781,7 +786,11 @@ class WeekViewState<T extends Object?> extends State<WeekView<T>> {
   }
 
   /// Default builder for week number.
+  // TODO(Shubham): Update for 3 day view
   Widget _defaultWeekNumberBuilder(DateTime date) {
+    if (widget.showThreeDayView) {
+      return SizedBox.shrink();
+    }
     final daysToAdd = DateTime.thursday - date.weekday;
     final thursday = daysToAdd > 0
         ? date.add(Duration(days: daysToAdd))
@@ -886,9 +895,9 @@ class WeekViewState<T extends Object?> extends State<WeekView<T>> {
         _currentStartDate = DateTime(
           _currentStartDate.year,
           _currentStartDate.month,
-          _currentStartDate.day + (index - _currentIndex) * 7,
+          _currentStartDate.day + (index - _currentIndex) * 3,
         );
-        _currentEndDate = _currentStartDate.add(Duration(days: 6));
+        _currentEndDate = _currentStartDate.add(Duration(days: 2));
         _currentIndex = index;
       });
     }