feat: simplify mechanism.

demo/Ursa.Demo/Pages/DatePickerDemo.axaml

@@ -6,7 +6,7 @@
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
              x:Class="Ursa.Demo.Pages.DatePickerDemo">
     <StackPanel Margin="20" HorizontalAlignment="Left">
-        <u:CalendarView OnDateSelected="CalendarView_OnOnDateSelected" OnDatePreviewed="CalendarView_OnOnDatePreviewed"/>
+        <u:CalendarView DateSelected="CalendarView_OnOnDateSelected" DatePreviewed="CalendarView_OnOnDatePreviewed"/>
         <TextBlock Text="{Binding #singlePicker.SelectedDate}" ></TextBlock>
         <u:DatePicker Name="singlePicker" Width="200"  />
         <u:DateRangePicker Width="300" DisplayFormat="yyyyMMdd" />

src/Ursa/Controls/DateTimePicker/CalendarContext.cs

@@ -1,21 +1,67 @@
 namespace Ursa.Controls;
 
-public class CalendarContext(int? year = null, int? month = null, int? day = null)
+public sealed class CalendarContext(int? year = null, int? month = null, int? startYear = null, int? endYear = null)
 {
-    public int? Year = year;
+    public int? Year { get; } = year;
-    public int? Month = month;
+    public int? Month { get; } = month;
-    public int? Day = day;
+    public int? StartYear { get; } = startYear;
-    public int? StartYear;
+    public int? EndYear { get; } = endYear;
-    public int? EndYear;
 
 
     public CalendarContext Clone()
     {
-        return new CalendarContext(Year, Month, Day) { StartYear = StartYear, EndYear = EndYear };
+        return new CalendarContext(Year, Month, StartYear, EndYear);
     }
 
     public static CalendarContext Today()
     {
-        return new CalendarContext(DateTime.Today.Year, DateTime.Today.Month, 1);
+        return new CalendarContext(DateTime.Today.Year, DateTime.Today.Month);
+    }
+
+    public CalendarContext With(int? year = null, int? month = null, int? startYear = null, int? endYear = null)
+    {
+        return new CalendarContext(year ?? Year, month ?? Month, startYear ?? StartYear, endYear ?? EndYear);
+    }
+
+    public CalendarContext NextMonth()
+    {
+        var year = Year;
+        var month = Month;
+        if (month == 12)
+        {
+            year++;
+            month = 1;
+        }
+        else
+        {
+            month++;
+        }
+        return new CalendarContext(year, month, StartYear, EndYear);
+    }
+
+    public CalendarContext PreviousMonth()
+    {
+        var year = Year;
+        var month = Month;
+        if (month == 1)
+        {
+            year--;
+            month = 12;
+        }
+        else
+        {
+            month--;
+        }
+        return new CalendarContext(year, month, StartYear, EndYear);
+    }
+
+    public CalendarContext NextYear()
+    {
+        return new CalendarContext(Year + 1, Month, StartYear, EndYear);
+    }
+
+    public CalendarContext PreviousYear()
+    {
+        return new CalendarContext(Year - 1, Month, StartYear, EndYear);
     }
 }

src/Ursa/Controls/DateTimePicker/CalendarView.cs

@@ -75,6 +75,15 @@ public class CalendarView : TemplatedControl
         {
             view.PseudoClasses.Set(PC_Month, args.NewValue.Value == CalendarViewMode.Month);
         });
+        ContextDateProperty.Changed.AddClassHandler<CalendarView, CalendarContext>((view, args) =>
+            view.OnContextDateChanged(args));
+    }
+
+    private void OnContextDateChanged(AvaloniaPropertyChangedEventArgs<CalendarContext> args)
+    {
+        ContextDateChanged?.Invoke(this, args.NewValue.Value);
+        //UpdateDayButtons();
+        //UpdateYearButtons();
     }
 
     internal CalendarViewMode Mode
@@ -83,7 +92,16 @@ public class CalendarView : TemplatedControl
         set => SetAndRaise(ModeProperty, ref _mode, value);
     }
 
-    public CalendarContext ContextCalendar { get; set; } = new();
+    private CalendarContext _contextDate = new();
+
+    public static readonly DirectProperty<CalendarView, CalendarContext> ContextDateProperty = AvaloniaProperty.RegisterDirect<CalendarView, CalendarContext>(
+        nameof(ContextDate), o => o.ContextDate, (o, v) => o.ContextDate = v);
+
+    public CalendarContext ContextDate
+    {
+        get => _contextDate;
+        internal set => SetAndRaise(ContextDateProperty, ref _contextDate, value);
+    }
 
     public bool IsTodayHighlighted
     {
@@ -97,8 +115,9 @@ public class CalendarView : TemplatedControl
         set => SetValue(FirstDayOfWeekProperty, value);
     }
 
-    public event EventHandler<CalendarDayButtonEventArgs>? OnDateSelected;
+    public event EventHandler<CalendarDayButtonEventArgs>? DateSelected;
-    public event EventHandler<CalendarDayButtonEventArgs>? OnDatePreviewed;
+    public event EventHandler<CalendarDayButtonEventArgs>? DatePreviewed;
+    internal event EventHandler<CalendarContext>? ContextDateChanged; 
 
     private void OnFirstDayOfWeekChanged(AvaloniaPropertyChangedEventArgs<DayOfWeek> args)
     {
@@ -136,7 +155,7 @@ public class CalendarView : TemplatedControl
         Button.ClickEvent.AddHandler(OnNext, _nextButton);
         Button.ClickEvent.AddHandler(OnFastNext, _fastNextButton);
 
-        ContextCalendar = new CalendarContext(DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day);
+        ContextDate = new CalendarContext(DateTime.Today.Year, DateTime.Today.Month);
         PseudoClasses.Set(PC_Month, Mode == CalendarViewMode.Month);
         InitializeGridButtons();
         UpdateDayButtons();
@@ -147,7 +166,7 @@ public class CalendarView : TemplatedControl
     {
         if (Mode == CalendarViewMode.Month)
         {
-            ContextCalendar.Year += 1;
+            ContextDate = ContextDate.With(year: ContextDate.Year + 1);
             UpdateDayButtons();
         }
     }
@@ -156,30 +175,22 @@ public class CalendarView : TemplatedControl
     {
         if (Mode == CalendarViewMode.Month)
         {
-            ContextCalendar.Month += 1;
+            ContextDate = ContextDate.NextMonth();
-            if (ContextCalendar.Month > 12)
-            {
-                ContextCalendar.Month = 1;
-                ContextCalendar.Year += 1;
-            }
-
             UpdateDayButtons();
         }
         else if (Mode == CalendarViewMode.Year)
         {
-            ContextCalendar.Year += 1;
+            ContextDate = ContextDate.NextYear();
             UpdateYearButtons();
         }
         else if (Mode == CalendarViewMode.Decade)
         {
-            ContextCalendar.StartYear += 10;
+            ContextDate = ContextDate.With(startYear: ContextDate.StartYear + 10, endYear: ContextDate.EndYear + 10);
-            ContextCalendar.EndYear += 10;
             UpdateYearButtons();
         }
         else if (Mode == CalendarViewMode.Century)
         {
-            ContextCalendar.StartYear += 100;
+            ContextDate = ContextDate.With(startYear: ContextDate.StartYear + 100, endYear: ContextDate.EndYear + 100);
-            ContextCalendar.EndYear += 100;
             UpdateYearButtons();
         }
     }
@@ -188,30 +199,22 @@ public class CalendarView : TemplatedControl
     {
         if (Mode == CalendarViewMode.Month)
         {
-            ContextCalendar.Month -= 1;
+            ContextDate = ContextDate.PreviousMonth();
-            if (ContextCalendar.Month < 1)
-            {
-                ContextCalendar.Month = 12;
-                ContextCalendar.Year -= 1;
-            }
-
             UpdateDayButtons();
         }
         else if (Mode == CalendarViewMode.Year)
         {
-            ContextCalendar.Year -= 1;
+            ContextDate = ContextDate.With(year: ContextDate.Year - 1);
             UpdateYearButtons();
         }
         else if (Mode == CalendarViewMode.Decade)
         {
-            ContextCalendar.StartYear -= 10;
+            ContextDate = ContextDate.With(startYear: ContextDate.StartYear - 10, endYear: ContextDate.EndYear - 10);
-            ContextCalendar.EndYear -= 10;
             UpdateYearButtons();
         }
         else if (Mode == CalendarViewMode.Century)
         {
-            ContextCalendar.StartYear -= 100;
+            ContextDate = ContextDate.With(startYear: ContextDate.StartYear - 100, endYear: ContextDate.EndYear - 100);
-            ContextCalendar.EndYear -= 100;
             UpdateYearButtons();
         }
     }
@@ -220,7 +223,7 @@ public class CalendarView : TemplatedControl
     {
         if (Mode == CalendarViewMode.Month)
         {
-            ContextCalendar.Year -= 1;
+            ContextDate = ContextDate.PreviousYear();
             UpdateDayButtons();
         }
     }
@@ -237,9 +240,8 @@ public class CalendarView : TemplatedControl
         if (Mode == CalendarViewMode.Year)
         {
             Mode = CalendarViewMode.Decade;
-            var range = DateTimeHelper.GetDecadeViewRangeByYear(ContextCalendar.Year!.Value);
+            var range = DateTimeHelper.GetDecadeViewRangeByYear(ContextDate.Year!.Value);
-            ContextCalendar.StartYear = range.start;
+            ContextDate =  ContextDate.With(startYear: range.start, endYear: range.end);
-            ContextCalendar.EndYear = range.end;
             UpdateYearButtons();
             return;
         }
@@ -247,9 +249,8 @@ public class CalendarView : TemplatedControl
         if (Mode == CalendarViewMode.Decade)
         {
             Mode = CalendarViewMode.Century;
-            var range = DateTimeHelper.GetCenturyViewRangeByYear(ContextCalendar.StartYear!.Value);
+            var range = DateTimeHelper.GetCenturyViewRangeByYear(ContextDate.StartYear!.Value);
-            ContextCalendar.StartYear = range.start;
+            ContextDate = ContextDate.With(startYear: range.start, endYear: range.end);
-            ContextCalendar.EndYear = range.end;
             UpdateYearButtons();
             return;
         }
@@ -309,7 +310,7 @@ public class CalendarView : TemplatedControl
         if (_monthGrid is null || Mode != CalendarViewMode.Month) return;
         var children = _monthGrid.Children;
         var info = DateTimeHelper.GetCurrentDateTimeFormatInfo();
-        var date = new DateTime(ContextCalendar.Year.Value, ContextCalendar.Month.Value, ContextCalendar.Day.Value);
+        var date = new DateTime(ContextDate.Year.Value, ContextDate.Month.Value, 1);
         var dayBefore = PreviousMonthDays(date);
         var dateToSet = date.GetFirstDayOfMonth().AddDays(-dayBefore);
         for (var i = 7; i < children.Count; i++)
@@ -332,7 +333,7 @@ public class CalendarView : TemplatedControl
     {
         if (_yearGrid is null) return;
         var mode = Mode;
-        var contextDate = ContextCalendar;
+        var contextDate = ContextDate;
         if (mode == CalendarViewMode.Century && contextDate.StartYear.HasValue)
         {
             var range = DateTimeHelper.GetCenturyViewRangeByYear(contextDate.StartYear.Value);
@@ -341,7 +342,7 @@ public class CalendarView : TemplatedControl
             {
                 var child = _yearGrid.Children[i] as CalendarYearButton;
                 child?.SetContext(CalendarViewMode.Century,
-                    new CalendarContext { StartYear = start, EndYear = start + 10 });
+                    new CalendarContext(startYear: start, endYear: start + 10));
                 start += 10;
             }
         }
@@ -353,7 +354,7 @@ public class CalendarView : TemplatedControl
             {
                 var child = _yearGrid.Children[i] as CalendarYearButton;
                 child?.SetContext(CalendarViewMode.Decade,
-                    new CalendarContext { Year = year });
+                    new CalendarContext(year: year));
                 year++;
             }
         }
@@ -362,7 +363,7 @@ public class CalendarView : TemplatedControl
             for (var i = 0; i < 12; i++)
             {
                 var child = _yearGrid.Children[i] as CalendarYearButton;
-                child?.SetContext(CalendarViewMode.Year, new CalendarContext { Month = i+1 });
+                child?.SetContext(CalendarViewMode.Year, new CalendarContext(month: i + 1));
             }
         }
         UpdateHeaderButtons();
@@ -374,7 +375,7 @@ public class CalendarView : TemplatedControl
         var children = _monthGrid.Children;
         for (var i = 7; i < children.Count; i++)
             if (children[i] is CalendarDayButton { DataContext: DateTime d } button)
-                button.IsNotCurrentMonth = d.Month != ContextCalendar.Month;
+                button.IsNotCurrentMonth = d.Month != ContextDate.Month;
     }
 
     private void UpdateMonthViewHeader(DayOfWeek day)
@@ -404,20 +405,17 @@ public class CalendarView : TemplatedControl
 
     private void OnCellDatePreviewed(object sender, CalendarDayButtonEventArgs e)
     {
-        OnDatePreviewed?.Invoke(this, e);
+        DatePreviewed?.Invoke(this, e);
     }
 
     private void OnCellDateSelected(object sender, CalendarDayButtonEventArgs e)
     {
-        if (e.Date.HasValue && e.Date.Value.Month != ContextCalendar.Month)
+        if (e.Date.HasValue && e.Date.Value.Month != ContextDate.Month)
         {
-            ContextCalendar.Month = e.Date.Value.Month;
+            ContextDate = ContextDate.With(year: e.Date.Value.Year, month: e.Date.Value.Month);
-            ContextCalendar.Year = e.Date.Value.Year;
-            ContextCalendar.Day = 1;
             UpdateDayButtons();
         }
-
+        DateSelected?.Invoke(this, e);
-        OnDateSelected?.Invoke(this, e);
     }
 
     /// <summary>
@@ -440,9 +438,8 @@ public class CalendarView : TemplatedControl
     {
         if (_yearGrid is null) return;
         SetCurrentValue(ModeProperty, CalendarViewMode.Decade);
-        var range = DateTimeHelper.GetDecadeViewRangeByYear(ContextCalendar.Year!.Value);
+        var range = DateTimeHelper.GetDecadeViewRangeByYear(ContextDate.Year!.Value);
-        ContextCalendar.StartYear = range.start;
+        ContextDate = ContextDate.With(startYear: range.start, endYear: range.end);
-        ContextCalendar.EndYear = range.end;
         UpdateYearButtons();
     }
 
@@ -463,31 +460,23 @@ public class CalendarView : TemplatedControl
         if (Mode == CalendarViewMode.Century)
         {
             Mode = CalendarViewMode.Decade;
-            ContextCalendar.Year = null;
+            ContextDate = e.Context.With(year: null);
-            ContextCalendar.StartYear = e.Context.StartYear;
-            ContextCalendar.EndYear = e.Context.EndYear;
         }
         else if (Mode == CalendarViewMode.Decade)
         {
             Mode = CalendarViewMode.Year;
-            ContextCalendar.Year = e.Context.Year;
+            ContextDate = e.Context.Clone();
-            ContextCalendar.StartYear = e.Context.StartYear;
-            ContextCalendar.EndYear = e.Context.EndYear;
         }
         else if (Mode == CalendarViewMode.Year)
         {
             Mode = CalendarViewMode.Month;
-            ContextCalendar.StartYear = null;
+            ContextDate = ContextDate.With(null, e.Context.Month, null, null);
-            ContextCalendar.EndYear = null;
-            // ContextCalendar.Year = e.Context.Year;
-            ContextCalendar.Month = e.Context.Month;
             UpdateDayButtons();
         }
         else if (Mode == CalendarViewMode.Month)
         {
-            throw new NotImplementedException();
+            return;
         }
-
         UpdateHeaderButtons();
         UpdateYearButtons();
     }
@@ -500,7 +489,7 @@ public class CalendarView : TemplatedControl
             IsVisibleProperty.SetValue(false, _yearButton, _monthButton, _monthGrid, _fastPreviousButton,
                 _fastNextButton);
             _headerButton?.SetValue(ContentControl.ContentProperty,
-                ContextCalendar.StartYear + "-" + ContextCalendar.EndYear);
+                ContextDate.StartYear + "-" + ContextDate.EndYear);
         }
         else if (Mode == CalendarViewMode.Decade)
         {
@@ -508,14 +497,14 @@ public class CalendarView : TemplatedControl
             IsVisibleProperty.SetValue(false, _yearButton, _monthButton, _monthGrid, _fastPreviousButton,
                 _fastNextButton);
             _headerButton?.SetValue(ContentControl.ContentProperty,
-                ContextCalendar.StartYear + "-" + ContextCalendar.EndYear);
+                ContextDate.StartYear + "-" + ContextDate.EndYear);
         }
         else if (Mode == CalendarViewMode.Year)
         {
             IsVisibleProperty.SetValue(true, _headerButton, _yearGrid);
             IsVisibleProperty.SetValue(false, _yearButton, _monthButton, _monthGrid, _fastPreviousButton,
                 _fastNextButton);
-            _headerButton?.SetValue(ContentControl.ContentProperty, ContextCalendar.Year);
+            _headerButton?.SetValue(ContentControl.ContentProperty, ContextDate.Year);
         }
         else if (Mode == CalendarViewMode.Month)
         {
@@ -523,13 +512,13 @@ public class CalendarView : TemplatedControl
             IsVisibleProperty.SetValue(true, _yearButton, _monthButton, _monthGrid, _fastPreviousButton,
                 _fastNextButton);
             // _headerButton?.SetValue(ContentControl.ContentProperty, ContextCalendar.Year);
-            _yearButton?.SetValue(ContentControl.ContentProperty, ContextCalendar.Year);
+            _yearButton?.SetValue(ContentControl.ContentProperty, ContextDate.Year);
             _monthButton?.SetValue(ContentControl.ContentProperty,
-                DateTimeHelper.GetCurrentDateTimeFormatInfo().AbbreviatedMonthNames[ContextCalendar.Month-1 ?? 0]);
+                DateTimeHelper.GetCurrentDateTimeFormatInfo().AbbreviatedMonthNames[ContextDate.Month-1 ?? 0]);
         }
 
-        bool canForward = !(ContextCalendar.EndYear <= 0) && !(ContextCalendar.Year <= 0);
+        bool canForward = !(ContextDate.EndYear <= 0) && !(ContextDate.Year <= 0);
-        bool canNext = !(ContextCalendar.StartYear > 9999) && !(ContextCalendar.EndYear > 9999);
+        bool canNext = !(ContextDate.StartYear > 9999) && !(ContextDate.EndYear > 9999);
         IsEnabledProperty.SetValue(canForward, _previousButton, _fastPreviousButton);
         IsEnabledProperty.SetValue(canNext, _nextButton, _fastNextButton);
     }
@@ -551,7 +540,7 @@ public class CalendarView : TemplatedControl
         {
             if (child is not CalendarDayButton { DataContext: DateTime d } button) continue;
             button.ResetSelection();
-            if(d.Month != ContextCalendar.Month) continue;
+            if(d.Month != ContextDate.Month) continue;
             if (d < rangeEnd && d > rangeStart) button.IsInRange = true;
             if (d == previewStart) button.IsPreviewStartDate = true;
             if (d == previewEnd) button.IsPreviewEndDate = true;
@@ -580,6 +569,6 @@ public class CalendarView : TemplatedControl
     protected override void OnPointerExited(PointerEventArgs e)
     {
         base.OnPointerExited(e);
-        OnDatePreviewed?.Invoke(this, new CalendarDayButtonEventArgs(null));
+        DatePreviewed?.Invoke(this, new CalendarDayButtonEventArgs(null));
     }
 }

src/Ursa/Controls/DateTimePicker/CalendarViewMode.cs

@@ -6,8 +6,8 @@ internal enum CalendarViewMode
     Month,
     // Show Months in current year.
     Year,
-    // The button represents 10(12) years. 
+    // The button represents 1 years. 
     Decade,
-    // The button represents 100(120) years.
+    // The button represents 10 years.
     Century,
 }

src/Ursa/Controls/DateTimePicker/CalendarYearButton.cs

@@ -35,10 +35,6 @@ public class CalendarYearButton : ContentControl
     internal void SetContext(CalendarViewMode mode, CalendarContext context)
     {
         CalendarContext = context.Clone();
-        CalendarContext.Month = context.Month;
-        CalendarContext.Year = context.Year;
-        CalendarContext.StartYear = context.StartYear;
-        CalendarContext.EndYear = context.EndYear;
         Mode = mode;
         switch (Mode)
         {

src/Ursa/Controls/DateTimePicker/DatePicker.cs

@@ -73,7 +73,7 @@ public class DatePicker: DatePickerBase, IClearControl
         Button.ClickEvent.RemoveHandler(OnButtonClick, _button);
         if (_calendar != null)
         {
-            _calendar.OnDateSelected -= OnDateSelected;
+            _calendar.DateSelected -= OnDateSelected;
         }
         
         _button = e.NameScope.Find<Button>(PART_Button);
@@ -88,7 +88,7 @@ public class DatePicker: DatePickerBase, IClearControl
         
         if (_calendar != null)
         {
-            _calendar.OnDateSelected += OnDateSelected;
+            _calendar.DateSelected += OnDateSelected;
         }
     }
 
@@ -109,7 +109,7 @@ public class DatePicker: DatePickerBase, IClearControl
         if (_calendar is not null)
         {
             var date = SelectedDate ?? DateTime.Today;
-            _calendar.ContextCalendar = new CalendarContext(date.Year, date.Month, 1);
+            _calendar.ContextDate = new CalendarContext(date.Year, date.Month);
             _calendar.UpdateDayButtons();
         }
         SetCurrentValue(IsDropdownOpenProperty, true);
@@ -139,7 +139,7 @@ public class DatePicker: DatePickerBase, IClearControl
                 if (_calendar is not null)
                 {
                     var d = SelectedDate ?? DateTime.Today;
-                    _calendar.ContextCalendar = new CalendarContext(date.Year, date.Month, 1);
+                    _calendar.ContextDate = new CalendarContext(date.Year, date.Month);
                     _calendar.UpdateDayButtons();
                 }
                 _calendar?.MarkDates(startDate: date, endDate: date);
@@ -152,7 +152,7 @@ public class DatePicker: DatePickerBase, IClearControl
         if (_calendar is not null)
         {
             var date = SelectedDate ?? DateTime.Today;
-            _calendar.ContextCalendar = new CalendarContext(date.Year, date.Month, 1);
+            _calendar.ContextDate = new CalendarContext(date.Year, date.Month);
             _calendar.UpdateDayButtons();
         }
         SetCurrentValue(IsDropdownOpenProperty, true);

src/Ursa/Controls/DateTimePicker/DateRangePicker.cs

@@ -101,13 +101,13 @@ public class DateRangePicker : DatePickerBase
         Button.ClickEvent.RemoveHandler(OnButtonClick, _button);
         if (_startCalendar != null)
         {
-            _startCalendar.OnDateSelected -= OnDateSelected;
+            _startCalendar.DateSelected -= OnDateSelected;
-            _startCalendar.OnDatePreviewed -= OnDatePreviewed;
+            _startCalendar.DatePreviewed -= OnDatePreviewed;
         }
         if (_endCalendar != null)
         {
-            _endCalendar.OnDateSelected -= OnDateSelected;
+            _endCalendar.DateSelected -= OnDateSelected;
-            _endCalendar.OnDatePreviewed -= OnDatePreviewed;
+            _endCalendar.DatePreviewed -= OnDatePreviewed;
         }
         _button = e.NameScope.Find<Button>(PART_Button);
         _popup = e.NameScope.Find<Popup>(PART_Popup);
@@ -123,13 +123,13 @@ public class DateRangePicker : DatePickerBase
         
         if (_startCalendar != null)
         {
-            _startCalendar.OnDateSelected += OnDateSelected;
+            _startCalendar.DateSelected += OnDateSelected;
-            _startCalendar.OnDatePreviewed += OnDatePreviewed;
+            _startCalendar.DatePreviewed += OnDatePreviewed;
         }
         if (_endCalendar != null)
         {
-            _endCalendar.OnDateSelected += OnDateSelected;
+            _endCalendar.DateSelected += OnDateSelected;
-            _endCalendar.OnDatePreviewed += OnDatePreviewed;
+            _endCalendar.DatePreviewed += OnDatePreviewed;
         }
     }
 
@@ -211,7 +211,7 @@ public class DateRangePicker : DatePickerBase
             if (_startCalendar is not null)
             {
                 var date = SelectedStartDate ?? DateTime.Today;
-                _startCalendar.ContextCalendar = new CalendarContext(date.Year, date.Month, 1);
+                _startCalendar.ContextDate = new CalendarContext(date.Year, date.Month);
                 _startCalendar.UpdateDayButtons();
             }
 
@@ -223,7 +223,7 @@ public class DateRangePicker : DatePickerBase
                     date2 = SelectedStartDate ?? DateTime.Today;
                     date2 = date2.Value.AddMonths(1);
                 }
-                _endCalendar.ContextCalendar = new CalendarContext(date2?.Year, date2?.Month, 1);
+                _endCalendar.ContextDate = new CalendarContext(date2?.Year, date2?.Month);
                 _endCalendar.UpdateDayButtons();
             }
         }
@@ -233,7 +233,7 @@ public class DateRangePicker : DatePickerBase
             if (_endCalendar is not null)
             {
                 var date = SelectedEndDate ?? DateTime.Today;
-                _endCalendar.ContextCalendar = new CalendarContext(date.Year, date.Month, 1);
+                _endCalendar.ContextDate = new CalendarContext(date.Year, date.Month);
                 _endCalendar.UpdateDayButtons();
             }
             if (_startCalendar is not null)
@@ -244,7 +244,7 @@ public class DateRangePicker : DatePickerBase
                     date2 = SelectedStartDate ?? DateTime.Today;
                     date2 = date2.Value.AddMonths(-1);
                 }
-                _startCalendar.ContextCalendar = new CalendarContext(date2?.Year, date2?.Month, 1);
+                _startCalendar.ContextDate = new CalendarContext(date2?.Year, date2?.Month);
                 _startCalendar.UpdateDayButtons();
             }
             
@@ -290,14 +290,14 @@ public class DateRangePicker : DatePickerBase
                 if (_startCalendar is not null)
                 {
                     var date1 = SelectedStartDate ?? DateTime.Today;
-                    _startCalendar.ContextCalendar = new CalendarContext(date1.Year, date.Month, 1);
+                    _startCalendar.ContextDate = new CalendarContext(date1.Year, date.Month);
                     _startCalendar.UpdateDayButtons();
                     _startCalendar?.MarkDates(SelectedStartDate, SelectedEndDate, _previewStart, _previewEnd);
                 }
                 if (_endCalendar is not null)
                 {
                     var date2 = SelectedEndDate ?? DateTime.Today;
-                    _endCalendar.ContextCalendar = new CalendarContext(date2.Year, date2.Month, 1);
+                    _endCalendar.ContextDate = new CalendarContext(date2.Year, date2.Month);
                     _endCalendar.UpdateDayButtons();
                     _endCalendar?.MarkDates(SelectedStartDate, SelectedEndDate, _previewStart, _previewEnd);
                 }
@@ -310,16 +310,16 @@ public class DateRangePicker : DatePickerBase
         if (_startCalendar is not null)
         {
             var date = SelectedStartDate ?? DateTime.Today;
-            _startCalendar.ContextCalendar = new CalendarContext(date.Year, date.Month, 1);
+            _startCalendar.ContextDate = new CalendarContext(date.Year, date.Month);
-            _startCalendar.UpdateDayButtons();
+            // _startCalendar.UpdateDayButtons();
         }
 
         if (_endCalendar is not null)
         {
             var date2 = SelectedStartDate ?? DateTime.Today;
             date2 = date2.AddMonths(1);
-            _endCalendar.ContextCalendar = new CalendarContext(date2.Year, date2.Month, 1);
+            _endCalendar.ContextDate = new CalendarContext(date2.Year, date2.Month);
-            _endCalendar.UpdateDayButtons();
+            // _endCalendar.UpdateDayButtons();
         }
         SetCurrentValue(IsDropdownOpenProperty, true);
     }