feat: move state out of calendar display.

src/Ursa/Controls/DateTimePicker/CalendarDisplayControl.cs

@@ -31,11 +31,13 @@ public class CalendarDisplayControl: TemplatedControl
 
     private CalendarMonthView? _monthView;
     private CalendarYearView? _yearView;
-    private DatePickerState _state = DatePickerState.None;
     private Button? _yearButton;
     private Button? _monthButton;
     private Button? _headerButton;
     
+    public event EventHandler<CalendarDayButtonEventArgs>? OnDateSelected;
+    public event EventHandler<CalendarDayButtonEventArgs>? OnDatePreviewed;
+    
     
     public static readonly StyledProperty<DateTime> SelectedDateProperty = AvaloniaProperty.Register<CalendarDisplayControl, DateTime>(nameof(SelectedDate), DateTime.Now);
     public DateTime SelectedDate
@@ -164,53 +166,15 @@ public class CalendarDisplayControl: TemplatedControl
             _yearView?.ContextDate.Year + "-" + (_yearView?.ContextDate.Year + 10));
         _yearView?.UpdateMode(CalendarYearViewMode.Year);
         SetCurrentValue(IsMonthModeProperty, false);
-        
     }
 
-    private void OnDatePreviewed(object sender, CalendarDayButtonEventArgs e)
+    private void OnMonthViewDatePreviewed(object sender, CalendarDayButtonEventArgs e)
     {
-        if(_monthView is null)
+        OnDatePreviewed?.Invoke(sender, e);
-        {
-            return;
-        }
-        var date = e.Date;
-        if (_state is DatePickerState.None) return;
-        if (_state == DatePickerState.PreviewStart)
-        {
-            _monthView.MarkPreview(date, EndDate);
-        }
-        else if (_state == DatePickerState.PreviewEnd)
-        {
-            _monthView.MarkPreview(StartDate, date);
-        }
     }
 
-    private void OnDateSelected(object sender, CalendarDayButtonEventArgs e)
+    private void OnMonthViewDateSelected(object sender, CalendarDayButtonEventArgs e)
     {
-        if(_monthView is null)
+        OnDateSelected?.Invoke(sender, e);
-        {
-            return;
-        }
-        var date = e.Date;
-        if (_state == DatePickerState.None)
-        {
-            _monthView.ClearSelection();
-            _monthView.ClearPreview();
-            _monthView.MarkSelection(date, null);
-            _state = DatePickerState.PreviewEnd;
-            StartDate = date;
-        }
-        else if (_state == DatePickerState.PreviewStart)
-        {
-            _monthView.MarkSelection(date, EndDate);
-            _state = DatePickerState.SelectStart;
-            StartDate = date;
-        }
-        else if (_state == DatePickerState.PreviewEnd)
-        {
-            _monthView.MarkSelection(StartDate, date);
-            _state = DatePickerState.None;
-            EndDate = date;
-        }
     }
 }

src/Ursa/Controls/DateTimePicker/CalendarMonthView.cs

@@ -180,43 +180,6 @@ public class CalendarMonthView : TemplatedControl
         }
     }
 
-    [Obsolete]
-    public void MarkSelection(DateTime? start, DateTime? end)
-    {
-        if (_grid?.Children is null) return;
-        foreach (var child in _grid.Children)
-            if (child is CalendarDayButton { DataContext: DateTime d } button)
-            {
-                if (d.Month != _contextDate.Month) continue;
-                if (d == start)
-                {
-                    button.IsStartDate = true;
-                    button.IsPreviewStartDate = false;
-                    button.IsEndDate = false;
-                    button.IsInRange = false;
-                }
-                else if (d == end)
-                {
-                    button.IsEndDate = true;
-                    button.IsPreviewEndDate = false;
-                    button.IsStartDate = false;
-                    button.IsInRange = false;
-                }
-                else if (d > start && d < end)
-                {
-                    button.IsInRange = true;
-                    button.IsStartDate = false;
-                    button.IsEndDate = false;
-                }
-                else
-                {
-                    button.IsStartDate = false;
-                    button.IsEndDate = false;
-                    button.IsInRange = false;
-                }
-            }
-    }
-
     public void MarkPreview(DateTime? start, DateTime? end)
     {
         if (_grid?.Children is null) return;
@@ -273,18 +236,4 @@ public class CalendarMonthView : TemplatedControl
             button.IsInRange = false;
         }
     }
-
-    public void MarkSelection(DateTime date)
-    {
-        if (_grid?.Children is null) return;
-        foreach (var child in _grid.Children)
-        {
-            if (child is not CalendarDayButton { DataContext: DateTime d } button) continue;
-            button.IsStartDate = false;
-            button.IsEndDate = false;
-            button.IsInRange = false;
-            if (d.Month != _contextDate.Month) continue;
-            button.IsSelected = d == date;
-        }
-    }
 }

src/Ursa/Controls/DateTimePicker/DateRangePicker.cs

@@ -0,0 +1,8 @@
+using Avalonia.Controls.Primitives;
+
+namespace Ursa.Controls;
+
+public class DateRangePicker : TemplatedControl
+{
+    
+}