feat: change layout WIP

src/Ursa/Controls/DateTimePicker/CalendarMonthView.cs

@@ -0,0 +1,49 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Metadata;
+using Avalonia.Controls.Primitives;
+
+namespace Ursa.Controls;
+
+/// <summary>
+/// Show days in a month. 
+/// </summary>
+[TemplatePart(PART_Grid, typeof(Grid))]
+public class CalendarMonthView: TemplatedControl
+{
+    public const string PART_Grid = "PART_Grid";
+    
+    private Grid? _grid;
+    protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+    {
+        base.OnApplyTemplate(e);
+        _grid = e.NameScope.Find<Grid>(PART_Grid);
+        // GenerateGridElements();
+    }
+    
+    private int _month;
+    public int Month
+    {
+        get => _month;
+        set
+        {
+            _month = value;
+            // Update();
+        }
+    }
+
+    public static readonly StyledProperty<DayOfWeek> FirstDayOfWeekProperty = AvaloniaProperty.Register<CalendarMonthView, DayOfWeek>(
+        nameof(FirstDayOfWeek));
+
+    public DayOfWeek FirstDayOfWeek
+    {
+        get => GetValue(FirstDayOfWeekProperty);
+        set => SetValue(FirstDayOfWeekProperty, value);
+    }
+
+    private void GenerateGridElements()
+    {
+        // Generate Day titles (Sun, Mon, Tue, Wed, Thu, Fri, Sat) based on FirstDayOfWeek and culture.
+        
+    }
+}