Fixed the display date of the calendar items. Created test project for core library, included tests for recurring calendar events.

Wino.Mail.WinUI/Controls/Calendar/CalendarItemControl.xaml

@@ -64,7 +64,7 @@
         <StackPanel
             x:Name="AttributeStack"
             Grid.Column="1"
-            Margin="0,4,0,0"
+            Margin="0,4,4,0"
             HorizontalAlignment="Right"
             VerticalAlignment="Top"
             Orientation="Horizontal"

Wino.Mail.WinUI/Controls/Calendar/CalendarItemControl.xaml.cs

@@ -1,9 +1,11 @@
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.Messaging;
+using CommunityToolkit.WinUI;
 using Itenso.TimePeriod;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
 using Microsoft.UI.Xaml.Input;
+using Microsoft.UI.Xaml.Media;
 using Wino.Calendar.ViewModels.Data;
 using Wino.Calendar.ViewModels.Messages;
 using Wino.Core.Domain;

Wino.Mail.WinUI/Controls/Calendar/UniformItemsControl.cs

@@ -0,0 +1,85 @@
+using System.Collections.Generic;
+using CommunityToolkit.WinUI;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Wino.Calendar.Controls;
+using Wino.Core.Domain.Models.Calendar;
+
+namespace Wino.Mail.WinUI.Controls.Calendar;
+
+/// <summary>
+/// AOT-Safe ItemsControl for use in UniformGrid panels.
+/// </summary>
+///
+public partial class UniformItemsControl : Grid
+{
+    [GeneratedDependencyProperty]
+    public partial DayRangeRenderModel? RenderModel { get; set; }
+
+    [GeneratedDependencyProperty]
+    public partial List<CalendarDayModel>? ItemsSource { get; set; }
+
+    partial void OnRenderModelChanged(DayRangeRenderModel? newValue)
+    {
+        if (newValue == null || ItemsSource == null) return;
+
+        AdjustColumns();
+    }
+
+    partial void OnItemsSourceChanged(List<CalendarDayModel>? newValue)
+    {
+        if (newValue == null || ItemsSource == null) return;
+
+        AdjustColumns();
+    }
+
+    private void AdjustColumns()
+    {
+        if (RenderModel == null || ItemsSource == null) return;
+
+        Children.Clear();
+        ColumnDefinitions.Clear();
+
+        var columns = RenderModel.TotalDays;
+
+        // First divide.
+        for (int i = 0; i < columns; i++)
+        {
+            ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
+        }
+
+        // Then add items.
+        for (int i = 0; i < columns; i++)
+        {
+            var item = ItemsSource[i];
+
+            var control = new DayColumnControl()
+            {
+                DayModel = item
+            };
+
+            SetColumn(control, i);
+            Children.Add(control);
+        }
+    }
+}
+//public partial class UniformItemsControl : ItemsControl
+//{
+//    private const string ControlUniformGridName = "PART_UniformGrid";
+
+//    [GeneratedDependencyProperty]
+//    public partial DayRangeRenderModel? RenderModel { get; set; }
+
+//    partial void OnRenderModelChanged(DayRangeRenderModel? newValue)
+//    {
+//        if (newValue == null) return;
+
+//        // Adjust the ItemsPanel based on the RenderModel's columns.
+//        var uniGrid = WinoVisualTreeHelper.FindDescendants<UniformGrid>(this);
+
+//        //if (uniGrid != null)
+//        //{
+//        //    uniGrid.Columns = newValue.TotalDays;
+//        //}
+//    }
+//}

Wino.Mail.WinUI/Controls/Calendar/WinoDayTimelineCanvas.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Diagnostics;
+using System.Linq;
+using CommunityToolkit.WinUI;
 using Microsoft.Graphics.Canvas.Geometry;
 using Microsoft.Graphics.Canvas.UI.Xaml;
 using Microsoft.UI.Input;
@@ -110,6 +112,11 @@ public partial class WinoDayTimelineCanvas : Control, IDisposable
 
         // When users click to cell we need to find the day, hour and minutes (first 30 minutes or second 30 minutes) that it represents on the timeline.
 
+        if (PositionerUIElement == null)
+        {
+            PositionerUIElement = this.FindParents().LastOrDefault(a => a is Grid);
+        }
+
         PointerPoint positionerRootPoint = e.GetCurrentPoint(PositionerUIElement);
         PointerPoint canvasPointerPoint = e.GetCurrentPoint(Canvas);