Initial integration.

Wino.Mail.WinUI/Models/Args/TimelineCellSelectedArgs.cs

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+using System;
+using Windows.Foundation;
+
+namespace Wino.Calendar.Args;
+
+/// <summary>
+/// When a new timeline cell is selected.
+/// </summary>
+public class TimelineCellSelectedArgs : EventArgs
+{
+    public TimelineCellSelectedArgs(DateTime clickedDate, Point canvasPoint, Point positionerPoint, Size cellSize)
+    {
+        ClickedDate = clickedDate;
+        CanvasPoint = canvasPoint;
+        PositionerPoint = positionerPoint;
+        CellSize = cellSize;
+    }
+
+    /// <summary>
+    /// Clicked date and time information for the cell.
+    /// </summary>
+    public DateTime ClickedDate { get; set; }
+
+    /// <summary>
+    /// Position relative to the cell drawing part of the canvas.
+    /// Used to detect clicked cell from the position.
+    /// </summary>
+    public Point CanvasPoint { get; }
+
+    /// <summary>
+    /// Position relative to the main root positioner element of the drawing canvas.
+    /// Used to show the create event dialog teaching tip in correct position.
+    /// </summary>
+    public Point PositionerPoint { get; }
+
+    /// <summary>
+    /// Size of the cell.
+    /// </summary>
+    public Size CellSize { get; }
+}

Wino.Mail.WinUI/Models/Args/TimelineCellUnselectedArgs.cs

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+using System;
+
+namespace Wino.Calendar.Args;
+
+/// <summary>
+/// When selected timeline cell is unselected.
+/// </summary>
+public class TimelineCellUnselectedArgs : EventArgs { }

Wino.Mail.WinUI/Models/CalendarItemMeasurement.cs

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+namespace Wino.Calendar.Models;
+
+public struct CalendarItemMeasurement
+{
+    // Where to start?
+    public double Left { get; set; }
+
+    // Extend until where?
+    public double Right { get; set; }
+
+    public CalendarItemMeasurement(double left, double right)
+    {
+        Left = left;
+        Right = right;
+    }
+}