Initial feature for drag / drop calendar events.

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

@@ -0,0 +1,28 @@
+using System;
+using Wino.Calendar.ViewModels.Data;
+
+namespace Wino.Calendar.Controls;
+
+public enum CalendarDropTargetKind
+{
+    TimedSlot,
+    TimedAllDay,
+    MonthCell
+}
+
+public sealed class CalendarItemDroppedEventArgs : EventArgs
+{
+    public CalendarItemDroppedEventArgs(
+        CalendarItemViewModel calendarItemViewModel,
+        DateTime targetStart,
+        CalendarDropTargetKind targetKind)
+    {
+        CalendarItemViewModel = calendarItemViewModel;
+        TargetStart = targetStart;
+        TargetKind = targetKind;
+    }
+
+    public CalendarItemViewModel CalendarItemViewModel { get; }
+    public DateTime TargetStart { get; }
+    public CalendarDropTargetKind TargetKind { get; }
+}