Add project files.

Nodify/Editor/Events/ItemsMovedEventArgs.cs

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+using System;
+using System.Collections.Generic;
+using System.Windows;
+
+namespace Nodify.Events
+{
+    /// <summary>
+    /// Represents a method signature used to handle the <see cref="NodifyEditor.ItemsMovedEvent"/> routed event.
+    /// </summary>
+    /// <param name="sender">The source of the event.</param>
+    /// <param name="e">The event data containing information about the moved items and their offset.</param>
+    public delegate void ItemsMovedEventHandler(object sender, ItemsMovedEventArgs e);
+
+    /// <summary>
+    /// Provides data for the <see cref="NodifyEditor.ItemsMovedEvent"/> routed event.
+    /// </summary>
+    public class ItemsMovedEventArgs : RoutedEventArgs
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ItemsMovedEventArgs"/> class with the specified moved items and offset.
+        /// </summary>
+        /// <param name="items">The collection of items that were moved.</param>
+        /// <param name="offset">The vector representing the distance the items were moved.</param>
+        public ItemsMovedEventArgs(IReadOnlyCollection<object> items, Vector offset)
+        {
+            Items = items;
+            Offset = offset;
+        }
+
+        /// <summary>
+        /// Gets or sets the vector representing the distance the items were moved.
+        /// </summary>
+        public Vector Offset { get; set; }
+
+        /// <summary>
+        /// Gets a collection of <see cref="FrameworkElement.DataContext"/>s of the <see cref="ItemContainer"/>s associated with this event.
+        /// </summary>
+        public IReadOnlyCollection<object> Items { get; }
+
+        protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget)
+            => ((ItemsMovedEventHandler)genericHandler)(genericTarget, this);
+    }
+}