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InkCanvasForClassX/Libraries/InkCanvas.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace InkCanvasForClassX.Libraries
+{
+    public partial class InkCanvas : UserControl
+    {
+
+        public static readonly DependencyProperty InkStrokesProperty =
+            DependencyProperty.Register(
+                name: "InkStrokes",
+                propertyType: typeof(StrokeCollection),
+                ownerType: typeof(InkCanvas),
+                typeMetadata: new FrameworkPropertyMetadata(
+                    defaultValue: new StrokeCollection(),
+                    propertyChangedCallback: new PropertyChangedCallback(OnInkStrokesChanged))
+            );
+
+        public StrokeCollection InkStrokes {
+            get => (StrokeCollection)GetValue(InkStrokesProperty);
+            set {
+                Trace.WriteLine("Set InkStrokes");
+                SetValue(InkStrokesProperty, value);
+            }
+        }
+
+        private static void OnInkStrokesChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            Trace.WriteLine("Update");
+            var control = (InkCanvas)d;
+            if (e.OldValue is StrokeCollection oldStrokes) {
+                oldStrokes.StrokesChanged -= control.OnStrokesChanged;
+            }
+
+            if (e.NewValue is StrokeCollection newStrokes) {
+                newStrokes.StrokesChanged += control.OnStrokesChanged;
+                control.inkProjector.Strokes = newStrokes;
+            }
+        }
+        private void OnStrokesChanged(object sender, StrokeCollectionChangedEventArgs e)
+        {
+            Trace.WriteLine("Strokes Collection Changed");
+            // Ensure that the InkStrokes dependency property updates
+            SetValue(InkStrokesProperty, sender as StrokeCollection);
+            inkProjector.Strokes = sender as StrokeCollection;
+        }
+
+        public InkCanvas()
+        {
+            InitializeComponent();
+            InkStrokes.StrokesChanged += OnStrokesChanged;
+        }
+    }
+}