Moved WndProcMonitor to this project

Toolkit.Windows/IWndProcMonitor.cs

@@ -0,0 +1,7 @@
+using Toolkit.Foundation;
+
+namespace Toolkit.Windows;
+
+public interface IWndProcMonitor :
+    IInitialization, 
+    IDisposable;

Toolkit.Windows/PointerMonitor.cs

@@ -1,12 +1,71 @@
-using System.Drawing;
+using System.Diagnostics.CodeAnalysis;
-using Windows.Win32;
+using System.Drawing;
-using Windows.Win32.UI.WindowsAndMessaging;
-using Windows.Win32.Foundation;
-using System.Diagnostics.CodeAnalysis;
 using Toolkit.Foundation;
+using Windows.Win32;
+using Windows.Win32.Foundation;
+using Windows.Win32.Graphics.Gdi;
+using Windows.Win32.UI.WindowsAndMessaging;
 
 namespace Toolkit.Windows;
 
+public class WndProcMonitor(IPublisher publisher) : 
+    IWndProcMonitor
+{
+    private WNDPROC? handler;
+    private readonly IPublisher publisher = publisher;
+
+    public IntPtr Handle { get; private set; }
+
+    public void Dispose()
+    {
+        PInvoke.DestroyWindow((HWND)Handle);
+    }
+
+    private unsafe void InitializeWndProc()
+    {
+        var windowName = Guid.NewGuid().ToString();
+        handler = Wndproc;
+
+        WNDCLASSW wndProcWindow;
+
+        wndProcWindow.style = 0;
+        wndProcWindow.lpfnWndProc = handler;
+        wndProcWindow.cbClsExtra = 0;
+        wndProcWindow.cbWndExtra = 0;
+        wndProcWindow.hInstance = new HINSTANCE();
+        wndProcWindow.hIcon = new HICON();
+        wndProcWindow.hCursor = new HCURSOR();
+        wndProcWindow.hbrBackground = new HBRUSH();
+
+        fixed (char* menuName = "")
+        {
+            wndProcWindow.lpszMenuName = new PCWSTR(menuName);
+        }
+
+        fixed (char* className = windowName)
+        {
+            wndProcWindow.lpszClassName = new PCWSTR(className);
+        }
+
+        PInvoke.RegisterClass(wndProcWindow);
+        Handle = PInvoke.CreateWindowEx(0, wndProcWindow.lpszClassName, 
+            new PCWSTR(), 0, 0, 0, 0, 0, new HWND(),
+            new HMENU(),
+            new HINSTANCE());
+    }
+
+    private LRESULT Wndproc(HWND param0, uint param1, WPARAM param2, LPARAM param3)
+    {
+        publisher.Publish(new WndProcEventArgs(param1, (uint)param2.Value, (uint)param3.Value));
+        return PInvoke.DefWindowProc(param0, param1, param2, param3);
+    }
+
+    public void Initialize()
+    {
+        InitializeWndProc();
+    }
+}
+
 
 public class PointerMonitor(IPublisher publisher) : 
     IPointerMonitor

Toolkit.Windows/WndProcEventArgs.cs

@@ -0,0 +1,3 @@
+namespace Toolkit.Windows;
+
+public record WndProcEventArgs(uint Message, uint WParam, uint LParam);