Add some WinUI work

Toolkit.Windows/WndProc.cs

@@ -1,7 +1,7 @@
 using CommunityToolkit.Mvvm.Messaging;
+using Toolkit.Foundation;
 using Windows.Win32;
 using Windows.Win32.Foundation;
-using Windows.Win32.Graphics.Gdi;
 using Windows.Win32.UI.WindowsAndMessaging;
 
 namespace Toolkit.Windows;
@@ -10,56 +10,61 @@ public class WndProc(IMessenger messenger) :
     IWndProc
 {
     private WNDPROC? handler;
+    private bool isDisposed;
+
+    ~WndProc()
+    {
+        Dispose(false);
+    }
 
     public IntPtr Handle { get; private set; }
 
     public void Dispose()
     {
+        Dispose(true);
         GC.SuppressFinalize(this);
+    }
+
+    public void Initialize() => InitializeWndProc();
+
+    protected virtual void Dispose(bool disposing)
+    {
+        if (isDisposed)
+        {
+            return;
+        }
+
+        isDisposed = true;
+
         PInvoke.DestroyWindow((HWND)Handle);
     }
+    private LRESULT HandleWndProc(HWND hWnd, uint msg,
+        WPARAM wParam, LPARAM lParam)
+    {
+        messenger.Send(new WndProcEventArgs(msg,
+            (uint)wParam.Value,
+            (uint)lParam.Value));
+
+        return PInvoke.DefWindowProc(hWnd, msg, wParam, lParam);
+    }
 
     private unsafe void InitializeWndProc()
     {
-        string windowName = Guid.NewGuid().ToString();
-        handler = Wndproc;
+        string windowId = $"WndProc_Handler_{Guid.NewGuid()}";
+        handler = HandleWndProc;
 
-        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 = "")
+        fixed (char* className = windowId)
         {
-            wndProcWindow.lpszMenuName = new PCWSTR(menuName);
+            WNDCLASSW wndCLass = new()
+            {
+                lpfnWndProc = handler,
+                lpszClassName = className,
+            };
+
+            _ = PInvoke.RegisterClass(wndCLass);
         }
 
-        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)
-    {
-        messenger.Send(new WndProcEventArgs(param1, (uint)param2.Value, (uint)param3.Value));
-        return PInvoke.DefWindowProc(param0, param1, param2, param3);
-    }
-
-    public void Initialize()
-    {
-        InitializeWndProc();
+        Handle = PInvoke.CreateWindowEx(0, windowId, windowId, 0, 0, 0, 0, 0,
+            new HWND(IntPtr.Zero), null, null, null);
     }
 }