优化更新代码，添加界面功能并整合

WPFluent/Appearance/ObservedWindow.cs

@@ -0,0 +1,79 @@
+
+
+
+using WPFluent.Controls;
+
+namespace WPFluent.Appearance;
+
+/// <summary>
+/// Represents a window that is being observed for changes in appearance.
+/// </summary>
+internal class ObservedWindow
+{
+    private readonly HwndSource _source;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ObservedWindow"/> class.
+    /// </summary>
+    /// <param name="handle">The handle of the window.</param>
+    /// <param name="backdrop">The backdrop type of the window.</param>
+    /// <param name="updateAccents">Indicates whether to update accents.</param>
+    public ObservedWindow(IntPtr handle, WindowBackdropType backdrop, bool updateAccents)
+    {
+        Handle = handle;
+        Backdrop = backdrop;
+        UpdateAccents = updateAccents;
+        HasHook = false;
+
+        HwndSource? windowSource = HwndSource.FromHwnd(handle);
+        _source =
+            windowSource ?? throw new InvalidOperationException("Unable to determine the window source.");
+    }
+
+    /// <summary>
+    /// Adds a hook to the window.
+    /// </summary>
+    /// <param name="hook">The hook to add.</param>
+    public void AddHook(HwndSourceHook hook)
+    {
+        _source.AddHook(hook);
+
+        HasHook = true;
+    }
+
+    /// <summary>
+    /// Removes a hook from the window.
+    /// </summary>
+    /// <param name="hook">The hook to remove.</param>
+    public void RemoveHook(HwndSourceHook hook)
+    {
+        _source.RemoveHook(hook);
+
+        HasHook = false;
+    }
+
+    /// <summary>
+    /// Gets the backdrop type of the window.
+    /// </summary>
+    public WindowBackdropType Backdrop { get; }
+
+    /// <summary>
+    /// Gets the handle of the window.
+    /// </summary>
+    public IntPtr Handle { get; }
+
+    /// <summary>
+    /// Gets a value indicating whether the window has a hook.
+    /// </summary>
+    public bool HasHook { get; private set; }
+
+    /// <summary>
+    /// Gets the root visual of the window.
+    /// </summary>
+    public Window? RootVisual => (Window?)_source.RootVisual;
+
+    /// <summary>
+    /// Gets a value indicating whether to update accents.
+    /// </summary>
+    public bool UpdateAccents { get; }
+}