更新

WPFDark/Controls/Internals/BiaHamburgerMenuHost.xaml.cs

@@ -0,0 +1,67 @@
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+
+using WPFDark.Internals;
+
+namespace WPFDark.Controls.Internals
+{
+    internal class BiaHamburgerMenuHost : Control
+    {
+        #region HamburgerMenuItem
+        
+        public BiaHamburgerMenu? MenuItem
+        {
+            get => _menuItem;
+            set
+            {
+                if (value != _menuItem)
+                    SetValue(MenuItemProperty, value);
+            }
+        }
+        
+        private BiaHamburgerMenu? _menuItem;
+        
+        public static readonly DependencyProperty MenuItemProperty =
+            DependencyProperty.Register(
+                nameof(MenuItem),
+                typeof(BiaHamburgerMenu),
+                typeof(BiaHamburgerMenuHost),
+                new PropertyMetadata(
+                    default,
+                    (s, e) =>
+                    {
+                        var self = (BiaHamburgerMenuHost) s;
+                        self._menuItem = (BiaHamburgerMenu)e.NewValue;
+
+                        self.UpdateMenuItem();
+                    }));
+
+        #endregion
+
+        static BiaHamburgerMenuHost()
+        {
+            DefaultStyleKeyProperty.OverrideMetadata(typeof(BiaHamburgerMenuHost),
+                new FrameworkPropertyMetadata(typeof(BiaHamburgerMenuHost)));
+        }
+        
+        public override void OnApplyTemplate()
+        {
+            UpdateMenuItem();
+        }
+        
+        private void UpdateMenuItem()
+        {
+            var menu = this.Descendants().OfType<Menu?>().FirstOrDefault();
+            if (menu is null)
+                return;
+
+            menu.Items.Clear();
+            
+            if (MenuItem is null)
+                return;
+
+            menu.Items.Add(MenuItem);
+        }
+    }
+}