New menu item implementation based directly on MenuItem/ToggleMenuFlyoutItem

MapUiTools/Shared/MenuButton.cs

@@ -0,0 +1,50 @@
+using System.Threading.Tasks;
+#if WPF
+using System.Windows;
+using System.Windows.Controls;
+#elif UWP
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+#elif WINUI
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+#else
+using Avalonia.Controls;
+using DependencyProperty = Avalonia.AvaloniaProperty;
+#endif
+
+namespace MapControl.UiTools
+{
+    public partial class MenuButton : Button
+    {
+        public static readonly DependencyProperty MapProperty =
+            DependencyPropertyHelper.Register<MenuButton, MapBase>(nameof(Map), null,
+                async (button, oldValue, newValue) => await button.Initialize());
+
+        public MapBase Map
+        {
+            get => (MapBase)GetValue(MapProperty);
+            set => SetValue(MapProperty, value);
+        }
+
+        private async Task Initialize()
+        {
+            if (Map != null)
+            {
+                DataContext = Map;
+
+                if (Items.Count > 0)
+                {
+                    if (Items[0] is MapLayerMenuItem mapLayerItem)
+                    {
+                        await mapLayerItem.Execute(Map);
+                    }
+                    else if (Items[0] is MapProjectionMenuItem mapProjectionItem)
+                    {
+                        mapProjectionItem.Execute(Map);
+                    }
+                }
+            }
+        }
+    }
+}