New menu item implementation based directly on MenuItem/ToggleMenuFlyoutItem

MapUiTools/Shared/MapProjectionMenuItem.cs

@@ -0,0 +1,64 @@
+using System;
+using System.Diagnostics;
+using System.Linq;
+#if WPF
+using System.Windows.Markup;
+#elif UWP
+using Windows.UI.Xaml.Markup;
+#elif WINUI
+using Microsoft.UI.Xaml.Markup;
+#else
+using Avalonia.Metadata;
+#endif
+
+namespace MapControl.UiTools
+{
+#if WPF
+    [ContentProperty(nameof(MapProjection))]
+#elif UWP || WINUI
+    [ContentProperty(Name = nameof(MapProjection))]
+#endif
+    public class MapProjectionMenuItem : MapMenuItem
+    {
+#if AVALONIA
+        [Content]
+#endif
+        public string MapProjection { get; set; }
+
+        public MapProjectionMenuItem()
+        {
+            Click += (s, e) =>
+            {
+                if (DataContext is MapBase map)
+                {
+                    Execute(map);
+
+                    foreach (var item in ParentMenuItems.OfType<MapProjectionMenuItem>())
+                    {
+                        item.IsChecked = map.MapProjection.CrsId == item.MapProjection;
+                    }
+                }
+            };
+        }
+
+        public void Execute(MapBase map)
+        {
+            bool success = true;
+
+            if (map.MapProjection.CrsId != MapProjection)
+            {
+                try
+                {
+                    map.MapProjection = MapProjectionFactory.Instance.GetProjection(MapProjection);
+                }
+                catch (Exception ex)
+                {
+                    Debug.WriteLine($"{nameof(MapProjectionFactory)}: {ex.Message}");
+                    success = false;
+                }
+            }
+
+            IsChecked = success;
+        }
+    }
+}