Avalonia MapItemsControl

MapControl/Avalonia/MapItemsControl.Avalonia.cs

@@ -0,0 +1,64 @@
+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// Copyright © 2024 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using Avalonia.Controls.Presenters;
+using Avalonia.Controls.Templates;
+
+namespace MapControl
+{
+    public partial class MapItemsControl
+    {
+        static MapItemsControl()
+        {
+            TemplateProperty.OverrideDefaultValue<MapItemsControl>(
+                new FuncControlTemplate<MapItemsControl>(
+                    (itemsControl, namescope) => new ItemsPresenter { ItemsPanel = itemsControl.ItemsPanel }));
+
+            ItemsPanelProperty.OverrideDefaultValue<MapItemsControl>(
+                new FuncTemplate<Panel>(() => new MapPanel()));
+        }
+
+        public void SelectItemsInGeometry(Geometry geometry)
+        {
+            SelectItemsByPosition(p => geometry.FillContains(p));
+        }
+
+        protected override bool NeedsContainerOverride(object item, int index, out object recycleKey)
+        {
+            recycleKey = null;
+
+            return item is not MapItem;
+        }
+
+        protected override Control CreateContainerForItemOverride(object item, int index, object recycleKey)
+        {
+            return new MapItem();
+        }
+
+        protected override void PrepareContainerForItemOverride(Control container, object item, int index)
+        {
+            base.PrepareContainerForItemOverride(container, item, index);
+
+            if (LocationMemberPath != null && container is MapItem mapItem)
+            {
+                mapItem.SetBinding(MapItem.LocationProperty,
+                    new Binding
+                    {
+                        Path = new PropertyPath(LocationMemberPath),
+                        Source = item
+                    });
+            }
+        }
+
+        protected override void ClearContainerForItemOverride(Control container)
+        {
+            base.ClearContainerForItemOverride(container);
+
+            if (LocationMemberPath != null && container is MapItem mapItem)
+            {
+                mapItem.ClearValue(MapItem.LocationProperty);
+            }
+        }
+    }
+}