XAML-Map-Control/MapControl/Avalonia/MapItemsControl.Avalonia.cs

using Avalonia.Controls;
using Avalonia.Controls.Presenters;
using Avalonia.Controls.Templates;
using Avalonia.Input;
using Avalonia.Media;

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(geometry.FillContains);
        }

        public new MapItem ContainerFromItem(object item)
        {
            return (MapItem)base.ContainerFromItem(item);
        }

        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);
            PrepareContainer((MapItem)container, item);
        }

        protected override void ClearContainerForItemOverride(Control container)
        {
            base.ClearContainerForItemOverride(container);
            ClearContainer((MapItem)container);
        }

        internal void UpdateSelection(MapItem mapItem, PointerEventArgs e)
        {
            if (SelectionMode != SelectionMode.Single &&
                e.KeyModifiers.HasFlag(KeyModifiers.Shift))
            {
                SelectItemsInRange(mapItem);
            }
            else
            {
                UpdateSelection(mapItem, true, false, e.KeyModifiers.HasFlag(KeyModifiers.Control));
            }
        }
    }
}