XAML-Map-Control/MapControl/WPF/MapItem.WPF.cs

using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace MapControl;

public partial class MapItem
{
    static MapItem()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(MapItem), new FrameworkPropertyMetadata(typeof(MapItem)));
    }

    protected override void OnTouchDown(TouchEventArgs e)
    {
        e.Handled = true;
    }

    protected override void OnTouchUp(TouchEventArgs e)
    {
        e.Handled = true;
    }

    protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
    {
        if (Keyboard.Modifiers.HasFlag(ModifierKeys.Shift) &&
            ItemsControl.ItemsControlFromItemContainer(this) is MapItemsControl mapItemsControl &&
            mapItemsControl.SelectionMode == SelectionMode.Extended)
        {
            mapItemsControl.SelectItemsInRange(this);
            e.Handled = true;
        }
        else
        {
            base.OnMouseLeftButtonDown(e);
        }
    }
}