Fixed clipping of WinUI/UWP MapPath

MapControl/WinUI/CanvasPanel.cs

@@ -0,0 +1,48 @@
+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// Copyright © 2023 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using System.Linq;
+using Windows.Foundation;
+#if WINUI
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+#elif UWP
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+#endif
+
+namespace MapControl
+{
+    /// <summary>
+    /// Replacement for WinUI and UWP Canvas, which clips MapPath child elements.
+    /// </summary>
+    public class CanvasPanel : Panel
+    {
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            availableSize = new Size(double.PositiveInfinity, double.PositiveInfinity);
+
+            foreach (var element in Children.OfType<UIElement>())
+            {
+                element.Measure(availableSize);
+            }
+
+            return new Size();
+        }
+
+        protected override Size ArrangeOverride(Size finalSize)
+        {
+            foreach (var element in Children.OfType<UIElement>())
+            {
+                var x = Canvas.GetLeft(element);
+                var y = Canvas.GetTop(element);
+                var p = new Point(double.IsNaN(x) ? 0d : x, double.IsNaN(y) ? 0d : y);
+
+                element.Arrange(new Rect(p, MapPanel.GetDesiredSize(element)));
+            }
+
+            return finalSize;
+        }
+    }
+}