changed Row to struct

Author: vgromfeld

Microsoft.Toolkit.Uwp.UI.Controls/WrapPanel/WrapPanel.Data.cs

@@ -66,15 +66,15 @@ public Rect ToRect(Orientation orientation)
             }
         }
 
-        private class Row
+        private struct Row
         {
             private readonly List<UvRect> _childrenRects;
             private UvMeasure _rowSize;
 
-            public Row()
+            public Row(List<UvRect> childrenRects, UvMeasure size)
             {
-                _childrenRects = new List<UvRect>();
-                _rowSize = UvMeasure.Zero;
+                _childrenRects = childrenRects;
+                _rowSize = size;
             }
 
             public IReadOnlyList<UvRect> ChildrenRects => _childrenRects;
@@ -87,7 +87,7 @@ public Row()
             public void Add(UvMeasure position, UvMeasure size)
             {
                 _childrenRects.Add(new UvRect { Position = position, Size = size });
-                _rowSize.U = Math.Max(_rowSize.U, position.U + size.U);
+                _rowSize.U = position.U + size.U;
                 _rowSize.V = Math.Max(_rowSize.V, size.V);
             }
         }

Microsoft.Toolkit.Uwp.UI.Controls/WrapPanel/WrapPanel.cs

@@ -209,7 +209,7 @@ protected override Size ArrangeOverride(Size finalSize)
                 var paddingEnd = new UvMeasure(Orientation, Padding.Right, Padding.Bottom);
                 var position = new UvMeasure(Orientation, Padding.Left, Padding.Top);
 
-                var currentRow = new Row();
+                var currentRow = new Row(new List<UvRect>(), default);
                 void Arrange(UIElement child, bool isLast = false)
                 {
                     var desiredMeasure = new UvMeasure(Orientation, child.DesiredSize);
@@ -225,7 +225,7 @@ void Arrange(UIElement child, bool isLast = false)
                         position.V += currentRow.Size.V + spacingMeasure.V;
 
                         rows.Add(currentRow);
-                        currentRow = new Row();
+                        currentRow = new Row(new List<UvRect>(), default);
                     }
 
                     // Stretch the last item to fill the available space