Implement custom wrap panel for reading page.

Wino.Core.UWP/Controls/CustomWrapPanel.cs

@@ -0,0 +1,70 @@
+using System;
+
+namespace Wino.Core.UWP.Controls
+{
+    using Windows.Foundation;
+    using Windows.UI.Xaml;
+    using Windows.UI.Xaml.Controls;
+
+    namespace CustomControls
+    {
+        public class CustomWrapPanel : Panel
+        {
+            protected override Size MeasureOverride(Size availableSize)
+            {
+                double currentRowWidth = 0;
+                double currentRowHeight = 0;
+                double totalHeight = 0;
+
+                foreach (UIElement child in Children)
+                {
+                    child.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
+
+                    var childDesiredSize = child.DesiredSize;
+
+                    if (currentRowWidth + childDesiredSize.Width > availableSize.Width)
+                    {
+                        // Wrap to the next row
+                        totalHeight += currentRowHeight;
+                        currentRowWidth = 0;
+                        currentRowHeight = 0;
+                    }
+
+                    currentRowWidth += childDesiredSize.Width;
+                    currentRowHeight = Math.Max(currentRowHeight, childDesiredSize.Height);
+                }
+
+                totalHeight += currentRowHeight;
+
+                return new Size(availableSize.Width, totalHeight);
+            }
+
+            protected override Size ArrangeOverride(Size finalSize)
+            {
+                double currentRowWidth = 0;
+                double currentRowHeight = 0;
+                double currentY = 0;
+
+                foreach (UIElement child in Children)
+                {
+                    var childDesiredSize = child.DesiredSize;
+
+                    if (currentRowWidth + childDesiredSize.Width > finalSize.Width)
+                    {
+                        currentY += currentRowHeight;
+                        currentRowWidth = 0;
+                        currentRowHeight = 0;
+                    }
+
+                    child.Arrange(new Rect(new Point(currentRowWidth, currentY), childDesiredSize));
+
+                    currentRowWidth += childDesiredSize.Width;
+                    currentRowHeight = Math.Max(currentRowHeight, childDesiredSize.Height);
+                }
+
+                return finalSize;
+            }
+        }
+    }
+
+}