优化更新代码，添加界面功能并整合

WPFluent/Controls/Scroll/ScrollDirection.cs

@@ -0,0 +1,27 @@
+
+
+
+/* Based on VirtualizingWrapPanel created by S. Bäumlisberger licensed under MIT license.
+   https://github.com/sbaeumlisberger/VirtualizingWrapPanel
+
+   Copyright (C) S. Bäumlisberger
+   All Rights Reserved. */
+
+namespace WPFluent.Controls;
+
+/// <summary>
+/// Direction of <see cref="System.Windows.Controls.ScrollViewer"/>. <para>Based on <see
+/// href="https://github.com/sbaeumlisberger/VirtualizingWrapPanel"/>.</para>
+/// </summary>
+public enum ScrollDirection
+{
+    /// <summary>
+    /// Vertical scroll direction.
+    /// </summary>
+    Vertical,
+
+    /// <summary>
+    /// Horizontal scroll direction.
+    /// </summary>
+    Horizontal,
+}