更新

AntdWpf/Utils/RectUtil.cs

@@ -0,0 +1,34 @@
+namespace AntdWpf.Utils
+{
+    using System;
+    using System.Windows;
+
+    internal static class RectUtil
+    {
+        /// <summary>
+        /// Deflates rectangle by given thickness
+        /// </summary>
+        /// <param name="rect">Rectangle</param>
+        /// <param name="thick">Thickness</param>
+        /// <returns>Deflated Rectangle</returns>
+        public static Rect Deflate(Rect rect, Thickness thick)
+        {
+            return new Rect(rect.Left + thick.Left, rect.Top + thick.Top,
+                            Math.Max(0.0, rect.Width - thick.Left - thick.Right),
+                            Math.Max(0.0, rect.Height - thick.Top - thick.Bottom));
+        }
+
+        /// <summary>
+        /// Inflates rectangle by given thickness
+        /// </summary>
+        /// <param name="rect">Rectangle</param>
+        /// <param name="thick">Thickness</param>
+        /// <returns>Inflated Rectangle</returns>
+        public static Rect Inflate(Rect rect, Thickness thick)
+        {
+            return new Rect(rect.Left - thick.Left, rect.Top - thick.Top,
+                            Math.Max(0.0, rect.Width + thick.Left + thick.Right),
+                            Math.Max(0.0, rect.Height + thick.Top + thick.Bottom));
+        }
+    }
+}