⚰️ 虚拟化环绕panel

Util/WrpaPanel/ItemRange.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace GeekDesk.Util.WrpaPanel
+{
+    public struct ItemRange
+    {
+        public int StartIndex { get; }
+        public int EndIndex { get; }
+
+        public ItemRange(int startIndex, int endIndex) : this()
+        {
+            StartIndex = startIndex;
+            EndIndex = endIndex;
+        }
+
+        public bool Contains(int itemIndex)
+        {
+            return itemIndex >= StartIndex && itemIndex <= EndIndex;
+        }
+    }
+}