ComPDFKit.Tool(win) - 补充获取当前是否多选状态的接口

Demo/Examples/ComPDFKit.Tool/CPDFViewerTool.xaml.cs

@@ -124,6 +124,11 @@ namespace ComPDFKit.Tool
         private bool isMultiSelected;
         private bool isDocumentModified = false;
 
+        public bool GetIsMultiSelected()
+        { 
+            return isMultiSelected;
+        }
+
         /// <summary>
         ///  Does it support multiple selection
         /// </summary>