ComPDFKit.Tool(win)-事件补加空处理

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

@@ -1117,7 +1117,7 @@ namespace ComPDFKit.Tool
                         (currentEditAreaObject.cPDFEditArea as CPDFEditTextArea)?.GetPrevCharPlace();
                         (currentEditAreaObject.cPDFEditArea as CPDFEditTextArea)?.ClearSelectChars();
                         DrawCaretVisualArea(currentEditAreaObject.cPDFEditArea as CPDFEditTextArea);
-                        CaretVisualAreaChanged.Invoke(null, null);
+                        CaretVisualAreaChanged?.Invoke(null, null);
                         ke.Handled = true;
                     }
                     break;
@@ -1127,7 +1127,7 @@ namespace ComPDFKit.Tool
                         (currentEditAreaObject.cPDFEditArea as CPDFEditTextArea)?.GetNextCharPlace();
                         (currentEditAreaObject.cPDFEditArea as CPDFEditTextArea)?.ClearSelectChars();
                         DrawCaretVisualArea(currentEditAreaObject.cPDFEditArea as CPDFEditTextArea);
-                        CaretVisualAreaChanged.Invoke(null, null);
+                        CaretVisualAreaChanged?.Invoke(null, null);
                         ke.Handled = true;
                     }
                     break;
@@ -1137,7 +1137,7 @@ namespace ComPDFKit.Tool
                         (currentEditAreaObject.cPDFEditArea as CPDFEditTextArea)?.GetUpCharPlace();
                         (currentEditAreaObject.cPDFEditArea as CPDFEditTextArea)?.ClearSelectChars();
                         DrawCaretVisualArea(currentEditAreaObject.cPDFEditArea as CPDFEditTextArea);
-                        CaretVisualAreaChanged.Invoke(null, null);
+                        CaretVisualAreaChanged?.Invoke(null, null);
                         ke.Handled = true;
                     }
                     break;
@@ -1147,7 +1147,7 @@ namespace ComPDFKit.Tool
                         (currentEditAreaObject.cPDFEditArea as CPDFEditTextArea)?.GetDownCharPlace();
                         (currentEditAreaObject.cPDFEditArea as CPDFEditTextArea)?.ClearSelectChars();
                         DrawCaretVisualArea(currentEditAreaObject.cPDFEditArea as CPDFEditTextArea);
-                        CaretVisualAreaChanged.Invoke(null, null);
+                        CaretVisualAreaChanged?.Invoke(null, null);
                         ke.Handled = true;
                     }
                     break;