1 files changed, 16 insertions, 0 deletions
diff --git a/fpdfsdk/cpdfsdk_baannothandler.cpp b/fpdfsdk/cpdfsdk_baannothandler.cpp
index 24643eb70e..ab46a9683c 100644
--- a/fpdfsdk/cpdfsdk_baannothandler.cpp
+++ b/fpdfsdk/cpdfsdk_baannothandler.cpp
@@ -204,6 +204,22 @@ WideString CPDFSDK_BAAnnotHandler::GetSelectedText(CPDFSDK_Annot* pAnnot) {
 void CPDFSDK_BAAnnotHandler::ReplaceSelection(CPDFSDK_Annot* pAnnot,
                                               const WideString& text) {}
 
+bool CPDFSDK_BAAnnotHandler::CanUndo(CPDFSDK_Annot* pAnnot) {
+  return false;
+}
+
+bool CPDFSDK_BAAnnotHandler::CanRedo(CPDFSDK_Annot* pAnnot) {
+  return false;
+}
+
+bool CPDFSDK_BAAnnotHandler::Undo(CPDFSDK_Annot* pAnnot) {
+  return false;
+}
+
+bool CPDFSDK_BAAnnotHandler::Redo(CPDFSDK_Annot* pAnnot) {
+  return false;
+}
+
 bool CPDFSDK_BAAnnotHandler::HitTest(CPDFSDK_PageView* pPageView,
                                      CPDFSDK_Annot* pAnnot,
                                      const CFX_PointF& point) {