Add public APIs for undo / redo in forms.

Add FORM_CanUndo(), FORM_CanRedo(), FORM_Undo(), and FORM_Redo().

BUG=chromium:764260

Change-Id: I1d9ea67152d9b35d9b8e1d7ef7d019706fdfa30a
Reviewed-on: https://pdfium-review.googlesource.com/30872
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

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) {