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, 28 insertions, 0 deletions

diff --git a/fpdfsdk/cpdfsdk_xfawidgethandler.cpp b/fpdfsdk/cpdfsdk_xfawidgethandler.cpp
index 261c27c384..16692b3d25 100644
--- a/fpdfsdk/cpdfsdk_xfawidgethandler.cpp
+++ b/fpdfsdk/cpdfsdk_xfawidgethandler.cpp
@@ -125,6 +125,34 @@ void CPDFSDK_XFAWidgetHandler::ReplaceSelection(CPDFSDK_Annot* pAnnot,
   return pWidgetHandler->PasteText(pAnnot->GetXFAWidget(), text);
 }
 
+bool CPDFSDK_XFAWidgetHandler::CanUndo(CPDFSDK_Annot* pAnnot) {
+  if (!pAnnot)
+    return false;
+  CXFA_FFWidgetHandler* pWidgetHandler = GetXFAWidgetHandler(pAnnot);
+  return pWidgetHandler->CanUndo(pAnnot->GetXFAWidget());
+}
+
+bool CPDFSDK_XFAWidgetHandler::CanRedo(CPDFSDK_Annot* pAnnot) {
+  if (!pAnnot)
+    return false;
+  CXFA_FFWidgetHandler* pWidgetHandler = GetXFAWidgetHandler(pAnnot);
+  return pWidgetHandler->CanRedo(pAnnot->GetXFAWidget());
+}
+
+bool CPDFSDK_XFAWidgetHandler::Undo(CPDFSDK_Annot* pAnnot) {
+  if (!pAnnot)
+    return false;
+  CXFA_FFWidgetHandler* pWidgetHandler = GetXFAWidgetHandler(pAnnot);
+  return pWidgetHandler->Undo(pAnnot->GetXFAWidget());
+}
+
+bool CPDFSDK_XFAWidgetHandler::Redo(CPDFSDK_Annot* pAnnot) {
+  if (!pAnnot)
+    return false;
+  CXFA_FFWidgetHandler* pWidgetHandler = GetXFAWidgetHandler(pAnnot);
+  return pWidgetHandler->Redo(pAnnot->GetXFAWidget());
+}
+
 bool CPDFSDK_XFAWidgetHandler::HitTest(CPDFSDK_PageView* pPageView,
                                        CPDFSDK_Annot* pAnnot,
                                        const CFX_PointF& point) {