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>

2 files changed, 21 insertions, 0 deletions

diff --git a/xfa/fxfa/cxfa_ffwidgethandler.cpp b/xfa/fxfa/cxfa_ffwidgethandler.cpp
index c3efd60b1d..a820db8083 100644
--- a/xfa/fxfa/cxfa_ffwidgethandler.cpp
+++ b/xfa/fxfa/cxfa_ffwidgethandler.cpp
@@ -166,6 +166,22 @@ void CXFA_FFWidgetHandler::PasteText(CXFA_FFWidget* widget,
   widget->Paste(text);
 }
 
+bool CXFA_FFWidgetHandler::CanUndo(CXFA_FFWidget* widget) {
+  return widget->CanUndo();
+}
+
+bool CXFA_FFWidgetHandler::CanRedo(CXFA_FFWidget* widget) {
+  return widget->CanRedo();
+}
+
+bool CXFA_FFWidgetHandler::Undo(CXFA_FFWidget* widget) {
+  return widget->Undo();
+}
+
+bool CXFA_FFWidgetHandler::Redo(CXFA_FFWidget* widget) {
+  return widget->Redo();
+}
+
 FWL_WidgetHit CXFA_FFWidgetHandler::OnHitTest(CXFA_FFWidget* hWidget,
                                               const CFX_PointF& point) {
   if (!(hWidget->GetStatus() & XFA_WidgetStatus_Visible))
diff --git a/xfa/fxfa/cxfa_ffwidgethandler.h b/xfa/fxfa/cxfa_ffwidgethandler.h
index ba6a5a26ca..975f3607e4 100644
--- a/xfa/fxfa/cxfa_ffwidgethandler.h
+++ b/xfa/fxfa/cxfa_ffwidgethandler.h
@@ -58,6 +58,11 @@ class CXFA_FFWidgetHandler {
   WideString GetSelectedText(CXFA_FFWidget* widget);
   void PasteText(CXFA_FFWidget* widget, const WideString& text);
 
+  bool CanUndo(CXFA_FFWidget* widget);
+  bool CanRedo(CXFA_FFWidget* widget);
+  bool Undo(CXFA_FFWidget* widget);
+  bool Redo(CXFA_FFWidget* widget);
+
   bool OnKeyDown(CXFA_FFWidget* hWidget, uint32_t dwKeyCode, uint32_t dwFlags);
   bool OnKeyUp(CXFA_FFWidget* hWidget, uint32_t dwKeyCode, uint32_t dwFlags);
   bool OnChar(CXFA_FFWidget* hWidget, uint32_t dwChar, uint32_t dwFlags);