Fix crash when typing letters into an XFA datetime field.

The root of the issue is that CXFA_FFDateTimeEdit inherits from
CXFA_FFTextEdit and methods in the former treat its widget as a
CFWL_Edit, while it can be a CFWL_DateTimePicker.

Bug: chromium:857521
Change-Id: I764b6c03095b16f6a9cf72ff36768ca4c57c4070
Reviewed-on: https://pdfium-review.googlesource.com/37910
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>

2 files changed, 55 insertions, 0 deletions

diff --git a/xfa/fwl/cfwl_datetimepicker.cpp b/xfa/fwl/cfwl_datetimepicker.cpp
index 8c37e1dbe8..0af01fb2a1 100644
--- a/xfa/fwl/cfwl_datetimepicker.cpp
+++ b/xfa/fwl/cfwl_datetimepicker.cpp
@@ -178,6 +178,10 @@ WideString CFWL_DateTimePicker::GetEditText() const {
   return m_pEdit ? m_pEdit->GetText() : L"";
 }
 
+int32_t CFWL_DateTimePicker::GetEditTextLength() const {
+  return m_pEdit ? m_pEdit->GetTextLength() : 0;
+}
+
 CFX_RectF CFWL_DateTimePicker::GetBBox() const {
   CFX_RectF rect = m_pProperties->m_rtWidget;
   if (NeedsToShowButton())
@@ -460,3 +464,43 @@ void CFWL_DateTimePicker::GetPopupPos(float fMinHeight,
   m_pWidgetMgr->GetAdapterPopupPos(this, fMinHeight, fMaxHeight, rtAnchor,
                                    pPopupRect);
 }
+
+void CFWL_DateTimePicker::ClearText() {
+  m_pEdit->ClearText();
+}
+
+void CFWL_DateTimePicker::SelectAll() {
+  m_pEdit->SelectAll();
+}
+
+void CFWL_DateTimePicker::ClearSelection() {
+  m_pEdit->ClearSelection();
+}
+
+Optional<WideString> CFWL_DateTimePicker::Copy() {
+  return m_pEdit->Copy();
+}
+
+Optional<WideString> CFWL_DateTimePicker::Cut() {
+  return m_pEdit->Cut();
+}
+
+bool CFWL_DateTimePicker::Paste(const WideString& wsPaste) {
+  return m_pEdit->Paste(wsPaste);
+}
+
+bool CFWL_DateTimePicker::Undo() {
+  return m_pEdit->Undo();
+}
+
+bool CFWL_DateTimePicker::Redo() {
+  return m_pEdit->Redo();
+}
+
+bool CFWL_DateTimePicker::CanUndo() {
+  return m_pEdit->CanUndo();
+}
+
+bool CFWL_DateTimePicker::CanRedo() {
+  return m_pEdit->CanRedo();
+}
diff --git a/xfa/fwl/cfwl_datetimepicker.h b/xfa/fwl/cfwl_datetimepicker.h
index 00e7f61d73..f80f09d1bf 100644
--- a/xfa/fwl/cfwl_datetimepicker.h
+++ b/xfa/fwl/cfwl_datetimepicker.h
@@ -49,13 +49,24 @@ class CFWL_DateTimePicker : public CFWL_Widget {
   void SetCurSel(int32_t iYear, int32_t iMonth, int32_t iDay);
 
   void SetEditText(const WideString& wsText);
+  int32_t GetEditTextLength() const;
   WideString GetEditText() const;
+  void ClearText();
 
+  void SelectAll();
+  void ClearSelection();
   bool HasSelection() const { return m_pEdit->HasSelection(); }
   // Returns <start, count> of the selection.
   std::pair<size_t, size_t> GetSelection() const {
     return m_pEdit->GetSelection();
   }
+  Optional<WideString> Copy();
+  Optional<WideString> Cut();
+  bool Paste(const WideString& wsPaste);
+  bool Undo();
+  bool Redo();
+  bool CanUndo();
+  bool CanRedo();
 
   CFX_RectF GetBBox() const;
   void SetEditLimit(int32_t nLimit) { m_pEdit->SetLimit(nLimit); }