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>

1 files changed, 11 insertions, 0 deletions

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); }