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, 20 insertions, 0 deletions

diff --git a/xfa/fxfa/cxfa_ffdatetimeedit.h b/xfa/fxfa/cxfa_ffdatetimeedit.h
index a549cbb80f..8041b313de 100644
--- a/xfa/fxfa/cxfa_ffdatetimeedit.h
+++ b/xfa/fxfa/cxfa_ffdatetimeedit.h
@@ -16,6 +16,7 @@ enum XFA_DATETIMETYPE {
   XFA_DATETIMETYPE_DateAndTime
 };
 
+class CFWL_DateTimePicker;
 class CFWL_Event;
 class CFWL_Widget;
 
@@ -35,12 +36,31 @@ class CXFA_FFDateTimeEdit : public CXFA_FFTextEdit {
                        int32_t iMonth,
                        int32_t iDay);
 
+  // CXFA_FFWidget
+  bool CanUndo() override;
+  bool CanRedo() override;
+  bool Undo() override;
+  bool Redo() override;
+  bool CanCopy() override;
+  bool CanCut() override;
+  bool CanPaste() override;
+  bool CanSelectAll() override;
+  Optional<WideString> Copy() override;
+  Optional<WideString> Cut() override;
+  bool Paste(const WideString& wsPaste) override;
+  void SelectAll() override;
+  void Delete() override;
+  void DeSelect() override;
+  WideString GetText() override;
+
  private:
   bool PtInActiveRect(const CFX_PointF& point) override;
   bool CommitData() override;
   bool UpdateFWLData() override;
   bool IsDataChanged() override;
 
+  CFWL_DateTimePicker* GetPickerWidget();
+
   uint32_t GetAlignment();
 };