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diff --git a/fpdfsdk/fpdfxfa/include/cpdfxfa_docenvironment.h b/fpdfsdk/fpdfxfa/include/cpdfxfa_docenvironment.h
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index 0000000000..f6a538f816
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+++ b/fpdfsdk/fpdfxfa/include/cpdfxfa_docenvironment.h
@@ -0,0 +1,114 @@
+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef FPDFSDK_FPDFXFA_INCLUDE_CPDFXFA_DOCENVIRONMENT_H_
+#define FPDFSDK_FPDFXFA_INCLUDE_CPDFXFA_DOCENVIRONMENT_H_
+
+#include "public/fpdfview.h"
+#include "xfa/fxfa/include/fxfa.h"
+
+class CPDFXFA_Document;
+class IJS_Context;
+
+class CPDFXFA_DocEnvironment : public IXFA_DocEnvironment {
+ public:
+  CPDFXFA_DocEnvironment(CPDFXFA_Document*);
+  ~CPDFXFA_DocEnvironment() override;
+
+  // IXFA_DocEnvironment
+  void SetChangeMark(CXFA_FFDoc* hDoc) override;
+  // used in dynamic xfa, dwFlags refer to XFA_INVALIDATE_XXX macros.
+  void InvalidateRect(CXFA_FFPageView* pPageView,
+                      const CFX_RectF& rt,
+                      uint32_t dwFlags) override;
+  // show or hide caret
+  void DisplayCaret(CXFA_FFWidget* hWidget,
+                    FX_BOOL bVisible,
+                    const CFX_RectF* pRtAnchor) override;
+  // dwPos: (0:bottom 1:top)
+  FX_BOOL GetPopupPos(CXFA_FFWidget* hWidget,
+                      FX_FLOAT fMinPopup,
+                      FX_FLOAT fMaxPopup,
+                      const CFX_RectF& rtAnchor,
+                      CFX_RectF& rtPopup) override;
+  FX_BOOL PopupMenu(CXFA_FFWidget* hWidget, CFX_PointF ptPopup) override;
+
+  // dwFlags XFA_PAGEVIEWEVENT_Added, XFA_PAGEVIEWEVENT_Removing
+  void PageViewEvent(CXFA_FFPageView* pPageView, uint32_t dwFlags) override;
+  void WidgetPostAdd(CXFA_FFWidget* hWidget,
+                     CXFA_WidgetAcc* pWidgetData) override;
+  void WidgetPreRemove(CXFA_FFWidget* hWidget,
+                       CXFA_WidgetAcc* pWidgetData) override;
+
+  // Host method
+  int32_t CountPages(CXFA_FFDoc* hDoc) override;
+  int32_t GetCurrentPage(CXFA_FFDoc* hDoc) override;
+  void SetCurrentPage(CXFA_FFDoc* hDoc, int32_t iCurPage) override;
+  FX_BOOL IsCalculationsEnabled(CXFA_FFDoc* hDoc) override;
+  void SetCalculationsEnabled(CXFA_FFDoc* hDoc, FX_BOOL bEnabled) override;
+  void GetTitle(CXFA_FFDoc* hDoc, CFX_WideString& wsTitle) override;
+  void SetTitle(CXFA_FFDoc* hDoc, const CFX_WideString& wsTitle) override;
+  void ExportData(CXFA_FFDoc* hDoc,
+                  const CFX_WideString& wsFilePath,
+                  FX_BOOL bXDP) override;
+  void GotoURL(CXFA_FFDoc* hDoc,
+               const CFX_WideString& bsURL,
+               FX_BOOL bAppend) override;
+  FX_BOOL IsValidationsEnabled(CXFA_FFDoc* hDoc) override;
+  void SetValidationsEnabled(CXFA_FFDoc* hDoc, FX_BOOL bEnabled) override;
+  void SetFocusWidget(CXFA_FFDoc* hDoc, CXFA_FFWidget* hWidget) override;
+  void Print(CXFA_FFDoc* hDoc,
+             int32_t nStartPage,
+             int32_t nEndPage,
+             uint32_t dwOptions) override;
+  FX_ARGB GetHighlightColor(CXFA_FFDoc* hDoc) override;
+
+  /**
+   *Submit data to email, http, ftp.
+   * @param[in] hDoc The document handler.
+   * @param[in] eFormat Determines the format in which the data will be
+   *submitted. XFA_ATTRIBUTEENUM_Xdp, XFA_ATTRIBUTEENUM_Xml...
+   * @param[in] wsTarget The URL to which the data will be submitted.
+   * @param[in] eEncoding The encoding of text content.
+   * @param[in] pXDPContent Controls what subset of the data is submitted, used
+   *only when the format property is xdp.
+   * @param[in] bEmbedPDF, specifies whether PDF is embedded in the submitted
+   *content or not.
+   */
+  FX_BOOL SubmitData(CXFA_FFDoc* hDoc, CXFA_Submit submit) override;
+
+  FX_BOOL GetGlobalProperty(CXFA_FFDoc* hDoc,
+                            const CFX_ByteStringC& szPropName,
+                            CFXJSE_Value* pValue) override;
+  FX_BOOL SetGlobalProperty(CXFA_FFDoc* hDoc,
+                            const CFX_ByteStringC& szPropName,
+                            CFXJSE_Value* pValue) override;
+
+  IFX_FileRead* OpenLinkedFile(CXFA_FFDoc* hDoc,
+                               const CFX_WideString& wsLink) override;
+
+ private:
+  FX_BOOL OnBeforeNotifySubmit();
+  void OnAfterNotifySubmit();
+  FX_BOOL NotifySubmit(FX_BOOL bPrevOrPost);
+  FX_BOOL SubmitDataInternal(CXFA_FFDoc* hDoc, CXFA_Submit submit);
+  FX_BOOL MailToInfo(CFX_WideString& csURL,
+                     CFX_WideString& csToAddress,
+                     CFX_WideString& csCCAddress,
+                     CFX_WideString& csBCCAddress,
+                     CFX_WideString& csSubject,
+                     CFX_WideString& csMsg);
+  FX_BOOL ExportSubmitFile(FPDF_FILEHANDLER* ppFileHandler,
+                           int fileType,
+                           FPDF_DWORD encodeType,
+                           FPDF_DWORD flag);
+  void ToXFAContentFlags(CFX_WideString csSrcContent, FPDF_DWORD& flag);
+
+  CPDFXFA_Document* const m_pDocument;  // Not owned;
+  IJS_Context* m_pJSContext;
+};
+
+#endif  // FPDFSDK_FPDFXFA_INCLUDE_CPDFXFA_DOCENVIRONMENT_H_