Hook up FFI_PageEvent.

public/fpdf_formfill.h

 // Copyright 2014 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 PUBLIC_FPDF_FORMFILL_H_
 #define PUBLIC_FPDF_FORMFILL_H_
 
 #include "fpdfview.h"
@@ skipping 800 matching lines @@
   *client area in PDF page coordinate.
   * Return value:
   *       None.
   **/
   void (*FFI_GetPageViewRect)(struct _FPDF_FORMFILLINFO* pThis,
                               FPDF_PAGE page,
                               double* left,
                               double* top,
                               double* right,
                               double* bottom);
+
+  /**
+  * Method: FFI_PageEvent
+  *     This method fires when pages have been added or deleted.
+  * Interface Version:
+  *     2
+  * Implementation Required:
+  *     yes
+  * Parameters:
+  *     pThis       -   Pointer to the interface structure itself.
+  *     page_index  -   0-based page number.
+  *     event_type  -   See FXFA_PAGEVIEWEVENT_* above.
+  * Return value:
+  *       None.
+  **/
+  void (*FFI_PageEvent)(struct _FPDF_FORMFILLINFO* pThis,
+                        int page_index,
+                        FPDF_DWORD event_type);
+
   /**
   * Method: FFI_PopupMenu
   *           This method will track the right context menu for XFA fields.
   * Interface Version:
   *           2
   * Implementation Required:
   *           yes
   * Parameters:
   *       pThis           -   Pointer to the interface structure itself.
   *       page            -   Handle to page. Returned by FPDF_LoadPage
@@ skipping 855 matching lines @@
 FPDF_StringHandleAddString(FPDF_STRINGHANDLE stringHandle,
                            FPDF_BYTESTRING bsText,
                            FPDF_DWORD size);
 #endif  // PDF_ENABLE_XFA
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif  // PUBLIC_FPDF_FORMFILL_H_