Simplify XFA event handling.

fpdfsdk/fpdfxfa/include/fpdfxfa_doc.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 FPDFSDK_FPDFXFA_INCLUDE_FPDFXFA_DOC_H_
 #define FPDFSDK_FPDFXFA_INCLUDE_FPDFXFA_DOC_H_
 
 #include <vector>
@@ skipping 55 matching lines @@
                               CFX_RectF& rtPopup);
   virtual FX_BOOL PopupMenu(CXFA_FFWidget* hWidget,
                             CFX_PointF ptPopup,
                             const CFX_RectF* pRectExclude = NULL);
 
   // dwFlags XFA_PAGEVIEWEVENT_Added, XFA_PAGEVIEWEVENT_Removing
   virtual void PageViewEvent(CXFA_FFPageView* pPageView, uint32_t dwFlags);
   // dwEvent refer to XFA_WIDGETEVENT_XXX
   virtual void WidgetEvent(CXFA_FFWidget* hWidget,
                            CXFA_WidgetAcc* pWidgetData,
-                           uint32_t dwEvent,
-                           void* pParam = NULL,
-                           void* pAdditional = NULL);
+                           uint32_t dwEvent);
 
   // return true if render it.
   virtual FX_BOOL RenderCustomWidget(CXFA_FFWidget* hWidget,
                                      CFX_Graphics* pGS,
                                      CFX_Matrix* pMatrix,
                                      const CFX_RectF& rtUI) {
     return FALSE;
   }
 
   // host method
@@ skipping 140 matching lines @@
   CXFA_FFDoc* m_pXFADoc;
   CXFA_FFDocView* m_pXFADocView;
   CPDFXFA_App* m_pApp;
   IJS_Context* m_pJSContext;
   CFX_ArrayTemplate<CPDFXFA_Page*> m_XFAPageList;
   LoadStatus m_nLoadStatus;
   int m_nPageCount;
 };
 
 #endif  // FPDFSDK_FPDFXFA_INCLUDE_FPDFXFA_DOC_H_