Simplify XFA event handling.

xfa/fxfa/app/xfa_ffnotify.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 XFA_FXFA_APP_XFA_FFNOTIFY_H_
 #define XFA_FXFA_APP_XFA_FFNOTIFY_H_
 
 #include "xfa/fxfa/parser/xfa_document.h"
 
 class CXFA_FFWidgetHandler;
 
 class CXFA_FFNotify {
  public:
   CXFA_FFNotify(CXFA_FFDoc* pDoc);
   ~CXFA_FFNotify();
 
-  void OnPageEvent(CXFA_ContainerLayoutItem* pSender,
-                   XFA_PAGEEVENT eEvent,
-                   void* pParam = NULL);
+  void OnPageEvent(CXFA_ContainerLayoutItem* pSender, uint32_t dwEvent);
 
-  void OnNodeEvent(CXFA_Node* pSender,
-                   XFA_NODEEVENT eEvent,
-                   void* pParam = NULL,
-                   void* pParam2 = NULL,
-                   void* pParam3 = NULL,
-                   void* pParam4 = NULL);
+  // Node events
+  void OnNodeReady(CXFA_Node* pNode);
+  void OnValueChanging(CXFA_Node* pSender, XFA_ATTRIBUTE eAttr);
+  void OnValueChanged(CXFA_Node* pSender,
+                      XFA_ATTRIBUTE eAttr,
+                      CXFA_Node* pParentNode,
+                      CXFA_Node* pWidgetNode);
+  void OnChildAdded(CXFA_Node* pSender);
+  void OnChildRemoved();
+
   void OnWidgetDataEvent(CXFA_WidgetData* pSender,
                          uint32_t dwEvent,
                          void* pParam = NULL,
                          void* pAdditional = NULL,
                          void* pAdditional2 = NULL);
   CXFA_LayoutItem* OnCreateLayoutItem(CXFA_Node* pNode);
-  void OnLayoutEvent(CXFA_LayoutProcessor* pLayout,
-                     CXFA_LayoutItem* pSender,
-                     XFA_LAYOUTEVENT eEvent,
-                     void* pParam = NULL,
-                     void* pParam2 = NULL);
+  void OnLayoutItemAdd(CXFA_LayoutProcessor* pLayout,
+                       CXFA_LayoutItem* pSender,
+                       int32_t iPageIdx,
+                       uint32_t dwStatus);
+  void OnLayoutItemRemoving(CXFA_LayoutProcessor* pLayout,
+                            CXFA_LayoutItem* pSender);
 
   void StartFieldDrawLayout(CXFA_Node* pItem,
                             FX_FLOAT& fCalcWidth,
                             FX_FLOAT& fCalcHeight);
   FX_BOOL FindSplitPos(CXFA_Node* pItem,
                        int32_t iBlockIndex,
                        FX_FLOAT& fCalcHeightPos);
   FX_BOOL RunScript(CXFA_Node* pScript, CXFA_Node* pFormItem);
   int32_t ExecEventByDeepFirst(CXFA_Node* pFormNode,
                                XFA_EVENTTYPE eEventType,
                                FX_BOOL bIsFormReady = FALSE,
                                FX_BOOL bRecursive = TRUE,
                                CXFA_WidgetAcc* pExclude = NULL);
   void AddCalcValidate(CXFA_Node* pNode);
   CXFA_FFDoc* GetHDOC();
   IXFA_DocProvider* GetDocProvider();
   IXFA_AppProvider* GetAppProvider();
   CXFA_FFWidgetHandler* GetWidgetHandler();
   CXFA_FFWidget* GetHWidget(CXFA_LayoutItem* pLayoutItem);
   void OpenDropDownList(CXFA_FFWidget* hWidget);
   CFX_WideString GetCurrentDateTime();
   void ResetData(CXFA_WidgetData* pWidgetData = NULL);
   int32_t GetLayoutStatus();
   void RunNodeInitialize(CXFA_Node* pNode);
   void RunSubformIndexChange(CXFA_Node* pSubformNode);
   CXFA_Node* GetFocusWidgetNode();
   void SetFocusWidgetNode(CXFA_Node* pNode);
 
  protected:
-  void OnNodeReady(CXFA_Node* pNode);
-  void OnValueChanging(CXFA_Node* pSender, void* pParam, void* pParam2);
-  void OnValueChanged(CXFA_Node* pSender,
-                      void* pParam,
-                      void* pParam2,
-                      void* pParam3,
-                      void* pParam4);
-  void OnChildAdded(CXFA_Node* pSender, void* pParam, void* pParam2);
-  void OnChildRemoved(CXFA_Node* pSender, void* pParam, void* pParam2);
-  void OnLayoutItemAdd(CXFA_FFDocView* pDocView,
-                       CXFA_LayoutProcessor* pLayout,
-                       CXFA_LayoutItem* pSender,
-                       void* pParam,
-                       void* pParam2);
-  void OnLayoutItemRemoving(CXFA_FFDocView* pDocView,
-                            CXFA_LayoutProcessor* pLayout,
-                            CXFA_LayoutItem* pSender,
-                            void* pParam,
-                            void* pParam2);
-  void OnLayoutItemRectChanged(CXFA_FFDocView* pDocView,
-                               CXFA_LayoutProcessor* pLayout,
-                               CXFA_LayoutItem* pSender,
-                               void* pParam,
-                               void* pParam2);
-  void OnLayoutItemStatustChanged(CXFA_FFDocView* pDocView,
-                                  CXFA_LayoutProcessor* pLayout,
-                                  CXFA_LayoutItem* pSender,
-                                  void* pParam,
-                                  void* pParam2);
-  CXFA_FFDoc* m_pDoc;
+  CXFA_FFDoc* const m_pDoc;
 };
 
 #endif  // XFA_FXFA_APP_XFA_FFNOTIFY_H_