Change IFWL_Widget to store a single delegate.

xfa/fxfa/app/xfa_ffchoicelist.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_FFCHOICELIST_H_
 #define XFA_FXFA_APP_XFA_FFCHOICELIST_H_
 
 #include "xfa/fxfa/app/xfa_fffield.h"
 #include "xfa/fxfa/xfa_ffpageview.h"
 
 class CXFA_FFListBox : public CXFA_FFField {
  public:
   CXFA_FFListBox(CXFA_FFPageView* pPageView, CXFA_WidgetAcc* pDataAcc);
   ~CXFA_FFListBox() override;
 
   // CXFA_FFField
   FX_BOOL LoadWidget() override;
   FX_BOOL OnKillFocus(CXFA_FFWidget* pNewWidget) override;
-  void OnProcessMessage(CFWL_Message* pMessage) override;
-  void OnProcessEvent(CFWL_Event* pEvent) override;
-  void OnDrawWidget(CFX_Graphics* pGraphics,
-                    const CFX_Matrix* pMatrix = nullptr) override;
 
   void OnSelectChanged(IFWL_Widget* pWidget, const CFX_Int32Array& arrSels);
   void SetItemState(int32_t nIndex, FX_BOOL bSelected);
   void InsertItem(const CFX_WideStringC& wsLabel, int32_t nIndex = -1);
   void DeleteItem(int32_t nIndex);
 
  protected:
   FX_BOOL CommitData() override;
   FX_BOOL UpdateFWLData() override;
   FX_BOOL IsDataChanged() override;
 
   uint32_t GetAlignment();
-
-  IFWL_WidgetDelegate* m_pOldDelegate;
 };
 
 class CXFA_FFComboBox : public CXFA_FFField {
  public:
   CXFA_FFComboBox(CXFA_FFPageView* pPageView, CXFA_WidgetAcc* pDataAcc);
   ~CXFA_FFComboBox() override;
 
   // CXFA_FFField
   FX_BOOL GetBBox(CFX_RectF& rtBox,
                   uint32_t dwStatus,
@@ skipping 11 matching lines @@
   FX_BOOL CanCut() override;
   FX_BOOL CanPaste() override;
   FX_BOOL CanSelectAll() override;
   FX_BOOL Copy(CFX_WideString& wsCopy) override;
   FX_BOOL Cut(CFX_WideString& wsCut) override;
   FX_BOOL Paste(const CFX_WideString& wsPaste) override;
   FX_BOOL SelectAll() override;
   FX_BOOL Delete() override;
   FX_BOOL DeSelect() override;
 
-  // IFWL_WidgetDelegate
-  void OnProcessMessage(CFWL_Message* pMessage) override;
-  void OnProcessEvent(CFWL_Event* pEvent) override;
-  void OnDrawWidget(CFX_Graphics* pGraphics,
-                    const CFX_Matrix* pMatrix = nullptr) override;
-
   virtual void OpenDropDownList();
 
   void OnTextChanged(IFWL_Widget* pWidget, const CFX_WideString& wsChanged);
   void OnSelectChanged(IFWL_Widget* pWidget,
                        const CFX_Int32Array& arrSels,
                        FX_BOOL bLButtonUp);
   void OnPreOpen(IFWL_Widget* pWidget);
   void OnPostOpen(IFWL_Widget* pWidget);
   void SetItemState(int32_t nIndex, FX_BOOL bSelected);
   void InsertItem(const CFX_WideStringC& wsLabel, int32_t nIndex = -1);
   void DeleteItem(int32_t nIndex);
 
  protected:
   // CXFA_FFField
   FX_BOOL PtInActiveRect(FX_FLOAT fx, FX_FLOAT fy) override;
   FX_BOOL CommitData() override;
   FX_BOOL UpdateFWLData() override;
   FX_BOOL IsDataChanged() override;
 
   uint32_t GetAlignment();
   void FWLEventSelChange(CXFA_EventParam* pParam);
 
   CFX_WideString m_wsNewValue;
-  IFWL_WidgetDelegate* m_pOldDelegate;
 };
 
 #endif  // XFA_FXFA_APP_XFA_FFCHOICELIST_H_