Cleanup FWL Event and Message code.

xfa/fwl/core/cfwl_listbox.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_FWL_CORE_CFWL_LISTBOX_H_
 #define XFA_FWL_CORE_CFWL_LISTBOX_H_
 
 #include <memory>
@@ skipping 130 matching lines @@
                    bool bAutoSize = false);
   FX_FLOAT GetMaxTextWidth();
   FX_FLOAT GetScrollWidth();
 
   void OnFocusChanged(CFWL_Message* pMsg, bool bSet = true);
   void OnLButtonDown(CFWL_MsgMouse* pMsg);
   void OnLButtonUp(CFWL_MsgMouse* pMsg);
   void OnMouseWheel(CFWL_MsgMouseWheel* pMsg);
   void OnKeyDown(CFWL_MsgKey* pMsg);
   void OnVK(CFWL_ListItem* hItem, bool bShift, bool bCtrl);
-  bool OnScroll(CFWL_ScrollBar* pScrollBar, FWL_SCBCODE dwCode, FX_FLOAT fPos);
+  bool OnScroll(CFWL_ScrollBar* pScrollBar,
+                CFWL_EvtScroll::Code dwCode,
+                FX_FLOAT fPos);
 
   CFX_RectF m_rtClient;
   CFX_RectF m_rtStatic;
   CFX_RectF m_rtConent;
   std::unique_ptr<CFWL_ScrollBar> m_pHorzScrollBar;
   std::unique_ptr<CFWL_ScrollBar> m_pVertScrollBar;
   uint32_t m_dwTTOStyles;
   int32_t m_iTTOAligns;
   CFWL_ListItem* m_hAnchor;
   FX_FLOAT m_fItemHeight;
   FX_FLOAT m_fScorllBarWidth;
   bool m_bLButtonDown;
   IFWL_ThemeProvider* m_pScrollBarTP;
   std::vector<std::unique_ptr<CFWL_ListItem>> m_ItemArray;
 };
 
 #endif  // XFA_FWL_CORE_CFWL_LISTBOX_H_