Convert FWL_ERR into an enum class.

xfa/fwl/basewidget/fwl_listboximp.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_BASEWIDGET_FWL_LISTBOXIMP_H_
 #define XFA_FWL_BASEWIDGET_FWL_LISTBOXIMP_H_
 
 #include <memory>
 
 #include "xfa/fwl/basewidget/ifwl_combobox.h"
 #include "xfa/fwl/basewidget/ifwl_edit.h"
 #include "xfa/fwl/basewidget/ifwl_listbox.h"
 #include "xfa/fwl/basewidget/ifwl_scrollbar.h"
 #include "xfa/fwl/core/fwl_widgetimp.h"
 
 class CFWL_ListBoxImpDelegate;
 class CFWL_MsgKillFocus;
 class CFWL_MsgMouse;
 class CFWL_MsgMouseWheel;
 
 class CFWL_ListBoxImp : public CFWL_WidgetImp {
  public:
   CFWL_ListBoxImp(const CFWL_WidgetImpProperties& properties,
                   IFWL_Widget* pOuter);
   ~CFWL_ListBoxImp();
-  virtual FWL_ERR GetClassName(CFX_WideString& wsClass) const;
+  virtual FWL_Error GetClassName(CFX_WideString& wsClass) const;
   virtual uint32_t GetClassID() const;
-  virtual FWL_ERR Initialize();
-  virtual FWL_ERR Finalize();
-  virtual FWL_ERR GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE);
-  virtual FWL_ERR Update();
+  virtual FWL_Error Initialize();
+  virtual FWL_Error Finalize();
+  virtual FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE);
+  virtual FWL_Error Update();
   virtual uint32_t HitTest(FX_FLOAT fx, FX_FLOAT fy);
-  virtual FWL_ERR DrawWidget(CFX_Graphics* pGraphics,
-                             const CFX_Matrix* pMatrix = NULL);
-  virtual FWL_ERR SetThemeProvider(IFWL_ThemeProvider* pThemeProvider);
+  virtual FWL_Error DrawWidget(CFX_Graphics* pGraphics,
+                               const CFX_Matrix* pMatrix = NULL);
+  virtual FWL_Error SetThemeProvider(IFWL_ThemeProvider* pThemeProvider);
   virtual int32_t CountSelItems();
   virtual FWL_HLISTITEM GetSelItem(int32_t nIndexSel);
   virtual int32_t GetSelIndex(int32_t nIndex);
-  virtual FWL_ERR SetSelItem(FWL_HLISTITEM hItem, FX_BOOL bSelect = TRUE);
-  virtual FWL_ERR GetItemText(FWL_HLISTITEM hItem, CFX_WideString& wsText);
-  virtual FWL_ERR GetScrollPos(FX_FLOAT& fPos, FX_BOOL bVert = TRUE);
-  virtual FWL_ERR* Sort(IFWL_ListBoxCompare* pCom);
+  virtual FWL_Error SetSelItem(FWL_HLISTITEM hItem, FX_BOOL bSelect = TRUE);
+  virtual FWL_Error GetItemText(FWL_HLISTITEM hItem, CFX_WideString& wsText);
+  virtual FWL_Error GetScrollPos(FX_FLOAT& fPos, FX_BOOL bVert = TRUE);
+  virtual FWL_Error Sort(IFWL_ListBoxCompare* pCom);
 
  protected:
   FWL_HLISTITEM GetItem(FWL_HLISTITEM hItem, uint32_t dwKeyCode);
   void SetSelection(FWL_HLISTITEM hStart,
                     FWL_HLISTITEM hEnd,
                     FX_BOOL bSelected);
   void SetSelectionDirect(FWL_HLISTITEM hItem, FX_BOOL bSelect);
   FX_BOOL IsItemSelected(FWL_HLISTITEM hItem);
   void ClearSelection();
   void SelectAll();
@@ skipping 43 matching lines @@
   FX_FLOAT m_fItemHeight;
   FX_FLOAT m_fScorllBarWidth;
   FX_BOOL m_bLButtonDown;
   IFWL_ThemeProvider* m_pScrollBarTP;
   friend class CFWL_ListBoxImpDelegate;
 };
 class CFWL_ListBoxImpDelegate : public CFWL_WidgetImpDelegate {
  public:
   CFWL_ListBoxImpDelegate(CFWL_ListBoxImp* pOwner);
   int32_t OnProcessMessage(CFWL_Message* pMessage) override;
-  FWL_ERR OnProcessEvent(CFWL_Event* pEvent) override;
-  FWL_ERR OnDrawWidget(CFX_Graphics* pGraphics,
-                       const CFX_Matrix* pMatrix = NULL) override;
+  FWL_Error OnProcessEvent(CFWL_Event* pEvent) override;
+  FWL_Error OnDrawWidget(CFX_Graphics* pGraphics,
+                         const CFX_Matrix* pMatrix = NULL) override;
 
  protected:
   void OnFocusChanged(CFWL_Message* pMsg, FX_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(FWL_HLISTITEM hItem, FX_BOOL bShift, FX_BOOL bCtrl);
   FX_BOOL OnScroll(IFWL_ScrollBar* pScrollBar, uint32_t dwCode, FX_FLOAT fPos);
   void DispatchSelChangedEv();
   CFWL_ListBoxImp* m_pOwner;
 };
 
 #endif  // XFA_FWL_BASEWIDGET_FWL_LISTBOXIMP_H_