Convert FWL_ERR into an enum class.

xfa/fwl/basewidget/fwl_checkboximp.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_CHECKBOXIMP_H_
 #define XFA_FWL_BASEWIDGET_FWL_CHECKBOXIMP_H_
 
 #include "xfa/fwl/core/fwl_widgetimp.h"
 
 class CFWL_CheckBoxImpDelegate;
 class CFWL_MsgMouse;
 class CFWL_WidgetImpProperties;
 class IFWL_Widget;
 
 class CFWL_CheckBoxImp : public CFWL_WidgetImp {
  public:
   CFWL_CheckBoxImp(const CFWL_WidgetImpProperties& properties,
                    IFWL_Widget* pOuter);
   ~CFWL_CheckBoxImp();
-  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_ERR DrawWidget(CFX_Graphics* pGraphics,
-                             const CFX_Matrix* pMatrix = NULL);
+  virtual FWL_Error Initialize();
+  virtual FWL_Error Finalize();
+  virtual FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE);
+  virtual FWL_Error Update();
+  virtual FWL_Error DrawWidget(CFX_Graphics* pGraphics,
+                               const CFX_Matrix* pMatrix = NULL);
   virtual int32_t GetCheckState();
-  virtual FWL_ERR SetCheckState(int32_t iCheck);
+  virtual FWL_Error SetCheckState(int32_t iCheck);
 
  protected:
   void Layout();
   uint32_t GetPartStates();
   void UpdateTextOutStyles();
   void NextStates();
   CFX_RectF m_rtClient;
   CFX_RectF m_rtBox;
   CFX_RectF m_rtCaption;
   CFX_RectF m_rtFocus;
   uint32_t m_dwTTOStyles;
   int32_t m_iTTOAlign;
   FX_BOOL m_bBtnDown;
   friend class CFWL_CheckBoxImpDelegate;
 };
 class CFWL_CheckBoxImpDelegate : public CFWL_WidgetImpDelegate {
  public:
   CFWL_CheckBoxImpDelegate(CFWL_CheckBoxImp* pOwner);
-  int32_t OnProcessMessage(CFWL_Message* pMessage) override;
-  FWL_ERR OnDrawWidget(CFX_Graphics* pGraphics,
-                       const CFX_Matrix* pMatrix = NULL) override;
+  void OnProcessMessage(CFWL_Message* pMessage) override;
+  void OnDrawWidget(CFX_Graphics* pGraphics,
+                    const CFX_Matrix* pMatrix = NULL) override;
 
  protected:
   void OnActivate(CFWL_Message* pMsg);
   void OnFocusChanged(CFWL_Message* pMsg, FX_BOOL bSet = TRUE);
   void OnLButtonDown(CFWL_MsgMouse* pMsg);
   void OnLButtonUp(CFWL_MsgMouse* pMsg);
   void OnMouseMove(CFWL_MsgMouse* pMsg);
   void OnMouseLeave(CFWL_MsgMouse* pMsg);
   void OnKeyDown(CFWL_MsgKey* pMsg);
   CFWL_CheckBoxImp* m_pOwner;
 };
 
 #endif  // XFA_FWL_BASEWIDGET_FWL_CHECKBOXIMP_H_