Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_listboximp.h

Index: xfa/fwl/basewidget/fwl_listboximp.h
diff --git a/xfa/fwl/basewidget/fwl_listboximp.h b/xfa/fwl/basewidget/fwl_listboximp.h
index 65fbf6a45a361116395b674509a647443d480ad6..60838fbf583bd2d4c29a49ced46698f3c7a6e07a 100644
--- a/xfa/fwl/basewidget/fwl_listboximp.h
+++ b/xfa/fwl/basewidget/fwl_listboximp.h
@@ -24,26 +24,31 @@ 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 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_WidgetHit 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 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);
+  ~CFWL_ListBoxImp() override;
+
+  // CFWL_WidgetImp
+  FWL_ERR GetClassName(CFX_WideString& wsClass) const override;
+  FWL_Type GetClassID() const override { return FWL_Type::ListBox; }
+  FWL_ERR Initialize() override;
+  FWL_ERR Finalize() override;
+  FWL_ERR GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE) override;
+  FWL_ERR Update() override;
+  FWL_WidgetHit HitTest(FX_FLOAT fx, FX_FLOAT fy) override;
+  FWL_ERR DrawWidget(CFX_Graphics* pGraphics,
+                     const CFX_Matrix* pMatrix = nullptr) override;
+  FWL_ERR SetThemeProvider(IFWL_ThemeProvider* pThemeProvider) override;
+
+  int32_t CountSelItems();
+  FWL_HLISTITEM GetSelItem(int32_t nIndexSel);
+  int32_t GetSelIndex(int32_t nIndex);
+  FWL_ERR SetSelItem(FWL_HLISTITEM hItem, FX_BOOL bSelect = TRUE);
+  FWL_ERR GetItemText(FWL_HLISTITEM hItem, CFX_WideString& wsText);
+  FWL_ERR GetScrollPos(FX_FLOAT& fPos, FX_BOOL bVert = TRUE);
+  FWL_ERR* Sort(IFWL_ListBoxCompare* pCom);
 
  protected:
+  friend class CFWL_ListBoxImpDelegate;
+
   FWL_HLISTITEM GetItem(FWL_HLISTITEM hItem, uint32_t dwKeyCode);
   void SetSelection(FWL_HLISTITEM hStart,
                     FWL_HLISTITEM hEnd,
@@ -86,7 +91,6 @@ class CFWL_ListBoxImp : public CFWL_WidgetImp {
   FX_BOOL IsShowScrollBar(FX_BOOL bVert);
   void ProcessSelChanged();
 
- protected:
   CFX_RectF m_rtClient;
   CFX_RectF m_rtStatic;
   CFX_RectF m_rtConent;
@@ -99,7 +103,6 @@ class CFWL_ListBoxImp : public CFWL_WidgetImp {
   FX_FLOAT m_fScorllBarWidth;
   FX_BOOL m_bLButtonDown;
   IFWL_ThemeProvider* m_pScrollBarTP;
-  friend class CFWL_ListBoxImpDelegate;
 };
 class CFWL_ListBoxImpDelegate : public CFWL_WidgetImpDelegate {
  public: