Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_pushbuttonimp.h

Index: xfa/fwl/basewidget/fwl_pushbuttonimp.h
diff --git a/xfa/fwl/basewidget/fwl_pushbuttonimp.h b/xfa/fwl/basewidget/fwl_pushbuttonimp.h
index be6941249cbdff4af200918d96058801bf54dad1..4479423e66c1a7f4ff31dd806d767b35765726c4 100644
--- a/xfa/fwl/basewidget/fwl_pushbuttonimp.h
+++ b/xfa/fwl/basewidget/fwl_pushbuttonimp.h
@@ -8,6 +8,7 @@
 #define XFA_FWL_BASEWIDGET_FWL_PUSHBUTTONIMP_H_
 
 #include "xfa/fwl/core/fwl_widgetimp.h"
+#include "xfa/fwl/core/ifwl_widget.h"
 
 class CFWL_MsgMouse;
 class CFWL_WidgetImpProperties;
@@ -18,18 +19,22 @@ class CFWL_PushButtonImp : public CFWL_WidgetImp {
  public:
   CFWL_PushButtonImp(const CFWL_WidgetImpProperties& properties,
                      IFWL_Widget* pOuter);
-  virtual ~CFWL_PushButtonImp();
-  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 SetStates(uint32_t dwStates, FX_BOOL bSet = TRUE);
-  virtual FWL_ERR Update();
-  virtual FWL_ERR DrawWidget(CFX_Graphics* pGraphics,
-                             const CFX_Matrix* pMatrix = NULL);
+  ~CFWL_PushButtonImp() override;
+
+  // CFWL_WidgetImp
+  FWL_ERR GetClassName(CFX_WideString& wsClass) const override;
+  FWL_Type GetClassID() const override { return FWL_Type::PushButton; }
+  FWL_ERR Initialize() override;
+  FWL_ERR Finalize() override;
+  FWL_ERR GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE) override;
+  FWL_ERR SetStates(uint32_t dwStates, FX_BOOL bSet = TRUE) override;
+  FWL_ERR Update() override;
+  FWL_ERR DrawWidget(CFX_Graphics* pGraphics,
+                     const CFX_Matrix* pMatrix = nullptr) override;
 
  protected:
+  friend class CFWL_PushButtonImpDelegate;
+
   void DrawBkground(CFX_Graphics* pGraphics,
                     IFWL_ThemeProvider* pTheme,
                     const CFX_Matrix* pMatrix);
@@ -38,12 +43,12 @@ class CFWL_PushButtonImp : public CFWL_WidgetImp {
                 const CFX_Matrix* pMatrix);
   uint32_t GetPartStates();
   void UpdateTextOutStyles();
+
   CFX_RectF m_rtClient;
   CFX_RectF m_rtCaption;
   FX_BOOL m_bBtnDown;
   uint32_t m_dwTTOStyles;
   int32_t m_iTTOAlign;
-  friend class CFWL_PushButtonImpDelegate;
 };
 
 class CFWL_PushButtonImpDelegate : public CFWL_WidgetImpDelegate {