Use override in more classes in fpdfsdk/

fpdfsdk/include/pdfwindow/PWL_Wnd.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 FPDFSDK_INCLUDE_PDFWINDOW_PWL_WND_H_
 #define FPDFSDK_INCLUDE_PDFWINDOW_PWL_WND_H_
 
 #include "../../../core/include/fxcrt/fx_basic.h"
@@ skipping 266 matching lines @@
 
  private:
   CPWL_Timer* m_pTimer;
 };
 
 class CPWL_Wnd : public CPWL_TimerHandler {
   friend class CPWL_MsgControl;
 
  public:
   CPWL_Wnd();
-  virtual ~CPWL_Wnd();
+  ~CPWL_Wnd() override;
 
   void Create(const PWL_CREATEPARAM& cp);
   virtual CFX_ByteString GetClassName() const;
   void Destroy();
   void Move(const CPDF_Rect& rcNew, FX_BOOL bReset, FX_BOOL bRefresh);
   virtual void InvalidateRect(CPDF_Rect* pRect = NULL);
 
   void GetAppearanceStream(CFX_ByteString& sAppStream);
   void DrawAppearance(CFX_RenderDevice* pDevice, CPDF_Matrix* pUser2Device);
 
@@ skipping 68 matching lines @@
   FX_BOOL ClientHitTest(const CPDF_Point& point) const;
   FX_BOOL IsCaptureMouse() const;
 
   const CPWL_Wnd* GetFocused() const;
   FX_BOOL IsFocused() const;
   FX_BOOL IsReadOnly() const;
   CPWL_ScrollBar* GetVScrollBar() const;
 
   IFX_Edit_FontMap* GetFontMap() const;
   IPWL_Provider* GetProvider() const;
-  virtual IFX_SystemHandler* GetSystemHandler() const;
   IPWL_FocusHandler* GetFocusHandler() const;
 
   int32_t GetTransparency();
   void SetTransparency(int32_t nTransparency);
 
   CPDF_Matrix GetChildToRoot() const;
   CPDF_Matrix GetChildMatrix() const;
   void SetChildMatrix(const CPDF_Matrix& mt);
   CPDF_Matrix GetWindowMatrix() const;
 
   virtual CPDF_Point ChildToParent(const CPDF_Point& point) const;
   virtual CPDF_Rect ChildToParent(const CPDF_Rect& rect) const;
   virtual CPDF_Point ParentToChild(const CPDF_Point& point) const;
   virtual CPDF_Rect ParentToChild(const CPDF_Rect& rect) const;
 
   // those methods only implemented by listctrl item
   virtual FX_FLOAT GetItemHeight(FX_FLOAT fLimitWidth) { return 0; }
   virtual FX_FLOAT GetItemLeftMargin() { return 0; }
   virtual FX_FLOAT GetItemRightMargin() { return 0; }
 
   void EnableWindow(FX_BOOL bEnable);
   FX_BOOL IsEnabled();
   virtual void SetCursor();
 
  protected:
+  // CPWL_TimerHandler
+  IFX_SystemHandler* GetSystemHandler() const override;
+
   virtual void CreateChildWnd(const PWL_CREATEPARAM& cp);
   virtual void RePosChildWnd();
   void GetAppearanceStream(CFX_ByteTextBuf& sAppStream);
   virtual void GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream);
   virtual void GetChildAppearanceStream(CFX_ByteTextBuf& sAppStream);
 
   virtual void DrawThisAppearance(CFX_RenderDevice* pDevice,
                                   CPDF_Matrix* pUser2Device);
   virtual void DrawChildAppearance(CFX_RenderDevice* pDevice,
                                    CPDF_Matrix* pUser2Device);
@@ skipping 53 matching lines @@
   CPDF_Rect m_rcWindow;
   CPDF_Rect m_rcClip;
 
   FX_BOOL m_bCreated;
   FX_BOOL m_bVisible;
   FX_BOOL m_bNotifying;
   FX_BOOL m_bEnabled;
 };
 
 #endif  // FPDFSDK_INCLUDE_PDFWINDOW_PWL_WND_H_