Remove unused sysbtn code

xfa/fwl/cfwl_form.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_CFWL_FORM_H_
 #define XFA_FWL_CFWL_FORM_H_
 
 #include <memory>
 
 #include "core/fxcrt/fx_system.h"
 #include "xfa/fwl/cfwl_widget.h"
 #include "xfa/fwl/cfwl_widgetproperties.h"
 
 #define FWL_CLASS_Form L"FWL_FORM"
 #define FWL_CLASS_FormProxy L"FWL_FORMPROXY"
 
 #if (_FX_OS_ == _FX_MACOSX_)
 #define FWL_UseMacSystemBorder
 #endif
 
 class CFWL_MessageMouse;
 class CFWL_NoteLoop;
 class CFWL_Widget;
 class IFWL_ThemeProvider;
-class CFWL_SysBtn;
 
 class CFWL_Form : public CFWL_Widget {
  public:
   CFWL_Form(const CFWL_App* app,
             std::unique_ptr<CFWL_WidgetProperties> properties,
             CFWL_Widget* pOuter);
   ~CFWL_Form() override;
 
   // CFWL_Widget
   FWL_Type GetClassID() const override;
   bool IsInstance(const CFX_WideStringC& wsClass) const override;
   CFX_RectF GetClientRect() override;
   void Update() override;
   FWL_WidgetHit HitTest(FX_FLOAT fx, FX_FLOAT fy) override;
   void DrawWidget(CFX_Graphics* pGraphics, const CFX_Matrix* pMatrix) override;
   void OnProcessMessage(CFWL_Message* pMessage) override;
   void OnDrawWidget(CFX_Graphics* pGraphics,
                     const CFX_Matrix* pMatrix) override;
 
   CFWL_Widget* DoModal();
   void EndDoModal();
 
   CFWL_Widget* GetSubFocus() const { return m_pSubFocus; }
   void SetSubFocus(CFWL_Widget* pWidget) { m_pSubFocus = pWidget; }
 
  private:
   void DrawBackground(CFX_Graphics* pGraphics, IFWL_ThemeProvider* pTheme);
-  void RemoveSysButtons();
-  CFWL_SysBtn* GetSysBtnAtPoint(FX_FLOAT fx, FX_FLOAT fy);
-  CFWL_SysBtn* GetSysBtnByState(uint32_t dwState);
-  CFWL_SysBtn* GetSysBtnByIndex(int32_t nIndex);
-  int32_t GetSysBtnIndex(CFWL_SysBtn* pBtn);
   CFX_RectF GetEdgeRect();
   void SetWorkAreaRect();
   void Layout();
-  void ResetSysBtn();
   void RegisterForm();
   void UnRegisterForm();
   void OnLButtonDown(CFWL_MessageMouse* pMsg);
   void OnLButtonUp(CFWL_MessageMouse* pMsg);
-  void OnMouseMove(CFWL_MessageMouse* pMsg);
-  void OnMouseLeave(CFWL_MessageMouse* pMsg);
 
-#if (_FX_OS_ == _FX_MACOSX_)
-  bool m_bMouseIn;
-#endif
   CFX_RectF m_rtRestore;
   CFX_RectF m_rtRelative;
-  CFWL_SysBtn* m_pCloseBox;
-  CFWL_SysBtn* m_pMinBox;
-  CFWL_SysBtn* m_pMaxBox;
   std::unique_ptr<CFWL_NoteLoop> m_pNoteLoop;
   CFWL_Widget* m_pSubFocus;
   FX_FLOAT m_fCXBorder;
   FX_FLOAT m_fCYBorder;
-  int32_t m_iCaptureBtn;
-  int32_t m_iSysBox;
-  bool m_bLButtonDown;
-  bool m_bMaximized;
-  bool m_bSetMaximize;
-  bool m_bDoModalFlag;
 };
 
 #endif  // XFA_FWL_CFWL_FORM_H_