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diff --git a/fpdfsdk/pwl/cpwl_scroll_bar.h b/fpdfsdk/pwl/cpwl_scroll_bar.h
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index 0000000000..c78b6e36f8
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+++ b/fpdfsdk/pwl/cpwl_scroll_bar.h
@@ -0,0 +1,184 @@
+// 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_PWL_CPWL_SCROLL_BAR_H_
+#define FPDFSDK_PWL_CPWL_SCROLL_BAR_H_
+
+#include "core/fxcrt/cfx_unowned_ptr.h"
+#include "fpdfsdk/pwl/cpwl_wnd.h"
+
+class CPWL_SBButton;
+class CPWL_ScrollBar;
+
+struct PWL_SCROLL_INFO {
+ public:
+  PWL_SCROLL_INFO()
+      : fContentMin(0.0f),
+        fContentMax(0.0f),
+        fPlateWidth(0.0f),
+        fBigStep(0.0f),
+        fSmallStep(0.0f) {}
+
+  bool operator==(const PWL_SCROLL_INFO& that) const {
+    return fContentMin == that.fContentMin && fContentMax == that.fContentMax &&
+           fPlateWidth == that.fPlateWidth && fBigStep == that.fBigStep &&
+           fSmallStep == that.fSmallStep;
+  }
+  bool operator!=(const PWL_SCROLL_INFO& that) const {
+    return !(*this == that);
+  }
+
+  float fContentMin;
+  float fContentMax;
+  float fPlateWidth;
+  float fBigStep;
+  float fSmallStep;
+};
+
+enum PWL_SCROLLBAR_TYPE { SBT_HSCROLL, SBT_VSCROLL };
+
+enum PWL_SBBUTTON_TYPE { PSBT_MIN, PSBT_MAX, PSBT_POS };
+
+class CPWL_SBButton : public CPWL_Wnd {
+ public:
+  CPWL_SBButton(PWL_SCROLLBAR_TYPE eScrollBarType,
+                PWL_SBBUTTON_TYPE eButtonType);
+  ~CPWL_SBButton() override;
+
+  // CPWL_Wnd
+  CFX_ByteString GetClassName() const override;
+  void OnCreate(PWL_CREATEPARAM& cp) override;
+  void DrawThisAppearance(CFX_RenderDevice* pDevice,
+                          CFX_Matrix* pUser2Device) override;
+  bool OnLButtonDown(const CFX_PointF& point, uint32_t nFlag) override;
+  bool OnLButtonUp(const CFX_PointF& point, uint32_t nFlag) override;
+  bool OnMouseMove(const CFX_PointF& point, uint32_t nFlag) override;
+
+ protected:
+  PWL_SCROLLBAR_TYPE m_eScrollBarType;
+  PWL_SBBUTTON_TYPE m_eSBButtonType;
+
+  bool m_bMouseDown;
+};
+
+struct PWL_FLOATRANGE {
+ public:
+  PWL_FLOATRANGE();
+  PWL_FLOATRANGE(float min, float max);
+
+  bool operator==(const PWL_FLOATRANGE& that) const {
+    return fMin == that.fMin && fMax == that.fMax;
+  }
+  bool operator!=(const PWL_FLOATRANGE& that) const { return !(*this == that); }
+
+  void Default();
+  void Set(float min, float max);
+  bool In(float x) const;
+  float GetWidth() const;
+
+  float fMin;
+  float fMax;
+};
+
+struct PWL_SCROLL_PRIVATEDATA {
+ public:
+  PWL_SCROLL_PRIVATEDATA();
+
+  bool operator==(const PWL_SCROLL_PRIVATEDATA& that) const {
+    return ScrollRange == that.ScrollRange &&
+           fClientWidth == that.fClientWidth && fScrollPos == that.fScrollPos &&
+           fBigStep == that.fBigStep && fSmallStep == that.fSmallStep;
+  }
+  bool operator!=(const PWL_SCROLL_PRIVATEDATA& that) const {
+    return !(*this == that);
+  }
+
+  void Default();
+  void SetScrollRange(float min, float max);
+  void SetClientWidth(float width);
+  void SetSmallStep(float step);
+  void SetBigStep(float step);
+  bool SetPos(float pos);
+
+  void AddSmall();
+  void SubSmall();
+  void AddBig();
+  void SubBig();
+
+  PWL_FLOATRANGE ScrollRange;
+  float fClientWidth;
+  float fScrollPos;
+  float fBigStep;
+  float fSmallStep;
+};
+
+class CPWL_ScrollBar : public CPWL_Wnd {
+ public:
+  explicit CPWL_ScrollBar(PWL_SCROLLBAR_TYPE sbType = SBT_HSCROLL);
+  ~CPWL_ScrollBar() override;
+
+  // CPWL_Wnd
+  CFX_ByteString GetClassName() const override;
+  void OnCreate(PWL_CREATEPARAM& cp) override;
+  void OnDestroy() override;
+  void RePosChildWnd() override;
+  void DrawThisAppearance(CFX_RenderDevice* pDevice,
+                          CFX_Matrix* pUser2Device) override;
+  bool OnLButtonDown(const CFX_PointF& point, uint32_t nFlag) override;
+  bool OnLButtonUp(const CFX_PointF& point, uint32_t nFlag) override;
+  void SetScrollInfo(const PWL_SCROLL_INFO& info) override;
+  void SetScrollPosition(float pos) override;
+  void NotifyLButtonDown(CPWL_Wnd* child, const CFX_PointF& pos) override;
+  void NotifyLButtonUp(CPWL_Wnd* child, const CFX_PointF& pos) override;
+  void NotifyMouseMove(CPWL_Wnd* child, const CFX_PointF& pos) override;
+  void CreateChildWnd(const PWL_CREATEPARAM& cp) override;
+  void TimerProc() override;
+
+  float GetScrollBarWidth() const;
+  PWL_SCROLLBAR_TYPE GetScrollBarType() const { return m_sbType; }
+
+  void SetNotifyForever(bool bForever) { m_bNotifyForever = bForever; }
+
+ protected:
+  void SetScrollRange(float fMin, float fMax, float fClientWidth);
+  void SetScrollPos(float fPos);
+  void MovePosButton(bool bRefresh);
+  void SetScrollStep(float fBigStep, float fSmallStep);
+  void NotifyScrollWindow();
+  CFX_FloatRect GetScrollArea() const;
+
+ private:
+  void CreateButtons(const PWL_CREATEPARAM& cp);
+
+  void OnMinButtonLBDown(const CFX_PointF& point);
+  void OnMinButtonLBUp(const CFX_PointF& point);
+  void OnMinButtonMouseMove(const CFX_PointF& point);
+
+  void OnMaxButtonLBDown(const CFX_PointF& point);
+  void OnMaxButtonLBUp(const CFX_PointF& point);
+  void OnMaxButtonMouseMove(const CFX_PointF& point);
+
+  void OnPosButtonLBDown(const CFX_PointF& point);
+  void OnPosButtonLBUp(const CFX_PointF& point);
+  void OnPosButtonMouseMove(const CFX_PointF& point);
+
+  float TrueToFace(float);
+  float FaceToTrue(float);
+
+  PWL_SCROLLBAR_TYPE m_sbType;
+  PWL_SCROLL_INFO m_OriginInfo;
+  CFX_UnownedPtr<CPWL_SBButton> m_pMinButton;
+  CFX_UnownedPtr<CPWL_SBButton> m_pMaxButton;
+  CFX_UnownedPtr<CPWL_SBButton> m_pPosButton;
+  PWL_SCROLL_PRIVATEDATA m_sData;
+  bool m_bMouseDown;
+  bool m_bMinOrMax;
+  bool m_bNotifyForever;
+  float m_nOldPos;
+  float m_fOldPosButton;
+};
+
+#endif  // FPDFSDK_PWL_CPWL_SCROLL_BAR_H_