diff --git a/fpdfsdk/formfiller/cffl_combobox.cpp b/fpdfsdk/formfiller/cffl_combobox.cpp
index 262c485..4b84733 100644
--- a/fpdfsdk/formfiller/cffl_combobox.cpp
+++ b/fpdfsdk/formfiller/cffl_combobox.cpp
@@ -267,19 +267,9 @@
     unsigned short* pBuffer = (unsigned short*)bsUTFText.c_str();
     m_pApp->FFI_OnSetFieldInputFocus(m_pWidget->GetFormField(), pBuffer,
                                      nCharacters, TRUE);
-
-    pEdit->SetEditNotify(this);
   }
 }
 
-void CFFL_ComboBox::OnKillFocus(CPWL_Wnd* pWnd) {
-  ASSERT(m_pApp);
-}
-
-void CFFL_ComboBox::OnAddUndo(CPWL_Edit* pEdit) {
-  ASSERT(pEdit);
-}
-
 CFX_WideString CFFL_ComboBox::GetSelectExportText() {
   CFX_WideString swRet;
 
diff --git a/fpdfsdk/formfiller/cffl_combobox.h b/fpdfsdk/formfiller/cffl_combobox.h
index 947f425..6b8fb49 100644
--- a/fpdfsdk/formfiller/cffl_combobox.h
+++ b/fpdfsdk/formfiller/cffl_combobox.h
@@ -19,9 +19,7 @@
   CFX_WideString sValue;
 };
 
-class CFFL_ComboBox : public CFFL_FormFiller,
-                      public IPWL_FocusHandler,
-                      public IPWL_Edit_Notify {
+class CFFL_ComboBox : public CFFL_FormFiller, public IPWL_FocusHandler {
  public:
   CFFL_ComboBox(CPDFDoc_Environment* pApp, CPDFSDK_Annot* pWidget);
   ~CFFL_ComboBox() override;
@@ -49,10 +47,6 @@
 
   // IPWL_FocusHandler:
   void OnSetFocus(CPWL_Wnd* pWnd) override;
-  void OnKillFocus(CPWL_Wnd* pWnd) override;
-
-  // IPWL_Edit_Notify:
-  void OnAddUndo(CPWL_Edit* pEdit) override;
 
 #ifdef PDF_ENABLE_XFA
   // CFFL_FormFiller:
diff --git a/fpdfsdk/formfiller/cffl_textfield.cpp b/fpdfsdk/formfiller/cffl_textfield.cpp
index 4f32f42..5e69031 100644
--- a/fpdfsdk/formfiller/cffl_textfield.cpp
+++ b/fpdfsdk/formfiller/cffl_textfield.cpp
@@ -279,11 +279,5 @@
     unsigned short* pBuffer = (unsigned short*)bsUTFText.c_str();
     m_pApp->FFI_OnSetFieldInputFocus(m_pWidget->GetFormField(), pBuffer,
                                      nCharacters, TRUE);
-
-    pEdit->SetEditNotify(this);
   }
 }
-
-void CFFL_TextField::OnKillFocus(CPWL_Wnd* pWnd) {}
-
-void CFFL_TextField::OnAddUndo(CPWL_Edit* pEdit) {}
diff --git a/fpdfsdk/formfiller/cffl_textfield.h b/fpdfsdk/formfiller/cffl_textfield.h
index d7bfc9e..34968e8 100644
--- a/fpdfsdk/formfiller/cffl_textfield.h
+++ b/fpdfsdk/formfiller/cffl_textfield.h
@@ -21,9 +21,7 @@
   CFX_WideString sValue;
 };
 
-class CFFL_TextField : public CFFL_FormFiller,
-                       public IPWL_FocusHandler,
-                       public IPWL_Edit_Notify {
+class CFFL_TextField : public CFFL_FormFiller, public IPWL_FocusHandler {
  public:
   CFFL_TextField(CPDFDoc_Environment* pApp, CPDFSDK_Annot* pAnnot);
   ~CFFL_TextField() override;
@@ -51,10 +49,6 @@
 
   // IPWL_FocusHandler:
   void OnSetFocus(CPWL_Wnd* pWnd) override;
-  void OnKillFocus(CPWL_Wnd* pWnd) override;
-
-  // IPWL_Edit_Notify:
-  void OnAddUndo(CPWL_Edit* pEdit) override;
 
 #ifdef PDF_ENABLE_XFA
   // CFFL_FormFiller:
diff --git a/fpdfsdk/fxedit/fxet_edit.cpp b/fpdfsdk/fxedit/fxet_edit.cpp
index 2125eb8..fb219ca 100644
--- a/fpdfsdk/fxedit/fxet_edit.cpp
+++ b/fpdfsdk/fxedit/fxet_edit.cpp
@@ -3094,8 +3094,6 @@
 void CFX_Edit::EndGroupUndo() {
   m_pGroupUndoItem->UpdateItems();
   m_Undo.AddItem(m_pGroupUndoItem);
-  if (m_bOprNotify && m_pOprNotify)
-    m_pOprNotify->OnAddUndo(m_pGroupUndoItem);
   m_pGroupUndoItem = nullptr;
 }
 
@@ -3104,15 +3102,11 @@
     m_pGroupUndoItem->AddUndoItem(pEditUndoItem);
   } else {
     m_Undo.AddItem(pEditUndoItem);
-    if (m_bOprNotify && m_pOprNotify)
-      m_pOprNotify->OnAddUndo(pEditUndoItem);
   }
 }
 
 void CFX_Edit::AddUndoItem(IFX_Edit_UndoItem* pUndoItem) {
   m_Undo.AddItem(pUndoItem);
-  if (m_bOprNotify && m_pOprNotify)
-    m_pOprNotify->OnAddUndo(pUndoItem);
 }
 
 CFX_Edit_LineRectArray::CFX_Edit_LineRectArray() {}
diff --git a/fpdfsdk/fxedit/include/fxet_edit.h b/fpdfsdk/fxedit/include/fxet_edit.h
index 3bf5849..4287705 100644
--- a/fpdfsdk/fxedit/include/fxet_edit.h
+++ b/fpdfsdk/fxedit/include/fxet_edit.h
@@ -566,7 +566,6 @@
   friend class CFXEU_Backspace;
   friend class CFXEU_Delete;
   friend class CFXEU_Clear;
-  friend class CFXEU_ClearRich;
   friend class CFXEU_InsertText;
 
   void SetSel(const CPVT_WordPlace& begin, const CPVT_WordPlace& end);
diff --git a/fpdfsdk/pdfwindow/PWL_Edit.cpp b/fpdfsdk/pdfwindow/PWL_Edit.cpp
index d729945..39ea822 100644
--- a/fpdfsdk/pdfwindow/PWL_Edit.cpp
+++ b/fpdfsdk/pdfwindow/PWL_Edit.cpp
@@ -104,11 +104,6 @@
   return rcClient;
 }
 
-void CPWL_Edit::SetAlignFormatH(PWL_EDIT_ALIGNFORMAT_H nFormat,
-                                FX_BOOL bPaint) {
-  m_pEdit->SetAlignmentH((int32_t)nFormat, bPaint);
-}
-
 void CPWL_Edit::SetAlignFormatV(PWL_EDIT_ALIGNFORMAT_V nFormat,
                                 FX_BOOL bPaint) {
   m_pEdit->SetAlignmentV((int32_t)nFormat, bPaint);
@@ -464,14 +459,7 @@
 
   m_pEdit->SelectNone();
   SetCaret(FALSE, CFX_FloatPoint(0.0f, 0.0f), CFX_FloatPoint(0.0f, 0.0f));
-
   SetCharSet(FXFONT_ANSI_CHARSET);
-
-  if (!IsReadOnly()) {
-    if (IPWL_FocusHandler* pFocusHandler = GetFocusHandler())
-      pFocusHandler->OnKillFocus(this);
-  }
-
   m_bFocus = FALSE;
 }
 
@@ -770,10 +758,6 @@
     m_pEdit->RefreshWordRange(CombineWordRange(GetLatinWordsRange(oldplace),
                                                GetLatinWordsRange(place)));
   }
-
-  if (m_pEditNotify) {
-    m_pEditNotify->OnInsertReturn(place, oldplace);
-  }
 }
 
 void CPWL_Edit::OnBackSpace(const CPVT_WordPlace& place,
@@ -782,10 +766,6 @@
     m_pEdit->RefreshWordRange(CombineWordRange(GetLatinWordsRange(oldplace),
                                                GetLatinWordsRange(place)));
   }
-
-  if (m_pEditNotify) {
-    m_pEditNotify->OnBackSpace(place, oldplace);
-  }
 }
 
 void CPWL_Edit::OnDelete(const CPVT_WordPlace& place,
@@ -794,10 +774,6 @@
     m_pEdit->RefreshWordRange(CombineWordRange(GetLatinWordsRange(oldplace),
                                                GetLatinWordsRange(place)));
   }
-
-  if (m_pEditNotify) {
-    m_pEditNotify->OnDelete(place, oldplace);
-  }
 }
 
 void CPWL_Edit::OnClear(const CPVT_WordPlace& place,
@@ -806,10 +782,6 @@
     m_pEdit->RefreshWordRange(CombineWordRange(GetLatinWordsRange(oldplace),
                                                GetLatinWordsRange(place)));
   }
-
-  if (m_pEditNotify) {
-    m_pEditNotify->OnClear(place, oldplace);
-  }
 }
 
 void CPWL_Edit::OnInsertWord(const CPVT_WordPlace& place,
@@ -818,10 +790,6 @@
     m_pEdit->RefreshWordRange(CombineWordRange(GetLatinWordsRange(oldplace),
                                                GetLatinWordsRange(place)));
   }
-
-  if (m_pEditNotify) {
-    m_pEditNotify->OnInsertWord(place, oldplace);
-  }
 }
 
 void CPWL_Edit::OnInsertText(const CPVT_WordPlace& place,
@@ -830,16 +798,6 @@
     m_pEdit->RefreshWordRange(CombineWordRange(GetLatinWordsRange(oldplace),
                                                GetLatinWordsRange(place)));
   }
-
-  if (m_pEditNotify) {
-    m_pEditNotify->OnInsertText(place, oldplace);
-  }
-}
-
-void CPWL_Edit::OnAddUndo(IFX_Edit_UndoItem* pUndoItem) {
-  if (m_pEditNotify) {
-    m_pEditNotify->OnAddUndo(this);
-  }
 }
 
 CPVT_WordRange CPWL_Edit::CombineWordRange(const CPVT_WordRange& wr1,
diff --git a/fpdfsdk/pdfwindow/PWL_Edit.h b/fpdfsdk/pdfwindow/PWL_Edit.h
index e1518ef..008e1fd 100644
--- a/fpdfsdk/pdfwindow/PWL_Edit.h
+++ b/fpdfsdk/pdfwindow/PWL_Edit.h
@@ -70,8 +70,6 @@
   void OnSetFocus() override;
   void OnKillFocus() override;
 
-  void SetAlignFormatH(PWL_EDIT_ALIGNFORMAT_H nFormat = PEAH_LEFT,
-                       FX_BOOL bPaint = TRUE);  // 0:left 1:right 2:middle
   void SetAlignFormatV(PWL_EDIT_ALIGNFORMAT_V nFormat = PEAV_TOP,
                        FX_BOOL bPaint = TRUE);  // 0:top 1:bottom 2:center
 
@@ -126,7 +124,6 @@
   void OnClear(const CPVT_WordPlace& place, const CPVT_WordPlace& oldplace);
   void OnInsertText(const CPVT_WordPlace& place,
                     const CPVT_WordPlace& oldplace);
-  void OnAddUndo(IFX_Edit_UndoItem* pUndoItem);
 
  private:
   CPVT_WordRange GetSelectWordRange() const;
diff --git a/fpdfsdk/pdfwindow/PWL_EditCtrl.cpp b/fpdfsdk/pdfwindow/PWL_EditCtrl.cpp
index dd1094a..1bb17db 100644
--- a/fpdfsdk/pdfwindow/PWL_EditCtrl.cpp
+++ b/fpdfsdk/pdfwindow/PWL_EditCtrl.cpp
@@ -25,12 +25,10 @@
     : m_pEdit(new CFX_Edit),
       m_pEditCaret(nullptr),
       m_bMouseDown(FALSE),
-      m_pEditNotify(nullptr),
       m_nCharSet(DEFAULT_CHARSET),
       m_nCodePage(0) {}
 
-CPWL_EditCtrl::~CPWL_EditCtrl() {
-}
+CPWL_EditCtrl::~CPWL_EditCtrl() {}
 
 void CPWL_EditCtrl::OnCreate(PWL_CREATEPARAM& cp) {
   cp.eCursorType = FXCT_VBEAM;
@@ -566,13 +564,10 @@
   OnNotify(this, PNM_SETCARETINFO, (intptr_t)&cInfo, (intptr_t) nullptr);
 }
 
-void CPWL_EditCtrl::IOnContentChange(const CFX_FloatRect& rcContent) {
-  if (IsValid()) {
-    if (m_pEditNotify) {
-      m_pEditNotify->OnContentChange(rcContent);
-    }
-  }
-}
+void CPWL_EditCtrl::IOnCaretChange(const CPVT_SecProps& secProps,
+                                   const CPVT_WordProps& wordProps) {}
+
+void CPWL_EditCtrl::IOnContentChange(const CFX_FloatRect& rcContent) {}
 
 void CPWL_EditCtrl::IOnInvalidateRect(CFX_FloatRect* pRect) {
   InvalidateRect(pRect);
diff --git a/fpdfsdk/pdfwindow/PWL_EditCtrl.h b/fpdfsdk/pdfwindow/PWL_EditCtrl.h
index 028c41b..f767d1b 100644
--- a/fpdfsdk/pdfwindow/PWL_EditCtrl.h
+++ b/fpdfsdk/pdfwindow/PWL_EditCtrl.h
@@ -15,7 +15,6 @@
 class CPWL_Caret;
 class CPWL_Edit;
 class CPWL_EditCtrl;
-class IPWL_Edit_Notify;
 struct CPVT_SecProps;
 struct CPVT_WordPlace;
 struct CPVT_WordProps;
@@ -25,36 +24,6 @@
 
 enum PWL_EDIT_ALIGNFORMAT_V { PEAV_TOP = 0, PEAV_CENTER, PEAV_BOTTOM };
 
-class IPWL_Edit_Notify {
- public:
-  virtual ~IPWL_Edit_Notify() {}
-  // when the position of caret is changed in edit
-  virtual void OnCaretMove(int32_t x1, int32_t y1, int32_t x2, int32_t y2) {}
-  virtual void OnContentChange(const CFX_FloatRect& rcContent) {}
-  // OprType: 0 InsertWord
-  // 1 InsertReturn
-  // 2 BackSpace
-  // 3 Delete
-  // 4 Clear
-  // 5 InsertText
-  // 6 SetText
-  virtual void OnInsertWord(const CPVT_WordPlace& place,
-                            const CPVT_WordPlace& oldplace) {}
-  virtual void OnInsertReturn(const CPVT_WordPlace& place,
-                              const CPVT_WordPlace& oldplace) {}
-  virtual void OnBackSpace(const CPVT_WordPlace& place,
-                           const CPVT_WordPlace& oldplace) {}
-  virtual void OnDelete(const CPVT_WordPlace& place,
-                        const CPVT_WordPlace& oldplace) {}
-  virtual void OnClear(const CPVT_WordPlace& place,
-                       const CPVT_WordPlace& oldplace) {}
-  virtual void OnInsertText(const CPVT_WordPlace& place,
-                            const CPVT_WordPlace& oldplace) {}
-  virtual void OnSetText(const CPVT_WordPlace& place,
-                         const CPVT_WordPlace& oldplace) {}
-  virtual void OnAddUndo(CPWL_Edit* pEdit) {}
-};
-
 class CPWL_EditCtrl : public CPWL_Wnd {
   friend class CPWL_Edit_Notify;
 
@@ -85,8 +54,6 @@
   CFX_FloatPoint GetScrollPos() const;
   void SetScrollPos(const CFX_FloatPoint& point);
 
-  void SetEditNotify(IPWL_Edit_Notify* pNotify) { m_pEditNotify = pNotify; }
-
   void SetCharSet(uint8_t nCharSet) { m_nCharSet = nCharSet; }
   int32_t GetCharSet() const;
 
@@ -162,7 +129,6 @@
   std::unique_ptr<CFX_Edit> m_pEdit;
   CPWL_Caret* m_pEditCaret;
   FX_BOOL m_bMouseDown;
-  IPWL_Edit_Notify* m_pEditNotify;
 
  private:
   void CreateEditCaret(const PWL_CREATEPARAM& cp);
diff --git a/fpdfsdk/pdfwindow/PWL_Wnd.h b/fpdfsdk/pdfwindow/PWL_Wnd.h
index 197bdf0..2e780c6 100644
--- a/fpdfsdk/pdfwindow/PWL_Wnd.h
+++ b/fpdfsdk/pdfwindow/PWL_Wnd.h
@@ -182,7 +182,6 @@
  public:
   virtual ~IPWL_FocusHandler() {}
   virtual void OnSetFocus(CPWL_Wnd* pWnd) = 0;
-  virtual void OnKillFocus(CPWL_Wnd* pWnd) = 0;
 };
 
 struct PWL_CREATEPARAM {