Merge IFWL and CFWL classes.

xfa/fwl/core/cfwl_edit.cpp

Index: xfa/fwl/core/cfwl_edit.cpp
diff --git a/xfa/fwl/core/cfwl_edit.cpp b/xfa/fwl/core/cfwl_edit.cpp
index e404b1de6a811f2867703f346c300537c891e5cb..99cac68d57d4fa11fca9b7a8371d30aeb882cb6f 100644
--- a/xfa/fwl/core/cfwl_edit.cpp
+++ b/xfa/fwl/core/cfwl_edit.cpp
@@ -6,67 +6,1656 @@
 
 #include "xfa/fwl/core/cfwl_edit.h"
 
+#include <algorithm>
 #include <memory>
+#include <utility>
 #include <vector>
 
 #include "third_party/base/ptr_util.h"
+#include "third_party/base/stl_util.h"
+#include "xfa/fde/cfde_txtedtengine.h"
+#include "xfa/fde/fde_gedevice.h"
+#include "xfa/fde/fde_render.h"
+#include "xfa/fde/ifde_txtedtpage.h"
+#include "xfa/fgas/font/cfgas_gefont.h"
+#include "xfa/fwl/core/cfwl_app.h"
+#include "xfa/fwl/core/cfwl_caret.h"
+#include "xfa/fwl/core/cfwl_evtcheckword.h"
+#include "xfa/fwl/core/cfwl_evttextchanged.h"
+#include "xfa/fwl/core/cfwl_evttextfull.h"
+#include "xfa/fwl/core/cfwl_evtvalidate.h"
+#include "xfa/fwl/core/cfwl_msgkey.h"
+#include "xfa/fwl/core/cfwl_msgmouse.h"
+#include "xfa/fwl/core/cfwl_themebackground.h"
+#include "xfa/fwl/core/cfwl_themepart.h"
+#include "xfa/fwl/core/cfwl_widgetmgr.h"
+#include "xfa/fwl/core/ifwl_themeprovider.h"
+#include "xfa/fxfa/xfa_ffdoc.h"
+#include "xfa/fxfa/xfa_ffwidget.h"
+#include "xfa/fxgraphics/cfx_path.h"
 
 namespace {
 
-IFWL_Edit* ToEdit(IFWL_Widget* widget) {
-  return static_cast<IFWL_Edit*>(widget);
+const int kEditMargin = 3;
+
+bool FX_EDIT_ISLATINWORD(FX_WCHAR c) {
+  return c == 0x2D || (c <= 0x005A && c >= 0x0041) ||
+         (c <= 0x007A && c >= 0x0061) || (c <= 0x02AF && c >= 0x00C0) ||
+         c == 0x0027;
+}
+
+void AddSquigglyPath(CFX_Path* pPathData,
+                     FX_FLOAT fStartX,
+                     FX_FLOAT fEndX,
+                     FX_FLOAT fY,
+                     FX_FLOAT fStep) {
+  pPathData->MoveTo(fStartX, fY);
+  int i = 1;
+  for (FX_FLOAT fx = fStartX + fStep; fx < fEndX; fx += fStep, ++i)
+    pPathData->LineTo(fx, fY + (i & 1) * fStep);
 }
 
 }  // namespace
 
-CFWL_Edit::CFWL_Edit(const CFWL_App* app) : CFWL_Widget(app) {}
+CFWL_Edit::CFWL_Edit(const CFWL_App* app,
+                     std::unique_ptr<CFWL_WidgetProperties> properties,
+                     CFWL_Widget* pOuter)
+    : CFWL_Widget(app, std::move(properties), pOuter),
+      m_fVAlignOffset(0.0f),
+      m_fScrollOffsetX(0.0f),
+      m_fScrollOffsetY(0.0f),
+      m_bLButtonDown(false),
+      m_nSelStart(0),
+      m_nLimit(-1),
+      m_fFontSize(0),
+      m_bSetRange(false),
+      m_iMax(0xFFFFFFF),
+      m_iCurRecord(-1),
+      m_iMaxRecord(128) {
+  m_rtClient.Reset();
+  m_rtEngine.Reset();
+  m_rtStatic.Reset();
+
+  InitCaret();
+}
+
+CFWL_Edit::~CFWL_Edit() {
+  if (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused)
+    ShowCaret(false);
+  ClearRecord();
+}
+
+FWL_Type CFWL_Edit::GetClassID() const {
+  return FWL_Type::Edit;
+}
+
+void CFWL_Edit::GetWidgetRect(CFX_RectF& rect, bool bAutoSize) {
+  if (!bAutoSize) {
+    rect = m_pProperties->m_rtWidget;
+    if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_OuterScrollbar) {
+      if (IsShowScrollBar(true)) {
+        FX_FLOAT* pfWidth = static_cast<FX_FLOAT*>(
+            GetThemeCapacity(CFWL_WidgetCapacity::ScrollBarWidth));
+        rect.width += *pfWidth;
+        rect.width += kEditMargin;
+      }
+      if (IsShowScrollBar(false)) {
+        FX_FLOAT* pfWidth = static_cast<FX_FLOAT*>(
+            GetThemeCapacity(CFWL_WidgetCapacity::ScrollBarWidth));
+        rect.height += *pfWidth;
+        rect.height += kEditMargin;
+      }
+    }
+    return;
+  }
+
+  rect.Set(0, 0, 0, 0);
+
+  int32_t iTextLen = m_EdtEngine.GetTextLength();
+  if (iTextLen > 0) {
+    CFX_WideString wsText;
+    m_EdtEngine.GetText(wsText, 0);
+    CFX_SizeF sz = CalcTextSize(
+        wsText, m_pProperties->m_pThemeProvider,
+        !!(m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_MultiLine));
+    rect.Set(0, 0, sz.x, sz.y);
+  }
+  CFWL_Widget::GetWidgetRect(rect, true);
+}
+
+void CFWL_Edit::SetStates(uint32_t dwStates, bool bSet) {
+  if ((m_pProperties->m_dwStates & FWL_WGTSTATE_Invisible) ||
+      (m_pProperties->m_dwStates & FWL_WGTSTATE_Disabled)) {
+    ShowCaret(false);
+  }
+  CFWL_Widget::SetStates(dwStates, bSet);
+}
+
+void CFWL_Edit::Update() {
+  if (IsLocked())
+    return;
+  if (!m_pProperties->m_pThemeProvider)
+    m_pProperties->m_pThemeProvider = GetAvailableTheme();
+
+  Layout();
+  if (m_rtClient.IsEmpty())
+    return;
+
+  UpdateEditEngine();
+  UpdateVAlignment();
+  UpdateScroll();
+  InitCaret();
+}
+
+FWL_WidgetHit CFWL_Edit::HitTest(FX_FLOAT fx, FX_FLOAT fy) {
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_OuterScrollbar) {
+    if (IsShowScrollBar(true)) {
+      CFX_RectF rect;
+      m_pVertScrollBar->GetWidgetRect(rect);
+      if (rect.Contains(fx, fy))
+        return FWL_WidgetHit::VScrollBar;
+    }
+    if (IsShowScrollBar(false)) {
+      CFX_RectF rect;
+      m_pHorzScrollBar->GetWidgetRect(rect);
+      if (rect.Contains(fx, fy))
+        return FWL_WidgetHit::HScrollBar;
+    }
+  }
+  if (m_rtClient.Contains(fx, fy))
+    return FWL_WidgetHit::Edit;
+  return FWL_WidgetHit::Unknown;
+}
+
+void CFWL_Edit::AddSpellCheckObj(CFX_Path& PathData,
+                                 int32_t nStart,
+                                 int32_t nCount,
+                                 FX_FLOAT fOffSetX,
+                                 FX_FLOAT fOffSetY) {
+  FX_FLOAT fStartX = 0.0f;
+  FX_FLOAT fEndX = 0.0f;
+  FX_FLOAT fY = 0.0f;
+  FX_FLOAT fStep = 0.0f;
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(0);
+  CFX_RectFArray rectArray;
+  CFX_RectF rectText;
+  const FDE_TXTEDTPARAMS* txtEdtParams = m_EdtEngine.GetEditParams();
+  FX_FLOAT fAsent = static_cast<FX_FLOAT>(txtEdtParams->pFont->GetAscent()) *
+                    txtEdtParams->fFontSize / 1000;
+  pPage->CalcRangeRectArray(nStart, nCount, rectArray);
+
+  for (int i = 0; i < rectArray.GetSize(); i++) {
+    rectText = rectArray.GetAt(i);
+    fY = rectText.top + fAsent + fOffSetY;
+    fStep = txtEdtParams->fFontSize / 16.0f;
+    fStartX = rectText.left + fOffSetX;
+    fEndX = fStartX + rectText.Width();
+    AddSquigglyPath(&PathData, fStartX, fEndX, fY, fStep);
+  }
+}
+
+void CFWL_Edit::DrawSpellCheck(CFX_Graphics* pGraphics,
+                               const CFX_Matrix* pMatrix) {
+  pGraphics->SaveGraphState();
+  if (pMatrix)
+    pGraphics->ConcatMatrix(const_cast<CFX_Matrix*>(pMatrix));
+
+  CFX_Color crLine(0xFFFF0000);
+  CFWL_EvtCheckWord checkWordEvent;
+  checkWordEvent.m_pSrcTarget = this;
+
+  CFX_ByteString sLatinWord;
+  CFX_Path pathSpell;
+  pathSpell.Create();
+
+  int32_t nStart = 0;
+  FX_FLOAT fOffSetX = m_rtEngine.left - m_fScrollOffsetX;
+  FX_FLOAT fOffSetY = m_rtEngine.top - m_fScrollOffsetY + m_fVAlignOffset;
+
+  CFX_WideString wsSpell;
+  GetText(wsSpell);
+  int32_t nContentLen = wsSpell.GetLength();
+  for (int i = 0; i < nContentLen; i++) {
+    if (FX_EDIT_ISLATINWORD(wsSpell[i])) {
+      if (sLatinWord.IsEmpty())
+        nStart = i;
+      sLatinWord += (FX_CHAR)wsSpell[i];
+      continue;
+    }
+    checkWordEvent.bsWord = sLatinWord;
+    checkWordEvent.bCheckWord = true;
+    DispatchEvent(&checkWordEvent);
 
-CFWL_Edit::~CFWL_Edit() {}
+    if (!sLatinWord.IsEmpty() && !checkWordEvent.bCheckWord) {
+      AddSpellCheckObj(pathSpell, nStart, sLatinWord.GetLength(), fOffSetX,
+                       fOffSetY);
+    }
+    sLatinWord.clear();
+  }
 
-void CFWL_Edit::Initialize() {
-  ASSERT(!m_pIface);
+  checkWordEvent.bsWord = sLatinWord;
+  checkWordEvent.bCheckWord = true;
+  DispatchEvent(&checkWordEvent);
 
-  m_pIface = pdfium::MakeUnique<IFWL_Edit>(
-      m_pApp, pdfium::MakeUnique<CFWL_WidgetProperties>(), nullptr);
+  if (!sLatinWord.IsEmpty() && !checkWordEvent.bCheckWord) {
+    AddSpellCheckObj(pathSpell, nStart, sLatinWord.GetLength(), fOffSetX,
+                     fOffSetY);
+  }
+  if (!pathSpell.IsEmpty()) {
+    CFX_RectF rtClip = m_rtEngine;
+    CFX_Matrix mt;
+    mt.Set(1, 0, 0, 1, fOffSetX, fOffSetY);
+    if (pMatrix) {
+      pMatrix->TransformRect(rtClip);
+      mt.Concat(*pMatrix);
+    }
+    pGraphics->SetClipRect(rtClip);
+    pGraphics->SetStrokeColor(&crLine);
+    pGraphics->SetLineWidth(0);
+    pGraphics->StrokePath(&pathSpell, nullptr);
+  }
+  pGraphics->RestoreGraphState();
+}
+
+void CFWL_Edit::DrawWidget(CFX_Graphics* pGraphics, const CFX_Matrix* pMatrix) {
+  if (!pGraphics)
+    return;
+  if (!m_pProperties->m_pThemeProvider)
+    return;
+  if (m_rtClient.IsEmpty())
+    return;
+
+  IFWL_ThemeProvider* pTheme = m_pProperties->m_pThemeProvider;
+  if (!m_pWidgetMgr->IsFormDisabled())
+    DrawTextBk(pGraphics, pTheme, pMatrix);
+  DrawContent(pGraphics, pTheme, pMatrix);
+
+  if ((m_pProperties->m_dwStates & FWL_WGTSTATE_Focused) &&
+      !(m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_ReadOnly)) {
+    DrawSpellCheck(pGraphics, pMatrix);
+  }
+  if (HasBorder())
+    DrawBorder(pGraphics, CFWL_Part::Border, pTheme, pMatrix);
+  if (HasEdge())
+    DrawEdge(pGraphics, CFWL_Part::Edge, pTheme, pMatrix);
+}
 
-  CFWL_Widget::Initialize();
+void CFWL_Edit::SetThemeProvider(IFWL_ThemeProvider* pThemeProvider) {
+  if (!pThemeProvider)
+    return;
+  if (m_pHorzScrollBar)
+    m_pHorzScrollBar->SetThemeProvider(pThemeProvider);
+  if (m_pVertScrollBar)
+    m_pVertScrollBar->SetThemeProvider(pThemeProvider);
+  if (m_pCaret)
+    m_pCaret->SetThemeProvider(pThemeProvider);
+  m_pProperties->m_pThemeProvider = pThemeProvider;
 }
 
 void CFWL_Edit::SetText(const CFX_WideString& wsText) {
-  if (GetWidget())
-    ToEdit(GetWidget())->SetText(wsText);
+  m_EdtEngine.SetText(wsText);
+}
+
+int32_t CFWL_Edit::GetTextLength() const {
+  return m_EdtEngine.GetTextLength();
 }
 
 void CFWL_Edit::GetText(CFX_WideString& wsText,
                         int32_t nStart,
                         int32_t nCount) const {
-  if (GetWidget())
-    ToEdit(GetWidget())->GetText(wsText, nStart, nCount);
+  m_EdtEngine.GetText(wsText, nStart, nCount);
+}
+
+void CFWL_Edit::ClearText() {
+  m_EdtEngine.ClearText();
+}
+
+void CFWL_Edit::AddSelRange(int32_t nStart, int32_t nCount) {
+  m_EdtEngine.AddSelRange(nStart, nCount);
 }
 
 int32_t CFWL_Edit::CountSelRanges() const {
-  return GetWidget() ? ToEdit(GetWidget())->CountSelRanges() : 0;
+  return m_EdtEngine.CountSelRanges();
 }
 
 int32_t CFWL_Edit::GetSelRange(int32_t nIndex, int32_t& nStart) const {
-  return GetWidget() ? ToEdit(GetWidget())->GetSelRange(nIndex, nStart) : 0;
+  return m_EdtEngine.GetSelRange(nIndex, nStart);
+}
+
+void CFWL_Edit::ClearSelections() {
+  m_EdtEngine.ClearSelection();
 }
 
 int32_t CFWL_Edit::GetLimit() const {
-  return GetWidget() ? ToEdit(GetWidget())->GetLimit() : -1;
+  return m_nLimit;
 }
 
 void CFWL_Edit::SetLimit(int32_t nLimit) {
-  if (GetWidget())
-    ToEdit(GetWidget())->SetLimit(nLimit);
+  m_nLimit = nLimit;
+  m_EdtEngine.SetLimit(nLimit);
 }
 
 void CFWL_Edit::SetAliasChar(FX_WCHAR wAlias) {
-  if (GetWidget())
-    ToEdit(GetWidget())->SetAliasChar(wAlias);
+  m_EdtEngine.SetAliasChar(wAlias);
+}
+
+bool CFWL_Edit::Copy(CFX_WideString& wsCopy) {
+  int32_t nCount = m_EdtEngine.CountSelRanges();
+  if (nCount == 0)
+    return false;
+
+  wsCopy.clear();
+  CFX_WideString wsTemp;
+  int32_t nStart, nLength;
+  for (int32_t i = 0; i < nCount; i++) {
+    nLength = m_EdtEngine.GetSelRange(i, nStart);
+    m_EdtEngine.GetText(wsTemp, nStart, nLength);
+    wsCopy += wsTemp;
+    wsTemp.clear();
+  }
+  return true;
+}
+
+bool CFWL_Edit::Cut(CFX_WideString& wsCut) {
+  int32_t nCount = m_EdtEngine.CountSelRanges();
+  if (nCount == 0)
+    return false;
+
+  wsCut.clear();
+  CFX_WideString wsTemp;
+  int32_t nStart, nLength;
+  for (int32_t i = 0; i < nCount; i++) {
+    nLength = m_EdtEngine.GetSelRange(i, nStart);
+    m_EdtEngine.GetText(wsTemp, nStart, nLength);
+    wsCut += wsTemp;
+    wsTemp.clear();
+  }
+  m_EdtEngine.Delete(0);
+  return true;
+}
+
+bool CFWL_Edit::Paste(const CFX_WideString& wsPaste) {
+  int32_t nCaret = m_EdtEngine.GetCaretPos();
+  int32_t iError =
+      m_EdtEngine.Insert(nCaret, wsPaste.c_str(), wsPaste.GetLength());
+  if (iError < 0) {
+    ProcessInsertError(iError);
+    return false;
+  }
+  return true;
+}
+
+bool CFWL_Edit::Redo(const IFDE_TxtEdtDoRecord* pRecord) {
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_NoRedoUndo)
+    return true;
+  return m_EdtEngine.Redo(pRecord);
+}
+
+bool CFWL_Edit::Undo(const IFDE_TxtEdtDoRecord* pRecord) {
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_NoRedoUndo)
+    return true;
+  return m_EdtEngine.Undo(pRecord);
+}
+
+bool CFWL_Edit::Undo() {
+  if (!CanUndo())
+    return false;
+  return Undo(m_DoRecords[m_iCurRecord--].get());
+}
+
+bool CFWL_Edit::Redo() {
+  if (!CanRedo())
+    return false;
+  return Redo(m_DoRecords[++m_iCurRecord].get());
+}
+
+bool CFWL_Edit::CanUndo() {
+  return m_iCurRecord >= 0;
+}
+
+bool CFWL_Edit::CanRedo() {
+  return m_iCurRecord < pdfium::CollectionSize<int32_t>(m_DoRecords) - 1;
+}
+
+void CFWL_Edit::SetOuter(CFWL_Widget* pOuter) {
+  m_pOuter = pOuter;
+}
+
+void CFWL_Edit::On_CaretChanged(CFDE_TxtEdtEngine* pEdit,
+                                int32_t nPage,
+                                bool bVisible) {
+  if (m_rtEngine.IsEmpty())
+    return;
+  if ((m_pProperties->m_dwStates & FWL_WGTSTATE_Focused) == 0)
+    return;
+
+  bool bRepaintContent = UpdateOffset();
+  UpdateCaret();
+  CFX_RectF rtInvalid;
+  rtInvalid.Set(0, 0, 0, 0);
+  bool bRepaintScroll = false;
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_MultiLine) {
+    CFWL_ScrollBar* pScroll = UpdateScroll();
+    if (pScroll) {
+      pScroll->GetWidgetRect(rtInvalid);
+      bRepaintScroll = true;
+    }
+  }
+  if (bRepaintContent || bRepaintScroll) {
+    if (bRepaintContent)
+      rtInvalid.Union(m_rtEngine);
+    Repaint(&rtInvalid);
+  }
+}
+
+void CFWL_Edit::On_TextChanged(CFDE_TxtEdtEngine* pEdit,
+                               FDE_TXTEDT_TEXTCHANGE_INFO& ChangeInfo) {
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_VAlignMask)
+    UpdateVAlignment();
+
+  CFX_RectF rtTemp;
+  GetClientRect(rtTemp);
+
+  CFWL_EvtTextChanged event;
+  event.m_pSrcTarget = this;
+  event.nChangeType = ChangeInfo.nChangeType;
+  event.wsInsert = ChangeInfo.wsInsert;
+  event.wsDelete = ChangeInfo.wsDelete;
+  event.wsPrevText = ChangeInfo.wsPrevText;
+  DispatchEvent(&event);
+
+  LayoutScrollBar();
+  Repaint(&rtTemp);
+}
+
+void CFWL_Edit::On_SelChanged(CFDE_TxtEdtEngine* pEdit) {
+  CFX_RectF rtTemp;
+  GetClientRect(rtTemp);
+  Repaint(&rtTemp);
+}
+
+bool CFWL_Edit::On_PageLoad(CFDE_TxtEdtEngine* pEdit,
+                            int32_t nPageIndex,
+                            int32_t nPurpose) {
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(nPageIndex);
+  if (!pPage)
+    return false;
+
+  pPage->LoadPage(nullptr, nullptr);
+  return true;
+}
+
+bool CFWL_Edit::On_PageUnload(CFDE_TxtEdtEngine* pEdit,
+                              int32_t nPageIndex,
+                              int32_t nPurpose) {
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(nPageIndex);
+  if (!pPage)
+    return false;
+
+  pPage->UnloadPage(nullptr);
+  return true;
+}
+
+void CFWL_Edit::On_AddDoRecord(CFDE_TxtEdtEngine* pEdit,
+                               IFDE_TxtEdtDoRecord* pRecord) {
+  AddDoRecord(pRecord);
+}
+
+bool CFWL_Edit::On_Validate(CFDE_TxtEdtEngine* pEdit, CFX_WideString& wsText) {
+  CFWL_Widget* pDst = GetOuter();
+  if (!pDst)
+    pDst = this;
+
+  CFWL_EvtValidate event;
+  event.pDstWidget = pDst;
+  event.m_pSrcTarget = this;
+  event.wsInsert = wsText;
+  event.bValidate = true;
+  DispatchEvent(&event);
+  return event.bValidate;
 }
 
 void CFWL_Edit::SetScrollOffset(FX_FLOAT fScrollOffset) {
-  if (GetWidget())
-    ToEdit(GetWidget())->SetScrollOffset(fScrollOffset);
+  m_fScrollOffsetY = fScrollOffset;
+}
+
+void CFWL_Edit::DrawTextBk(CFX_Graphics* pGraphics,
+                           IFWL_ThemeProvider* pTheme,
+                           const CFX_Matrix* pMatrix) {
+  CFWL_ThemeBackground param;
+  param.m_pWidget = this;
+  param.m_iPart = CFWL_Part::Background;
+  param.m_bStaticBackground = false;
+  param.m_dwStates = m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_ReadOnly
+                         ? CFWL_PartState_ReadOnly
+                         : CFWL_PartState_Normal;
+  uint32_t dwStates = (m_pProperties->m_dwStates & FWL_WGTSTATE_Disabled);
+  if (dwStates)
+    param.m_dwStates = CFWL_PartState_Disabled;
+  param.m_pGraphics = pGraphics;
+  param.m_matrix = *pMatrix;
+  param.m_rtPart = m_rtClient;
+  pTheme->DrawBackground(&param);
+
+  if (!IsShowScrollBar(true) || !IsShowScrollBar(false))
+    return;
+
+  CFX_RectF rtScorll;
+  m_pHorzScrollBar->GetWidgetRect(rtScorll);
+
+  CFX_RectF rtStatic;
+  rtStatic.Set(m_rtClient.right() - rtScorll.height,
+               m_rtClient.bottom() - rtScorll.height, rtScorll.height,
+               rtScorll.height);
+  param.m_bStaticBackground = true;
+  param.m_bMaximize = true;
+  param.m_rtPart = rtStatic;
+  pTheme->DrawBackground(&param);
+}
+
+void CFWL_Edit::DrawContent(CFX_Graphics* pGraphics,
+                            IFWL_ThemeProvider* pTheme,
+                            const CFX_Matrix* pMatrix) {
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(0);
+  if (!pPage)
+    return;
+
+  pGraphics->SaveGraphState();
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_CombText)
+    pGraphics->SaveGraphState();
+
+  CFX_RectF rtClip = m_rtEngine;
+  FX_FLOAT fOffSetX = m_rtEngine.left - m_fScrollOffsetX;
+  FX_FLOAT fOffSetY = m_rtEngine.top - m_fScrollOffsetY + m_fVAlignOffset;
+  CFX_Matrix mt;
+  mt.Set(1, 0, 0, 1, fOffSetX, fOffSetY);
+  if (pMatrix) {
+    pMatrix->TransformRect(rtClip);
+    mt.Concat(*pMatrix);
+  }
+
+  bool bShowSel = (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_NoHideSel) ||
+                  (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused);
+  if (bShowSel) {
+    CFWL_Widget* pForm = m_pWidgetMgr->GetSystemFormWidget(this);
+    if (pForm) {
+      bShowSel = (pForm->GetStates() & FWL_WGTSTATE_Deactivated) !=
+                 FWL_WGTSTATE_Deactivated;
+    }
+  }
+
+  int32_t nSelCount = m_EdtEngine.CountSelRanges();
+  if (bShowSel && nSelCount > 0) {
+    int32_t nPageCharStart = pPage->GetCharStart();
+    int32_t nPageCharCount = pPage->GetCharCount();
+    int32_t nPageCharEnd = nPageCharStart + nPageCharCount - 1;
+    int32_t nCharCount;
+    int32_t nCharStart;
+    CFX_RectFArray rectArr;
+    int32_t i = 0;
+    for (i = 0; i < nSelCount; i++) {
+      nCharCount = m_EdtEngine.GetSelRange(i, nCharStart);
+      int32_t nCharEnd = nCharStart + nCharCount - 1;
+      if (nCharEnd < nPageCharStart || nCharStart > nPageCharEnd)
+        continue;
+
+      int32_t nBgn = std::max(nCharStart, nPageCharStart);
+      int32_t nEnd = std::min(nCharEnd, nPageCharEnd);
+      pPage->CalcRangeRectArray(nBgn - nPageCharStart, nEnd - nBgn + 1,
+                                rectArr);
+    }
+
+    int32_t nCount = rectArr.GetSize();
+    CFX_Path path;
+    path.Create();
+    for (i = 0; i < nCount; i++) {
+      rectArr[i].left += fOffSetX;
+      rectArr[i].top += fOffSetY;
+      path.AddRectangle(rectArr[i].left, rectArr[i].top, rectArr[i].width,
+                        rectArr[i].height);
+    }
+    pGraphics->SetClipRect(rtClip);
+
+    CFWL_ThemeBackground param;
+    param.m_pGraphics = pGraphics;
+    param.m_matrix = *pMatrix;
+    param.m_pWidget = this;
+    param.m_iPart = CFWL_Part::Background;
+    param.m_pPath = &path;
+    pTheme->DrawBackground(&param);
+  }
+
+  CFX_RenderDevice* pRenderDev = pGraphics->GetRenderDevice();
+  if (!pRenderDev)
+    return;
+
+  std::unique_ptr<CFDE_RenderDevice> pRenderDevice(
+      new CFDE_RenderDevice(pRenderDev, false));
+  std::unique_ptr<CFDE_RenderContext> pRenderContext(new CFDE_RenderContext);
+  pRenderDevice->SetClipRect(rtClip);
+  pRenderContext->StartRender(pRenderDevice.get(), pPage, mt);
+  pRenderContext->DoRender(nullptr);
+
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_CombText) {
+    pGraphics->RestoreGraphState();
+    CFX_Path path;
+    path.Create();
+    int32_t iLimit = m_nLimit > 0 ? m_nLimit : 1;
+    FX_FLOAT fStep = m_rtEngine.width / iLimit;
+    FX_FLOAT fLeft = m_rtEngine.left + 1;
+    for (int32_t i = 1; i < iLimit; i++) {
+      fLeft += fStep;
+      path.AddLine(fLeft, m_rtClient.top, fLeft, m_rtClient.bottom());
+    }
+
+    CFWL_ThemeBackground param;
+    param.m_pGraphics = pGraphics;
+    param.m_matrix = *pMatrix;
+    param.m_pWidget = this;
+    param.m_iPart = CFWL_Part::CombTextLine;
+    param.m_pPath = &path;
+    pTheme->DrawBackground(&param);
+  }
+  pGraphics->RestoreGraphState();
+}
+
+void CFWL_Edit::UpdateEditEngine() {
+  UpdateEditParams();
+  UpdateEditLayout();
+  if (m_nLimit > -1)
+    m_EdtEngine.SetLimit(m_nLimit);
+}
+
+void CFWL_Edit::UpdateEditParams() {
+  FDE_TXTEDTPARAMS params;
+  params.nHorzScale = 100;
+  params.fPlateWidth = m_rtEngine.width;
+  params.fPlateHeight = m_rtEngine.height;
+  if (m_pProperties->m_dwStyles & FWL_WGTSTYLE_RTLLayout)
+    params.dwLayoutStyles |= FDE_TEXTEDITLAYOUT_RTL;
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_VerticalLayout)
+    params.dwLayoutStyles |= FDE_TEXTEDITLAYOUT_DocVertical;
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_VerticalChars)
+    params.dwLayoutStyles |= FDE_TEXTEDITLAYOUT_CharVertial;
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_ReverseLine)
+    params.dwLayoutStyles |= FDE_TEXTEDITLAYOUT_LineReserve;
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_ArabicShapes)
+    params.dwLayoutStyles |= FDE_TEXTEDITLAYOUT_ArabicShapes;
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_ExpandTab)
+    params.dwLayoutStyles |= FDE_TEXTEDITLAYOUT_ExpandTab;
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_CombText)
+    params.dwLayoutStyles |= FDE_TEXTEDITLAYOUT_CombText;
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_LastLineHeight)
+    params.dwLayoutStyles |= FDE_TEXTEDITLAYOUT_LastLineHeight;
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_Validate)
+    params.dwMode |= FDE_TEXTEDITMODE_Validate;
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_Password)
+    params.dwMode |= FDE_TEXTEDITMODE_Password;
+
+  switch (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_HAlignMask) {
+    case FWL_STYLEEXT_EDT_HNear: {
+      params.dwAlignment |= FDE_TEXTEDITALIGN_Left;
+      break;
+    }
+    case FWL_STYLEEXT_EDT_HCenter: {
+      params.dwAlignment |= FDE_TEXTEDITALIGN_Center;
+      break;
+    }
+    case FWL_STYLEEXT_EDT_HFar: {
+      params.dwAlignment |= FDE_TEXTEDITALIGN_Right;
+      break;
+    }
+    default:
+      break;
+  }
+  switch (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_HAlignModeMask) {
+    case FWL_STYLEEXT_EDT_Justified: {
+      params.dwAlignment |= FDE_TEXTEDITALIGN_Justified;
+      break;
+    }
+    case FWL_STYLEEXT_EDT_Distributed: {
+      params.dwAlignment |= FDE_TEXTEDITALIGN_Distributed;
+      break;
+    }
+    default: {
+      params.dwAlignment |= FDE_TEXTEDITALIGN_Normal;
+      break;
+    }
+  }
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_MultiLine) {
+    params.dwMode |= FDE_TEXTEDITMODE_MultiLines;
+    if ((m_pProperties->m_dwStyles & FWL_WGTSTYLE_HScroll) == 0 &&
+        (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_AutoHScroll) == 0) {
+      params.dwMode |=
+          FDE_TEXTEDITMODE_AutoLineWrap | FDE_TEXTEDITMODE_LimitArea_Horz;
+    }
+    if ((m_pProperties->m_dwStyles & FWL_WGTSTYLE_VScroll) == 0 &&
+        (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_AutoVScroll) == 0) {
+      params.dwMode |= FDE_TEXTEDITMODE_LimitArea_Vert;
+    } else {
+      params.fPlateHeight = 0x00FFFFFF;
+    }
+  } else if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_AutoHScroll) ==
+             0) {
+    params.dwMode |= FDE_TEXTEDITMODE_LimitArea_Horz;
+  }
+  if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_ReadOnly) ||
+      (m_pProperties->m_dwStates & FWL_WGTSTATE_Disabled)) {
+    params.dwMode |= FDE_TEXTEDITMODE_ReadOnly;
+  }
+
+  FX_FLOAT* pFontSize =
+      static_cast<FX_FLOAT*>(GetThemeCapacity(CFWL_WidgetCapacity::FontSize));
+  if (!pFontSize)
+    return;
+
+  m_fFontSize = *pFontSize;
+  uint32_t* pFontColor =
+      static_cast<uint32_t*>(GetThemeCapacity(CFWL_WidgetCapacity::TextColor));
+  if (!pFontColor)
+    return;
+
+  params.dwFontColor = *pFontColor;
+  FX_FLOAT* pLineHeight =
+      static_cast<FX_FLOAT*>(GetThemeCapacity(CFWL_WidgetCapacity::LineHeight));
+  if (!pLineHeight)
+    return;
+
+  params.fLineSpace = *pLineHeight;
+  CFGAS_GEFont* pFont =
+      static_cast<CFGAS_GEFont*>(GetThemeCapacity(CFWL_WidgetCapacity::Font));
+  if (!pFont)
+    return;
+
+  params.pFont = pFont;
+  params.fFontSize = m_fFontSize;
+  params.nLineCount = (int32_t)(params.fPlateHeight / params.fLineSpace);
+  if (params.nLineCount <= 0)
+    params.nLineCount = 1;
+  params.fTabWidth = params.fFontSize * 1;
+  params.bTabEquidistant = true;
+  params.wLineBreakChar = L'\n';
+  params.nCharRotation = 0;
+  params.pEventSink = this;
+  m_EdtEngine.SetEditParams(params);
+}
+
+void CFWL_Edit::UpdateEditLayout() {
+  if (m_EdtEngine.GetTextLength() <= 0)
+    m_EdtEngine.SetTextByStream(nullptr);
+
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(0);
+  if (pPage)
+    pPage->UnloadPage(nullptr);
+
+  m_EdtEngine.StartLayout();
+  m_EdtEngine.DoLayout(nullptr);
+  m_EdtEngine.EndLayout();
+  pPage = m_EdtEngine.GetPage(0);
+  if (pPage)
+    pPage->LoadPage(nullptr, nullptr);
+}
+
+bool CFWL_Edit::UpdateOffset() {
+  CFX_RectF rtCaret;
+  m_EdtEngine.GetCaretRect(rtCaret);
+  FX_FLOAT fOffSetX = m_rtEngine.left - m_fScrollOffsetX;
+  FX_FLOAT fOffSetY = m_rtEngine.top - m_fScrollOffsetY + m_fVAlignOffset;
+  rtCaret.Offset(fOffSetX, fOffSetY);
+  const CFX_RectF& rtEidt = m_rtEngine;
+  if (rtEidt.Contains(rtCaret)) {
+    IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(0);
+    if (!pPage)
+      return false;
+
+    CFX_RectF rtFDE = pPage->GetContentsBox();
+    rtFDE.Offset(fOffSetX, fOffSetY);
+    if (rtFDE.right() < rtEidt.right() && m_fScrollOffsetX > 0) {
+      m_fScrollOffsetX += rtFDE.right() - rtEidt.right();
+      m_fScrollOffsetX = std::max(m_fScrollOffsetX, 0.0f);
+    }
+    if (rtFDE.bottom() < rtEidt.bottom() && m_fScrollOffsetY > 0) {
+      m_fScrollOffsetY += rtFDE.bottom() - rtEidt.bottom();
+      m_fScrollOffsetY = std::max(m_fScrollOffsetY, 0.0f);
+    }
+    return false;
+  }
+
+  FX_FLOAT offsetX = 0.0;
+  FX_FLOAT offsetY = 0.0;
+  if (rtCaret.left < rtEidt.left)
+    offsetX = rtCaret.left - rtEidt.left;
+  if (rtCaret.right() > rtEidt.right())
+    offsetX = rtCaret.right() - rtEidt.right();
+  if (rtCaret.top < rtEidt.top)
+    offsetY = rtCaret.top - rtEidt.top;
+  if (rtCaret.bottom() > rtEidt.bottom())
+    offsetY = rtCaret.bottom() - rtEidt.bottom();
+  m_fScrollOffsetX += offsetX;
+  m_fScrollOffsetY += offsetY;
+  if (m_fFontSize > m_rtEngine.height)
+    m_fScrollOffsetY = 0;
+  return true;
+}
+
+bool CFWL_Edit::UpdateOffset(CFWL_ScrollBar* pScrollBar, FX_FLOAT fPosChanged) {
+  if (pScrollBar == m_pHorzScrollBar.get())
+    m_fScrollOffsetX += fPosChanged;
+  else
+    m_fScrollOffsetY += fPosChanged;
+  return true;
+}
+
+void CFWL_Edit::UpdateVAlignment() {
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(0);
+  if (!pPage)
+    return;
+
+  const CFX_RectF& rtFDE = pPage->GetContentsBox();
+  FX_FLOAT fOffsetY = 0.0f;
+  FX_FLOAT fSpaceAbove = 0.0f;
+  FX_FLOAT fSpaceBelow = 0.0f;
+  CFX_SizeF* pSpace = static_cast<CFX_SizeF*>(
+      GetThemeCapacity(CFWL_WidgetCapacity::SpaceAboveBelow));
+  if (pSpace) {
+    fSpaceAbove = pSpace->x;
+    fSpaceBelow = pSpace->y;
+  }
+  if (fSpaceAbove < 0.1f)
+    fSpaceAbove = 0;
+  if (fSpaceBelow < 0.1f)
+    fSpaceBelow = 0;
+
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_VCenter) {
+    fOffsetY = (m_rtEngine.height - rtFDE.height) / 2;
+    if (fOffsetY < (fSpaceAbove + fSpaceBelow) / 2 &&
+        fSpaceAbove < fSpaceBelow) {
+      return;
+    }
+    fOffsetY += (fSpaceAbove - fSpaceBelow) / 2;
+  } else if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_VFar) {
+    fOffsetY = (m_rtEngine.height - rtFDE.height);
+    fOffsetY -= fSpaceBelow;
+  } else {
+    fOffsetY += fSpaceAbove;
+  }
+  m_fVAlignOffset = std::max(fOffsetY, 0.0f);
+}
+
+void CFWL_Edit::UpdateCaret() {
+  CFX_RectF rtFDE;
+  m_EdtEngine.GetCaretRect(rtFDE);
+
+  rtFDE.Offset(m_rtEngine.left - m_fScrollOffsetX,
+               m_rtEngine.top - m_fScrollOffsetY + m_fVAlignOffset);
+  CFX_RectF rtCaret;
+  rtCaret.Set(rtFDE.left, rtFDE.top, rtFDE.width, rtFDE.height);
+
+  CFX_RectF rtClient;
+  GetClientRect(rtClient);
+  rtCaret.Intersect(rtClient);
+
+  if (rtCaret.left > rtClient.right()) {
+    FX_FLOAT right = rtCaret.right();
+    rtCaret.left = rtClient.right() - 1;
+    rtCaret.width = right - rtCaret.left;
+  }
+
+  bool bShow =
+      m_pProperties->m_dwStates & FWL_WGTSTATE_Focused && !rtCaret.IsEmpty();
+  ShowCaret(bShow, &rtCaret);
+}
+
+CFWL_ScrollBar* CFWL_Edit::UpdateScroll() {
+  bool bShowHorz =
+      m_pHorzScrollBar &&
+      ((m_pHorzScrollBar->GetStates() & FWL_WGTSTATE_Invisible) == 0);
+  bool bShowVert =
+      m_pVertScrollBar &&
+      ((m_pVertScrollBar->GetStates() & FWL_WGTSTATE_Invisible) == 0);
+  if (!bShowHorz && !bShowVert)
+    return nullptr;
+
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(0);
+  if (!pPage)
+    return nullptr;
+
+  const CFX_RectF& rtFDE = pPage->GetContentsBox();
+  CFWL_ScrollBar* pRepaint = nullptr;
+  if (bShowHorz) {
+    CFX_RectF rtScroll;
+    m_pHorzScrollBar->GetWidgetRect(rtScroll);
+    if (rtScroll.width < rtFDE.width) {
+      m_pHorzScrollBar->LockUpdate();
+      FX_FLOAT fRange = rtFDE.width - rtScroll.width;
+      m_pHorzScrollBar->SetRange(0.0f, fRange);
+
+      FX_FLOAT fPos = std::min(std::max(m_fScrollOffsetX, 0.0f), fRange);
+      m_pHorzScrollBar->SetPos(fPos);
+      m_pHorzScrollBar->SetTrackPos(fPos);
+      m_pHorzScrollBar->SetPageSize(rtScroll.width);
+      m_pHorzScrollBar->SetStepSize(rtScroll.width / 10);
+      m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Disabled, false);
+      m_pHorzScrollBar->UnlockUpdate();
+      m_pHorzScrollBar->Update();
+      pRepaint = m_pHorzScrollBar.get();
+    } else if ((m_pHorzScrollBar->GetStates() & FWL_WGTSTATE_Disabled) == 0) {
+      m_pHorzScrollBar->LockUpdate();
+      m_pHorzScrollBar->SetRange(0, -1);
+      m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Disabled, true);
+      m_pHorzScrollBar->UnlockUpdate();
+      m_pHorzScrollBar->Update();
+      pRepaint = m_pHorzScrollBar.get();
+    }
+  }
+
+  if (bShowVert) {
+    CFX_RectF rtScroll;
+    m_pVertScrollBar->GetWidgetRect(rtScroll);
+    if (rtScroll.height < rtFDE.height) {
+      m_pVertScrollBar->LockUpdate();
+      FX_FLOAT fStep = m_EdtEngine.GetEditParams()->fLineSpace;
+      FX_FLOAT fRange = std::max(rtFDE.height - m_rtEngine.height, fStep);
+
+      m_pVertScrollBar->SetRange(0.0f, fRange);
+      FX_FLOAT fPos = std::min(std::max(m_fScrollOffsetY, 0.0f), fRange);
+      m_pVertScrollBar->SetPos(fPos);
+      m_pVertScrollBar->SetTrackPos(fPos);
+      m_pVertScrollBar->SetPageSize(rtScroll.height);
+      m_pVertScrollBar->SetStepSize(fStep);
+      m_pVertScrollBar->SetStates(FWL_WGTSTATE_Disabled, false);
+      m_pVertScrollBar->UnlockUpdate();
+      m_pVertScrollBar->Update();
+      pRepaint = m_pVertScrollBar.get();
+    } else if ((m_pVertScrollBar->GetStates() & FWL_WGTSTATE_Disabled) == 0) {
+      m_pVertScrollBar->LockUpdate();
+      m_pVertScrollBar->SetRange(0, -1);
+      m_pVertScrollBar->SetStates(FWL_WGTSTATE_Disabled, true);
+      m_pVertScrollBar->UnlockUpdate();
+      m_pVertScrollBar->Update();
+      pRepaint = m_pVertScrollBar.get();
+    }
+  }
+  return pRepaint;
+}
+
+bool CFWL_Edit::IsShowScrollBar(bool bVert) {
+  bool bShow =
+      (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_ShowScrollbarFocus)
+          ? (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused) ==
+                FWL_WGTSTATE_Focused
+          : true;
+  if (bVert) {
+    return bShow && (m_pProperties->m_dwStyles & FWL_WGTSTYLE_VScroll) &&
+           (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_MultiLine) &&
+           IsContentHeightOverflow();
+  }
+  return bShow && (m_pProperties->m_dwStyles & FWL_WGTSTYLE_HScroll) &&
+         (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_MultiLine);
+}
+
+bool CFWL_Edit::IsContentHeightOverflow() {
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(0);
+  if (!pPage)
+    return false;
+  return pPage->GetContentsBox().height > m_rtEngine.height + 1.0f;
+}
+
+int32_t CFWL_Edit::AddDoRecord(IFDE_TxtEdtDoRecord* pRecord) {
+  int32_t nCount = pdfium::CollectionSize<int32_t>(m_DoRecords);
+  if (m_iCurRecord == nCount - 1) {
+    if (nCount == m_iMaxRecord) {
+      m_DoRecords.pop_front();
+      m_iCurRecord--;
+    }
+  } else {
+    m_DoRecords.erase(m_DoRecords.begin() + m_iCurRecord + 1,
+                      m_DoRecords.end());
+  }
+
+  m_DoRecords.push_back(std::unique_ptr<IFDE_TxtEdtDoRecord>(pRecord));
+  m_iCurRecord = pdfium::CollectionSize<int32_t>(m_DoRecords) - 1;
+  return m_iCurRecord;
+}
+
+void CFWL_Edit::Layout() {
+  GetClientRect(m_rtClient);
+  m_rtEngine = m_rtClient;
+  FX_FLOAT* pfWidth = static_cast<FX_FLOAT*>(
+      GetThemeCapacity(CFWL_WidgetCapacity::ScrollBarWidth));
+  if (!pfWidth)
+    return;
+
+  FX_FLOAT fWidth = *pfWidth;
+  if (!m_pOuter) {
+    CFX_RectF* pUIMargin = static_cast<CFX_RectF*>(
+        GetThemeCapacity(CFWL_WidgetCapacity::UIMargin));
+    if (pUIMargin) {
+      m_rtEngine.Deflate(pUIMargin->left, pUIMargin->top, pUIMargin->width,
+                         pUIMargin->height);
+    }
+  } else if (m_pOuter->GetClassID() == FWL_Type::DateTimePicker) {
+    CFWL_ThemePart part;
+    part.m_pWidget = m_pOuter;
+    CFX_RectF* pUIMargin =
+        static_cast<CFX_RectF*>(m_pOuter->GetThemeProvider()->GetCapacity(
+            &part, CFWL_WidgetCapacity::UIMargin));
+    if (pUIMargin) {
+      m_rtEngine.Deflate(pUIMargin->left, pUIMargin->top, pUIMargin->width,
+                         pUIMargin->height);
+    }
+  }
+
+  bool bShowVertScrollbar = IsShowScrollBar(true);
+  bool bShowHorzScrollbar = IsShowScrollBar(false);
+  if (bShowVertScrollbar) {
+    InitScrollBar();
+
+    CFX_RectF rtVertScr;
+    if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_OuterScrollbar) {
+      rtVertScr.Set(m_rtClient.right() + kEditMargin, m_rtClient.top, fWidth,
+                    m_rtClient.height);
+    } else {
+      rtVertScr.Set(m_rtClient.right() - fWidth, m_rtClient.top, fWidth,
+                    m_rtClient.height);
+      if (bShowHorzScrollbar)
+        rtVertScr.height -= fWidth;
+      m_rtEngine.width -= fWidth;
+    }
+
+    m_pVertScrollBar->SetWidgetRect(rtVertScr);
+    m_pVertScrollBar->SetStates(FWL_WGTSTATE_Invisible, false);
+    m_pVertScrollBar->Update();
+  } else if (m_pVertScrollBar) {
+    m_pVertScrollBar->SetStates(FWL_WGTSTATE_Invisible, true);
+  }
+
+  if (bShowHorzScrollbar) {
+    InitScrollBar(false);
+
+    CFX_RectF rtHoriScr;
+    if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_OuterScrollbar) {
+      rtHoriScr.Set(m_rtClient.left, m_rtClient.bottom() + kEditMargin,
+                    m_rtClient.width, fWidth);
+    } else {
+      rtHoriScr.Set(m_rtClient.left, m_rtClient.bottom() - fWidth,
+                    m_rtClient.width, fWidth);
+      if (bShowVertScrollbar)
+        rtHoriScr.width -= fWidth;
+      m_rtEngine.height -= fWidth;
+    }
+    m_pHorzScrollBar->SetWidgetRect(rtHoriScr);
+    m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Invisible, false);
+    m_pHorzScrollBar->Update();
+  } else if (m_pHorzScrollBar) {
+    m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Invisible, true);
+  }
+}
+
+void CFWL_Edit::LayoutScrollBar() {
+  if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_ShowScrollbarFocus) ==
+      0) {
+    return;
+  }
+
+  FX_FLOAT* pfWidth = nullptr;
+  bool bShowVertScrollbar = IsShowScrollBar(true);
+  bool bShowHorzScrollbar = IsShowScrollBar(false);
+  if (bShowVertScrollbar) {
+    if (!m_pVertScrollBar) {
+      pfWidth = static_cast<FX_FLOAT*>(
+          GetThemeCapacity(CFWL_WidgetCapacity::ScrollBarWidth));
+      FX_FLOAT fWidth = pfWidth ? *pfWidth : 0;
+      InitScrollBar();
+      CFX_RectF rtVertScr;
+      if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_OuterScrollbar) {
+        rtVertScr.Set(m_rtClient.right() + kEditMargin, m_rtClient.top, fWidth,
+                      m_rtClient.height);
+      } else {
+        rtVertScr.Set(m_rtClient.right() - fWidth, m_rtClient.top, fWidth,
+                      m_rtClient.height);
+        if (bShowHorzScrollbar)
+          rtVertScr.height -= fWidth;
+      }
+      m_pVertScrollBar->SetWidgetRect(rtVertScr);
+      m_pVertScrollBar->Update();
+    }
+    m_pVertScrollBar->SetStates(FWL_WGTSTATE_Invisible, false);
+  } else if (m_pVertScrollBar) {
+    m_pVertScrollBar->SetStates(FWL_WGTSTATE_Invisible, true);
+  }
+
+  if (bShowHorzScrollbar) {
+    if (!m_pHorzScrollBar) {
+      if (!pfWidth) {
+        pfWidth = static_cast<FX_FLOAT*>(
+            GetThemeCapacity(CFWL_WidgetCapacity::ScrollBarWidth));
+      }
+
+      FX_FLOAT fWidth = pfWidth ? *pfWidth : 0;
+      InitScrollBar(false);
+      CFX_RectF rtHoriScr;
+      if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_OuterScrollbar) {
+        rtHoriScr.Set(m_rtClient.left, m_rtClient.bottom() + kEditMargin,
+                      m_rtClient.width, fWidth);
+      } else {
+        rtHoriScr.Set(m_rtClient.left, m_rtClient.bottom() - fWidth,
+                      m_rtClient.width, fWidth);
+        if (bShowVertScrollbar)
+          rtHoriScr.width -= (fWidth);
+      }
+      m_pHorzScrollBar->SetWidgetRect(rtHoriScr);
+      m_pHorzScrollBar->Update();
+    }
+    m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Invisible, false);
+  } else if (m_pHorzScrollBar) {
+    m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Invisible, true);
+  }
+  if (bShowVertScrollbar || bShowHorzScrollbar)
+    UpdateScroll();
+}
+
+void CFWL_Edit::DeviceToEngine(CFX_PointF& pt) {
+  pt.x += m_fScrollOffsetX - m_rtEngine.left;
+  pt.y += m_fScrollOffsetY - m_rtEngine.top - m_fVAlignOffset;
+}
+
+void CFWL_Edit::InitScrollBar(bool bVert) {
+  if ((bVert && m_pVertScrollBar) || (!bVert && m_pHorzScrollBar))
+    return;
+
+  auto prop = pdfium::MakeUnique<CFWL_WidgetProperties>();
+  prop->m_dwStyleExes = bVert ? FWL_STYLEEXT_SCB_Vert : FWL_STYLEEXT_SCB_Horz;
+  prop->m_dwStates = FWL_WGTSTATE_Disabled | FWL_WGTSTATE_Invisible;
+  prop->m_pParent = this;
+  prop->m_pThemeProvider = m_pProperties->m_pThemeProvider;
+
+  CFWL_ScrollBar* sb = new CFWL_ScrollBar(m_pOwnerApp, std::move(prop), this);
+  if (bVert)
+    m_pVertScrollBar.reset(sb);
+  else
+    m_pHorzScrollBar.reset(sb);
+}
+
+bool FWL_ShowCaret(CFWL_Widget* pWidget,
+                   bool bVisible,
+                   const CFX_RectF* pRtAnchor) {
+  CXFA_FFWidget* pXFAWidget =
+      static_cast<CXFA_FFWidget*>(pWidget->GetLayoutItem());
+  if (!pXFAWidget)
+    return false;
+
+  IXFA_DocEnvironment* pDocEnvironment =
+      pXFAWidget->GetDoc()->GetDocEnvironment();
+  if (!pDocEnvironment)
+    return false;
+
+  if (bVisible) {
+    CFX_Matrix mt;
+    pXFAWidget->GetRotateMatrix(mt);
+    CFX_RectF rt(*pRtAnchor);
+    mt.TransformRect(rt);
+    pDocEnvironment->DisplayCaret(pXFAWidget, bVisible, &rt);
+    return true;
+  }
+
+  pDocEnvironment->DisplayCaret(pXFAWidget, bVisible, pRtAnchor);
+  return true;
+}
+
+void CFWL_Edit::ShowCaret(bool bVisible, CFX_RectF* pRect) {
+  if (m_pCaret) {
+    m_pCaret->ShowCaret(bVisible);
+    if (bVisible && !pRect->IsEmpty())
+      m_pCaret->SetWidgetRect(*pRect);
+    Repaint(&m_rtEngine);
+    return;
+  }
+
+  CFWL_Widget* pOuter = this;
+  if (bVisible) {
+    pRect->Offset(m_pProperties->m_rtWidget.left,
+                  m_pProperties->m_rtWidget.top);
+  }
+  while (pOuter->GetOuter()) {
+    pOuter = pOuter->GetOuter();
+    if (bVisible) {
+      CFX_RectF rtOuter;
+      pOuter->GetWidgetRect(rtOuter);
+      pRect->Offset(rtOuter.left, rtOuter.top);
+    }
+  }
+  FWL_ShowCaret(pOuter, bVisible, pRect);
+}
+
+bool CFWL_Edit::ValidateNumberChar(FX_WCHAR cNum) {
+  if (!m_bSetRange)
+    return true;
+
+  CFX_WideString wsOld, wsText;
+  m_EdtEngine.GetText(wsText, 0);
+  if (wsText.IsEmpty()) {
+    if (cNum == L'0')
+      return false;
+    return true;
+  }
+
+  int32_t caretPos = m_EdtEngine.GetCaretPos();
+  if (CountSelRanges() == 0) {
+    if (cNum == L'0' && caretPos == 0)
+      return false;
+
+    int32_t nLen = wsText.GetLength();
+    CFX_WideString l = wsText.Mid(0, caretPos);
+    CFX_WideString r = wsText.Mid(caretPos, nLen - caretPos);
+    CFX_WideString wsNew = l + cNum + r;
+    if (wsNew.GetInteger() <= m_iMax)
+      return true;
+    return false;
+  }
+
+  if (wsText.GetInteger() <= m_iMax)
+    return true;
+  return false;
+}
+
+void CFWL_Edit::InitCaret() {
+  if (!m_pCaret) {
+    if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_InnerCaret)) {
+      m_pCaret.reset(new CFWL_Caret(
+          m_pOwnerApp, pdfium::MakeUnique<CFWL_WidgetProperties>(), this));
+      m_pCaret->SetParent(this);
+      m_pCaret->SetStates(m_pProperties->m_dwStates);
+    }
+  } else if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_InnerCaret) ==
+             0) {
+    m_pCaret.reset();
+  }
+}
+
+void CFWL_Edit::ClearRecord() {
+  m_iCurRecord = -1;
+  m_DoRecords.clear();
+}
+
+void CFWL_Edit::ProcessInsertError(int32_t iError) {
+  if (iError != -2)
+    return;
+
+  CFWL_EvtTextFull textFullEvent;
+  textFullEvent.m_pSrcTarget = this;
+  DispatchEvent(&textFullEvent);
+}
+
+void CFWL_Edit::OnProcessMessage(CFWL_Message* pMessage) {
+  if (!pMessage)
+    return;
+
+  CFWL_MessageType dwMsgCode = pMessage->GetClassID();
+  switch (dwMsgCode) {
+    case CFWL_MessageType::SetFocus:
+    case CFWL_MessageType::KillFocus:
+      OnFocusChanged(pMessage, dwMsgCode == CFWL_MessageType::SetFocus);
+      break;
+    case CFWL_MessageType::Mouse: {
+      CFWL_MsgMouse* pMsg = static_cast<CFWL_MsgMouse*>(pMessage);
+      switch (pMsg->m_dwCmd) {
+        case FWL_MouseCommand::LeftButtonDown:
+          OnLButtonDown(pMsg);
+          break;
+        case FWL_MouseCommand::LeftButtonUp:
+          OnLButtonUp(pMsg);
+          break;
+        case FWL_MouseCommand::LeftButtonDblClk:
+          OnButtonDblClk(pMsg);
+          break;
+        case FWL_MouseCommand::Move:
+          OnMouseMove(pMsg);
+          break;
+        case FWL_MouseCommand::RightButtonDown:
+          DoButtonDown(pMsg);
+          break;
+        default:
+          break;
+      }
+      break;
+    }
+    case CFWL_MessageType::Key: {
+      CFWL_MsgKey* pKey = static_cast<CFWL_MsgKey*>(pMessage);
+      if (pKey->m_dwCmd == FWL_KeyCommand::KeyDown)
+        OnKeyDown(pKey);
+      else if (pKey->m_dwCmd == FWL_KeyCommand::Char)
+        OnChar(pKey);
+      break;
+    }
+    default:
+      break;
+  }
+  CFWL_Widget::OnProcessMessage(pMessage);
+}
+
+void CFWL_Edit::OnProcessEvent(CFWL_Event* pEvent) {
+  if (!pEvent)
+    return;
+  if (pEvent->GetClassID() != CFWL_EventType::Scroll)
+    return;
+
+  CFWL_Widget* pSrcTarget = pEvent->m_pSrcTarget;
+  if ((pSrcTarget == m_pVertScrollBar.get() && m_pVertScrollBar) ||
+      (pSrcTarget == m_pHorzScrollBar.get() && m_pHorzScrollBar)) {
+    CFWL_EvtScroll* pScrollEvent = static_cast<CFWL_EvtScroll*>(pEvent);
+    OnScroll(static_cast<CFWL_ScrollBar*>(pSrcTarget),
+             pScrollEvent->m_iScrollCode, pScrollEvent->m_fPos);
+  }
+}
+
+void CFWL_Edit::OnDrawWidget(CFX_Graphics* pGraphics,
+                             const CFX_Matrix* pMatrix) {
+  DrawWidget(pGraphics, pMatrix);
+}
+
+void CFWL_Edit::DoButtonDown(CFWL_MsgMouse* pMsg) {
+  if ((m_pProperties->m_dwStates & FWL_WGTSTATE_Focused) == 0)
+    SetFocus(true);
+
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(0);
+  if (!pPage)
+    return;
+
+  CFX_PointF pt(pMsg->m_fx, pMsg->m_fy);
+  DeviceToEngine(pt);
+  bool bBefore = true;
+  int32_t nIndex = pPage->GetCharIndex(pt, bBefore);
+  if (nIndex < 0)
+    nIndex = 0;
+
+  m_EdtEngine.SetCaretPos(nIndex, bBefore);
+}
+
+void CFWL_Edit::OnFocusChanged(CFWL_Message* pMsg, bool bSet) {
+  uint32_t dwStyleEx = GetStylesEx();
+  bool bRepaint = !!(dwStyleEx & FWL_STYLEEXT_EDT_InnerCaret);
+  if (bSet) {
+    m_pProperties->m_dwStates |= FWL_WGTSTATE_Focused;
+
+    UpdateVAlignment();
+    UpdateOffset();
+    UpdateCaret();
+  } else if (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused) {
+    m_pProperties->m_dwStates &= ~FWL_WGTSTATE_Focused;
+    ShowCaret(false);
+    if ((dwStyleEx & FWL_STYLEEXT_EDT_NoHideSel) == 0) {
+      int32_t nSel = CountSelRanges();
+      if (nSel > 0) {
+        ClearSelections();
+        bRepaint = true;
+      }
+      m_EdtEngine.SetCaretPos(0, true);
+      UpdateOffset();
+    }
+    ClearRecord();
+  }
+
+  LayoutScrollBar();
+  if (!bRepaint)
+    return;
+
+  CFX_RectF rtInvalidate;
+  rtInvalidate.Set(0, 0, m_pProperties->m_rtWidget.width,
+                   m_pProperties->m_rtWidget.height);
+  Repaint(&rtInvalidate);
+}
+
+void CFWL_Edit::OnLButtonDown(CFWL_MsgMouse* pMsg) {
+  if (m_pProperties->m_dwStates & FWL_WGTSTATE_Disabled)
+    return;
+
+  m_bLButtonDown = true;
+  SetGrab(true);
+  DoButtonDown(pMsg);
+  int32_t nIndex = m_EdtEngine.GetCaretPos();
+  bool bRepaint = false;
+  if (m_EdtEngine.CountSelRanges() > 0) {
+    m_EdtEngine.ClearSelection();
+    bRepaint = true;
+  }
+
+  if ((pMsg->m_dwFlags & FWL_KEYFLAG_Shift) && m_nSelStart != nIndex) {
+    int32_t iStart = std::min(m_nSelStart, nIndex);
+    int32_t iEnd = std::max(m_nSelStart, nIndex);
+    m_EdtEngine.AddSelRange(iStart, iEnd - iStart);
+    bRepaint = true;
+  } else {
+    m_nSelStart = nIndex;
+  }
+  if (bRepaint)
+    Repaint(&m_rtEngine);
+}
+
+void CFWL_Edit::OnLButtonUp(CFWL_MsgMouse* pMsg) {
+  m_bLButtonDown = false;
+  SetGrab(false);
+}
+
+void CFWL_Edit::OnButtonDblClk(CFWL_MsgMouse* pMsg) {
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(0);
+  if (!pPage)
+    return;
+
+  CFX_PointF pt(pMsg->m_fx, pMsg->m_fy);
+  DeviceToEngine(pt);
+  int32_t nCount = 0;
+  int32_t nIndex = pPage->SelectWord(pt, nCount);
+  if (nIndex < 0)
+    return;
+
+  m_EdtEngine.AddSelRange(nIndex, nCount);
+  m_EdtEngine.SetCaretPos(nIndex + nCount - 1, false);
+  Repaint(&m_rtEngine);
+}
+
+void CFWL_Edit::OnMouseMove(CFWL_MsgMouse* pMsg) {
+  if (m_nSelStart == -1 || !m_bLButtonDown)
+    return;
+
+  IFDE_TxtEdtPage* pPage = m_EdtEngine.GetPage(0);
+  if (!pPage)
+    return;
+
+  CFX_PointF pt(pMsg->m_fx, pMsg->m_fy);
+  DeviceToEngine(pt);
+  bool bBefore = true;
+  int32_t nIndex = pPage->GetCharIndex(pt, bBefore);
+  m_EdtEngine.SetCaretPos(nIndex, bBefore);
+  nIndex = m_EdtEngine.GetCaretPos();
+  m_EdtEngine.ClearSelection();
+
+  if (nIndex == m_nSelStart)
+    return;
+
+  int32_t nLen = m_EdtEngine.GetTextLength();
+  if (m_nSelStart >= nLen)
+    m_nSelStart = nLen;
+
+  m_EdtEngine.AddSelRange(std::min(m_nSelStart, nIndex),
+                          FXSYS_abs(nIndex - m_nSelStart));
+}
+
+void CFWL_Edit::OnKeyDown(CFWL_MsgKey* pMsg) {
+  FDE_TXTEDTMOVECARET MoveCaret = MC_MoveNone;
+  bool bShift = !!(pMsg->m_dwFlags & FWL_KEYFLAG_Shift);
+  bool bCtrl = !!(pMsg->m_dwFlags & FWL_KEYFLAG_Ctrl);
+  uint32_t dwKeyCode = pMsg->m_dwKeyCode;
+  switch (dwKeyCode) {
+    case FWL_VKEY_Left: {
+      MoveCaret = MC_Left;
+      break;
+    }
+    case FWL_VKEY_Right: {
+      MoveCaret = MC_Right;
+      break;
+    }
+    case FWL_VKEY_Up: {
+      MoveCaret = MC_Up;
+      break;
+    }
+    case FWL_VKEY_Down: {
+      MoveCaret = MC_Down;
+      break;
+    }
+    case FWL_VKEY_Home: {
+      MoveCaret = bCtrl ? MC_Home : MC_LineStart;
+      break;
+    }
+    case FWL_VKEY_End: {
+      MoveCaret = bCtrl ? MC_End : MC_LineEnd;
+      break;
+    }
+    case FWL_VKEY_Insert:
+      break;
+    case FWL_VKEY_Delete: {
+      if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_ReadOnly) ||
+          (m_pProperties->m_dwStates & FWL_WGTSTATE_Disabled)) {
+        break;
+      }
+      int32_t nCaret = m_EdtEngine.GetCaretPos();
+#if (_FX_OS_ == _FX_MACOSX_)
+      m_EdtEngine.Delete(nCaret, true);
+#else
+      m_EdtEngine.Delete(nCaret);
+#endif
+      break;
+    }
+    case FWL_VKEY_F2:
+      break;
+    case FWL_VKEY_Tab: {
+      DispatchKeyEvent(pMsg);
+      break;
+    }
+    default:
+      break;
+  }
+  if (MoveCaret != MC_MoveNone)
+    m_EdtEngine.MoveCaretPos(MoveCaret, bShift, bCtrl);
+}
+
+void CFWL_Edit::OnChar(CFWL_MsgKey* pMsg) {
+  if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_ReadOnly) ||
+      (m_pProperties->m_dwStates & FWL_WGTSTATE_Disabled)) {
+    return;
+  }
+
+  int32_t iError = 0;
+  FX_WCHAR c = static_cast<FX_WCHAR>(pMsg->m_dwKeyCode);
+  int32_t nCaret = m_EdtEngine.GetCaretPos();
+  switch (c) {
+    case FWL_VKEY_Back:
+      m_EdtEngine.Delete(nCaret, true);
+      break;
+    case FWL_VKEY_NewLine:
+    case FWL_VKEY_Escape:
+      break;
+    case FWL_VKEY_Tab: {
+      iError = m_EdtEngine.Insert(nCaret, L"\t", 1);
+      break;
+    }
+    case FWL_VKEY_Return: {
+      if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_WantReturn) {
+        iError = m_EdtEngine.Insert(nCaret, L"\n", 1);
+      }
+      break;
+    }
+    default: {
+      if (!m_pWidgetMgr->IsFormDisabled()) {
+        if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_EDT_Number) {
+          if (((pMsg->m_dwKeyCode < FWL_VKEY_0) &&
+               (pMsg->m_dwKeyCode != 0x2E && pMsg->m_dwKeyCode != 0x2D)) ||
+              pMsg->m_dwKeyCode > FWL_VKEY_9) {
+            break;
+          }
+          if (!ValidateNumberChar(c))
+            break;
+        }
+      }
+#if (_FX_OS_ == _FX_MACOSX_)
+      if (pMsg->m_dwFlags & FWL_KEYFLAG_Command)
+#else
+      if (pMsg->m_dwFlags & FWL_KEYFLAG_Ctrl)
+#endif
+      {
+        break;
+      }
+      iError = m_EdtEngine.Insert(nCaret, &c, 1);
+      break;
+    }
+  }
+  if (iError < 0)
+    ProcessInsertError(iError);
+}
+
+bool CFWL_Edit::OnScroll(CFWL_ScrollBar* pScrollBar,
+                         FWL_SCBCODE dwCode,
+                         FX_FLOAT fPos) {
+  CFX_SizeF fs;
+  pScrollBar->GetRange(&fs.x, &fs.y);
+  FX_FLOAT iCurPos = pScrollBar->GetPos();
+  FX_FLOAT fStep = pScrollBar->GetStepSize();
+  switch (dwCode) {
+    case FWL_SCBCODE::Min: {
+      fPos = fs.x;
+      break;
+    }
+    case FWL_SCBCODE::Max: {
+      fPos = fs.y;
+      break;
+    }
+    case FWL_SCBCODE::StepBackward: {
+      fPos -= fStep;
+      if (fPos < fs.x + fStep / 2) {
+        fPos = fs.x;
+      }
+      break;
+    }
+    case FWL_SCBCODE::StepForward: {
+      fPos += fStep;
+      if (fPos > fs.y - fStep / 2) {
+        fPos = fs.y;
+      }
+      break;
+    }
+    case FWL_SCBCODE::PageBackward: {
+      fPos -= pScrollBar->GetPageSize();
+      if (fPos < fs.x) {
+        fPos = fs.x;
+      }
+      break;
+    }
+    case FWL_SCBCODE::PageForward: {
+      fPos += pScrollBar->GetPageSize();
+      if (fPos > fs.y) {
+        fPos = fs.y;
+      }
+      break;
+    }
+    case FWL_SCBCODE::Pos:
+    case FWL_SCBCODE::TrackPos:
+    case FWL_SCBCODE::None:
+      break;
+    case FWL_SCBCODE::EndScroll:
+      return false;
+  }
+  if (iCurPos == fPos)
+    return true;
+
+  pScrollBar->SetPos(fPos);
+  pScrollBar->SetTrackPos(fPos);
+  UpdateOffset(pScrollBar, fPos - iCurPos);
+  UpdateCaret();
+
+  CFX_RectF rect;
+  GetWidgetRect(rect);
+  CFX_RectF rtInvalidate;
+  rtInvalidate.Set(0, 0, rect.width + 2, rect.height + 2);
+  Repaint(&rtInvalidate);
+  return true;
 }