Move xfa/src up to xfa/.

This CL moves the xfa/src files up to the xfa/ directory and fixes the includes,
include guards, and build files.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1803723002 .

1 files changed, 1783 insertions, 0 deletions

diff --git a/xfa/fee/fde_txtedtengine.cpp b/xfa/fee/fde_txtedtengine.cpp
new file mode 100644
index 0000000000..3afd20cf80
--- /dev/null
+++ b/xfa/fee/fde_txtedtengine.cpp
@@ -0,0 +1,1783 @@
+// 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
+
+#include "xfa/fee/fde_txtedtengine.h"
+
+#include <algorithm>
+
+#include "xfa/fde/tto/fde_textout.h"
+#include "xfa/fee/fde_txtedtbuf.h"
+#include "xfa/fee/fde_txtedtparag.h"
+#include "xfa/fee/ifde_txtedtbuf.h"
+#include "xfa/fee/ifde_txtedtengine.h"
+#include "xfa/fee/ifde_txtedtpage.h"
+
+#define FDE_PAGEWIDTH_MAX 0xFFFF
+#define FDE_TXTPLATESIZE (1024 * 12)
+#define FDE_UNICODE_PARAGRAPH_SPERATOR (0x2029)
+#define FDE_TXTEDT_DORECORD_INS 0
+#define FDE_TXTEDT_DORECORD_DEL 1
+
+IFDE_TxtEdtEngine* IFDE_TxtEdtEngine::Create() {
+  return new CFDE_TxtEdtEngine();
+}
+CFDE_TxtEdtEngine::CFDE_TxtEdtEngine()
+    : m_pTextBreak(nullptr),
+      m_nPageLineCount(20),
+      m_nLineCount(0),
+      m_nAnchorPos(-1),
+      m_nLayoutPos(0),
+      m_fCaretPosReserve(0.0),
+      m_nCaret(0),
+      m_bBefore(TRUE),
+      m_nCaretPage(0),
+      m_dwFindFlags(0),
+      m_bLock(FALSE),
+      m_nLimit(0),
+      m_wcAliasChar(L'*'),
+      m_nFirstLineEnd(FDE_TXTEDIT_LINEEND_Auto),
+      m_bAutoLineEnd(TRUE),
+      m_wLineEnd(FDE_UNICODE_PARAGRAPH_SPERATOR) {
+  FXSYS_memset(&m_rtCaret, 0, sizeof(CFX_RectF));
+  m_pTxtBuf = new CFDE_TxtEdtBuf();
+  m_bAutoLineEnd = (m_Param.nLineEnd == FDE_TXTEDIT_LINEEND_Auto);
+}
+CFDE_TxtEdtEngine::~CFDE_TxtEdtEngine() {
+  if (m_pTxtBuf) {
+    m_pTxtBuf->Release();
+    m_pTxtBuf = NULL;
+  }
+  if (m_pTextBreak) {
+    m_pTextBreak->Release();
+    m_pTextBreak = NULL;
+  }
+  RemoveAllParags();
+  RemoveAllPages();
+  m_Param.pEventSink = NULL;
+  ClearSelection();
+}
+void CFDE_TxtEdtEngine::Release() {
+  delete this;
+}
+void CFDE_TxtEdtEngine::SetEditParams(const FDE_TXTEDTPARAMS& params) {
+  if (m_pTextBreak == NULL) {
+    m_pTextBreak = IFX_TxtBreak::Create(FX_TXTBREAKPOLICY_None);
+  }
+  FXSYS_memcpy(&m_Param, &params, sizeof(FDE_TXTEDTPARAMS));
+  m_wLineEnd = params.wLineBreakChar;
+  m_bAutoLineEnd = (m_Param.nLineEnd == FDE_TXTEDIT_LINEEND_Auto);
+  UpdateTxtBreak();
+}
+const FDE_TXTEDTPARAMS* CFDE_TxtEdtEngine::GetEditParams() const {
+  return &m_Param;
+}
+int32_t CFDE_TxtEdtEngine::CountPages() const {
+  if (m_nLineCount == 0) {
+    return 0;
+  }
+  return ((m_nLineCount - 1) / m_nPageLineCount) + 1;
+}
+IFDE_TxtEdtPage* CFDE_TxtEdtEngine::GetPage(int32_t nIndex) {
+  if (m_PagePtrArray.GetSize() <= nIndex) {
+    return NULL;
+  }
+  return (IFDE_TxtEdtPage*)m_PagePtrArray[nIndex];
+}
+FX_BOOL CFDE_TxtEdtEngine::SetBufChunkSize(int32_t nChunkSize) {
+  return m_pTxtBuf->SetChunkSize(nChunkSize);
+}
+void CFDE_TxtEdtEngine::SetTextByStream(IFX_Stream* pStream) {
+  ResetEngine();
+  int32_t nIndex = 0;
+  if (pStream != NULL && pStream->GetLength()) {
+    int32_t nStreamLength = pStream->GetLength();
+    FX_BOOL bValid = TRUE;
+    if (m_nLimit > 0 && nStreamLength > m_nLimit) {
+      bValid = FALSE;
+    }
+    FX_BOOL bPreIsCR = FALSE;
+    if (bValid) {
+      uint8_t bom[4];
+      int32_t nPos = pStream->GetBOM(bom);
+      pStream->Seek(FX_STREAMSEEK_Begin, nPos);
+      int32_t nPlateSize = std::min(nStreamLength, m_pTxtBuf->GetChunkSize());
+      FX_WCHAR* lpwstr = FX_Alloc(FX_WCHAR, nPlateSize);
+      FX_BOOL bEos = false;
+      while (!bEos) {
+        int32_t nRead = pStream->ReadString(lpwstr, nPlateSize, bEos);
+        bPreIsCR = ReplaceParagEnd(lpwstr, nRead, bPreIsCR);
+        m_pTxtBuf->Insert(nIndex, lpwstr, nRead);
+        nIndex += nRead;
+      }
+      FX_Free(lpwstr);
+    }
+  }
+  m_pTxtBuf->Insert(nIndex, &m_wLineEnd, 1);
+  RebuildParagraphs();
+}
+void CFDE_TxtEdtEngine::SetText(const CFX_WideString& wsText) {
+  ResetEngine();
+  int32_t nLength = wsText.GetLength();
+  if (nLength > 0) {
+    CFX_WideString wsTemp;
+    FX_WCHAR* lpBuffer = wsTemp.GetBuffer(nLength);
+    FXSYS_memcpy(lpBuffer, wsText.c_str(), nLength * sizeof(FX_WCHAR));
+    ReplaceParagEnd(lpBuffer, nLength, FALSE);
+    wsTemp.ReleaseBuffer(nLength);
+    if (m_nLimit > 0 && nLength > m_nLimit) {
+      wsTemp.Delete(m_nLimit, nLength - m_nLimit);
+      nLength = m_nLimit;
+    }
+    m_pTxtBuf->SetText(wsTemp);
+  }
+  m_pTxtBuf->Insert(nLength, &m_wLineEnd, 1);
+  RebuildParagraphs();
+}
+int32_t CFDE_TxtEdtEngine::GetTextLength() const {
+  return GetTextBufLength();
+}
+void CFDE_TxtEdtEngine::GetText(CFX_WideString& wsText,
+                                int32_t nStart,
+                                int32_t nCount) {
+  int32_t nTextBufLength = GetTextBufLength();
+  if (nCount == -1) {
+    nCount = nTextBufLength - nStart;
+  }
+  m_pTxtBuf->GetRange(wsText, nStart, nCount);
+  RecoverParagEnd(wsText);
+}
+
+void CFDE_TxtEdtEngine::ClearText() {
+  DeleteRange(0, -1);
+}
+int32_t CFDE_TxtEdtEngine::GetCaretRect(CFX_RectF& rtCaret) const {
+  rtCaret = m_rtCaret;
+  return m_nCaret;
+}
+int32_t CFDE_TxtEdtEngine::GetCaretPos() const {
+  if (IsLocked()) {
+    return 0;
+  }
+  return m_nCaret + (m_bBefore ? 0 : 1);
+}
+int32_t CFDE_TxtEdtEngine::SetCaretPos(int32_t nIndex, FX_BOOL bBefore) {
+  if (IsLocked()) {
+    return 0;
+  }
+  FXSYS_assert(nIndex >= 0 && nIndex <= GetTextBufLength());
+  if (m_PagePtrArray.GetSize() <= m_nCaretPage) {
+    return 0;
+  }
+  m_bBefore = bBefore;
+  m_nCaret = nIndex;
+  MovePage2Char(m_nCaret);
+  GetCaretRect(m_rtCaret, m_nCaretPage, m_nCaret, m_bBefore);
+  if (!m_bBefore) {
+    m_nCaret++;
+    m_bBefore = TRUE;
+  }
+  m_fCaretPosReserve = (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_DocVertical)
+                           ? m_rtCaret.top
+                           : m_rtCaret.left;
+  m_Param.pEventSink->On_CaretChanged(this, m_nCaretPage, 0);
+  m_nAnchorPos = -1;
+  return m_nCaret;
+}
+int32_t CFDE_TxtEdtEngine::MoveCaretPos(FDE_TXTEDTMOVECARET eMoveCaret,
+                                        FX_BOOL bShift,
+                                        FX_BOOL bCtrl) {
+  if (IsLocked()) {
+    return 0;
+  }
+  if (m_PagePtrArray.GetSize() <= m_nCaretPage) {
+    return 0;
+  }
+  FX_BOOL bSelChange = FALSE;
+  if (IsSelect()) {
+    ClearSelection();
+    bSelChange = TRUE;
+  }
+  if (bShift) {
+    if (m_nAnchorPos == -1) {
+      m_nAnchorPos = m_nCaret;
+    }
+  } else {
+    m_nAnchorPos = -1;
+  }
+  FX_BOOL bVertical = m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_DocVertical;
+  switch (eMoveCaret) {
+    case MC_Left: {
+      if (bVertical) {
+        CFX_PointF ptCaret;
+        if (MoveUp(ptCaret)) {
+          UpdateCaretIndex(ptCaret);
+        }
+      } else {
+        FX_BOOL bBefore = TRUE;
+        int32_t nIndex = MoveBackward(bBefore);
+        if (nIndex >= 0) {
+          UpdateCaretRect(nIndex, bBefore);
+        }
+      }
+    } break;
+    case MC_Right: {
+      if (bVertical) {
+        CFX_PointF ptCaret;
+        if (MoveDown(ptCaret)) {
+          UpdateCaretIndex(ptCaret);
+        }
+      } else {
+        FX_BOOL bBefore = TRUE;
+        int32_t nIndex = MoveForward(bBefore);
+        if (nIndex >= 0) {
+          UpdateCaretRect(nIndex, bBefore);
+        }
+      }
+    } break;
+    case MC_Up: {
+      if (bVertical) {
+        FX_BOOL bBefore = TRUE;
+        int32_t nIndex = MoveBackward(bBefore);
+        if (nIndex >= 0) {
+          UpdateCaretRect(nIndex, bBefore);
+        }
+      } else {
+        CFX_PointF ptCaret;
+        if (MoveUp(ptCaret)) {
+          UpdateCaretIndex(ptCaret);
+        }
+      }
+    } break;
+    case MC_Down: {
+      if (bVertical) {
+        FX_BOOL bBefore = TRUE;
+        int32_t nIndex = MoveForward(bBefore);
+        if (nIndex >= 0) {
+          UpdateCaretRect(nIndex, bBefore);
+        }
+      } else {
+        CFX_PointF ptCaret;
+        if (MoveDown(ptCaret)) {
+          UpdateCaretIndex(ptCaret);
+        }
+      }
+    } break;
+    case MC_WordBackward:
+      break;
+    case MC_WordForward:
+      break;
+    case MC_LineStart:
+      MoveLineStart();
+      break;
+    case MC_LineEnd:
+      MoveLineEnd();
+      break;
+    case MC_ParagStart:
+      MoveParagStart();
+      break;
+    case MC_ParagEnd:
+      MoveParagEnd();
+      break;
+    case MC_PageDown:
+      break;
+    case MC_PageUp:
+      break;
+    case MC_Home:
+      MoveHome();
+      break;
+    case MC_End:
+      MoveEnd();
+      break;
+    default:
+      break;
+  }
+  if (bShift && m_nAnchorPos != -1 && (m_nAnchorPos != m_nCaret)) {
+    AddSelRange(std::min(m_nAnchorPos, m_nCaret),
+                FXSYS_abs(m_nAnchorPos - m_nCaret));
+    m_Param.pEventSink->On_SelChanged(this);
+  }
+  if (bSelChange) {
+    m_Param.pEventSink->On_SelChanged(this);
+  }
+  return m_nCaret;
+}
+void CFDE_TxtEdtEngine::Lock() {
+  m_bLock = TRUE;
+}
+void CFDE_TxtEdtEngine::Unlock() {
+  m_bLock = FALSE;
+}
+FX_BOOL CFDE_TxtEdtEngine::IsLocked() const {
+  return m_bLock;
+}
+int32_t CFDE_TxtEdtEngine::Insert(int32_t nStart,
+                                  const FX_WCHAR* lpText,
+                                  int32_t nLength) {
+  if (IsLocked()) {
+    return FDE_TXTEDT_MODIFY_RET_F_Locked;
+  }
+  CFX_WideString wsTemp;
+  FX_WCHAR* lpBuffer = wsTemp.GetBuffer(nLength);
+  FXSYS_memcpy(lpBuffer, lpText, nLength * sizeof(FX_WCHAR));
+  ReplaceParagEnd(lpBuffer, nLength, FALSE);
+  wsTemp.ReleaseBuffer(nLength);
+  FX_BOOL bPart = FALSE;
+  if (m_nLimit > 0) {
+    int32_t nTotalLength = GetTextBufLength();
+    int32_t nCount = m_SelRangePtrArr.GetSize();
+    for (int32_t i = 0; i < nCount; i++) {
+      FDE_LPTXTEDTSELRANGE lpSelRange = m_SelRangePtrArr.GetAt(i);
+      nTotalLength -= lpSelRange->nCount;
+    }
+    int32_t nExpectLength = nTotalLength + nLength;
+    if (nTotalLength == m_nLimit) {
+      return FDE_TXTEDT_MODIFY_RET_F_Full;
+    }
+    if (nExpectLength > m_nLimit) {
+      nLength -= (nExpectLength - m_nLimit);
+      bPart = TRUE;
+    }
+  }
+  if ((m_Param.dwMode & FDE_TEXTEDITMODE_LimitArea_Vert) ||
+      (m_Param.dwMode & FDE_TEXTEDITMODE_LimitArea_Horz)) {
+    int32_t nTemp = nLength;
+    if (m_Param.dwMode & FDE_TEXTEDITMODE_Password) {
+      CFX_WideString wsText;
+      while (nLength > 0) {
+        GetPreInsertText(wsText, m_nCaret, lpBuffer, nLength);
+        int32_t nTotal = wsText.GetLength();
+        FX_WCHAR* lpBuf = wsText.GetBuffer(nTotal);
+        for (int32_t i = 0; i < nTotal; i++) {
+          lpBuf[i] = m_wcAliasChar;
+        }
+        wsText.ReleaseBuffer(nTotal);
+        if (IsFitArea(wsText)) {
+          break;
+        }
+        nLength--;
+      }
+    } else {
+      CFX_WideString wsText;
+      while (nLength > 0) {
+        GetPreInsertText(wsText, m_nCaret, lpBuffer, nLength);
+        if (IsFitArea(wsText)) {
+          break;
+        }
+        nLength--;
+      }
+    }
+    if (nLength == 0) {
+      return FDE_TXTEDT_MODIFY_RET_F_Full;
+    }
+    if (nLength < nTemp) {
+      bPart = TRUE;
+    }
+  }
+  if (m_Param.dwMode & FDE_TEXTEDITMODE_Validate) {
+    CFX_WideString wsText;
+    GetPreInsertText(wsText, m_nCaret, lpBuffer, nLength);
+    if (!m_Param.pEventSink->On_Validate(this, wsText)) {
+      return FDE_TXTEDT_MODIFY_RET_F_Invalidate;
+    }
+  }
+  if (IsSelect()) {
+    DeleteSelect();
+  }
+  if (!(m_Param.dwMode & FDE_TEXTEDITMODE_NoRedoUndo)) {
+    IFDE_TxtEdtDoRecord* pRecord =
+        new CFDE_TxtEdtDoRecord_Insert(this, m_nCaret, lpBuffer, nLength);
+    CFX_ByteString bsDoRecord;
+    pRecord->Serialize(bsDoRecord);
+    m_Param.pEventSink->On_AddDoRecord(this, bsDoRecord);
+    pRecord->Release();
+  }
+  GetText(m_ChangeInfo.wsPrevText, 0);
+  Inner_Insert(m_nCaret, lpBuffer, nLength);
+  m_ChangeInfo.nChangeType = FDE_TXTEDT_TEXTCHANGE_TYPE_Insert;
+  m_ChangeInfo.wsInsert = CFX_WideString(lpBuffer, nLength);
+  nStart = m_nCaret;
+  nStart += nLength;
+  FX_WCHAR wChar = m_pTxtBuf->GetCharByIndex(nStart - 1);
+  FX_BOOL bBefore = TRUE;
+  if (wChar != L'\n' && wChar != L'\r') {
+    nStart--;
+    bBefore = FALSE;
+  }
+  SetCaretPos(nStart, bBefore);
+  m_Param.pEventSink->On_TextChanged(this, m_ChangeInfo);
+  return bPart ? FDE_TXTEDT_MODIFY_RET_S_Part : FDE_TXTEDT_MODIFY_RET_S_Normal;
+}
+int32_t CFDE_TxtEdtEngine::Delete(int32_t nStart, FX_BOOL bBackspace) {
+  if (IsLocked()) {
+    return FDE_TXTEDT_MODIFY_RET_F_Locked;
+  }
+  if (IsSelect()) {
+    DeleteSelect();
+    return FDE_TXTEDT_MODIFY_RET_S_Normal;
+  }
+
+  int32_t nCount = 1;
+  if (bBackspace) {
+    if (nStart == 0) {
+      return FDE_TXTEDT_MODIFY_RET_F_Boundary;
+    }
+    if (nStart > 2 && m_pTxtBuf->GetCharByIndex(nStart - 1) == L'\n' &&
+        m_pTxtBuf->GetCharByIndex(nStart - 2) == L'\r') {
+      nStart--;
+      nCount++;
+    }
+    nStart--;
+  } else {
+    if (nStart == GetTextBufLength()) {
+      return FDE_TXTEDT_MODIFY_RET_F_Full;
+    }
+    if ((nStart + 1 < GetTextBufLength()) &&
+        (m_pTxtBuf->GetCharByIndex(nStart) == L'\r') &&
+        (m_pTxtBuf->GetCharByIndex(nStart + 1) == L'\n')) {
+      nCount++;
+    }
+  }
+  if (m_Param.dwMode & FDE_TEXTEDITMODE_Validate) {
+    CFX_WideString wsText;
+    GetPreDeleteText(wsText, nStart, nCount);
+    if (!m_Param.pEventSink->On_Validate(this, wsText)) {
+      return FDE_TXTEDT_MODIFY_RET_F_Invalidate;
+    }
+  }
+  if (!(m_Param.dwMode & FDE_TEXTEDITMODE_NoRedoUndo)) {
+    CFX_WideString wsRange;
+    m_pTxtBuf->GetRange(wsRange, nStart, nCount);
+    IFDE_TxtEdtDoRecord* pRecord =
+        new CFDE_TxtEdtDoRecord_DeleteRange(this, nStart, m_nCaret, wsRange);
+    CFX_ByteString bsDoRecord;
+    pRecord->Serialize(bsDoRecord);
+    m_Param.pEventSink->On_AddDoRecord(this, bsDoRecord);
+    pRecord->Release();
+  }
+  m_ChangeInfo.nChangeType = FDE_TXTEDT_TEXTCHANGE_TYPE_Delete;
+  GetText(m_ChangeInfo.wsDelete, nStart, nCount);
+  Inner_DeleteRange(nStart, nCount);
+  SetCaretPos(nStart + ((!bBackspace && nStart > 0) ? -1 : 0),
+              (bBackspace || nStart == 0));
+  m_Param.pEventSink->On_TextChanged(this, m_ChangeInfo);
+  return FDE_TXTEDT_MODIFY_RET_S_Normal;
+}
+int32_t CFDE_TxtEdtEngine::DeleteRange(int32_t nStart, int32_t nCount) {
+  if (IsLocked()) {
+    return FDE_TXTEDT_MODIFY_RET_F_Locked;
+  }
+  if (nCount == -1) {
+    nCount = GetTextBufLength();
+  }
+  if (nCount == 0) {
+    return FDE_TXTEDT_MODIFY_RET_S_Normal;
+  }
+  if (m_Param.dwMode & FDE_TEXTEDITMODE_Validate) {
+    CFX_WideString wsText;
+    GetPreDeleteText(wsText, nStart, nCount);
+    if (!m_Param.pEventSink->On_Validate(this, wsText)) {
+      return FDE_TXTEDT_MODIFY_RET_F_Invalidate;
+    }
+  }
+  DeleteRange_DoRecord(nStart, nCount);
+  m_Param.pEventSink->On_TextChanged(this, m_ChangeInfo);
+  SetCaretPos(nStart, TRUE);
+  return FDE_TXTEDT_MODIFY_RET_S_Normal;
+}
+int32_t CFDE_TxtEdtEngine::Replace(int32_t nStart,
+                                   int32_t nLength,
+                                   const CFX_WideString& wsReplace) {
+  if (IsLocked()) {
+    return FDE_TXTEDT_MODIFY_RET_F_Locked;
+  }
+  if (nStart < 0 || (nStart + nLength > GetTextBufLength())) {
+    return FDE_TXTEDT_MODIFY_RET_F_Boundary;
+  }
+  if (m_Param.dwMode & FDE_TEXTEDITMODE_Validate) {
+    CFX_WideString wsText;
+    GetPreReplaceText(wsText, nStart, nLength, wsReplace.c_str(),
+                      wsReplace.GetLength());
+    if (!m_Param.pEventSink->On_Validate(this, wsText)) {
+      return FDE_TXTEDT_MODIFY_RET_F_Invalidate;
+    }
+  }
+  if (IsSelect()) {
+    ClearSelection();
+  }
+  m_ChangeInfo.nChangeType = FDE_TXTEDT_TEXTCHANGE_TYPE_Replace;
+  GetText(m_ChangeInfo.wsDelete, nStart, nLength);
+  if (nLength > 0) {
+    Inner_DeleteRange(nStart, nLength);
+  }
+  int32_t nTextLength = wsReplace.GetLength();
+  if (nTextLength > 0) {
+    Inner_Insert(nStart, wsReplace.c_str(), nTextLength);
+  }
+  m_ChangeInfo.wsInsert = CFX_WideString(wsReplace.c_str(), nTextLength);
+  nStart += nTextLength;
+  FX_WCHAR wChar = m_pTxtBuf->GetCharByIndex(nStart - 1);
+  FX_BOOL bBefore = TRUE;
+  if (wChar != L'\n' && wChar != L'\r') {
+    nStart--;
+    bBefore = FALSE;
+  }
+  SetCaretPos(nStart, bBefore);
+  m_Param.pEventSink->On_PageUnload(this, m_nCaretPage, 0);
+  m_Param.pEventSink->On_PageLoad(this, m_nCaretPage, 0);
+  m_Param.pEventSink->On_TextChanged(this, m_ChangeInfo);
+  return FDE_TXTEDT_MODIFY_RET_S_Normal;
+}
+void CFDE_TxtEdtEngine::SetLimit(int32_t nLimit) {
+  m_nLimit = nLimit;
+}
+void CFDE_TxtEdtEngine::SetAliasChar(FX_WCHAR wcAlias) {
+  m_wcAliasChar = wcAlias;
+}
+
+void CFDE_TxtEdtEngine::RemoveSelRange(int32_t nStart, int32_t nCount) {
+  FDE_LPTXTEDTSELRANGE lpTemp = NULL;
+  int32_t nRangeCount = m_SelRangePtrArr.GetSize();
+  int32_t i = 0;
+  for (i = 0; i < nRangeCount; i++) {
+    lpTemp = m_SelRangePtrArr[i];
+    if (lpTemp->nStart == nStart && lpTemp->nCount == nCount) {
+      delete lpTemp;
+      m_SelRangePtrArr.RemoveAt(i);
+      return;
+    }
+  }
+}
+
+void CFDE_TxtEdtEngine::AddSelRange(int32_t nStart, int32_t nCount) {
+  if (nCount == -1) {
+    nCount = GetTextLength() - nStart;
+  }
+  int32_t nSize = m_SelRangePtrArr.GetSize();
+  if (nSize <= 0) {
+    FDE_LPTXTEDTSELRANGE lpSelRange = new FDE_TXTEDTSELRANGE;
+    lpSelRange->nStart = nStart;
+    lpSelRange->nCount = nCount;
+    m_SelRangePtrArr.Add(lpSelRange);
+    m_Param.pEventSink->On_SelChanged(this);
+    return;
+  }
+  FDE_LPTXTEDTSELRANGE lpTemp = NULL;
+  lpTemp = m_SelRangePtrArr[nSize - 1];
+  if (nStart >= lpTemp->nStart + lpTemp->nCount) {
+    FDE_LPTXTEDTSELRANGE lpSelRange = new FDE_TXTEDTSELRANGE;
+    lpSelRange->nStart = nStart;
+    lpSelRange->nCount = nCount;
+    m_SelRangePtrArr.Add(lpSelRange);
+    m_Param.pEventSink->On_SelChanged(this);
+    return;
+  }
+  int32_t nEnd = nStart + nCount - 1;
+  FX_BOOL bBegin = FALSE;
+  int32_t nRangeBgn = 0;
+  int32_t nRangeCnt = 0;
+  for (int32_t i = 0; i < nSize; i++) {
+    lpTemp = m_SelRangePtrArr[i];
+    int32_t nTempBgn = lpTemp->nStart;
+    int32_t nTempEnd = nTempBgn + lpTemp->nCount - 1;
+    if (bBegin) {
+      if (nEnd < nTempBgn) {
+        break;
+      } else if (nStart >= nTempBgn && nStart <= nTempEnd) {
+        nRangeCnt++;
+        break;
+      }
+      nRangeCnt++;
+    } else {
+      if (nStart <= nTempEnd) {
+        nRangeBgn = i;
+        if (nEnd < nTempBgn) {
+          break;
+        }
+        nRangeCnt = 1;
+        bBegin = TRUE;
+      }
+    }
+  }
+  if (nRangeCnt == 0) {
+    FDE_LPTXTEDTSELRANGE lpSelRange = new FDE_TXTEDTSELRANGE;
+    lpSelRange->nStart = nStart;
+    lpSelRange->nCount = nCount;
+    m_SelRangePtrArr.InsertAt(nRangeBgn, lpSelRange);
+  } else {
+    lpTemp = m_SelRangePtrArr[nRangeBgn];
+    lpTemp->nStart = nStart;
+    lpTemp->nCount = nCount;
+    nRangeCnt--;
+    nRangeBgn++;
+    while (nRangeCnt--) {
+      delete m_SelRangePtrArr[nRangeBgn];
+      m_SelRangePtrArr.RemoveAt(nRangeBgn);
+    }
+  }
+  m_Param.pEventSink->On_SelChanged(this);
+}
+
+int32_t CFDE_TxtEdtEngine::CountSelRanges() {
+  return m_SelRangePtrArr.GetSize();
+}
+int32_t CFDE_TxtEdtEngine::GetSelRange(int32_t nIndex, int32_t& nStart) {
+  nStart = m_SelRangePtrArr[nIndex]->nStart;
+  return m_SelRangePtrArr[nIndex]->nCount;
+}
+void CFDE_TxtEdtEngine::ClearSelection() {
+  int32_t nCount = m_SelRangePtrArr.GetSize();
+  FDE_LPTXTEDTSELRANGE lpRange = NULL;
+  int32_t i = 0;
+  for (i = 0; i < nCount; i++) {
+    lpRange = m_SelRangePtrArr[i];
+    if (lpRange != NULL) {
+      delete lpRange;
+      lpRange = NULL;
+    }
+  }
+  m_SelRangePtrArr.RemoveAll();
+  if (nCount && m_Param.pEventSink) {
+    m_Param.pEventSink->On_SelChanged(this);
+  }
+}
+FX_BOOL CFDE_TxtEdtEngine::Redo(const CFX_ByteStringC& bsRedo) {
+  if (IsLocked()) {
+    return FALSE;
+  }
+  if (m_Param.dwMode & FDE_TEXTEDITMODE_NoRedoUndo) {
+    return FALSE;
+  }
+  IFDE_TxtEdtDoRecord* pDoRecord = IFDE_TxtEdtDoRecord::Create(bsRedo);
+  FXSYS_assert(pDoRecord);
+  if (pDoRecord == NULL) {
+    return FALSE;
+  }
+  FX_BOOL bOK = pDoRecord->Redo();
+  pDoRecord->Release();
+  return bOK;
+}
+FX_BOOL CFDE_TxtEdtEngine::Undo(const CFX_ByteStringC& bsUndo) {
+  if (IsLocked()) {
+    return FALSE;
+  }
+  if (m_Param.dwMode & FDE_TEXTEDITMODE_NoRedoUndo) {
+    return FALSE;
+  }
+  IFDE_TxtEdtDoRecord* pDoRecord = IFDE_TxtEdtDoRecord::Create(bsUndo);
+  FXSYS_assert(pDoRecord);
+  if (pDoRecord == NULL) {
+    return FALSE;
+  }
+  FX_BOOL bOK = pDoRecord->Undo();
+  pDoRecord->Release();
+  return bOK;
+}
+int32_t CFDE_TxtEdtEngine::StartLayout() {
+  Lock();
+  RemoveAllPages();
+  m_nLayoutPos = 0;
+  m_nLineCount = 0;
+  return 0;
+}
+int32_t CFDE_TxtEdtEngine::DoLayout(IFX_Pause* pPause) {
+  int32_t nCount = m_ParagPtrArray.GetSize();
+  CFDE_TxtEdtParag* pParag = NULL;
+  int32_t nLineCount = 0;
+  for (; m_nLayoutPos < nCount; m_nLayoutPos++) {
+    pParag = m_ParagPtrArray[m_nLayoutPos];
+    pParag->CalcLines();
+    nLineCount += pParag->m_nLineCount;
+    if ((pPause != NULL) && (nLineCount > m_nPageLineCount) &&
+        pPause->NeedToPauseNow()) {
+      m_nLineCount += nLineCount;
+      return (++m_nLayoutPos * 100) / nCount;
+    }
+  }
+  m_nLineCount += nLineCount;
+  return 100;
+}
+void CFDE_TxtEdtEngine::EndLayout() {
+  UpdatePages();
+  int32_t nLength = GetTextLength();
+  if (m_nCaret > nLength) {
+    m_nCaret = nLength;
+  }
+  int32_t nIndex = m_nCaret;
+  if (!m_bBefore) {
+    nIndex--;
+  }
+  m_rtCaret.Set(0, 0, 1, m_Param.fFontSize);
+  Unlock();
+}
+FX_BOOL CFDE_TxtEdtEngine::Optimize(IFX_Pause* pPause) {
+  return m_pTxtBuf->Optimize(pPause);
+}
+IFDE_TxtEdtBuf* CFDE_TxtEdtEngine::GetTextBuf() const {
+  return (IFDE_TxtEdtBuf*)m_pTxtBuf;
+}
+int32_t CFDE_TxtEdtEngine::GetTextBufLength() const {
+  return m_pTxtBuf->GetTextLength() - 1;
+}
+IFX_TxtBreak* CFDE_TxtEdtEngine::GetTextBreak() const {
+  return m_pTextBreak;
+}
+int32_t CFDE_TxtEdtEngine::GetLineCount() const {
+  return m_nLineCount;
+}
+int32_t CFDE_TxtEdtEngine::GetPageLineCount() const {
+  return m_nPageLineCount;
+}
+int32_t CFDE_TxtEdtEngine::CountParags() const {
+  return m_ParagPtrArray.GetSize();
+}
+IFDE_TxtEdtParag* CFDE_TxtEdtEngine::GetParag(int32_t nParagIndex) const {
+  return m_ParagPtrArray[nParagIndex];
+}
+IFX_CharIter* CFDE_TxtEdtEngine::CreateCharIter() {
+  if (!m_pTxtBuf) {
+    return NULL;
+  }
+  return new CFDE_TxtEdtBufIter((CFDE_TxtEdtBuf*)m_pTxtBuf);
+}
+int32_t CFDE_TxtEdtEngine::Line2Parag(int32_t nStartParag,
+                                      int32_t nStartLineofParag,
+                                      int32_t nLineIndex,
+                                      int32_t& nStartLine) const {
+  int32_t nLineTotal = nStartLineofParag;
+  int32_t nCount = m_ParagPtrArray.GetSize();
+  CFDE_TxtEdtParag* pParag = NULL;
+  int32_t i = nStartParag;
+  for (; i < nCount; i++) {
+    pParag = m_ParagPtrArray[i];
+    nLineTotal += pParag->m_nLineCount;
+    if (nLineTotal > nLineIndex) {
+      break;
+    }
+  }
+  nStartLine = nLineTotal - pParag->m_nLineCount;
+  return i;
+}
+void CFDE_TxtEdtEngine::GetPreDeleteText(CFX_WideString& wsText,
+                                         int32_t nIndex,
+                                         int32_t nLength) {
+  GetText(wsText, 0, GetTextBufLength());
+  wsText.Delete(nIndex, nLength);
+}
+void CFDE_TxtEdtEngine::GetPreInsertText(CFX_WideString& wsText,
+                                         int32_t nIndex,
+                                         const FX_WCHAR* lpText,
+                                         int32_t nLength) {
+  GetText(wsText, 0, GetTextBufLength());
+  int32_t nSelIndex = 0;
+  int32_t nSelLength = 0;
+  int32_t nSelCount = CountSelRanges();
+  while (nSelCount--) {
+    nSelLength = GetSelRange(nSelCount, nSelIndex);
+    wsText.Delete(nSelIndex, nSelLength);
+    nIndex = nSelIndex;
+  }
+  CFX_WideString wsTemp;
+  int32_t nOldLength = wsText.GetLength();
+  const FX_WCHAR* pOldBuffer = wsText.c_str();
+  FX_WCHAR* lpBuffer = wsTemp.GetBuffer(nOldLength + nLength);
+  FXSYS_memcpy(lpBuffer, pOldBuffer, (nIndex) * sizeof(FX_WCHAR));
+  FXSYS_memcpy(lpBuffer + nIndex, lpText, nLength * sizeof(FX_WCHAR));
+  FXSYS_memcpy(lpBuffer + nIndex + nLength, pOldBuffer + nIndex,
+               (nOldLength - nIndex) * sizeof(FX_WCHAR));
+  wsTemp.ReleaseBuffer(nOldLength + nLength);
+  wsText = wsTemp;
+}
+void CFDE_TxtEdtEngine::GetPreReplaceText(CFX_WideString& wsText,
+                                          int32_t nIndex,
+                                          int32_t nOriginLength,
+                                          const FX_WCHAR* lpText,
+                                          int32_t nLength) {
+  GetText(wsText, 0, GetTextBufLength());
+  int32_t nSelIndex = 0;
+  int32_t nSelLength = 0;
+  int32_t nSelCount = CountSelRanges();
+  while (nSelCount--) {
+    nSelLength = GetSelRange(nSelCount, nSelIndex);
+    wsText.Delete(nSelIndex, nSelLength);
+  }
+  wsText.Delete(nIndex, nOriginLength);
+  int32_t i = 0;
+  for (i = 0; i < nLength; i++) {
+    wsText.Insert(nIndex++, lpText[i]);
+  }
+}
+void CFDE_TxtEdtEngine::Inner_Insert(int32_t nStart,
+                                     const FX_WCHAR* lpText,
+                                     int32_t nLength) {
+  FXSYS_assert(nLength > 0);
+  FDE_TXTEDTPARAGPOS ParagPos;
+  TextPos2ParagPos(nStart, ParagPos);
+  m_Param.pEventSink->On_PageUnload(this, m_nCaretPage, 0);
+  int32_t nParagCount = m_ParagPtrArray.GetSize();
+  int32_t i = 0;
+  for (i = ParagPos.nParagIndex + 1; i < nParagCount; i++) {
+    m_ParagPtrArray[i]->m_nCharStart += nLength;
+  }
+  CFDE_TxtEdtParag* pParag = m_ParagPtrArray[ParagPos.nParagIndex];
+  int32_t nReserveLineCount = pParag->m_nLineCount;
+  int32_t nReserveCharStart = pParag->m_nCharStart;
+  int32_t nLeavePart = ParagPos.nCharIndex;
+  int32_t nCutPart = pParag->m_nCharCount - ParagPos.nCharIndex;
+  int32_t nTextStart = 0;
+  FX_WCHAR wCurChar = L' ';
+  const FX_WCHAR* lpPos = lpText;
+  FX_BOOL bFirst = TRUE;
+  int32_t nParagIndex = ParagPos.nParagIndex;
+  for (i = 0; i < nLength; i++, lpPos++) {
+    wCurChar = *lpPos;
+    if (wCurChar == m_wLineEnd) {
+      if (bFirst) {
+        pParag->m_nCharCount = nLeavePart + (i - nTextStart + 1);
+        pParag->m_nLineCount = -1;
+        nReserveCharStart += pParag->m_nCharCount;
+        bFirst = FALSE;
+      } else {
+        pParag = new CFDE_TxtEdtParag(this);
+        pParag->m_nLineCount = -1;
+        pParag->m_nCharCount = i - nTextStart + 1;
+        pParag->m_nCharStart = nReserveCharStart;
+        m_ParagPtrArray.InsertAt(++nParagIndex, pParag);
+        nReserveCharStart += pParag->m_nCharCount;
+      }
+      nTextStart = i + 1;
+    }
+  }
+  if (bFirst) {
+    pParag->m_nCharCount += nLength;
+    pParag->m_nLineCount = -1;
+    bFirst = FALSE;
+  } else {
+    pParag = new CFDE_TxtEdtParag(this);
+    pParag->m_nLineCount = -1;
+    pParag->m_nCharCount = nLength - nTextStart + nCutPart;
+    pParag->m_nCharStart = nReserveCharStart;
+    m_ParagPtrArray.InsertAt(++nParagIndex, pParag);
+  }
+  m_pTxtBuf->Insert(nStart, lpText, nLength);
+  int32_t nTotalLineCount = 0;
+  for (i = ParagPos.nParagIndex; i <= nParagIndex; i++) {
+    pParag = m_ParagPtrArray[i];
+    pParag->CalcLines();
+    nTotalLineCount += pParag->m_nLineCount;
+  }
+  m_nLineCount += nTotalLineCount - nReserveLineCount;
+  m_Param.pEventSink->On_PageLoad(this, m_nCaretPage, 0);
+  UpdatePages();
+}
+
+void CFDE_TxtEdtEngine::Inner_DeleteRange(int32_t nStart, int32_t nCount) {
+  if (nCount == -1) {
+    nCount = m_pTxtBuf->GetTextLength() - nStart;
+  }
+  int32_t nEnd = nStart + nCount - 1;
+  FXSYS_assert(nStart >= 0 && nEnd < m_pTxtBuf->GetTextLength());
+  m_Param.pEventSink->On_PageUnload(this, m_nCaretPage, 0);
+  FDE_TXTEDTPARAGPOS ParagPosBgn, ParagPosEnd;
+  TextPos2ParagPos(nStart, ParagPosBgn);
+  TextPos2ParagPos(nEnd, ParagPosEnd);
+  CFDE_TxtEdtParag* pParag = m_ParagPtrArray[ParagPosEnd.nParagIndex];
+  FX_BOOL bLastParag = FALSE;
+  if (ParagPosEnd.nCharIndex == pParag->m_nCharCount - 1) {
+    if (ParagPosEnd.nParagIndex < m_ParagPtrArray.GetSize() - 1) {
+      ParagPosEnd.nParagIndex++;
+    } else {
+      bLastParag = TRUE;
+    }
+  }
+  int32_t nTotalLineCount = 0;
+  int32_t nTotalCharCount = 0;
+  int32_t i = 0;
+  for (i = ParagPosBgn.nParagIndex; i <= ParagPosEnd.nParagIndex; i++) {
+    CFDE_TxtEdtParag* pParag = m_ParagPtrArray[i];
+    pParag->CalcLines();
+    nTotalLineCount += pParag->m_nLineCount;
+    nTotalCharCount += pParag->m_nCharCount;
+  }
+  m_pTxtBuf->Delete(nStart, nCount);
+  int32_t nNextParagIndex = (ParagPosBgn.nCharIndex == 0 && bLastParag)
+                                ? ParagPosBgn.nParagIndex
+                                : (ParagPosBgn.nParagIndex + 1);
+  for (i = nNextParagIndex; i <= ParagPosEnd.nParagIndex; i++) {
+    CFDE_TxtEdtParag* pParag = m_ParagPtrArray[nNextParagIndex];
+    delete pParag;
+    m_ParagPtrArray.RemoveAt(nNextParagIndex);
+  }
+  if (!(bLastParag && ParagPosBgn.nCharIndex == 0)) {
+    pParag = m_ParagPtrArray[ParagPosBgn.nParagIndex];
+    pParag->m_nCharCount = nTotalCharCount - nCount;
+    pParag->CalcLines();
+    nTotalLineCount -= pParag->m_nLineCount;
+  }
+  int32_t nParagCount = m_ParagPtrArray.GetSize();
+  for (i = nNextParagIndex; i < nParagCount; i++) {
+    m_ParagPtrArray[i]->m_nCharStart -= nCount;
+  }
+  m_nLineCount -= nTotalLineCount;
+  UpdatePages();
+  int32_t nPageCount = CountPages();
+  if (m_nCaretPage >= nPageCount) {
+    m_nCaretPage = nPageCount - 1;
+  }
+  m_Param.pEventSink->On_PageLoad(this, m_nCaretPage, 0);
+}
+void CFDE_TxtEdtEngine::DeleteRange_DoRecord(int32_t nStart,
+                                             int32_t nCount,
+                                             FX_BOOL bSel) {
+  FXSYS_assert(nStart >= 0);
+  if (nCount == -1) {
+    nCount = GetTextLength() - nStart;
+  }
+  FXSYS_assert((nStart + nCount) <= m_pTxtBuf->GetTextLength());
+
+  if (!(m_Param.dwMode & FDE_TEXTEDITMODE_NoRedoUndo)) {
+    CFX_WideString wsRange;
+    m_pTxtBuf->GetRange(wsRange, nStart, nCount);
+    IFDE_TxtEdtDoRecord* pRecord = new CFDE_TxtEdtDoRecord_DeleteRange(
+        this, nStart, m_nCaret, wsRange, bSel);
+    CFX_ByteString bsDoRecord;
+    pRecord->Serialize(bsDoRecord);
+    m_Param.pEventSink->On_AddDoRecord(this, bsDoRecord);
+    pRecord->Release();
+  }
+  m_ChangeInfo.nChangeType = FDE_TXTEDT_TEXTCHANGE_TYPE_Delete;
+  GetText(m_ChangeInfo.wsDelete, nStart, nCount);
+  Inner_DeleteRange(nStart, nCount);
+}
+void CFDE_TxtEdtEngine::ResetEngine() {
+  RemoveAllPages();
+  RemoveAllParags();
+  ClearSelection();
+  m_nCaret = 0;
+  m_pTxtBuf->Clear(FALSE);
+  m_nCaret = 0;
+}
+void CFDE_TxtEdtEngine::RebuildParagraphs() {
+  RemoveAllParags();
+  FX_WCHAR wChar = L' ';
+  int32_t nParagStart = 0;
+  int32_t nIndex = 0;
+  IFX_CharIter* pIter = new CFDE_TxtEdtBufIter((CFDE_TxtEdtBuf*)m_pTxtBuf);
+  pIter->SetAt(0);
+  do {
+    wChar = pIter->GetChar();
+    nIndex = pIter->GetAt();
+    if (wChar == m_wLineEnd) {
+      CFDE_TxtEdtParag* pParag = new CFDE_TxtEdtParag(this);
+      pParag->m_nCharStart = nParagStart;
+      pParag->m_nCharCount = nIndex - nParagStart + 1;
+      pParag->m_nLineCount = -1;
+      m_ParagPtrArray.Add(pParag);
+      nParagStart = nIndex + 1;
+    }
+  } while (pIter->Next());
+  pIter->Release();
+}
+void CFDE_TxtEdtEngine::RemoveAllParags() {
+  int32_t nCount = m_ParagPtrArray.GetSize();
+  int32_t i = 0;
+  for (i = 0; i < nCount; i++) {
+    CFDE_TxtEdtParag* pParag = m_ParagPtrArray[i];
+    if (pParag) {
+      delete pParag;
+    }
+  }
+  m_ParagPtrArray.RemoveAll();
+}
+void CFDE_TxtEdtEngine::RemoveAllPages() {
+  int32_t nCount = m_PagePtrArray.GetSize();
+  int32_t i = 0;
+  for (i = 0; i < nCount; i++) {
+    IFDE_TxtEdtPage* pPage = m_PagePtrArray[i];
+    if (pPage) {
+      pPage->Release();
+    }
+  }
+  m_PagePtrArray.RemoveAll();
+}
+void CFDE_TxtEdtEngine::UpdateParags() {
+  int32_t nCount = m_ParagPtrArray.GetSize();
+  if (nCount == 0) {
+    return;
+  }
+  CFDE_TxtEdtParag* pParag = NULL;
+  int32_t nLineCount = 0;
+  int32_t i = 0;
+  for (i = 0; i < nCount; i++) {
+    pParag = m_ParagPtrArray[i];
+    if (pParag->m_nLineCount == -1) {
+      pParag->CalcLines();
+    }
+    nLineCount += pParag->m_nLineCount;
+  }
+  m_nLineCount = nLineCount;
+}
+void CFDE_TxtEdtEngine::UpdatePages() {
+  if (m_nLineCount == 0) {
+    return;
+  }
+  int32_t nPageCount = (m_nLineCount - 1) / (m_nPageLineCount) + 1;
+  int32_t nSize = m_PagePtrArray.GetSize();
+  if (nSize == nPageCount) {
+    return;
+  }
+  if (nSize > nPageCount) {
+    IFDE_TxtEdtPage* pPage = NULL;
+    int32_t i = 0;
+    for (i = nSize - 1; i >= nPageCount; i--) {
+      pPage = m_PagePtrArray[i];
+      if (pPage) {
+        pPage->Release();
+      }
+      m_PagePtrArray.RemoveAt(i);
+    }
+    m_Param.pEventSink->On_PageCountChanged(this);
+    return;
+  }
+  if (nSize < nPageCount) {
+    IFDE_TxtEdtPage* pPage = NULL;
+    int32_t i = 0;
+    for (i = nSize; i < nPageCount; i++) {
+      pPage = IFDE_TxtEdtPage::Create(this, i);
+      m_PagePtrArray.Add(pPage);
+    }
+    m_Param.pEventSink->On_PageCountChanged(this);
+    return;
+  }
+}
+void CFDE_TxtEdtEngine::UpdateTxtBreak() {
+  FX_DWORD dwStyle = m_pTextBreak->GetLayoutStyles();
+  if (m_Param.dwMode & FDE_TEXTEDITMODE_MultiLines) {
+    dwStyle &= ~FX_TXTLAYOUTSTYLE_SingleLine;
+  } else {
+    dwStyle |= FX_TXTLAYOUTSTYLE_SingleLine;
+  }
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_DocVertical) {
+    dwStyle |= FX_TXTLAYOUTSTYLE_VerticalLayout;
+  } else {
+    dwStyle &= ~FX_TXTLAYOUTSTYLE_VerticalLayout;
+  }
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_LineReserve) {
+    dwStyle |= FX_TXTLAYOUTSTYLE_ReverseLine;
+  } else {
+    dwStyle &= ~FX_TXTLAYOUTSTYLE_ReverseLine;
+  }
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_RTL) {
+    dwStyle |= FX_TXTLAYOUTSTYLE_RTLReadingOrder;
+  } else {
+    dwStyle &= ~FX_TXTLAYOUTSTYLE_RTLReadingOrder;
+  }
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_CombText) {
+    dwStyle |= FX_TXTLAYOUTSTYLE_CombText;
+  } else {
+    dwStyle &= ~FX_TXTLAYOUTSTYLE_CombText;
+  }
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_CharVertial) {
+    dwStyle |= FX_TXTLAYOUTSTYLE_VerticalChars;
+  } else {
+    dwStyle &= ~FX_TXTLAYOUTSTYLE_VerticalChars;
+  }
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_ExpandTab) {
+    dwStyle |= FX_TXTLAYOUTSTYLE_ExpandTab;
+  } else {
+    dwStyle &= ~FX_TXTLAYOUTSTYLE_ExpandTab;
+  }
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_ArabicContext) {
+    dwStyle |= FX_TXTLAYOUTSTYLE_ArabicContext;
+  } else {
+    dwStyle &= ~FX_TXTLAYOUTSTYLE_ArabicContext;
+  }
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_ArabicShapes) {
+    dwStyle |= FX_TXTLAYOUTSTYLE_ArabicShapes;
+  } else {
+    dwStyle &= ~FX_TXTLAYOUTSTYLE_ArabicShapes;
+  }
+  m_pTextBreak->SetLayoutStyles(dwStyle);
+  FX_DWORD dwAligment = 0;
+  if (m_Param.dwAlignment & FDE_TEXTEDITALIGN_Justified) {
+    dwAligment |= FX_TXTLINEALIGNMENT_Justified;
+  } else if (m_Param.dwAlignment & FDE_TEXTEDITALIGN_Distributed) {
+    dwAligment |= FX_TXTLINEALIGNMENT_Distributed;
+  }
+  if (m_Param.dwAlignment & FDE_TEXTEDITALIGN_Center) {
+    dwAligment |= FX_TXTLINEALIGNMENT_Center;
+  } else if (m_Param.dwAlignment & FDE_TEXTEDITALIGN_Right) {
+    dwAligment |= FX_TXTLINEALIGNMENT_Right;
+  }
+  m_pTextBreak->SetAlignment(dwAligment);
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_DocVertical) {
+    if (m_Param.dwMode & FDE_TEXTEDITMODE_AutoLineWrap) {
+      m_pTextBreak->SetLineWidth(m_Param.fPlateHeight);
+    } else {
+      m_pTextBreak->SetLineWidth(FDE_PAGEWIDTH_MAX);
+    }
+  } else {
+    if (m_Param.dwMode & FDE_TEXTEDITMODE_AutoLineWrap) {
+      m_pTextBreak->SetLineWidth(m_Param.fPlateWidth);
+    } else {
+      m_pTextBreak->SetLineWidth(FDE_PAGEWIDTH_MAX);
+    }
+  }
+  m_nPageLineCount = m_Param.nLineCount;
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_CombText) {
+    FX_FLOAT fCombWidth =
+        m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_DocVertical
+            ? m_Param.fPlateHeight
+            : m_Param.fPlateWidth;
+    if (m_nLimit > 0) {
+      fCombWidth /= m_nLimit;
+    }
+    m_pTextBreak->SetCombWidth(fCombWidth);
+  }
+  m_pTextBreak->SetFont(m_Param.pFont);
+  m_pTextBreak->SetFontSize(m_Param.fFontSize);
+  m_pTextBreak->SetTabWidth(m_Param.fTabWidth, m_Param.bTabEquidistant);
+  m_pTextBreak->SetDefaultChar(m_Param.wDefChar);
+  m_pTextBreak->SetParagraphBreakChar(m_Param.wLineBreakChar);
+  m_pTextBreak->SetCharRotation(m_Param.nCharRotation);
+  m_pTextBreak->SetLineBreakTolerance(m_Param.fFontSize * 0.2f);
+  m_pTextBreak->SetHorizontalScale(m_Param.nHorzScale);
+  m_pTextBreak->SetCharSpace(m_Param.fCharSpace);
+}
+FX_BOOL CFDE_TxtEdtEngine::ReplaceParagEnd(FX_WCHAR*& lpText,
+                                           int32_t& nLength,
+                                           FX_BOOL bPreIsCR) {
+  for (int32_t i = 0; i < nLength; i++) {
+    FX_WCHAR wc = lpText[i];
+    switch (wc) {
+      case L'\r': {
+        lpText[i] = m_wLineEnd;
+        bPreIsCR = TRUE;
+      } break;
+      case L'\n': {
+        if (bPreIsCR == TRUE) {
+          int32_t nNext = i + 1;
+          if (nNext < nLength) {
+            FXSYS_memmove(lpText + i, lpText + nNext,
+                          (nLength - nNext) * sizeof(FX_WCHAR));
+          }
+          i--;
+          nLength--;
+          bPreIsCR = FALSE;
+          if (m_bAutoLineEnd) {
+            m_nFirstLineEnd = FDE_TXTEDIT_LINEEND_CRLF;
+            m_bAutoLineEnd = FALSE;
+          }
+        } else {
+          lpText[i] = m_wLineEnd;
+          if (m_bAutoLineEnd) {
+            m_nFirstLineEnd = FDE_TXTEDIT_LINEEND_LF;
+            m_bAutoLineEnd = FALSE;
+          }
+        }
+      } break;
+      default: {
+        if (bPreIsCR && m_bAutoLineEnd) {
+          m_nFirstLineEnd = FDE_TXTEDIT_LINEEND_CR;
+          m_bAutoLineEnd = FALSE;
+        }
+        bPreIsCR = FALSE;
+      } break;
+    }
+  }
+  return bPreIsCR;
+}
+void CFDE_TxtEdtEngine::RecoverParagEnd(CFX_WideString& wsText) {
+  FX_WCHAR wc = (m_nFirstLineEnd == FDE_TXTEDIT_LINEEND_CR) ? L'\n' : L'\r';
+  if (m_nFirstLineEnd == FDE_TXTEDIT_LINEEND_CRLF) {
+    CFX_ArrayTemplate<int32_t> PosArr;
+    int32_t nLength = wsText.GetLength();
+    int32_t i = 0;
+    FX_WCHAR* lpPos = (FX_WCHAR*)(const FX_WCHAR*)wsText;
+    for (i = 0; i < nLength; i++, lpPos++) {
+      if (*lpPos == m_wLineEnd) {
+        *lpPos = wc;
+        PosArr.Add(i);
+      }
+    }
+    const FX_WCHAR* lpSrcBuf = wsText.c_str();
+    CFX_WideString wsTemp;
+    int32_t nCount = PosArr.GetSize();
+    FX_WCHAR* lpDstBuf = wsTemp.GetBuffer(nLength + nCount);
+    int32_t nDstPos = 0;
+    int32_t nSrcPos = 0;
+    for (i = 0; i < nCount; i++) {
+      int32_t nPos = PosArr[i];
+      int32_t nCopyLen = nPos - nSrcPos + 1;
+      FXSYS_memcpy(lpDstBuf + nDstPos, lpSrcBuf + nSrcPos,
+                   nCopyLen * sizeof(FX_WCHAR));
+      nDstPos += nCopyLen;
+      nSrcPos += nCopyLen;
+      lpDstBuf[nDstPos] = L'\n';
+      nDstPos++;
+    }
+    if (nSrcPos < nLength) {
+      FXSYS_memcpy(lpDstBuf + nDstPos, lpSrcBuf + nSrcPos,
+                   (nLength - nSrcPos) * sizeof(FX_WCHAR));
+    }
+    wsTemp.ReleaseBuffer(nLength + nCount);
+    wsText = wsTemp;
+  } else {
+    int32_t nLength = wsText.GetLength();
+    FX_WCHAR* lpBuf = (FX_WCHAR*)(const FX_WCHAR*)wsText;
+    for (int32_t i = 0; i < nLength; i++, lpBuf++) {
+      if (*lpBuf == m_wLineEnd) {
+        *lpBuf = wc;
+      }
+    }
+  }
+}
+int32_t CFDE_TxtEdtEngine::MovePage2Char(int32_t nIndex) {
+  FXSYS_assert(nIndex >= 0);
+  FXSYS_assert(nIndex <= m_pTxtBuf->GetTextLength());
+  if (m_nCaretPage >= 0) {
+    IFDE_TxtEdtPage* pPage = m_PagePtrArray[m_nCaretPage];
+    m_Param.pEventSink->On_PageLoad(this, m_nCaretPage, 0);
+    int32_t nPageCharStart = pPage->GetCharStart();
+    int32_t nPageCharCount = pPage->GetCharCount();
+    if (nIndex >= nPageCharStart && nIndex < nPageCharStart + nPageCharCount) {
+      m_Param.pEventSink->On_PageUnload(this, m_nCaretPage, 0);
+      return m_nCaretPage;
+    }
+    m_Param.pEventSink->On_PageUnload(this, m_nCaretPage, 0);
+  }
+  CFDE_TxtEdtParag* pParag = NULL;
+  int32_t nLineCount = 0;
+  int32_t nParagCount = m_ParagPtrArray.GetSize();
+  int32_t i = 0;
+  for (i = 0; i < nParagCount; i++) {
+    pParag = m_ParagPtrArray[i];
+    if (pParag->m_nCharStart <= nIndex &&
+        nIndex < (pParag->m_nCharStart + pParag->m_nCharCount)) {
+      break;
+    }
+    nLineCount += pParag->m_nLineCount;
+  }
+  pParag->LoadParag();
+  int32_t nLineStart = -1;
+  int32_t nLineCharCount = -1;
+  for (i = 0; i < pParag->m_nLineCount; i++) {
+    pParag->GetLineRange(i, nLineStart, nLineCharCount);
+    if (nLineStart <= nIndex && nIndex < (nLineStart + nLineCharCount)) {
+      break;
+    }
+  }
+  FXSYS_assert(i < pParag->m_nLineCount);
+  nLineCount += (i + 1);
+  m_nCaretPage = (nLineCount - 1) / m_nPageLineCount + 1 - 1;
+  m_Param.pEventSink->On_PageChange(this, m_nCaretPage);
+  pParag->UnloadParag();
+  return m_nCaretPage;
+}
+void CFDE_TxtEdtEngine::TextPos2ParagPos(int32_t nIndex,
+                                         FDE_TXTEDTPARAGPOS& ParagPos) const {
+  FXSYS_assert(nIndex >= 0 && nIndex < m_pTxtBuf->GetTextLength());
+  int32_t nCount = m_ParagPtrArray.GetSize();
+  int32_t nBgn = 0;
+  int32_t nMid = 0;
+  int32_t nEnd = nCount - 1;
+  while (nEnd > nBgn) {
+    nMid = (nBgn + nEnd) / 2;
+    CFDE_TxtEdtParag* pParag = m_ParagPtrArray[nMid];
+    if (nIndex < pParag->m_nCharStart) {
+      nEnd = nMid - 1;
+    } else if (nIndex >= (pParag->m_nCharStart + pParag->m_nCharCount)) {
+      nBgn = nMid + 1;
+    } else {
+      break;
+    }
+  }
+  if (nBgn == nEnd) {
+    nMid = nBgn;
+  }
+  FXSYS_assert(nIndex >= m_ParagPtrArray[nMid]->m_nCharStart &&
+               (nIndex < m_ParagPtrArray[nMid]->m_nCharStart +
+                             m_ParagPtrArray[nMid]->m_nCharCount));
+  ParagPos.nParagIndex = nMid;
+  ParagPos.nCharIndex = nIndex - m_ParagPtrArray[nMid]->m_nCharStart;
+}
+int32_t CFDE_TxtEdtEngine::MoveForward(FX_BOOL& bBefore) {
+  if (m_nCaret == m_pTxtBuf->GetTextLength() - 1) {
+    return -1;
+  }
+  int32_t nCaret = m_nCaret;
+  if ((nCaret + 1 < m_pTxtBuf->GetTextLength()) &&
+      (m_pTxtBuf->GetCharByIndex(nCaret) == L'\r') &&
+      (m_pTxtBuf->GetCharByIndex(nCaret + 1) == L'\n')) {
+    nCaret++;
+  }
+  nCaret++;
+  bBefore = TRUE;
+  return nCaret;
+}
+int32_t CFDE_TxtEdtEngine::MoveBackward(FX_BOOL& bBefore) {
+  if (m_nCaret == 0) {
+    return FALSE;
+  }
+  int32_t nCaret = m_nCaret;
+  if (nCaret > 2 && m_pTxtBuf->GetCharByIndex(nCaret - 1) == L'\n' &&
+      m_pTxtBuf->GetCharByIndex(nCaret - 2) == L'\r') {
+    nCaret--;
+  }
+  nCaret--;
+  bBefore = TRUE;
+  return nCaret;
+}
+FX_BOOL CFDE_TxtEdtEngine::MoveUp(CFX_PointF& ptCaret) {
+  IFDE_TxtEdtPage* pPage = GetPage(m_nCaretPage);
+  const CFX_RectF& rtContent = pPage->GetContentsBox();
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_DocVertical) {
+    ptCaret.x = m_rtCaret.left + m_rtCaret.width / 2 - m_Param.fLineSpace;
+    ptCaret.y = m_fCaretPosReserve;
+    FX_BOOL bLineReserve =
+        m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_LineReserve;
+    if (ptCaret.x < rtContent.left) {
+      if (bLineReserve) {
+        if (m_nCaretPage == CountPages() - 1) {
+          return FALSE;
+        }
+      } else {
+        if (m_nCaretPage == 0) {
+          return FALSE;
+        }
+      }
+      if (bLineReserve) {
+        m_nCaretPage++;
+      } else {
+        m_nCaretPage--;
+      }
+      m_Param.pEventSink->On_PageChange(this, m_nCaretPage);
+      ptCaret.x -= rtContent.left;
+      IFDE_TxtEdtPage* pCurPage = GetPage(m_nCaretPage);
+      ptCaret.x += pCurPage->GetContentsBox().right();
+    }
+  } else {
+    ptCaret.x = m_fCaretPosReserve;
+    ptCaret.y = m_rtCaret.top + m_rtCaret.height / 2 - m_Param.fLineSpace;
+    if (ptCaret.y < rtContent.top) {
+      if (m_nCaretPage == 0) {
+        return FALSE;
+      }
+      ptCaret.y -= rtContent.top;
+      m_nCaretPage--;
+      m_Param.pEventSink->On_PageChange(this, m_nCaretPage);
+      IFDE_TxtEdtPage* pCurPage = GetPage(m_nCaretPage);
+      ptCaret.y += pCurPage->GetContentsBox().bottom();
+    }
+  }
+  return TRUE;
+}
+FX_BOOL CFDE_TxtEdtEngine::MoveDown(CFX_PointF& ptCaret) {
+  IFDE_TxtEdtPage* pPage = GetPage(m_nCaretPage);
+  const CFX_RectF& rtContent = pPage->GetContentsBox();
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_DocVertical) {
+    ptCaret.x = m_rtCaret.left + m_rtCaret.width / 2 + m_Param.fLineSpace;
+    ptCaret.y = m_fCaretPosReserve;
+    if (ptCaret.x >= rtContent.right()) {
+      FX_BOOL bLineReserve =
+          m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_LineReserve;
+      if (bLineReserve) {
+        if (m_nCaretPage == 0) {
+          return FALSE;
+        }
+      } else {
+        if (m_nCaretPage == CountPages() - 1) {
+          return FALSE;
+        }
+      }
+      if (bLineReserve) {
+        m_nCaretPage--;
+      } else {
+        m_nCaretPage++;
+      }
+      m_Param.pEventSink->On_PageChange(this, m_nCaretPage);
+      ptCaret.x -= rtContent.right();
+      IFDE_TxtEdtPage* pCurPage = GetPage(m_nCaretPage);
+      ptCaret.x += pCurPage->GetContentsBox().left;
+    }
+  } else {
+    ptCaret.x = m_fCaretPosReserve;
+    ptCaret.y = m_rtCaret.top + m_rtCaret.height / 2 + m_Param.fLineSpace;
+    if (ptCaret.y >= rtContent.bottom()) {
+      if (m_nCaretPage == CountPages() - 1) {
+        return FALSE;
+      }
+      ptCaret.y -= rtContent.bottom();
+      m_nCaretPage++;
+      m_Param.pEventSink->On_PageChange(this, m_nCaretPage);
+      IFDE_TxtEdtPage* pCurPage = GetPage(m_nCaretPage);
+      ptCaret.y += pCurPage->GetContentsBox().top;
+    }
+  }
+  return TRUE;
+}
+FX_BOOL CFDE_TxtEdtEngine::MoveLineStart() {
+  int32_t nIndex = m_bBefore ? m_nCaret : m_nCaret - 1;
+  FDE_TXTEDTPARAGPOS ParagPos;
+  TextPos2ParagPos(nIndex, ParagPos);
+  CFDE_TxtEdtParag* pParag = m_ParagPtrArray[ParagPos.nParagIndex];
+  pParag->LoadParag();
+  int32_t nLineCount = pParag->m_nLineCount;
+  int32_t i = 0;
+  int32_t nStart = 0;
+  int32_t nCount = 0;
+  for (; i < nLineCount; i++) {
+    pParag->GetLineRange(i, nStart, nCount);
+    if (nIndex >= nStart && nIndex < nStart + nCount) {
+      break;
+    }
+  }
+  UpdateCaretRect(nStart, TRUE);
+  pParag->UnloadParag();
+  return TRUE;
+}
+FX_BOOL CFDE_TxtEdtEngine::MoveLineEnd() {
+  int32_t nIndex = m_bBefore ? m_nCaret : m_nCaret - 1;
+  FDE_TXTEDTPARAGPOS ParagPos;
+  TextPos2ParagPos(nIndex, ParagPos);
+  CFDE_TxtEdtParag* pParag = m_ParagPtrArray[ParagPos.nParagIndex];
+  pParag->LoadParag();
+  int32_t nLineCount = pParag->m_nLineCount;
+  int32_t i = 0;
+  int32_t nStart = 0;
+  int32_t nCount = 0;
+  for (; i < nLineCount; i++) {
+    pParag->GetLineRange(i, nStart, nCount);
+    if (nIndex >= nStart && nIndex < nStart + nCount) {
+      break;
+    }
+  }
+  nIndex = nStart + nCount - 1;
+  FXSYS_assert(nIndex <= GetTextBufLength());
+  FX_WCHAR wChar = m_pTxtBuf->GetCharByIndex(nIndex);
+  FX_BOOL bBefore = FALSE;
+  if (nIndex <= GetTextBufLength()) {
+    if (wChar == L'\r') {
+      bBefore = TRUE;
+    } else if (wChar == L'\n' && nIndex > nStart) {
+      bBefore = TRUE;
+      nIndex--;
+      wChar = m_pTxtBuf->GetCharByIndex(nIndex);
+      if (wChar != L'\r') {
+        nIndex++;
+      }
+    }
+  }
+  UpdateCaretRect(nIndex, bBefore);
+  pParag->UnloadParag();
+  return TRUE;
+}
+FX_BOOL CFDE_TxtEdtEngine::MoveParagStart() {
+  int32_t nIndex = m_bBefore ? m_nCaret : m_nCaret - 1;
+  FDE_TXTEDTPARAGPOS ParagPos;
+  TextPos2ParagPos(nIndex, ParagPos);
+  CFDE_TxtEdtParag* pParag = m_ParagPtrArray[ParagPos.nParagIndex];
+  UpdateCaretRect(pParag->m_nCharStart, TRUE);
+  return TRUE;
+}
+FX_BOOL CFDE_TxtEdtEngine::MoveParagEnd() {
+  int32_t nIndex = m_bBefore ? m_nCaret : m_nCaret - 1;
+  FDE_TXTEDTPARAGPOS ParagPos;
+  TextPos2ParagPos(nIndex, ParagPos);
+  CFDE_TxtEdtParag* pParag = m_ParagPtrArray[ParagPos.nParagIndex];
+  nIndex = pParag->m_nCharStart + pParag->m_nCharCount - 1;
+  FX_WCHAR wChar = m_pTxtBuf->GetCharByIndex(nIndex);
+  if (wChar == L'\n' && nIndex > 0) {
+    nIndex--;
+    wChar = m_pTxtBuf->GetCharByIndex(nIndex);
+    if (wChar != L'\r') {
+      nIndex++;
+    }
+  }
+  UpdateCaretRect(nIndex, TRUE);
+  return TRUE;
+}
+FX_BOOL CFDE_TxtEdtEngine::MoveHome() {
+  UpdateCaretRect(0, TRUE);
+  return TRUE;
+}
+FX_BOOL CFDE_TxtEdtEngine::MoveEnd() {
+  UpdateCaretRect(GetTextBufLength(), TRUE);
+  return TRUE;
+}
+
+FX_BOOL CFDE_TxtEdtEngine::IsFitArea(CFX_WideString& wsText) {
+  IFDE_TextOut* pTextOut = IFDE_TextOut::Create();
+  pTextOut->SetLineSpace(m_Param.fLineSpace);
+  pTextOut->SetFont(m_Param.pFont);
+  pTextOut->SetFontSize(m_Param.fFontSize);
+  CFX_RectF rcText;
+  FXSYS_memset(&rcText, 0, sizeof(rcText));
+  FX_DWORD dwStyle = 0;
+  if (!(m_Param.dwMode & FDE_TEXTEDITMODE_MultiLines)) {
+    dwStyle |= FDE_TTOSTYLE_SingleLine;
+  }
+  if (m_Param.dwMode & FDE_TEXTEDITMODE_AutoLineWrap) {
+    dwStyle |= FDE_TTOSTYLE_LineWrap;
+    rcText.width = m_Param.fPlateWidth;
+  } else {
+    rcText.width = 65535;
+  }
+  pTextOut->SetStyles(dwStyle);
+  wsText += L"\n";
+  pTextOut->CalcLogicSize(wsText, wsText.GetLength(), rcText);
+  pTextOut->Release();
+  wsText.Delete(wsText.GetLength() - 1);
+  if ((m_Param.dwMode & FDE_TEXTEDITMODE_LimitArea_Horz) &&
+      (rcText.width > m_Param.fPlateWidth)) {
+    return FALSE;
+  }
+  if ((m_Param.dwMode & FDE_TEXTEDITMODE_LimitArea_Vert) &&
+      (rcText.height > m_Param.fLineSpace * m_Param.nLineCount)) {
+    return FALSE;
+  }
+  return TRUE;
+}
+void CFDE_TxtEdtEngine::UpdateCaretRect(int32_t nIndex, FX_BOOL bBefore) {
+  MovePage2Char(nIndex);
+  GetCaretRect(m_rtCaret, m_nCaretPage, nIndex, bBefore);
+  m_nCaret = nIndex;
+  m_bBefore = bBefore;
+  if (!m_bBefore) {
+    m_nCaret++;
+    m_bBefore = TRUE;
+  }
+  m_fCaretPosReserve = (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_DocVertical)
+                           ? m_rtCaret.top
+                           : m_rtCaret.left;
+  m_Param.pEventSink->On_CaretChanged(this, m_nCaretPage, 0);
+}
+void CFDE_TxtEdtEngine::GetCaretRect(CFX_RectF& rtCaret,
+                                     int32_t nPageIndex,
+                                     int32_t nCaret,
+                                     FX_BOOL bBefore) {
+  IFDE_TxtEdtPage* pPage = m_PagePtrArray[m_nCaretPage];
+  m_Param.pEventSink->On_PageLoad(this, m_nCaretPage, 0);
+  FX_BOOL bCombText = m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_CombText;
+  int32_t nIndexInpage = nCaret - pPage->GetCharStart();
+  if (bBefore && bCombText && nIndexInpage > 0) {
+    nIndexInpage--;
+    bBefore = FALSE;
+  }
+  int32_t nBIDILevel = pPage->GetCharRect(nIndexInpage, rtCaret, bCombText);
+  if (m_Param.dwLayoutStyles & FDE_TEXTEDITLAYOUT_DocVertical) {
+    if ((!FX_IsOdd(nBIDILevel) && !bBefore) ||
+        (FX_IsOdd(nBIDILevel) && bBefore)) {
+      rtCaret.Offset(0, rtCaret.height - 1.0f);
+    }
+    if (rtCaret.height == 0 && rtCaret.top > 1.0f) {
+      rtCaret.top -= 1.0f;
+    }
+    rtCaret.height = 1.0f;
+  } else {
+    if ((!FX_IsOdd(nBIDILevel) && !bBefore) ||
+        (FX_IsOdd(nBIDILevel) && bBefore)) {
+      rtCaret.Offset(rtCaret.width - 1.0f, 0);
+    }
+    if (rtCaret.width == 0 && rtCaret.left > 1.0f) {
+      rtCaret.left -= 1.0f;
+    }
+    rtCaret.width = 1.0f;
+  }
+  m_Param.pEventSink->On_PageUnload(this, m_nCaretPage, 0);
+}
+void CFDE_TxtEdtEngine::UpdateCaretIndex(const CFX_PointF& ptCaret) {
+  IFDE_TxtEdtPage* pPage = m_PagePtrArray[m_nCaretPage];
+  m_Param.pEventSink->On_PageLoad(this, m_nCaretPage, 0);
+  m_nCaret = pPage->GetCharIndex(ptCaret, m_bBefore);
+  GetCaretRect(m_rtCaret, m_nCaretPage, m_nCaret, m_bBefore);
+  if (!m_bBefore) {
+    m_nCaret++;
+    m_bBefore = TRUE;
+  }
+  m_Param.pEventSink->On_CaretChanged(this, m_nCaretPage);
+  m_Param.pEventSink->On_PageUnload(this, m_nCaretPage, 0);
+}
+FX_BOOL CFDE_TxtEdtEngine::IsSelect() {
+  return m_SelRangePtrArr.GetSize() > 0;
+}
+void CFDE_TxtEdtEngine::DeleteSelect() {
+  int32_t nCountRange = CountSelRanges();
+  if (nCountRange > 0) {
+    int32_t nSelStart;
+    int32_t nSelCount;
+    while (nCountRange > 0) {
+      nSelCount = GetSelRange(--nCountRange, nSelStart);
+      FDE_LPTXTEDTSELRANGE lpTemp = m_SelRangePtrArr[nCountRange];
+      delete lpTemp;
+      m_SelRangePtrArr.RemoveAt(nCountRange);
+      DeleteRange_DoRecord(nSelStart, nSelCount, TRUE);
+    }
+    ClearSelection();
+    m_Param.pEventSink->On_TextChanged(this, m_ChangeInfo);
+    m_Param.pEventSink->On_SelChanged(this);
+    SetCaretPos(nSelStart, TRUE);
+    return;
+  }
+}
+IFDE_TxtEdtDoRecord* IFDE_TxtEdtDoRecord::Create(
+    const CFX_ByteStringC& bsDoRecord) {
+  const FX_CHAR* lpBuf = bsDoRecord.GetCStr();
+  int32_t nType = *((int32_t*)lpBuf);
+  switch (nType) {
+    case FDE_TXTEDT_DORECORD_INS:
+      return new CFDE_TxtEdtDoRecord_Insert(bsDoRecord);
+    case FDE_TXTEDT_DORECORD_DEL:
+      return new CFDE_TxtEdtDoRecord_DeleteRange(bsDoRecord);
+    default:
+      break;
+  }
+  return NULL;
+}
+CFDE_TxtEdtDoRecord_Insert::CFDE_TxtEdtDoRecord_Insert(
+    const CFX_ByteStringC& bsDoRecord) {
+  Deserialize(bsDoRecord);
+}
+CFDE_TxtEdtDoRecord_Insert::CFDE_TxtEdtDoRecord_Insert(
+    CFDE_TxtEdtEngine* pEngine,
+    int32_t nCaret,
+    const FX_WCHAR* lpText,
+    int32_t nLength)
+    : m_pEngine(pEngine), m_nCaret(nCaret) {
+  FXSYS_assert(pEngine);
+  FX_WCHAR* lpBuffer = m_wsInsert.GetBuffer(nLength);
+  FXSYS_memcpy(lpBuffer, lpText, nLength * sizeof(FX_WCHAR));
+  m_wsInsert.ReleaseBuffer();
+}
+CFDE_TxtEdtDoRecord_Insert::~CFDE_TxtEdtDoRecord_Insert() {}
+void CFDE_TxtEdtDoRecord_Insert::Release() {
+  delete this;
+}
+FX_BOOL CFDE_TxtEdtDoRecord_Insert::Undo() {
+  if (m_pEngine->IsSelect()) {
+    m_pEngine->ClearSelection();
+  }
+  m_pEngine->Inner_DeleteRange(m_nCaret, m_wsInsert.GetLength());
+  FDE_TXTEDTPARAMS& Param = m_pEngine->m_Param;
+  m_pEngine->m_ChangeInfo.nChangeType = FDE_TXTEDT_TEXTCHANGE_TYPE_Delete;
+  m_pEngine->m_ChangeInfo.wsDelete = m_wsInsert;
+  Param.pEventSink->On_TextChanged(m_pEngine, m_pEngine->m_ChangeInfo);
+  m_pEngine->SetCaretPos(m_nCaret, TRUE);
+  return TRUE;
+}
+FX_BOOL CFDE_TxtEdtDoRecord_Insert::Redo() {
+  m_pEngine->Inner_Insert(m_nCaret, m_wsInsert.c_str(), m_wsInsert.GetLength());
+  FDE_TXTEDTPARAMS& Param = m_pEngine->m_Param;
+  m_pEngine->m_ChangeInfo.nChangeType = FDE_TXTEDT_TEXTCHANGE_TYPE_Insert;
+  m_pEngine->m_ChangeInfo.wsDelete = m_wsInsert;
+  Param.pEventSink->On_TextChanged(m_pEngine, m_pEngine->m_ChangeInfo);
+  m_pEngine->SetCaretPos(m_nCaret, FALSE);
+  return TRUE;
+}
+void CFDE_TxtEdtDoRecord_Insert::Serialize(CFX_ByteString& bsDoRecord) const {
+  CFX_ArchiveSaver ArchiveSaver;
+  ArchiveSaver << int32_t(FDE_TXTEDT_DORECORD_INS);
+  ArchiveSaver << (int32_t)(uintptr_t)m_pEngine;
+  ArchiveSaver << m_nCaret;
+  ArchiveSaver << m_wsInsert;
+  int32_t nLength = ArchiveSaver.GetLength();
+  const uint8_t* lpSrcBuf = ArchiveSaver.GetBuffer();
+  FX_CHAR* lpDstBuf = bsDoRecord.GetBuffer(nLength);
+  FXSYS_memcpy(lpDstBuf, lpSrcBuf, nLength);
+  bsDoRecord.ReleaseBuffer(nLength);
+}
+void CFDE_TxtEdtDoRecord_Insert::Deserialize(
+    const CFX_ByteStringC& bsDoRecord) {
+  CFX_ArchiveLoader ArchiveLoader((const uint8_t*)bsDoRecord.GetCStr(),
+                                  bsDoRecord.GetLength());
+  int32_t nType = 0;
+  ArchiveLoader >> nType;
+  FXSYS_assert(nType == FDE_TXTEDT_DORECORD_INS);
+  int32_t nEngine = 0;
+  ArchiveLoader >> nEngine;
+  m_pEngine = (CFDE_TxtEdtEngine*)(uintptr_t)nEngine;
+  ArchiveLoader >> m_nCaret;
+  ArchiveLoader >> m_wsInsert;
+}
+CFDE_TxtEdtDoRecord_DeleteRange::CFDE_TxtEdtDoRecord_DeleteRange(
+    const CFX_ByteStringC& bsDoRecord) {
+  Deserialize(bsDoRecord);
+}
+CFDE_TxtEdtDoRecord_DeleteRange::CFDE_TxtEdtDoRecord_DeleteRange(
+    CFDE_TxtEdtEngine* pEngine,
+    int32_t nIndex,
+    int32_t nCaret,
+    const CFX_WideString& wsRange,
+    FX_BOOL bSel)
+    : m_pEngine(pEngine),
+      m_bSel(bSel),
+      m_nIndex(nIndex),
+      m_nCaret(nCaret),
+      m_wsRange(wsRange) {
+  FXSYS_assert(pEngine);
+}
+CFDE_TxtEdtDoRecord_DeleteRange::~CFDE_TxtEdtDoRecord_DeleteRange() {}
+void CFDE_TxtEdtDoRecord_DeleteRange::Release() {
+  delete this;
+}
+FX_BOOL CFDE_TxtEdtDoRecord_DeleteRange::Undo() {
+  if (m_pEngine->IsSelect()) {
+    m_pEngine->ClearSelection();
+  }
+  m_pEngine->Inner_Insert(m_nIndex, m_wsRange.c_str(), m_wsRange.GetLength());
+  if (m_bSel) {
+    m_pEngine->AddSelRange(m_nIndex, m_wsRange.GetLength());
+  }
+  FDE_TXTEDTPARAMS& Param = m_pEngine->m_Param;
+  m_pEngine->m_ChangeInfo.nChangeType = FDE_TXTEDT_TEXTCHANGE_TYPE_Insert;
+  m_pEngine->m_ChangeInfo.wsDelete = m_wsRange;
+  Param.pEventSink->On_TextChanged(m_pEngine, m_pEngine->m_ChangeInfo);
+  m_pEngine->SetCaretPos(m_nCaret, TRUE);
+  return TRUE;
+}
+FX_BOOL CFDE_TxtEdtDoRecord_DeleteRange::Redo() {
+  m_pEngine->Inner_DeleteRange(m_nIndex, m_wsRange.GetLength());
+  if (m_bSel) {
+    m_pEngine->RemoveSelRange(m_nIndex, m_wsRange.GetLength());
+  }
+  FDE_TXTEDTPARAMS& Param = m_pEngine->m_Param;
+  m_pEngine->m_ChangeInfo.nChangeType = FDE_TXTEDT_TEXTCHANGE_TYPE_Insert;
+  m_pEngine->m_ChangeInfo.wsDelete = m_wsRange;
+  Param.pEventSink->On_TextChanged(m_pEngine, m_pEngine->m_ChangeInfo);
+  m_pEngine->SetCaretPos(m_nIndex, TRUE);
+  return TRUE;
+}
+void CFDE_TxtEdtDoRecord_DeleteRange::Serialize(
+    CFX_ByteString& bsDoRecord) const {
+  CFX_ArchiveSaver ArchiveSaver;
+  ArchiveSaver << int32_t(FDE_TXTEDT_DORECORD_DEL);
+  ArchiveSaver << (int32_t)(uintptr_t)m_pEngine;
+  ArchiveSaver << (int32_t)m_bSel;
+  ArchiveSaver << m_nIndex;
+  ArchiveSaver << m_nCaret;
+  ArchiveSaver << m_wsRange;
+  int32_t nLength = ArchiveSaver.GetLength();
+  const uint8_t* lpSrcBuf = ArchiveSaver.GetBuffer();
+  FX_CHAR* lpDstBuf = bsDoRecord.GetBuffer(nLength);
+  FXSYS_memcpy(lpDstBuf, lpSrcBuf, nLength);
+  bsDoRecord.ReleaseBuffer(nLength);
+}
+void CFDE_TxtEdtDoRecord_DeleteRange::Deserialize(
+    const CFX_ByteStringC& bsDoRecord) {
+  CFX_ArchiveLoader ArchiveLoader((const uint8_t*)bsDoRecord.GetCStr(),
+                                  bsDoRecord.GetLength());
+  int32_t nType = 0;
+  ArchiveLoader >> nType;
+  FXSYS_assert(nType == FDE_TXTEDT_DORECORD_DEL);
+  int32_t nEngine = 0;
+  ArchiveLoader >> nEngine;
+  m_pEngine = (CFDE_TxtEdtEngine*)(uintptr_t)nEngine;
+  int32_t iSel = 0;
+  ArchiveLoader >> iSel;
+  m_bSel = !!iSel;
+  ArchiveLoader >> m_nIndex;
+  ArchiveLoader >> m_nCaret;
+  ArchiveLoader >> m_wsRange;
+}