[xfa] Move CJX code into fxjs/xfa

This CL moves the remaining CJX clases into fxjs/xfa so they co-exist
with the rest of the CJX classes.

Change-Id: I2b1e5504ac23f73df177f309967a04ab27fb61d1
Reviewed-on: https://pdfium-review.googlesource.com/20550
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

1 files changed, 0 insertions, 639 deletions

diff --git a/fxjs/cjx_hostpseudomodel.cpp b/fxjs/cjx_hostpseudomodel.cpp
deleted file mode 100644
index c4467b8755..0000000000
--- a/fxjs/cjx_hostpseudomodel.cpp
+++ /dev/null
@@ -1,639 +0,0 @@
-// Copyright 2017 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 "fxjs/cjx_hostpseudomodel.h"
-
-#include <memory>
-#include <vector>
-
-#include "fxjs/cfxjse_engine.h"
-#include "fxjs/cfxjse_value.h"
-#include "fxjs/js_resources.h"
-#include "xfa/fxfa/cxfa_ffnotify.h"
-#include "xfa/fxfa/parser/cscript_hostpseudomodel.h"
-#include "xfa/fxfa/parser/cxfa_layoutprocessor.h"
-#include "xfa/fxfa/parser/cxfa_node.h"
-#include "xfa/fxfa/parser/xfa_resolvenode_rs.h"
-
-namespace {
-
-int32_t FilterName(const WideStringView& wsExpression,
-                   int32_t nStart,
-                   WideString& wsFilter) {
-  ASSERT(nStart > -1);
-  int32_t iLength = wsExpression.GetLength();
-  if (nStart >= iLength)
-    return iLength;
-
-  wchar_t* pBuf = wsFilter.GetBuffer(iLength - nStart);
-  int32_t nCount = 0;
-  const wchar_t* pSrc = wsExpression.unterminated_c_str();
-  wchar_t wCur;
-  while (nStart < iLength) {
-    wCur = pSrc[nStart++];
-    if (wCur == ',')
-      break;
-
-    pBuf[nCount++] = wCur;
-  }
-  wsFilter.ReleaseBuffer(nCount);
-  wsFilter.Trim();
-  return nStart;
-}
-
-}  // namespace
-
-const CJX_MethodSpec CJX_HostPseudoModel::MethodSpecs[] = {
-    {"beep", beep_static},
-    {"documentCountInBatch", documentCountInBatch_static},
-    {"documentInBatch", documentInBatch_static},
-    {"exportData", exportData_static},
-    {"getFocus", getFocus_static},
-    {"gotoURL", gotoURL_static},
-    {"importData", importData_static},
-    {"messageBox", messageBox_static},
-    {"openList", openList_static},
-    {"pageDown", pageDown_static},
-    {"pageUp", pageUp_static},
-    {"print", print_static},
-    {"resetData", resetData_static},
-    {"response", response_static},
-    {"setFocus", setFocus_static},
-    {"", nullptr}};
-
-CJX_HostPseudoModel::CJX_HostPseudoModel(CScript_HostPseudoModel* model)
-    : CJX_Object(model) {
-  DefineMethods(MethodSpecs);
-}
-
-CJX_HostPseudoModel::~CJX_HostPseudoModel() {}
-
-void CJX_HostPseudoModel::AppType(CFXJSE_Value* pValue,
-                                  bool bSetting,
-                                  XFA_Attribute eAttribute) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  if (bSetting) {
-    ThrowInvalidPropertyException();
-    return;
-  }
-  pValue->SetString("Exchange");
-}
-
-void CJX_HostPseudoModel::CalculationsEnabled(CFXJSE_Value* pValue,
-                                              bool bSetting,
-                                              XFA_Attribute eAttribute) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  CXFA_FFDoc* hDoc = pNotify->GetHDOC();
-  if (bSetting) {
-    pNotify->GetDocEnvironment()->SetCalculationsEnabled(hDoc,
-                                                         pValue->ToBoolean());
-    return;
-  }
-  pValue->SetBoolean(pNotify->GetDocEnvironment()->IsCalculationsEnabled(hDoc));
-}
-
-void CJX_HostPseudoModel::CurrentPage(CFXJSE_Value* pValue,
-                                      bool bSetting,
-                                      XFA_Attribute eAttribute) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  CXFA_FFDoc* hDoc = pNotify->GetHDOC();
-  if (bSetting) {
-    pNotify->GetDocEnvironment()->SetCurrentPage(hDoc, pValue->ToInteger());
-    return;
-  }
-  pValue->SetInteger(pNotify->GetDocEnvironment()->GetCurrentPage(hDoc));
-}
-
-void CJX_HostPseudoModel::Language(CFXJSE_Value* pValue,
-                                   bool bSetting,
-                                   XFA_Attribute eAttribute) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  if (bSetting) {
-    ThrowException(L"Unable to set language value.");
-    return;
-  }
-  pValue->SetString(
-      pNotify->GetAppProvider()->GetLanguage().UTF8Encode().AsStringView());
-}
-
-void CJX_HostPseudoModel::NumPages(CFXJSE_Value* pValue,
-                                   bool bSetting,
-                                   XFA_Attribute eAttribute) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  CXFA_FFDoc* hDoc = pNotify->GetHDOC();
-  if (bSetting) {
-    ThrowException(L"Unable to set numPages value.");
-    return;
-  }
-  pValue->SetInteger(pNotify->GetDocEnvironment()->CountPages(hDoc));
-}
-
-void CJX_HostPseudoModel::Platform(CFXJSE_Value* pValue,
-                                   bool bSetting,
-                                   XFA_Attribute eAttribute) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  if (bSetting) {
-    ThrowException(L"Unable to set platform value.");
-    return;
-  }
-  pValue->SetString(
-      pNotify->GetAppProvider()->GetPlatform().UTF8Encode().AsStringView());
-}
-
-void CJX_HostPseudoModel::Title(CFXJSE_Value* pValue,
-                                bool bSetting,
-                                XFA_Attribute eAttribute) {
-  if (!GetDocument()->GetScriptContext()->IsRunAtClient())
-    return;
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  CXFA_FFDoc* hDoc = pNotify->GetHDOC();
-  if (bSetting) {
-    pNotify->GetDocEnvironment()->SetTitle(hDoc, pValue->ToWideString());
-    return;
-  }
-
-  WideString wsTitle;
-  pNotify->GetDocEnvironment()->GetTitle(hDoc, wsTitle);
-  pValue->SetString(wsTitle.UTF8Encode().AsStringView());
-}
-
-void CJX_HostPseudoModel::ValidationsEnabled(CFXJSE_Value* pValue,
-                                             bool bSetting,
-                                             XFA_Attribute eAttribute) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  CXFA_FFDoc* hDoc = pNotify->GetHDOC();
-  if (bSetting) {
-    pNotify->GetDocEnvironment()->SetValidationsEnabled(hDoc,
-                                                        pValue->ToBoolean());
-    return;
-  }
-
-  bool bEnabled = pNotify->GetDocEnvironment()->IsValidationsEnabled(hDoc);
-  pValue->SetBoolean(bEnabled);
-}
-
-void CJX_HostPseudoModel::Variation(CFXJSE_Value* pValue,
-                                    bool bSetting,
-                                    XFA_Attribute eAttribute) {
-  if (!GetDocument()->GetScriptContext()->IsRunAtClient())
-    return;
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  if (bSetting) {
-    ThrowException(L"Unable to set variation value.");
-    return;
-  }
-  pValue->SetString("Full");
-}
-
-void CJX_HostPseudoModel::Version(CFXJSE_Value* pValue,
-                                  bool bSetting,
-                                  XFA_Attribute eAttribute) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  if (bSetting) {
-    ThrowException(L"Unable to set version value.");
-    return;
-  }
-  pValue->SetString("11");
-}
-
-void CJX_HostPseudoModel::Name(CFXJSE_Value* pValue,
-                               bool bSetting,
-                               XFA_Attribute eAttribute) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return;
-
-  if (bSetting) {
-    ThrowInvalidPropertyException();
-    return;
-  }
-  pValue->SetString(
-      pNotify->GetAppProvider()->GetAppName().UTF8Encode().AsStringView());
-}
-
-CJS_Return CJX_HostPseudoModel::gotoURL(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  if (!GetDocument()->GetScriptContext()->IsRunAtClient())
-    return CJS_Return(true);
-
-  if (params.size() != 1)
-    return CJS_Return(JSGetStringFromID(JSMessage::kParamError));
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  CXFA_FFDoc* hDoc = pNotify->GetHDOC();
-  WideString URL = runtime->ToWideString(params[0]);
-  pNotify->GetDocEnvironment()->GotoURL(hDoc, URL);
-  return CJS_Return(true);
-}
-
-CJS_Return CJX_HostPseudoModel::openList(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  if (!GetDocument()->GetScriptContext()->IsRunAtClient())
-    return CJS_Return(true);
-
-  if (params.size() != 1)
-    return CJS_Return(JSGetStringFromID(JSMessage::kParamError));
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  CXFA_Node* pNode = nullptr;
-  if (params[0]->IsObject()) {
-    pNode = ToNode(runtime->ToXFAObject(params[0]));
-  } else if (params[0]->IsString()) {
-    CFXJSE_Engine* pScriptContext = GetDocument()->GetScriptContext();
-    if (!pScriptContext)
-      return CJS_Return(true);
-
-    CXFA_Object* pObject = pScriptContext->GetThisObject();
-    if (!pObject)
-      return CJS_Return(true);
-
-    uint32_t dwFlag = XFA_RESOLVENODE_Children | XFA_RESOLVENODE_Parent |
-                      XFA_RESOLVENODE_Siblings;
-    XFA_RESOLVENODE_RS resolveNodeRS;
-    bool iRet = pScriptContext->ResolveObjects(
-        pObject, runtime->ToWideString(params[0]).AsStringView(),
-        &resolveNodeRS, dwFlag, nullptr);
-    if (!iRet || !resolveNodeRS.objects.front()->IsNode())
-      return CJS_Return(true);
-
-    pNode = resolveNodeRS.objects.front()->AsNode();
-  }
-
-  CXFA_LayoutProcessor* pDocLayout = GetDocument()->GetDocLayout();
-  if (!pDocLayout)
-    return CJS_Return(true);
-
-  CXFA_FFWidget* hWidget =
-      pNotify->GetHWidget(pDocLayout->GetLayoutItem(pNode));
-  if (!hWidget)
-    return CJS_Return(true);
-
-  pNotify->GetDocEnvironment()->SetFocusWidget(pNotify->GetHDOC(), hWidget);
-  pNotify->OpenDropDownList(hWidget);
-  return CJS_Return(true);
-}
-
-CJS_Return CJX_HostPseudoModel::response(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  if (params.empty() || params.size() > 4)
-    return CJS_Return(JSGetStringFromID(JSMessage::kParamError));
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  WideString question;
-  if (params.size() >= 1)
-    question = runtime->ToWideString(params[0]);
-
-  WideString title;
-  if (params.size() >= 2)
-    title = runtime->ToWideString(params[1]);
-
-  WideString defaultAnswer;
-  if (params.size() >= 3)
-    defaultAnswer = runtime->ToWideString(params[2]);
-
-  bool mark = false;
-  if (params.size() >= 4)
-    mark = runtime->ToInt32(params[3]) != 0;
-
-  WideString answer =
-      pNotify->GetAppProvider()->Response(question, title, defaultAnswer, mark);
-  return CJS_Return(runtime->NewString(answer.UTF8Encode().AsStringView()));
-}
-
-CJS_Return CJX_HostPseudoModel::documentInBatch(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  return CJS_Return(runtime->NewNumber(0));
-}
-
-CJS_Return CJX_HostPseudoModel::resetData(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  if (params.size() > 1)
-    return CJS_Return(JSGetStringFromID(JSMessage::kParamError));
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  WideString expression;
-  if (params.size() >= 1)
-    expression = runtime->ToWideString(params[0]);
-
-  if (expression.IsEmpty()) {
-    pNotify->ResetData();
-    return CJS_Return(true);
-  }
-
-  int32_t iStart = 0;
-  WideString wsName;
-  CXFA_Node* pNode = nullptr;
-  int32_t iExpLength = expression.GetLength();
-  while (iStart < iExpLength) {
-    iStart = FilterName(expression.AsStringView(), iStart, wsName);
-    CFXJSE_Engine* pScriptContext = GetDocument()->GetScriptContext();
-    if (!pScriptContext)
-      return CJS_Return(true);
-
-    CXFA_Object* pObject = pScriptContext->GetThisObject();
-    if (!pObject)
-      return CJS_Return(true);
-
-    uint32_t dwFlag = XFA_RESOLVENODE_Children | XFA_RESOLVENODE_Parent |
-                      XFA_RESOLVENODE_Siblings;
-    XFA_RESOLVENODE_RS resolveNodeRS;
-    bool iRet = pScriptContext->ResolveObjects(pObject, wsName.AsStringView(),
-                                               &resolveNodeRS, dwFlag, nullptr);
-    if (!iRet || !resolveNodeRS.objects.front()->IsNode())
-      continue;
-
-    pNode = resolveNodeRS.objects.front()->AsNode();
-    pNotify->ResetData(pNode->GetWidgetData());
-  }
-  if (!pNode)
-    pNotify->ResetData();
-
-  return CJS_Return(true);
-}
-
-CJS_Return CJX_HostPseudoModel::beep(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  if (!GetDocument()->GetScriptContext()->IsRunAtClient())
-    return CJS_Return(true);
-
-  if (params.size() > 1)
-    return CJS_Return(JSGetStringFromID(JSMessage::kParamError));
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  uint32_t dwType = 4;
-  if (params.size() >= 1)
-    dwType = runtime->ToInt32(params[0]);
-
-  pNotify->GetAppProvider()->Beep(dwType);
-  return CJS_Return(true);
-}
-
-CJS_Return CJX_HostPseudoModel::setFocus(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  if (!GetDocument()->GetScriptContext()->IsRunAtClient())
-    return CJS_Return(true);
-
-  if (params.size() != 1)
-    return CJS_Return(JSGetStringFromID(JSMessage::kParamError));
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  CXFA_Node* pNode = nullptr;
-  if (params.size() >= 1) {
-    if (params[0]->IsObject()) {
-      pNode = ToNode(runtime->ToXFAObject(params[0]));
-    } else if (params[0]->IsString()) {
-      CFXJSE_Engine* pScriptContext = GetDocument()->GetScriptContext();
-      if (!pScriptContext)
-        return CJS_Return(true);
-
-      CXFA_Object* pObject = pScriptContext->GetThisObject();
-      if (!pObject)
-        return CJS_Return(true);
-
-      uint32_t dwFlag = XFA_RESOLVENODE_Children | XFA_RESOLVENODE_Parent |
-                        XFA_RESOLVENODE_Siblings;
-      XFA_RESOLVENODE_RS resolveNodeRS;
-      bool iRet = pScriptContext->ResolveObjects(
-          pObject, runtime->ToWideString(params[0]).AsStringView(),
-          &resolveNodeRS, dwFlag, nullptr);
-      if (!iRet || !resolveNodeRS.objects.front()->IsNode())
-        return CJS_Return(true);
-
-      pNode = resolveNodeRS.objects.front()->AsNode();
-    }
-  }
-  pNotify->SetFocusWidgetNode(pNode);
-  return CJS_Return(true);
-}
-
-CJS_Return CJX_HostPseudoModel::getFocus(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  CXFA_Node* pNode = pNotify->GetFocusWidgetNode();
-  if (!pNode)
-    return CJS_Return(true);
-
-  CFXJSE_Value* value =
-      GetDocument()->GetScriptContext()->GetJSValueFromMap(pNode);
-  if (!value)
-    return CJS_Return(runtime->NewNull());
-
-  return CJS_Return(value->DirectGetValue().Get(runtime->GetIsolate()));
-}
-
-CJS_Return CJX_HostPseudoModel::messageBox(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  if (!GetDocument()->GetScriptContext()->IsRunAtClient())
-    return CJS_Return(true);
-
-  if (params.empty() || params.size() > 4)
-    return CJS_Return(JSGetStringFromID(JSMessage::kParamError));
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  WideString message;
-  if (params.size() >= 1)
-    message = runtime->ToWideString(params[0]);
-
-  WideString title;
-  if (params.size() >= 2)
-    title = runtime->ToWideString(params[1]);
-
-  uint32_t messageType = XFA_MBICON_Error;
-  if (params.size() >= 3) {
-    messageType = runtime->ToInt32(params[2]);
-    if (messageType > XFA_MBICON_Status)
-      messageType = XFA_MBICON_Error;
-  }
-
-  uint32_t buttonType = XFA_MB_OK;
-  if (params.size() >= 4) {
-    buttonType = runtime->ToInt32(params[3]);
-    if (buttonType > XFA_MB_YesNoCancel)
-      buttonType = XFA_MB_OK;
-  }
-
-  int32_t iValue = pNotify->GetAppProvider()->MsgBox(message, title,
-                                                     messageType, buttonType);
-  return CJS_Return(runtime->NewNumber(iValue));
-}
-
-CJS_Return CJX_HostPseudoModel::documentCountInBatch(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  return CJS_Return(runtime->NewNumber(0));
-}
-
-CJS_Return CJX_HostPseudoModel::print(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  if (!GetDocument()->GetScriptContext()->IsRunAtClient())
-    return CJS_Return(true);
-
-  if (params.size() != 8)
-    return CJS_Return(JSGetStringFromID(JSMessage::kParamError));
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  uint32_t dwOptions = 0;
-  if (runtime->ToBoolean(params[0]))
-    dwOptions |= XFA_PRINTOPT_ShowDialog;
-  if (runtime->ToBoolean(params[3]))
-    dwOptions |= XFA_PRINTOPT_CanCancel;
-  if (runtime->ToBoolean(params[4]))
-    dwOptions |= XFA_PRINTOPT_ShrinkPage;
-  if (runtime->ToBoolean(params[5]))
-    dwOptions |= XFA_PRINTOPT_AsImage;
-  if (runtime->ToBoolean(params[6]))
-    dwOptions |= XFA_PRINTOPT_ReverseOrder;
-  if (runtime->ToBoolean(params[7]))
-    dwOptions |= XFA_PRINTOPT_PrintAnnot;
-
-  int32_t nStartPage = runtime->ToInt32(params[1]);
-  int32_t nEndPage = runtime->ToInt32(params[2]);
-
-  pNotify->GetDocEnvironment()->Print(pNotify->GetHDOC(), nStartPage, nEndPage,
-                                      dwOptions);
-  return CJS_Return(true);
-}
-
-CJS_Return CJX_HostPseudoModel::importData(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  if (params.empty() || params.size() > 1)
-    return CJS_Return(JSGetStringFromID(JSMessage::kParamError));
-
-  return CJS_Return(true);
-}
-
-CJS_Return CJX_HostPseudoModel::exportData(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  if (params.empty() || params.size() > 2)
-    return CJS_Return(JSGetStringFromID(JSMessage::kParamError));
-
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  WideString filePath;
-  if (params.size() >= 1)
-    filePath = runtime->ToWideString(params[0]);
-
-  bool XDP = true;
-  if (params.size() >= 2)
-    XDP = runtime->ToBoolean(params[1]);
-
-  pNotify->GetDocEnvironment()->ExportData(pNotify->GetHDOC(), filePath, XDP);
-  return CJS_Return(true);
-}
-
-CJS_Return CJX_HostPseudoModel::pageUp(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  CXFA_FFDoc* hDoc = pNotify->GetHDOC();
-  int32_t nCurPage = pNotify->GetDocEnvironment()->GetCurrentPage(hDoc);
-  int32_t nNewPage = 0;
-  if (nCurPage <= 1)
-    return CJS_Return(true);
-
-  nNewPage = nCurPage - 1;
-  pNotify->GetDocEnvironment()->SetCurrentPage(hDoc, nNewPage);
-  return CJS_Return(true);
-}
-
-CJS_Return CJX_HostPseudoModel::pageDown(
-    CJS_V8* runtime,
-    const std::vector<v8::Local<v8::Value>>& params) {
-  CXFA_FFNotify* pNotify = GetDocument()->GetNotify();
-  if (!pNotify)
-    return CJS_Return(true);
-
-  CXFA_FFDoc* hDoc = pNotify->GetHDOC();
-  int32_t nCurPage = pNotify->GetDocEnvironment()->GetCurrentPage(hDoc);
-  int32_t nPageCount = pNotify->GetDocEnvironment()->CountPages(hDoc);
-  if (!nPageCount || nCurPage == nPageCount)
-    return CJS_Return(true);
-
-  int32_t nNewPage = 0;
-  if (nCurPage >= nPageCount)
-    nNewPage = nPageCount - 1;
-  else
-    nNewPage = nCurPage + 1;
-
-  pNotify->GetDocEnvironment()->SetCurrentPage(hDoc, nNewPage);
-  return CJS_Return(true);
-}