Get rid of NULLs in xfa/

xfa/fwl/core/fwl_formimp.cpp

 // 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/fwl/core/fwl_formimp.h"
 
 #include "xfa/fde/tto/fde_textout.h"
 #include "xfa/fwl/basewidget/fwl_formproxyimp.h"
@@ skipping 375 matching lines @@
   m_pNoteLoop = new CFWL_NoteLoop(this);
   pDriver->PushNoteLoop(m_pNoteLoop);
   m_bDoModalFlag = TRUE;
   SetStates(FWL_WGTSTATE_Invisible, FALSE);
   pDriver->Run();
 #if (_FX_OS_ == _FX_MACOSX_)
 #else
   pDriver->PopNoteLoop();
 #endif
   delete m_pNoteLoop;
-  m_pNoteLoop = NULL;
-  return NULL;
+  m_pNoteLoop = nullptr;
+  return nullptr;
 }
 IFWL_Widget* CFWL_FormImp::DoModal(uint32_t& dwCommandID) {
   return DoModal();
 }
 FWL_Error CFWL_FormImp::EndDoModal() {
   if (!m_pNoteLoop)
     return FWL_Error::Indefinite;
   m_bDoModalFlag = FALSE;
 #if (_FX_OS_ == _FX_MACOSX_)
   m_pNoteLoop->EndModalLoop();
@@ skipping 80 matching lines @@
   }
   if (m_pMaxBox && m_pMaxBox->m_rtBtn.Contains(fx, fy)) {
     return m_pMaxBox;
   }
   if (m_pMinBox && m_pMinBox->m_rtBtn.Contains(fx, fy)) {
     return m_pMinBox;
   }
   if (m_pCaptionBox && m_pCaptionBox->m_rtBtn.Contains(fx, fy)) {
     return m_pCaptionBox;
   }
-  return NULL;
+  return nullptr;
 }
 CFWL_SysBtn* CFWL_FormImp::GetSysBtnByState(uint32_t dwState) {
   if (m_pCloseBox && (m_pCloseBox->m_dwState & dwState)) {
     return m_pCloseBox;
   }
   if (m_pMaxBox && (m_pMaxBox->m_dwState & dwState)) {
     return m_pMaxBox;
   }
   if (m_pMinBox && (m_pMinBox->m_dwState & dwState)) {
     return m_pMinBox;
   }
   if (m_pCaptionBox && (m_pCaptionBox->m_dwState & dwState)) {
     return m_pCaptionBox;
   }
-  return NULL;
+  return nullptr;
 }
 CFWL_SysBtn* CFWL_FormImp::GetSysBtnByIndex(int32_t nIndex) {
   if (nIndex < 0)
     return nullptr;
 
   CFX_ArrayTemplate<CFWL_SysBtn*> arrBtn;
   if (m_pMinBox)
     arrBtn.Add(m_pMinBox);
 
   if (m_pMaxBox)
@@ skipping 266 matching lines @@
 }
 void CFWL_FormImp::DoWidthLimit(FX_FLOAT& fLeft,
                                 FX_FLOAT& fWidth,
                                 FX_FLOAT fCurX,
                                 FX_FLOAT fSpace,
                                 FX_FLOAT fLimitMin,
                                 FX_FLOAT fLimitMax,
                                 FX_BOOL bLeft) {
   FX_FLOAT fx = fCurX;
   FX_FLOAT fy = 0;
-  TransformTo(NULL, fx, fy);
+  TransformTo(nullptr, fx, fy);
   FX_FLOAT fTemp =
       bLeft ? (fWidth - fx + fLeft + fSpace) : (fx - fLeft + fSpace);
   if (fTemp >= fLimitMin && fTemp <= fLimitMax) {
     fWidth = fTemp;
     fLeft += bLeft ? (fx - fLeft - fSpace) : 0;
   } else {
     if (fTemp < fLimitMin && fWidth > fLimitMin) {
       fLeft += bLeft ? (fWidth - fLimitMin) : 0;
       fWidth = fLimitMin;
     } else if (fTemp > fLimitMax && fWidth < fLimitMax) {
       fLeft -= bLeft ? (fLimitMax - fWidth) : 0;
       fWidth = fLimitMax;
     }
   }
 }
 void CFWL_FormImp::DoHeightLimit(FX_FLOAT& fTop,
                                  FX_FLOAT& fHeight,
                                  FX_FLOAT fCurY,
                                  FX_FLOAT fSpace,
                                  FX_FLOAT fLimitMin,
                                  FX_FLOAT fLimitMax,
                                  FX_BOOL bTop) {
   FX_FLOAT fx = 0;
   FX_FLOAT fy = fCurY;
-  TransformTo(NULL, fx, fy);
+  TransformTo(nullptr, fx, fy);
   FX_FLOAT fTemp = bTop ? (fHeight - fy + fTop + fSpace) : (fy - fTop + fSpace);
   if (fTemp >= fLimitMin && fTemp <= fLimitMax) {
     fHeight = fTemp;
     fTop += bTop ? (fy - fTop - fSpace) : 0;
   } else {
     if (fTemp < fLimitMin && fHeight > fLimitMin) {
       fTop += bTop ? (fHeight - fLimitMin) : 0;
       fHeight = fLimitMin;
     } else if (fTemp > fLimitMax && fHeight < fLimitMax) {
       fTop -= bTop ? (fLimitMax - fHeight) : 0;
@@ skipping 285 matching lines @@
 }
 void CFWL_FormImpDelegate::OnWindowMove(CFWL_MsgWindowMove* pMsg) {
   m_pOwner->m_pProperties->m_rtWidget.left = pMsg->m_fx;
   m_pOwner->m_pProperties->m_rtWidget.top = pMsg->m_fy;
 }
 void CFWL_FormImpDelegate::OnClose(CFWL_MsgClose* pMsg) {
   CFWL_EvtClose eClose;
   eClose.m_pSrcTarget = m_pOwner->m_pInterface;
   m_pOwner->DispatchEvent(&eClose);
 }