Use smart pointers for class owned pointers

xfa/fwl/basewidget/fwl_editimp.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/basewidget/fwl_editimp.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 185 matching lines @@
   return static_cast<CFWL_EditImp*>(GetImpl())
       ->ReplaceSpellCheckWord(pointf, bsReplace);
 }
 
 CFWL_EditImp::CFWL_EditImp(const CFWL_WidgetImpProperties& properties,
                            IFWL_Widget* pOuter)
     : CFWL_WidgetImp(properties, pOuter),
       m_fVAlignOffset(0.0f),
       m_fScrollOffsetX(0.0f),
       m_fScrollOffsetY(0.0f),
-      m_pEdtEngine(nullptr),
       m_bLButtonDown(FALSE),
       m_nSelStart(0),
       m_nLimit(-1),
       m_fSpaceAbove(0),
       m_fSpaceBelow(0),
       m_fFontSize(0),
       m_bSetRange(FALSE),
       m_iMin(-1),
       m_iMax(0xFFFFFFF),
       m_backColor(0),
       m_updateBackColor(FALSE),
       m_iCurRecord(-1),
       m_iMaxRecord(128) {
   m_rtClient.Reset();
   m_rtEngine.Reset();
   m_rtStatic.Reset();
 }
 
 CFWL_EditImp::~CFWL_EditImp() {
-  delete m_pEdtEngine;
   ClearRecord();
 }
 
 FWL_Error CFWL_EditImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_Edit;
   return FWL_Error::Succeeded;
 }
 
 FWL_Type CFWL_EditImp::GetClassID() const {
   return FWL_Type::Edit;
@@ skipping 654 matching lines @@
   CFWL_EvtEdtTextChanged event;
   event.m_pSrcTarget = m_pInterface;
   event.nChangeType = ChangeInfo.nChangeType;
   event.wsInsert = ChangeInfo.wsInsert;
   event.wsDelete = ChangeInfo.wsDelete;
   event.wsPrevText = ChangeInfo.wsPrevText;
   DispatchEvent(&event);
   LayoutScrollBar();
   Repaint(&rtTemp);
 }
+
 void CFWL_EditImp::On_SelChanged(CFDE_TxtEdtEngine* pEdit) {
   CFX_RectF rtTemp;
   GetClientRect(rtTemp);
   Repaint(&rtTemp);
 }
+
 FX_BOOL CFWL_EditImp::On_PageLoad(CFDE_TxtEdtEngine* pEdit,
                                   int32_t nPageIndex,
                                   int32_t nPurpose) {
-  CFDE_TxtEdtEngine* pEdtEngine = m_pEdtEngine;
-  IFDE_TxtEdtPage* pPage = pEdtEngine->GetPage(nPageIndex);
+  IFDE_TxtEdtPage* pPage = m_pEdtEngine->GetPage(nPageIndex);
   if (!pPage)
     return FALSE;
   pPage->LoadPage(nullptr, nullptr);
   return TRUE;
 }
+
 FX_BOOL CFWL_EditImp::On_PageUnload(CFDE_TxtEdtEngine* pEdit,
                                     int32_t nPageIndex,
                                     int32_t nPurpose) {
-  CFDE_TxtEdtEngine* pEdtEngine = m_pEdtEngine;
-  IFDE_TxtEdtPage* pPage = pEdtEngine->GetPage(nPageIndex);
+  IFDE_TxtEdtPage* pPage = m_pEdtEngine->GetPage(nPageIndex);
   if (!pPage)
     return FALSE;
   pPage->UnloadPage(nullptr);
   return TRUE;
 }
 
 void CFWL_EditImp::On_AddDoRecord(CFDE_TxtEdtEngine* pEdit,
                                   IFDE_TxtEdtDoRecord* pRecord) {
   AddDoRecord(pRecord);
 }
@@ skipping 692 matching lines @@
   prop.m_dwStates = FWL_WGTSTATE_Disabled | FWL_WGTSTATE_Invisible;
   prop.m_pParent = m_pInterface;
   prop.m_pThemeProvider = m_pProperties->m_pThemeProvider;
   IFWL_ScrollBar* pScrollBar = IFWL_ScrollBar::Create(prop, m_pInterface);
   pScrollBar->Initialize();
   (bVert ? &m_pVertScrollBar : &m_pHorzScrollBar)->reset(pScrollBar);
 }
 
 void CFWL_EditImp::InitEngine() {
   if (!m_pEdtEngine)
-    m_pEdtEngine = new CFDE_TxtEdtEngine;
+    m_pEdtEngine.reset(new CFDE_TxtEdtEngine);
 }
 
 FX_BOOL FWL_ShowCaret(IFWL_Widget* pWidget,
                       FX_BOOL bVisible,
                       const CFX_RectF* pRtAnchor) {
   CXFA_FFWidget* pXFAWidget =
       static_cast<CXFA_FFWidget*>(pWidget->GetLayoutItem());
   if (!pXFAWidget)
     return FALSE;
 
@@ skipping 542 matching lines @@
     }
     CFX_RectF rect;
     m_pOwner->GetWidgetRect(rect);
     CFX_RectF rtInvalidate;
     rtInvalidate.Set(0, 0, rect.width + 2, rect.height + 2);
     m_pOwner->Repaint(&rtInvalidate);
   }
   return TRUE;
 }
 void CFWL_EditImpDelegate::DoCursor(CFWL_MsgMouse* pMsg) {}