Fold IFWL*::{Initialize|Finalize} into constructor/destructor

xfa/fwl/core/ifwl_combolist.cpp

 // Copyright 2016 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/ifwl_combolist.h"
 
+#include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/ifwl_combobox.h"
 #include "xfa/fwl/core/ifwl_comboedit.h"
 
 IFWL_ComboList::IFWL_ComboList(const IFWL_App* app,
                                const CFWL_WidgetImpProperties& properties,
                                IFWL_Widget* pOuter)
     : IFWL_ListBox(app, properties, pOuter), m_bNotifyOwner(TRUE) {
   ASSERT(pOuter);
-}
-
-void IFWL_ComboList::Initialize() {
-  IFWL_ListBox::Initialize();
-
-  // Delete the delegate that was created by IFWL_ListBox::Initialize ...
-  delete m_pDelegate;
-  m_pDelegate = new CFWL_ComboListImpDelegate(this);
-}
-
-void IFWL_ComboList::Finalize() {
-  delete m_pDelegate;
-  m_pDelegate = nullptr;
-  IFWL_ListBox::Finalize();
+  SetDelegate(pdfium::MakeUnique<CFWL_ComboListImpDelegate>(this));
 }
 
 int32_t IFWL_ComboList::MatchItem(const CFX_WideString& wsMatch) {
   if (wsMatch.IsEmpty()) {
     return -1;
   }
   if (!m_pProperties->m_pDataProvider)
     return -1;
   IFWL_ListBoxDP* pData =
       static_cast<IFWL_ListBoxDP*>(m_pProperties->m_pDataProvider);
@@ skipping 147 matching lines @@
       int32_t iSel = pData->GetItemIndex(m_pOwner, hItem);
       CFWL_EvtCmbHoverChanged event;
       event.m_pSrcTarget = m_pOwner->m_pOuter;
       event.m_iCurHover = iSel;
       m_pOwner->DispatchEvent(&event);
       m_pOwner->ChangeSelected(iSel);
     }
   } else if (m_pOwner->m_bNotifyOwner) {
     m_pOwner->ClientToOuter(pMsg->m_fx, pMsg->m_fy);
     IFWL_ComboBox* pOuter = static_cast<IFWL_ComboBox*>(m_pOwner->m_pOuter);
-    pOuter->m_pDelegate->OnProcessMessage(pMsg);
+    pOuter->GetDelegate()->OnProcessMessage(pMsg);
   }
   return 1;
 }
 
 int32_t CFWL_ComboListImpDelegate::OnDropListLButtonDown(CFWL_MsgMouse* pMsg) {
   if (m_pOwner->m_rtClient.Contains(pMsg->m_fx, pMsg->m_fy)) {
     return 0;
   }
   IFWL_ComboBox* pOuter = static_cast<IFWL_ComboBox*>(m_pOwner->m_pOuter);
   pOuter->ShowDropList(FALSE);
   return 1;
 }
 
 int32_t CFWL_ComboListImpDelegate::OnDropListLButtonUp(CFWL_MsgMouse* pMsg) {
   IFWL_ComboBox* pOuter = static_cast<IFWL_ComboBox*>(m_pOwner->m_pOuter);
   if (m_pOwner->m_bNotifyOwner) {
     m_pOwner->ClientToOuter(pMsg->m_fx, pMsg->m_fy);
-    pOuter->m_pDelegate->OnProcessMessage(pMsg);
+    pOuter->GetDelegate()->OnProcessMessage(pMsg);
   } else {
     if (m_pOwner->IsShowScrollBar(TRUE) && m_pOwner->m_pVertScrollBar) {
       CFX_RectF rect;
       m_pOwner->m_pVertScrollBar->GetWidgetRect(rect);
       if (rect.Contains(pMsg->m_fx, pMsg->m_fy)) {
         return 1;
       }
     }
     pOuter->ShowDropList(FALSE);
     IFWL_ListItem* hItem = m_pOwner->GetItemAtPoint(pMsg->m_fx, pMsg->m_fy);
@@ skipping 21 matching lines @@
         pOuter->ProcessSelChanged(FALSE);
         return 1;
       }
       default: { bPropagate = TRUE; }
     }
   } else if (pKey->m_dwCmd == FWL_KeyCommand::Char) {
     bPropagate = TRUE;
   }
   if (bPropagate) {
     pKey->m_pDstTarget = m_pOwner->m_pOuter;
-    pOuter->m_pDelegate->OnProcessMessage(pKey);
+    pOuter->GetDelegate()->OnProcessMessage(pKey);
     return 1;
   }
   return 0;
 }
 
 void CFWL_ComboListImpDelegate::OnDropListKeyDown(CFWL_MsgKey* pKey) {
   uint32_t dwKeyCode = pKey->m_dwKeyCode;
   switch (dwKeyCode) {
     case FWL_VKEY_Up:
     case FWL_VKEY_Down:
@@ skipping 12 matching lines @@
       CFX_RectF rtInvalidate;
       rtInvalidate.Set(0, 0, m_pOwner->m_pProperties->m_rtWidget.width,
                        m_pOwner->m_pProperties->m_rtWidget.height);
       m_pOwner->Repaint(&rtInvalidate);
       break;
     }
     default:
       break;
   }
 }