Make IFWL_Target::m_pImpl a private member.

xfa/src/fwl/src/basewidget/fwl_listboximp.cpp

Index: xfa/src/fwl/src/basewidget/fwl_listboximp.cpp
diff --git a/xfa/src/fwl/src/basewidget/fwl_listboximp.cpp b/xfa/src/fwl/src/basewidget/fwl_listboximp.cpp
index 09ef4cd0aeb9129ae47ab6188a8ecaa7a95f4088..0b96555b03af96abe4a06480134e266b906f2efe 100644
--- a/xfa/src/fwl/src/basewidget/fwl_listboximp.cpp
+++ b/xfa/src/fwl/src/basewidget/fwl_listboximp.cpp
@@ -15,45 +15,40 @@ IFWL_ListBox* IFWL_ListBox::Create() {
   return new IFWL_ListBox;
 }
 IFWL_ListBox::IFWL_ListBox() {
-  m_pImpl = NULL;
-}
-IFWL_ListBox::~IFWL_ListBox() {
-  if (m_pImpl) {
-    delete (CFWL_ListBoxImp*)m_pImpl;
-    m_pImpl = NULL;
-  }
 }
 FWL_ERR IFWL_ListBox::Initialize(IFWL_Widget* pOuter) {
-  m_pImpl = new CFWL_ListBoxImp(pOuter);
-  ((CFWL_ListBoxImp*)m_pImpl)->SetInterface(this);
-  return ((CFWL_ListBoxImp*)m_pImpl)->Initialize();
+  CFWL_ListBoxImp* pListBoxImpl = new CFWL_ListBoxImp(pOuter);
+  SetImpl(pListBoxImpl);
+  pListBoxImpl->SetInterface(this);
+  return pListBoxImpl->Initialize();
 }
 FWL_ERR IFWL_ListBox::Initialize(const CFWL_WidgetImpProperties& properties,
                                  IFWL_Widget* pOuter) {
-  m_pImpl = new CFWL_ListBoxImp(properties, pOuter);
-  ((CFWL_ListBoxImp*)m_pImpl)->SetInterface(this);
-  return ((CFWL_ListBoxImp*)m_pImpl)->Initialize();
+  CFWL_ListBoxImp* pListBoxImpl = new CFWL_ListBoxImp(properties, pOuter);
+  SetImpl(pListBoxImpl);
+  pListBoxImpl->SetInterface(this);
+  return pListBoxImpl->Initialize();
 }
 int32_t IFWL_ListBox::CountSelItems() {
-  return ((CFWL_ListBoxImp*)m_pImpl)->CountSelItems();
+  return static_cast<CFWL_ListBoxImp*>(GetImpl())->CountSelItems();
 }
 FWL_HLISTITEM IFWL_ListBox::GetSelItem(int32_t nIndexSel) {
-  return ((CFWL_ListBoxImp*)m_pImpl)->GetSelItem(nIndexSel);
+  return static_cast<CFWL_ListBoxImp*>(GetImpl())->GetSelItem(nIndexSel);
 }
 int32_t IFWL_ListBox::GetSelIndex(int32_t nIndex) {
-  return ((CFWL_ListBoxImp*)m_pImpl)->GetSelIndex(nIndex);
+  return static_cast<CFWL_ListBoxImp*>(GetImpl())->GetSelIndex(nIndex);
 }
 FWL_ERR IFWL_ListBox::SetSelItem(FWL_HLISTITEM hItem, FX_BOOL bSelect) {
-  return ((CFWL_ListBoxImp*)m_pImpl)->SetSelItem(hItem, bSelect);
+  return static_cast<CFWL_ListBoxImp*>(GetImpl())->SetSelItem(hItem, bSelect);
 }
 FWL_ERR IFWL_ListBox::GetItemText(FWL_HLISTITEM hItem, CFX_WideString& wsText) {
-  return ((CFWL_ListBoxImp*)m_pImpl)->GetItemText(hItem, wsText);
+  return static_cast<CFWL_ListBoxImp*>(GetImpl())->GetItemText(hItem, wsText);
 }
 FWL_ERR IFWL_ListBox::GetScrollPos(FX_FLOAT& fPos, FX_BOOL bVert) {
-  return ((CFWL_ListBoxImp*)m_pImpl)->GetScrollPos(fPos, bVert);
+  return static_cast<CFWL_ListBoxImp*>(GetImpl())->GetScrollPos(fPos, bVert);
 }
 FWL_ERR* IFWL_ListBox::Sort(IFWL_ListBoxCompare* pCom) {
-  return ((CFWL_ListBoxImp*)m_pImpl)->Sort(pCom);
+  return static_cast<CFWL_ListBoxImp*>(GetImpl())->Sort(pCom);
 }
 CFWL_ListBoxImp::CFWL_ListBoxImp(IFWL_Widget* pOuter)
     : CFWL_WidgetImp(pOuter),