Use virtual function to retrieve interface pointer

xfa/fwl/lightwidget/cfwl_edit.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/lightwidget/cfwl_edit.h"
 
 #include <memory>
 #include <vector>
 
-#include "xfa/fwl/basewidget/ifwl_edit.h"
+IFWL_Edit* CFWL_Edit::GetWidget() {
+  return static_cast<IFWL_Edit*>(m_pIface.get());
+}
+
+const IFWL_Edit* CFWL_Edit::GetWidget() const {
+  return static_cast<IFWL_Edit*>(m_pIface.get());
+}
 
 CFWL_Edit* CFWL_Edit::Create() {
   return new CFWL_Edit;
 }
 
 FWL_Error CFWL_Edit::Initialize(const CFWL_WidgetProperties* pProperties) {
   if (m_pIface)
     return FWL_Error::Indefinite;
   if (pProperties) {
     *m_pProperties = *pProperties;
   }
   std::unique_ptr<IFWL_Edit> pEdit(IFWL_Edit::Create(
       m_pProperties->MakeWidgetImpProperties(nullptr), nullptr));
   FWL_Error ret = pEdit->Initialize();
   if (ret != FWL_Error::Succeeded) {
     return ret;
   }
-  m_pIface = pEdit.release();
+  m_pIface = std::move(pEdit);
   CFWL_Widget::Initialize();
   return FWL_Error::Succeeded;
 }
 
 FWL_Error CFWL_Edit::SetText(const CFX_WideString& wsText) {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->SetText(wsText);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->SetText(wsText);
 }
 
 int32_t CFWL_Edit::GetTextLength() const {
-  if (!m_pIface)
+  if (!GetWidget())
     return 0;
-  return static_cast<IFWL_Edit*>(m_pIface)->GetTextLength();
+  return GetWidget()->GetTextLength();
 }
 
 FWL_Error CFWL_Edit::GetText(CFX_WideString& wsText,
                              int32_t nStart,
                              int32_t nCount) const {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->GetText(wsText, nStart, nCount);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->GetText(wsText, nStart, nCount);
 }
 
 FWL_Error CFWL_Edit::ClearText() {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->ClearText();
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->ClearText();
 }
 
 int32_t CFWL_Edit::GetCaretPos() const {
-  if (!m_pIface)
-    return -1;
-  return static_cast<IFWL_Edit*>(m_pIface)->GetCaretPos();
+  if (!GetWidget())
+    return -1;
+  return GetWidget()->GetCaretPos();
 }
 
 int32_t CFWL_Edit::SetCaretPos(int32_t nIndex, FX_BOOL bBefore) {
-  if (!m_pIface)
-    return -1;
-  return static_cast<IFWL_Edit*>(m_pIface)->SetCaretPos(nIndex, bBefore);
+  if (!GetWidget())
+    return -1;
+  return GetWidget()->SetCaretPos(nIndex, bBefore);
 }
 
 int32_t CFWL_Edit::AddSelRange(int32_t nStart, int32_t nCount) {
-  if (!m_pIface)
-    return -1;
-  static_cast<IFWL_Edit*>(m_pIface)->AddSelRange(nStart, nCount);
+  if (!GetWidget())
+    return -1;
+  GetWidget()->AddSelRange(nStart, nCount);
   int32_t pos = 0;
-  int32_t sum = static_cast<IFWL_Edit*>(m_pIface)->GetTextLength();
+  int32_t sum = GetWidget()->GetTextLength();
   if (nCount == -1) {
     pos = sum;
   } else {
     pos = nStart + nCount;
   }
-  return static_cast<IFWL_Edit*>(m_pIface)->SetCaretPos(pos);
+  return GetWidget()->SetCaretPos(pos);
 }
 
 int32_t CFWL_Edit::CountSelRanges() {
-  if (!m_pIface)
+  if (!GetWidget())
     return 0;
-  return static_cast<IFWL_Edit*>(m_pIface)->CountSelRanges();
+  return GetWidget()->CountSelRanges();
 }
 
 int32_t CFWL_Edit::GetSelRange(int32_t nIndex, int32_t& nStart) {
-  if (!m_pIface)
+  if (!GetWidget())
     return 0;
-  return static_cast<IFWL_Edit*>(m_pIface)->GetSelRange(nIndex, nStart);
+  return GetWidget()->GetSelRange(nIndex, nStart);
 }
 
 FWL_Error CFWL_Edit::ClearSelections() {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->ClearSelections();
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->ClearSelections();
 }
 
 int32_t CFWL_Edit::GetLimit() {
-  if (!m_pIface)
-    return -1;
-  return static_cast<IFWL_Edit*>(m_pIface)->GetLimit();
+  if (!GetWidget())
+    return -1;
+  return GetWidget()->GetLimit();
 }
 
 FWL_Error CFWL_Edit::SetLimit(int32_t nLimit) {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->SetLimit(nLimit);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->SetLimit(nLimit);
 }
 
 FWL_Error CFWL_Edit::SetAliasChar(FX_WCHAR wAlias) {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->SetAliasChar(wAlias);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->SetAliasChar(wAlias);
 }
 
 FWL_Error CFWL_Edit::Insert(int32_t nStart,
                             const FX_WCHAR* lpText,
                             int32_t nLen) {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->Insert(nStart, lpText, nLen);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->Insert(nStart, lpText, nLen);
 }
 
 FWL_Error CFWL_Edit::DeleteSelections() {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->DeleteSelections();
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->DeleteSelections();
 }
 
 FWL_Error CFWL_Edit::DeleteRange(int32_t nStart, int32_t nCount) {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->DeleteRange(nStart, nCount);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->DeleteRange(nStart, nCount);
 }
 
 FWL_Error CFWL_Edit::Replace(int32_t nStart,
                              int32_t nLen,
                              const CFX_WideStringC& wsReplace) {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->Replace(nStart, nLen, wsReplace);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->Replace(nStart, nLen, wsReplace);
 }
 
 FWL_Error CFWL_Edit::DoClipboard(int32_t iCmd) {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->DoClipboard(iCmd);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->DoClipboard(iCmd);
 }
 
 FX_BOOL CFWL_Edit::Redo(const IFDE_TxtEdtDoRecord* pRecord) {
-  return m_pIface && static_cast<IFWL_Edit*>(m_pIface)->Redo(pRecord);
+  return GetWidget() && GetWidget()->Redo(pRecord);
 }
 
 FX_BOOL CFWL_Edit::Undo(const IFDE_TxtEdtDoRecord* pRecord) {
-  return m_pIface && static_cast<IFWL_Edit*>(m_pIface)->Undo(pRecord);
+  return GetWidget() && GetWidget()->Undo(pRecord);
 }
 
 FWL_Error CFWL_Edit::SetTabWidth(FX_FLOAT fTabWidth, FX_BOOL bEquidistant) {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)
-      ->SetTabWidth(fTabWidth, bEquidistant);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->SetTabWidth(fTabWidth, bEquidistant);
 }
 
 FWL_Error CFWL_Edit::SetNumberRange(int32_t iMin, int32_t iMax) {
   if (iMin > iMax) {
     return FWL_Error::ParameterInvalid;
   }
-  return static_cast<IFWL_Edit*>(m_pIface)->SetNumberRange(iMin, iMax);
+  return GetWidget()->SetNumberRange(iMin, iMax);
 }
 
 FWL_Error CFWL_Edit::SetBackColor(uint32_t dwColor) {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->SetBackColor(dwColor);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->SetBackColor(dwColor);
 }
 
 FWL_Error CFWL_Edit::SetFont(const CFX_WideString& wsFont, FX_FLOAT fSize) {
-  if (!m_pIface)
-    return FWL_Error::Indefinite;
-  return static_cast<IFWL_Edit*>(m_pIface)->SetFont(wsFont, fSize);
+  if (!GetWidget())
+    return FWL_Error::Indefinite;
+  return GetWidget()->SetFont(wsFont, fSize);
 }
 
 FX_BOOL CFWL_Edit::CanUndo() {
-  return static_cast<IFWL_Edit*>(m_pIface)->CanUndo();
+  return GetWidget()->CanUndo();
 }
 
 FX_BOOL CFWL_Edit::CanRedo() {
-  return static_cast<IFWL_Edit*>(m_pIface)->CanRedo();
+  return GetWidget()->CanRedo();
 }
 
 FX_BOOL CFWL_Edit::Undo() {
-  return static_cast<IFWL_Edit*>(m_pIface)->Undo();
+  return GetWidget()->Undo();
 }
 
 FX_BOOL CFWL_Edit::Redo() {
-  return static_cast<IFWL_Edit*>(m_pIface)->Undo();
+  return GetWidget()->Undo();
 }
 
 FX_BOOL CFWL_Edit::Copy(CFX_WideString& wsCopy) {
-  return static_cast<IFWL_Edit*>(m_pIface)->Copy(wsCopy);
+  return GetWidget()->Copy(wsCopy);
 }
 
 FX_BOOL CFWL_Edit::Cut(CFX_WideString& wsCut) {
-  return static_cast<IFWL_Edit*>(m_pIface)->Cut(wsCut);
+  return GetWidget()->Cut(wsCut);
 }
 
 FX_BOOL CFWL_Edit::Paste(const CFX_WideString& wsPaste) {
-  return static_cast<IFWL_Edit*>(m_pIface)->Paste(wsPaste);
+  return GetWidget()->Paste(wsPaste);
 }
 
 FX_BOOL CFWL_Edit::Delete() {
-  return static_cast<IFWL_Edit*>(m_pIface)->Delete();
+  return GetWidget()->Delete();
 }
 
 void CFWL_Edit::SetScrollOffset(FX_FLOAT fScrollOffset) {
-  return static_cast<IFWL_Edit*>(m_pIface)->SetScrollOffset(fScrollOffset);
+  return GetWidget()->SetScrollOffset(fScrollOffset);
 }
 
 FX_BOOL CFWL_Edit::GetSuggestWords(CFX_PointF pointf,
                                    std::vector<CFX_ByteString>& sSuggest) {
-  return static_cast<IFWL_Edit*>(m_pIface)->GetSuggestWords(pointf, sSuggest);
+  return GetWidget()->GetSuggestWords(pointf, sSuggest);
 }
 
 FX_BOOL CFWL_Edit::ReplaceSpellCheckWord(CFX_PointF pointf,
                                          const CFX_ByteStringC& bsReplace) {
-  return static_cast<IFWL_Edit*>(m_pIface)
-      ->ReplaceSpellCheckWord(pointf, bsReplace);
+  return GetWidget()->ReplaceSpellCheckWord(pointf, bsReplace);
 }
 
 CFWL_Edit::CFWL_Edit() {}
 
 CFWL_Edit::~CFWL_Edit() {}