Split fwl/core class pt I.

xfa/fwl/core/cfwl_listbox.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/cfwl_listbox.h"
 
 #include <memory>
 
 #include "third_party/base/ptr_util.h"
 #include "third_party/base/stl_util.h"
+#include "xfa/fwl/core/ifwl_listbox.h"
 
 namespace {
 
 IFWL_ListBox* ToListBox(IFWL_Widget* widget) {
   return static_cast<IFWL_ListBox*>(widget);
 }
 
 }  // namespace
 
 CFWL_ListBox::CFWL_ListBox(const IFWL_App* app) : CFWL_Widget(app) {}
@@ skipping 155 matching lines @@
 uint32_t CFWL_ListBox::GetItemCheckState(IFWL_Widget* pWidget,
                                          CFWL_ListItem* pItem) {
   return static_cast<CFWL_ListItem*>(pItem)->m_dwCheckState;
 }
 
 void CFWL_ListBox::SetItemCheckState(IFWL_Widget* pWidget,
                                      CFWL_ListItem* pItem,
                                      uint32_t dwCheckState) {
   static_cast<CFWL_ListItem*>(pItem)->m_dwCheckState = dwCheckState;
 }