Add opaque "layout item" to widgets for caller's use.

xfa/fwl/lightwidget/cfwl_widget.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_widget.h"
 
 #include "xfa/fde/tto/fde_textout.h"
 #include "xfa/fwl/core/cfwl_themetext.h"
@@ skipping 106 matching lines @@
     return 0;
   return m_pIface->GetStylesEx();
 }
 
 FWL_Error CFWL_Widget::ModifyStylesEx(uint32_t dwStylesExAdded,
                                       uint32_t dwStylesExRemoved) {
   return m_pIface->ModifyStylesEx(dwStylesExAdded, dwStylesExRemoved);
 }
 
 uint32_t CFWL_Widget::GetStates() {
-  if (!m_pIface)
-    return 0;
-  return m_pIface->GetStates();
+  return m_pIface ? m_pIface->GetStates() : 0;
 }
 
 void CFWL_Widget::SetStates(uint32_t dwStates, FX_BOOL bSet) {
   if (m_pIface)
     m_pIface->SetStates(dwStates, bSet);
 }
 
+void* CFWL_Widget::GetLayoutItem() const {
+  return m_pIface ? m_pIface->GetLayoutItem() : nullptr;
+}
+
+void CFWL_Widget::SetLayoutItem(void* pItem) {
+  if (m_pIface)
+    m_pIface->SetLayoutItem(pItem);
+}
+
 FWL_Error CFWL_Widget::SetPrivateData(void* module_id,
                                       void* pData,
                                       PD_CALLBACK_FREEDATA callback) {
   if (!m_pIface)
     return FWL_Error::Indefinite;
   return m_pIface->SetPrivateData(module_id, pData, callback);
 }
 
 void* CFWL_Widget::GetPrivateData(void* module_id) {
   if (!m_pIface)
@@ skipping 187 matching lines @@
   calPart.m_iTTOAlign = FDE_TTOALIGNMENT_TopLeft;
   CFX_RectF rect;
   FX_FLOAT fWidth = bMultiLine
                         ? (iLineWidth > 0 ? (FX_FLOAT)iLineWidth
                                           : FWL_WGT_CalcMultiLineDefWidth)
                         : FWL_WGT_CalcWidth;
   rect.Set(0, 0, fWidth, FWL_WGT_CalcHeight);
   pTheme->CalcTextRect(&calPart, rect);
   return CFX_SizeF(rect.width, rect.height);
 }