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

xfa/fxfa/app/xfa_ffcheckbutton.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/fxfa/app/xfa_ffcheckbutton.h"
 
 #include "xfa/fwl/core/cfwl_message.h"
 #include "xfa/fwl/core/cfwl_widgetmgr.h"
@@ skipping 10 matching lines @@
 CXFA_FFCheckButton::CXFA_FFCheckButton(CXFA_FFPageView* pPageView,
                                        CXFA_WidgetAcc* pDataAcc)
     : CXFA_FFField(pPageView, pDataAcc), m_pOldDelegate(NULL) {
   m_rtCheckBox.Set(0, 0, 0, 0);
 }
 CXFA_FFCheckButton::~CXFA_FFCheckButton() {}
 FX_BOOL CXFA_FFCheckButton::LoadWidget() {
   CFWL_CheckBox* pCheckBox = CFWL_CheckBox::Create();
   pCheckBox->Initialize();
   m_pNormalWidget = pCheckBox;
+  m_pNormalWidget->SetLayoutItem(this);
   IFWL_Widget* pWidget = m_pNormalWidget->GetWidget();
-  m_pNormalWidget->SetPrivateData(pWidget, this, NULL);
   CFWL_NoteDriver* pNoteDriver = FWL_GetApp()->GetNoteDriver();
   pNoteDriver->RegisterEventTarget(pWidget, pWidget);
   m_pOldDelegate = m_pNormalWidget->SetDelegate(this);
   if (m_pDataAcc->IsRadioButton()) {
     pCheckBox->ModifyStylesEx(FWL_STYLEEXT_CKB_RadioButton, 0xFFFFFFFF);
   }
-  m_pNormalWidget = (CFWL_Widget*)pCheckBox;
-  m_pNormalWidget->SetPrivateData(m_pNormalWidget->GetWidget(), this, NULL);
   m_pNormalWidget->LockUpdate();
   UpdateWidgetProperty();
-  XFA_CHECKSTATE eState = m_pDataAcc->GetCheckState();
-  SetFWLCheckState(eState);
+  SetFWLCheckState(m_pDataAcc->GetCheckState());
   m_pNormalWidget->UnlockUpdate();
   return CXFA_FFField::LoadWidget();
 }
 void CXFA_FFCheckButton::UpdateWidgetProperty() {
   CFWL_CheckBox* pCheckBox = (CFWL_CheckBox*)m_pNormalWidget;
   if (!m_pNormalWidget) {
     return;
   }
   FX_FLOAT fSize = m_pDataAcc->GetCheckButtonSize();
   pCheckBox->SetBoxSize(fSize);
@@ skipping 276 matching lines @@
     default:
       break;
   }
   m_pOldDelegate->OnProcessEvent(pEvent);
 }
 
 void CXFA_FFCheckButton::OnDrawWidget(CFX_Graphics* pGraphics,
                                       const CFX_Matrix* pMatrix) {
   m_pOldDelegate->OnDrawWidget(pGraphics, pMatrix);
 }