Change IFWL_Widget to store a single delegate.

xfa/fxfa/app/cxfa_ffcheckbuttondelegate.cpp

Index: xfa/fxfa/app/cxfa_ffcheckbuttondelegate.cpp
diff --git a/xfa/fxfa/app/cxfa_ffcheckbuttondelegate.cpp b/xfa/fxfa/app/cxfa_ffcheckbuttondelegate.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..24faee605e29e2348da6cffa45b6115c30e947e7
--- /dev/null
+++ b/xfa/fxfa/app/cxfa_ffcheckbuttondelegate.cpp
@@ -0,0 +1,66 @@
+// Copyright 2016 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/cxfa_ffcheckbuttondelegate.h"
+
+#include "xfa/fxfa/cxfa_eventparam.h"
+#include "xfa/fxfa/xfa_ffdocview.h"
+#include "xfa/fxfa/app/xfa_ffcheckbutton.h"
+
+CXFA_FFCheckButtonDelegate::CXFA_FFCheckButtonDelegate(
+    std::unique_ptr<IFWL_WidgetDelegate> pDelegate,
+    CXFA_FFCheckButton* const pWidget)
+    : CXFA_FFFieldDelegate(std::move(pDelegate), pWidget) {}
+
+CXFA_FFCheckButtonDelegate::~CXFA_FFCheckButtonDelegate() {}
+
+void CXFA_FFCheckButtonDelegate::OnProcessMessage(CFWL_Message* pMessage) {
+  m_pDelegate->OnProcessMessage(pMessage);
+}
+
+void CXFA_FFCheckButtonDelegate::OnProcessEvent(CFWL_Event* pEvent) {
+  CXFA_FFFieldDelegate::OnProcessEvent(pEvent);
+
+  CXFA_FFCheckButton* widget = static_cast<CXFA_FFCheckButton*>(m_pWidget);
+  switch (pEvent->GetClassID()) {
+    case CFWL_EventType::CheckStateChanged: {
+      CXFA_EventParam eParam;
+      eParam.m_eType = XFA_EVENT_Change;
+      m_pWidget->GetDataAcc()->GetValue(eParam.m_wsNewText,
+                                        XFA_VALUEPICTURE_Raw);
+      CXFA_WidgetAcc* pFFExclGroup = m_pWidget->GetDataAcc()->GetExclGroup();
+      if (widget->ProcessCommittedData()) {
+        eParam.m_pTarget = pFFExclGroup;
+        if (pFFExclGroup) {
+          m_pWidget->GetDocView()->AddValidateWidget(pFFExclGroup);
+          m_pWidget->GetDocView()->AddCalculateWidgetAcc(pFFExclGroup);
+          pFFExclGroup->ProcessEvent(XFA_ATTRIBUTEENUM_Change, &eParam);
+        }
+        eParam.m_pTarget = m_pWidget->GetDataAcc();
+        m_pWidget->GetDataAcc()->ProcessEvent(XFA_ATTRIBUTEENUM_Change,
+                                              &eParam);
+      } else {
+        widget->SetFWLCheckState(m_pWidget->GetDataAcc()->GetCheckState());
+      }
+
+      if (pFFExclGroup) {
+        eParam.m_pTarget = pFFExclGroup;
+        pFFExclGroup->ProcessEvent(XFA_ATTRIBUTEENUM_Click, &eParam);
+      }
+      eParam.m_pTarget = m_pWidget->GetDataAcc();
+      m_pWidget->GetDataAcc()->ProcessEvent(XFA_ATTRIBUTEENUM_Click, &eParam);
+      break;
+    }
+    default:
+      break;
+  }
+  m_pDelegate->OnProcessEvent(pEvent);
+}
+
+void CXFA_FFCheckButtonDelegate::OnDrawWidget(CFX_Graphics* pGraphics,
+                                              const CFX_Matrix* pMatrix) {
+  m_pDelegate->OnDrawWidget(pGraphics, pMatrix);
+}