Change IFWL_Widget to store a single delegate.

xfa/fxfa/app/cxfa_fftexteditdelegate.cpp

+// 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_ffdatetimeeditdelegate.h"
+
+#include "xfa/fwl/core/ifwl_edit.h"
+#include "xfa/fxfa/app/xfa_fftextedit.h"
+
+CXFA_FFTextEditDelegate::CXFA_FFTextEditDelegate(
+    std::unique_ptr<IFWL_WidgetDelegate> pDelegate,
+    CXFA_FFTextEdit* const pWidget)
+    : CXFA_FFFieldDelegate(std::move(pDelegate), pWidget) {}
+
+CXFA_FFTextEditDelegate::~CXFA_FFTextEditDelegate() {}
+
+void CXFA_FFTextEditDelegate::OnProcessMessage(CFWL_Message* pMessage) {
+  m_pDelegate->OnProcessMessage(pMessage);
+}
+
+void CXFA_FFTextEditDelegate::OnProcessEvent(CFWL_Event* pEvent) {
+  CXFA_FFFieldDelegate::OnProcessEvent(pEvent);
+
+  CXFA_FFTextEdit* widget = static_cast<CXFA_FFTextEdit*>(m_pWidget);
+
+  switch (pEvent->GetClassID()) {
+    case CFWL_EventType::TextChanged: {
+      CFWL_EvtEdtTextChanged* event =
+          static_cast<CFWL_EvtEdtTextChanged*>(pEvent);
+      CFX_WideString wsChange;
+      widget->OnTextChanged(widget->GetNormalWidget()->GetWidget(), wsChange,
+                            event->wsPrevText);
+      break;
+    }
+    case CFWL_EventType::TextFull: {
+      widget->OnTextFull(widget->GetNormalWidget()->GetWidget());
+      break;
+    }
+    case CFWL_EventType::CheckWord: {
+      CFX_WideString wstr(L"FWL_EVENT_DTP_SelectChanged");
+      CFWL_EvtEdtCheckWord* event = static_cast<CFWL_EvtEdtCheckWord*>(pEvent);
+      event->bCheckWord = widget->CheckWord(event->bsWord.AsStringC());
+      break;
+    }
+    case CFWL_EventType::GetSuggestedWords: {
+      CFWL_EvtEdtGetSuggestWords* event =
+          static_cast<CFWL_EvtEdtGetSuggestWords*>(pEvent);
+      event->bSuggestWords = FALSE;
+      break;
+    }
+    default:
+      break;
+  }
+  m_pDelegate->OnProcessEvent(pEvent);
+}
+
+void CXFA_FFTextEditDelegate::OnDrawWidget(CFX_Graphics* pGraphics,
+                                           const CFX_Matrix* pMatrix) {
+  m_pDelegate->OnDrawWidget(pGraphics, pMatrix);
+}