Change IFWL_Widget to store a single delegate.

xfa/fxfa/app/cxfa_ffnumericeditdelegate.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_ffnumericeditdelegate.h"
+
+#include "xfa/fwl/core/ifwl_edit.h"
+#include "xfa/fxfa/app/xfa_fffield.h"
+#include "xfa/fxfa/app/xfa_fftextedit.h"
+
+CXFA_FFNumericEditDelegate::CXFA_FFNumericEditDelegate(
+    std::unique_ptr<IFWL_WidgetDelegate> pDelegate,
+    CXFA_FFNumericEdit* const pWidget)
+    : CXFA_FFTextEditDelegate(std::move(pDelegate), pWidget) {}
+
+CXFA_FFNumericEditDelegate::~CXFA_FFNumericEditDelegate() {}
+
+void CXFA_FFNumericEditDelegate::OnProcessEvent(CFWL_Event* pEvent) {
+  if (pEvent->GetClassID() == CFWL_EventType::Validate) {
+    CFWL_EvtEdtValidate* event = static_cast<CFWL_EvtEdtValidate*>(pEvent);
+    CXFA_FFNumericEdit* widget = static_cast<CXFA_FFNumericEdit*>(m_pWidget);
+    CFX_WideString wsChange = event->wsInsert;
+    event->bValidate =
+        widget->OnValidate(widget->GetNormalWidget()->GetWidget(), wsChange);
+    return;
+  }
+  CXFA_FFTextEditDelegate::OnProcessEvent(pEvent);
+}