Change IFWL_Widget to store a single delegate.

xfa/fwl/core/ifwl_datetimepicker.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/core/ifwl_datetimepicker.h"
 
 #include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/cfwl_message.h"
@@ skipping 502 matching lines @@
     if (m_iYear > 0 && m_iMonth > 0 && m_iDay > 0) {
       m_pMonthCal->SetSelect(m_iYear, m_iMonth, m_iDay);
     }
     m_pMonthCal->Update();
   }
   m_pMonthCal->SetStates(FWL_WGTSTATE_Invisible, !bActivate);
   if (bActivate) {
     CFWL_MsgSetFocus msg;
     msg.m_pDstTarget = m_pMonthCal.get();
     msg.m_pSrcTarget = m_pEdit.get();
-    m_pEdit->GetCurrentDelegate()->OnProcessMessage(&msg);
+    m_pEdit->GetDelegate()->OnProcessMessage(&msg);
   }
   CFX_RectF rtInvalidate, rtCal;
   rtInvalidate.Set(0, 0, m_pProperties->m_rtWidget.width,
                    m_pProperties->m_rtWidget.height);
   m_pMonthCal->GetWidgetRect(rtCal);
   rtInvalidate.Union(rtCal);
   rtInvalidate.Inflate(2, 2);
   Repaint(&rtInvalidate);
 }
 
@@ skipping 145 matching lines @@
           OnMouseLeave(pMouse);
           break;
         }
         default:
           break;
       }
       break;
     }
     case CFWL_MessageType::Key: {
       if (m_pOwner->m_pEdit->GetStates() & FWL_WGTSTATE_Focused) {
-        m_pOwner->m_pEdit->GetCurrentDelegate()->OnProcessMessage(pMessage);
+        m_pOwner->m_pEdit->GetDelegate()->OnProcessMessage(pMessage);
         return;
       }
       break;
     }
     default:
       break;
   }
 
   CFWL_WidgetImpDelegate::OnProcessMessage(pMessage);
 }
@@ skipping 82 matching lines @@
   if (bSet) {
     m_pOwner->m_pProperties->m_dwStates |= FWL_WGTSTATE_Focused;
     if (m_pOwner->m_pEdit &&
         !(m_pOwner->m_pEdit->GetStylesEx() & FWL_STYLEEXT_EDT_ReadOnly)) {
       m_pOwner->m_rtBtn.Set(m_pOwner->m_pProperties->m_rtWidget.width, 0,
                             m_pOwner->m_fBtn,
                             m_pOwner->m_pProperties->m_rtWidget.height - 1);
     }
     rtInvalidate = m_pOwner->m_rtBtn;
     pMsg->m_pDstTarget = m_pOwner->m_pEdit.get();
-    m_pOwner->m_pEdit->GetCurrentDelegate()->OnProcessMessage(pMsg);
+    m_pOwner->m_pEdit->GetDelegate()->OnProcessMessage(pMsg);
   } else {
     m_pOwner->m_pProperties->m_dwStates &= ~FWL_WGTSTATE_Focused;
     m_pOwner->m_rtBtn.Set(0, 0, 0, 0);
     if (m_pOwner->DisForm_IsMonthCalendarShowed()) {
       m_pOwner->ShowMonthCalendar(FALSE);
     }
     if (m_pOwner->m_pEdit->GetStates() & FWL_WGTSTATE_Focused) {
       pMsg->m_pSrcTarget = m_pOwner->m_pEdit.get();
-      m_pOwner->m_pEdit->GetCurrentDelegate()->OnProcessMessage(pMsg);
+      m_pOwner->m_pEdit->GetDelegate()->OnProcessMessage(pMsg);
     }
   }
   rtInvalidate.Inflate(2, 2);
   m_pOwner->Repaint(&rtInvalidate);
 }
 
 IFWL_DateTimePicker::CFWL_MonthCalendarImpDP::CFWL_MonthCalendarImpDP() {
   m_iCurYear = 2010;
   m_iCurMonth = 3;
   m_iCurDay = 29;
@@ skipping 12 matching lines @@
 
 int32_t IFWL_DateTimePicker::CFWL_MonthCalendarImpDP::GetCurMonth(
     IFWL_Widget* pWidget) {
   return m_iCurMonth;
 }
 
 int32_t IFWL_DateTimePicker::CFWL_MonthCalendarImpDP::GetCurYear(
     IFWL_Widget* pWidget) {
   return m_iCurYear;
 }