Change IFWL_Widget to store a single delegate.

xfa/fwl/core/fwl_noteimp.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/fwl_noteimp.h"
 
 #include "core/fxcrt/fx_ext.h"
 #include "third_party/base/stl_util.h"
@@ skipping 126 matching lines @@
   }
   IFWL_Widget* pPrev = m_pFocus;
   m_pFocus = pFocus;
   if (pPrev) {
     CFWL_MsgKillFocus ms;
     ms.m_pDstTarget = pPrev;
     ms.m_pSrcTarget = pPrev;
     if (bNotify) {
       ms.m_dwExtend = 1;
     }
-    if (IFWL_WidgetDelegate* pDelegate = pPrev->GetCurrentDelegate())
+    if (IFWL_WidgetDelegate* pDelegate = pPrev->GetDelegate())
       pDelegate->OnProcessMessage(&ms);
   }
   if (pFocus) {
     IFWL_Widget* pWidget =
         pFocus->GetOwnerApp()->GetWidgetMgr()->GetSystemFormWidget(pFocus);
     IFWL_Form* pForm = static_cast<IFWL_Form*>(pWidget);
     if (pForm)
       pForm->SetSubFocus(pFocus);
 
     CFWL_MsgSetFocus ms;
     ms.m_pDstTarget = pFocus;
     if (bNotify) {
       ms.m_dwExtend = 1;
     }
 
-    if (IFWL_WidgetDelegate* pDelegate = pFocus->GetCurrentDelegate())
+    if (IFWL_WidgetDelegate* pDelegate = pFocus->GetDelegate())
       pDelegate->OnProcessMessage(&ms);
   }
   return TRUE;
 }
 FWL_Error CFWL_NoteDriver::Run() {
 #if (_FX_OS_ == _FX_LINUX_DESKTOP_ || _FX_OS_ == _FX_WIN32_DESKTOP_ || \
      _FX_OS_ == _FX_WIN64_)
   CFWL_NoteLoop* pTopLoop = nullptr;
   for (;;) {
     pTopLoop = GetTopLoop();
@@ skipping 180 matching lines @@
           DoDragFiles(static_cast<CFWL_MsgDropFiles*>(pMessage), pMessageForm);
       break;
     }
     default: {
       bRet = TRUE;
       break;
     }
   }
   if (bRet) {
     if (IFWL_WidgetDelegate* pDelegate =
-            pMessage->m_pDstTarget->GetCurrentDelegate()) {
+            pMessage->m_pDstTarget->GetDelegate()) {
       pDelegate->OnProcessMessage(pMessage);
     }
   }
   return bRet;
 }
 
 FX_BOOL CFWL_NoteDriver::DoActivate(CFWL_MsgActivate* pMsg,
                                     IFWL_Widget* pMessageForm) {
   pMsg->m_pDstTarget = pMessageForm;
   return !!(pMsg->m_pDstTarget->GetStates() & FWL_WGTSTATE_Deactivated);
@@ skipping 325 matching lines @@
 int32_t CFWL_EventTarget::SetEventSource(IFWL_Widget* pSource,
                                          uint32_t dwFilter) {
   if (pSource) {
     m_eventSources.SetAt(pSource, dwFilter);
     return m_eventSources.GetCount();
   }
   return 1;
 }
 
 FX_BOOL CFWL_EventTarget::ProcessEvent(CFWL_Event* pEvent) {
-  IFWL_WidgetDelegate* pDelegate = m_pListener->GetCurrentDelegate();
+  IFWL_WidgetDelegate* pDelegate = m_pListener->GetDelegate();
   if (!pDelegate)
     return FALSE;
   if (m_eventSources.GetCount() == 0) {
     pDelegate->OnProcessEvent(pEvent);
     return TRUE;
   }
   FX_POSITION pos = m_eventSources.GetStartPosition();
   while (pos) {
     IFWL_Widget* pSource = nullptr;
     uint32_t dwFilter = 0;
@@ skipping 48 matching lines @@
   if (!s_pInstance)
     s_pInstance = new CFWL_ToolTipContainer;
   return s_pInstance;
 }
 
 // static
 void CFWL_ToolTipContainer::DeleteInstance() {
   delete s_pInstance;
   s_pInstance = nullptr;
 }