Change IFWL_Widget to store a single delegate.

xfa/fxfa/app/xfa_fftextedit.cpp

Index: xfa/fxfa/app/xfa_fftextedit.cpp
diff --git a/xfa/fxfa/app/xfa_fftextedit.cpp b/xfa/fxfa/app/xfa_fftextedit.cpp
index e268f1c4ec44cf4e2def269c0206b249d0ccb9d6..f4d82e774ee2e753b3da29a5e286582dc7e9c92a 100644
--- a/xfa/fxfa/app/xfa_fftextedit.cpp
+++ b/xfa/fxfa/app/xfa_fftextedit.cpp
@@ -8,11 +8,15 @@
 
 #include <vector>
 
+#include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/cfwl_datetimepicker.h"
 #include "xfa/fwl/core/cfwl_edit.h"
 #include "xfa/fwl/core/cfwl_message.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
 #include "xfa/fwl/core/ifwl_edit.h"
+#include "xfa/fxfa/app/cxfa_ffdatetimeeditdelegate.h"
+#include "xfa/fxfa/app/cxfa_ffnumericeditdelegate.h"
+#include "xfa/fxfa/app/cxfa_fftexteditdelegate.h"
 #include "xfa/fxfa/app/xfa_fffield.h"
 #include "xfa/fxfa/app/xfa_fwladapter.h"
 #include "xfa/fxfa/app/xfa_textlayout.h"
@@ -26,7 +30,7 @@
 
 CXFA_FFTextEdit::CXFA_FFTextEdit(CXFA_FFPageView* pPageView,
                                  CXFA_WidgetAcc* pDataAcc)
-    : CXFA_FFField(pPageView, pDataAcc), m_pOldDelegate(nullptr) {}
+    : CXFA_FFField(pPageView, pDataAcc) {}
 
 CXFA_FFTextEdit::~CXFA_FFTextEdit() {
   if (m_pNormalWidget) {
@@ -46,8 +50,8 @@ FX_BOOL CXFA_FFTextEdit::LoadWidget() {
   CFWL_NoteDriver* pNoteDriver = pWidget->GetOwnerApp()->GetNoteDriver();
   pNoteDriver->RegisterEventTarget(pWidget, pWidget);
 
-  m_pOldDelegate = m_pNormalWidget->GetCurrentDelegate();
-  m_pNormalWidget->SetCurrentDelegate(this);
+  m_pNormalWidget->SetDelegate(pdfium::MakeUnique<CXFA_FFTextEditDelegate>(
+      m_pNormalWidget->ReleaseDelegate(), this));
   m_pNormalWidget->LockUpdate();
 
   UpdateWidgetProperty();
@@ -398,49 +402,12 @@ FX_BOOL CXFA_FFTextEdit::CheckWord(const CFX_ByteStringC& sWord) {
   return FALSE;
 }
 
-void CXFA_FFTextEdit::OnProcessMessage(CFWL_Message* pMessage) {
-  m_pOldDelegate->OnProcessMessage(pMessage);
-}
-
-void CXFA_FFTextEdit::OnProcessEvent(CFWL_Event* pEvent) {
-  CXFA_FFField::OnProcessEvent(pEvent);
-  switch (pEvent->GetClassID()) {
-    case CFWL_EventType::TextChanged: {
-      CFWL_EvtEdtTextChanged* event = (CFWL_EvtEdtTextChanged*)pEvent;
-      CFX_WideString wsChange;
-      OnTextChanged(m_pNormalWidget->GetWidget(), wsChange, event->wsPrevText);
-      break;
-    }
-    case CFWL_EventType::TextFull: {
-      OnTextFull(m_pNormalWidget->GetWidget());
-      break;
-    }
-    case CFWL_EventType::CheckWord: {
-      CFX_WideString wstr(L"FWL_EVENT_DTP_SelectChanged");
-      CFWL_EvtEdtCheckWord* event = (CFWL_EvtEdtCheckWord*)pEvent;
-      event->bCheckWord = CheckWord(event->bsWord.AsStringC());
-      break;
-    }
-    case CFWL_EventType::GetSuggestedWords: {
-      CFWL_EvtEdtGetSuggestWords* event = (CFWL_EvtEdtGetSuggestWords*)pEvent;
-      event->bSuggestWords = FALSE;
-      break;
-    }
-    default:
-      break;
-  }
-  m_pOldDelegate->OnProcessEvent(pEvent);
-}
-
-void CXFA_FFTextEdit::OnDrawWidget(CFX_Graphics* pGraphics,
-                                   const CFX_Matrix* pMatrix) {
-  m_pOldDelegate->OnDrawWidget(pGraphics, pMatrix);
-}
-
 CXFA_FFNumericEdit::CXFA_FFNumericEdit(CXFA_FFPageView* pPageView,
                                        CXFA_WidgetAcc* pDataAcc)
     : CXFA_FFTextEdit(pPageView, pDataAcc) {}
+
 CXFA_FFNumericEdit::~CXFA_FFNumericEdit() {}
+
 FX_BOOL CXFA_FFNumericEdit::LoadWidget() {
   CFWL_Edit* pWidget = new CFWL_Edit(GetFWLApp());
   pWidget->Initialize();
@@ -451,8 +418,8 @@ FX_BOOL CXFA_FFNumericEdit::LoadWidget() {
   CFWL_NoteDriver* pNoteDriver = pIWidget->GetOwnerApp()->GetNoteDriver();
   pNoteDriver->RegisterEventTarget(pIWidget, pIWidget);
 
-  m_pOldDelegate = m_pNormalWidget->GetCurrentDelegate();
-  m_pNormalWidget->SetCurrentDelegate(this);
+  m_pNormalWidget->SetDelegate(pdfium::MakeUnique<CXFA_FFNumericEditDelegate>(
+      m_pNormalWidget->ReleaseDelegate(), this));
   m_pNormalWidget->LockUpdate();
 
   CFX_WideString wsText;
@@ -488,16 +455,6 @@ void CXFA_FFNumericEdit::UpdateWidgetProperty() {
   m_pNormalWidget->ModifyStylesEx(dwExtendedStyle, 0xFFFFFFFF);
 }
 
-void CXFA_FFNumericEdit::OnProcessEvent(CFWL_Event* pEvent) {
-  if (pEvent->GetClassID() == CFWL_EventType::Validate) {
-    CFWL_EvtEdtValidate* event = (CFWL_EvtEdtValidate*)pEvent;
-    CFX_WideString wsChange = event->wsInsert;
-    event->bValidate = OnValidate(m_pNormalWidget->GetWidget(), wsChange);
-    return;
-  }
-  CXFA_FFTextEdit::OnProcessEvent(pEvent);
-}
-
 FX_BOOL CXFA_FFNumericEdit::OnValidate(IFWL_Widget* pWidget,
                                        CFX_WideString& wsText) {
   CFX_WideString wsPattern;
@@ -531,8 +488,8 @@ FX_BOOL CXFA_FFPasswordEdit::LoadWidget() {
   CFWL_NoteDriver* pNoteDriver = pIWidget->GetOwnerApp()->GetNoteDriver();
   pNoteDriver->RegisterEventTarget(pIWidget, pIWidget);
 
-  m_pOldDelegate = m_pNormalWidget->GetCurrentDelegate();
-  m_pNormalWidget->SetCurrentDelegate(this);
+  m_pNormalWidget->SetDelegate(pdfium::MakeUnique<CXFA_FFTextEditDelegate>(
+      m_pNormalWidget->ReleaseDelegate(), this));
   m_pNormalWidget->LockUpdate();
 
   CFX_WideString wsText;
@@ -600,8 +557,8 @@ FX_BOOL CXFA_FFDateTimeEdit::LoadWidget() {
   CFWL_NoteDriver* pNoteDriver = pIWidget->GetOwnerApp()->GetNoteDriver();
   pNoteDriver->RegisterEventTarget(pIWidget, pIWidget);
 
-  m_pOldDelegate = m_pNormalWidget->GetCurrentDelegate();
-  m_pNormalWidget->SetCurrentDelegate(this);
+  m_pNormalWidget->SetDelegate(pdfium::MakeUnique<CXFA_FFDateTimeEditDelegate>(
+      m_pNormalWidget->ReleaseDelegate(), this));
   m_pNormalWidget->LockUpdate();
 
   CFX_WideString wsText;
@@ -798,13 +755,3 @@ void CXFA_FFDateTimeEdit::OnSelectChanged(IFWL_Widget* pWidget,
   m_pDataAcc->GetValue(eParam.m_wsNewText, XFA_VALUEPICTURE_Raw);
   m_pDataAcc->ProcessEvent(XFA_ATTRIBUTEENUM_Change, &eParam);
 }
-
-void CXFA_FFDateTimeEdit::OnProcessEvent(CFWL_Event* pEvent) {
-  if (pEvent->GetClassID() == CFWL_EventType::SelectChanged) {
-    CFWL_Event_DtpSelectChanged* event = (CFWL_Event_DtpSelectChanged*)pEvent;
-    OnSelectChanged(m_pNormalWidget->GetWidget(), event->iYear, event->iMonth,
-                    event->iDay);
-    return;
-  }
-  CXFA_FFTextEdit::OnProcessEvent(pEvent);
-}