Fixup CPDFSDK_PageView and CPDF_Page interactions.

fpdfsdk/javascript/Field.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 "fpdfsdk/javascript/Field.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 242 matching lines @@
 std::vector<CPDF_FormField*> Field::GetFormFields(
     const CFX_WideString& csFieldName) const {
   return Field::GetFormFields(m_pDocument, csFieldName);
 }
 
 void Field::UpdateFormField(CPDFSDK_Document* pDocument,
                             CPDF_FormField* pFormField,
                             FX_BOOL bChangeMark,
                             FX_BOOL bResetAP,
                             FX_BOOL bRefresh) {
-  std::vector<CPDFSDK_Widget*> widgets;
   CPDFSDK_InterForm* pInterForm = pDocument->GetInterForm();
-  pInterForm->GetWidgets(pFormField, &widgets);
 
   if (bResetAP) {
+    std::vector<CPDFSDK_Widget*> widgets;
+    pInterForm->GetWidgets(pFormField, &widgets);
+
     int nFieldType = pFormField->GetFieldType();
     if (nFieldType == FIELDTYPE_COMBOBOX || nFieldType == FIELDTYPE_TEXTFIELD) {
       for (CPDFSDK_Annot* pAnnot : widgets) {
         FX_BOOL bFormatted = FALSE;
         CPDFSDK_Widget* pWidget = static_cast<CPDFSDK_Widget*>(pAnnot);
         CPDFSDK_Widget::Observer observer(&pAnnot);
         CFX_WideString sValue = pWidget->OnFormat(bFormatted);
         if (pAnnot) {
           pWidget->ResetAppearance(bFormatted ? sValue.c_str() : nullptr,
                                    FALSE);
         }
       }
     } else {
       for (CPDFSDK_Widget* pWidget : widgets) {
         pWidget->ResetAppearance(nullptr, FALSE);
       }
     }
   }
 
   if (bRefresh) {
+    // Refresh the widget list. The calls in |bResetAP| may have caused widgets
+    // to be removed from the list. We need to call |GetWidgets| again to be
+    // sure none of the widgets have been deleted.
+    std::vector<CPDFSDK_Widget*> widgets;
+    pInterForm->GetWidgets(pFormField, &widgets);
+
     for (CPDFSDK_Widget* pWidget : widgets) {
       CPDFSDK_Document* pDoc = pWidget->GetInterForm()->GetDocument();
       pDoc->UpdateAllViews(nullptr, pWidget);
     }
   }
 
   if (bChangeMark)
     pDocument->SetChangeMark();
 }
 
@@ skipping 3173 matching lines @@
   }
 }
 
 void Field::AddField(CPDFSDK_Document* pDocument,
                      int nPageIndex,
                      int nFieldType,
                      const CFX_WideString& sName,
                      const CFX_FloatRect& rcCoords) {
   // Not supported.
 }