Add flag to notify if a node widget is ready

This CL updates CXFA_Object to have a flag which annotates if the node
is ready. Ready means that we've gone through the OnNodeReady call in
CXFA_FFNotify. Previously we'd check if the WidgetAcc exists on the node
which is created in OnNodeReady.

This CL replaces all the points where we check for a WidgetAcc existing
with a IsWidgetReady() call.

Change-Id: I54e8160269c3104cdae7a516c1814c13bee15130
Reviewed-on: https://pdfium-review.googlesource.com/23190
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

4 files changed, 15 insertions, 9 deletions

diff --git a/xfa/fxfa/parser/cxfa_node.cpp b/xfa/fxfa/parser/cxfa_node.cpp
index ec70271ea0..1d2af4c858 100644
--- a/xfa/fxfa/parser/cxfa_node.cpp
+++ b/xfa/fxfa/parser/cxfa_node.cpp
@@ -586,7 +586,8 @@ CXFA_WidgetAcc* CXFA_Node::GetContainerWidgetAcc() {
     for (const auto& pFormNode : *(pDataNode->GetBindItems())) {
       if (!pFormNode || pFormNode->HasRemovedChildren())
         continue;
-      pFieldWidgetAcc = pFormNode->GetWidgetAcc();
+      pFieldWidgetAcc =
+          pFormNode->IsWidgetReady() ? pFormNode->GetWidgetAcc() : nullptr;
       if (pFieldWidgetAcc) {
         wsPicture =
             pFieldWidgetAcc->GetPictureContent(XFA_VALUEPICTURE_DataBind);
diff --git a/xfa/fxfa/parser/cxfa_object.cpp b/xfa/fxfa/parser/cxfa_object.cpp
index 7c73db0ff5..0c866d350a 100644
--- a/xfa/fxfa/parser/cxfa_object.cpp
+++ b/xfa/fxfa/parser/cxfa_object.cpp
@@ -56,8 +56,9 @@ const CXFA_TreeList* CXFA_Object::AsTreeList() const {
   return IsTreeList() ? static_cast<const CXFA_TreeList*>(this) : nullptr;
 }
 
-void CXFA_Object::CreateWidgetAcc() {
+void CXFA_Object::SetWidgetReady() {
   acc_ = pdfium::MakeUnique<CXFA_WidgetAcc>(AsNode());
+  is_widget_ready_ = true;
 }
 
 CXFA_Node* ToNode(CXFA_Object* pObj) {
diff --git a/xfa/fxfa/parser/cxfa_object.h b/xfa/fxfa/parser/cxfa_object.h
index 5d5f31c647..3843aafb33 100644
--- a/xfa/fxfa/parser/cxfa_object.h
+++ b/xfa/fxfa/parser/cxfa_object.h
@@ -78,8 +78,13 @@ class CXFA_Object : public CFXJSE_HostObject {
            m_elementType == XFA_Element::Subform ||
            m_elementType == XFA_Element::ExclGroup;
   }
-  void CreateWidgetAcc();
-  CXFA_WidgetAcc* GetWidgetAcc() { return acc_.get(); }
+  void SetWidgetReady();
+  bool IsWidgetReady() const { return is_widget_ready_; }
+  CXFA_WidgetAcc* GetWidgetAcc() {
+    ASSERT(IsWidgetReady());
+    ASSERT(acc_.get() != nullptr);
+    return acc_.get();
+  }
 
   XFA_Element GetElementType() const { return m_elementType; }
   WideStringView GetClassName() const { return m_elementName; }
@@ -97,7 +102,7 @@ class CXFA_Object : public CFXJSE_HostObject {
   UnownedPtr<CXFA_Document> const m_pDocument;
   const XFA_ObjectType m_objectType;
   const XFA_Element m_elementType;
-
+  bool is_widget_ready_ = false;
   const uint32_t m_elementNameHash;
   const WideStringView m_elementName;
 
diff --git a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
index f6f165fe59..422ba4e58a 100644
--- a/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
+++ b/xfa/fxfa/parser/xfa_document_datamerger_imp.cpp
@@ -70,9 +70,8 @@ CXFA_Node* FormValueNode_CreateChild(CXFA_Node* pValueNode, XFA_Element iType) {
 }
 
 void FormValueNode_MatchNoneCreateChild(CXFA_Node* pFormNode) {
-  CXFA_WidgetAcc* pWidgetAcc = pFormNode->GetWidgetAcc();
-  ASSERT(pWidgetAcc);
-  pWidgetAcc->GetUIType();
+  ASSERT(pFormNode->IsWidgetReady());
+  pFormNode->GetWidgetAcc()->GetUIType();
 }
 
 bool FormValueNode_SetChildContent(CXFA_Node* pValueNode,
@@ -132,8 +131,8 @@ void CreateDataBinding(CXFA_Node* pFormNode,
   if (eType != XFA_Element::Field && eType != XFA_Element::ExclGroup)
     return;
 
+  ASSERT(pFormNode->IsWidgetReady());
   CXFA_WidgetAcc* pWidgetAcc = pFormNode->GetWidgetAcc();
-  ASSERT(pWidgetAcc);
   XFA_Element eUIType = pWidgetAcc->GetUIType();
   auto* defValue = pFormNode->JSObject()->GetOrCreateProperty<CXFA_Value>(
       0, XFA_Element::Value);