Keep track of fixed positioning in accessibility tree.

ui/accessibility/ax_node_data.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/accessibility/ax_node_data.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <set>
@@ skipping 183 matching lines @@
 
   NOTREACHED();
   return false;
 }
 
 AXNodeData::AXNodeData()
     : id(-1),
       role(AX_ROLE_UNKNOWN),
       state(AX_STATE_NONE),
       actions(AX_ACTION_NONE),
-      offset_container_id(-1) {}
+      offset_container_id(-1),
+      is_fixed_positioned(false) {}
 
 AXNodeData::~AXNodeData() {
 }
 
 AXNodeData::AXNodeData(const AXNodeData& other) {
   id = other.id;
   role = other.role;
   state = other.state;
   actions = other.actions;
   string_attributes = other.string_attributes;
   int_attributes = other.int_attributes;
   float_attributes = other.float_attributes;
   bool_attributes = other.bool_attributes;
   intlist_attributes = other.intlist_attributes;
   stringlist_attributes = other.stringlist_attributes;
   html_attributes = other.html_attributes;
   child_ids = other.child_ids;
   location = other.location;
   offset_container_id = other.offset_container_id;
   if (other.transform)
     transform.reset(new gfx::Transform(*other.transform));
+  is_fixed_positioned = other.is_fixed_positioned;
 }
 
 AXNodeData& AXNodeData::operator=(AXNodeData other) {
   id = other.id;
   role = other.role;
   state = other.state;
   actions = other.actions;
   string_attributes = other.string_attributes;
   int_attributes = other.int_attributes;
   float_attributes = other.float_attributes;
   bool_attributes = other.bool_attributes;
   intlist_attributes = other.intlist_attributes;
   stringlist_attributes = other.stringlist_attributes;
   html_attributes = other.html_attributes;
   child_ids = other.child_ids;
   location = other.location;
   offset_container_id = other.offset_container_id;
   if (other.transform)
     transform.reset(new gfx::Transform(*other.transform));
   else
     transform.reset(nullptr);
+  is_fixed_positioned = other.is_fixed_positioned;
   return *this;
 }
 
 bool AXNodeData::HasBoolAttribute(AXBoolAttribute attribute) const {
   auto iter = FindInVectorOfPairs(attribute, bool_attributes);
   return iter != bool_attributes.end();
 }
 
 bool AXNodeData::GetBoolAttribute(AXBoolAttribute attribute) const {
   bool result;
@@ skipping 294 matching lines @@
                    IntToString(location.y()) + ")-(" +
                    IntToString(location.width()) + ", " +
                    IntToString(location.height()) + ")";
 
   if (offset_container_id != -1)
     result += " offset_container_id=" + IntToString(offset_container_id);
 
   if (transform && !transform->IsIdentity())
     result += " transform=" + transform->ToString();
 
+  if (is_fixed_positioned)
+    result += " is_fixed_positioned";
+
   for (size_t i = 0; i < int_attributes.size(); ++i) {
     std::string value = IntToString(int_attributes[i].second);
     switch (int_attributes[i].first) {
       case AX_ATTR_DEFAULT_ACTION_VERB:
         result +=
             " action=" +
             base::UTF16ToUTF8(ActionVerbToUnlocalizedString(
                 static_cast<AXDefaultActionVerb>(int_attributes[i].second)));
         break;
       case AX_ATTR_SCROLL_X:
@@ skipping 453 matching lines @@
 
   result += " actions=" + ActionsBitfieldToString(actions);
 
   if (!child_ids.empty())
     result += " child_ids=" + IntVectorToString(child_ids);
 
   return result;
 }
 
 }  // namespace ui