Implement aria-modal

third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 1134 matching lines @@
 
   const AtomicString& expanded = getAttribute(aria_expandedAttr);
   if (equalIgnoringCase(expanded, "true"))
     return ExpandedExpanded;
   if (equalIgnoringCase(expanded, "false"))
     return ExpandedCollapsed;
 
   return ExpandedUndefined;
 }
 
+bool AXNodeObject::isModal() const {
+  if (roleValue() != DialogRole && roleValue() != AlertDialogRole)
+    return false;
+
+  if (hasAttribute(aria_modalAttr)) {
+    const AtomicString& modal = getAttribute(aria_modalAttr);
+    if (equalIgnoringCase(modal, "true"))
+      return true;
+    if (equalIgnoringCase(modal, "false"))
+      return false;
+  }
+
+  if (getNode() && isHTMLDialogElement(*getNode()))
+    return toElement(getNode())->isInTopLayer();
+
+  return false;
+}
+
 bool AXNodeObject::isPressed() const {
   if (!isButton())
     return false;
 
   Node* node = this->getNode();
   if (!node)
     return false;
 
   // ARIA button with aria-pressed not undefined, then check for aria-pressed
   // attribute rather than getNode()->active()
@@ skipping 1919 matching lines @@
     return String();
   return toTextControlElement(node)->strippedPlaceholder();
 }
 
 DEFINE_TRACE(AXNodeObject) {
   visitor->trace(m_node);
   AXObject::trace(visitor);
 }
 
 }  // namespace blink