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

/*
 * Copyright (C) 2012 Apple Inc. All rights reserved.
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#include "modules/accessibility/AXSVGRoot.h"

#include "modules/accessibility/AXObjectCacheImpl.h"

namespace blink {

AXSVGRoot::AXSVGRoot(LayoutObject* layout_object,
                     AXObjectCacheImpl& ax_object_cache)
    : AXLayoutObject(layout_object, ax_object_cache) {}

AXSVGRoot::~AXSVGRoot() = default;

AXSVGRoot* AXSVGRoot::Create(LayoutObject* layout_object,
                             AXObjectCacheImpl& ax_object_cache) {
  return new AXSVGRoot(layout_object, ax_object_cache);
}

void AXSVGRoot::SetParent(AXObject* parent) {
  // Only update the parent to another objcet if it wasn't already set to
  // something. Multiple elements in an HTML document can reference
  // the same remote SVG document, and in that case the parent should just
  // stay with the first one.
  if (!parent_ || !parent)
    parent_ = parent;
}

AXObject* AXSVGRoot::ComputeParent() const {
  DCHECK(!IsDetached());
  // If a parent was set because this is a remote SVG resource, use that
  // but otherwise, we should rely on the standard layout tree for the parent.
  if (parent_)
    return parent_;

  return AXLayoutObject::ComputeParent();
}

// SVG AAM 1.0 S8.2: the default role for an SVG root is "group".
AccessibilityRole AXSVGRoot::DetermineAccessibilityRole() {
  AccessibilityRole role = AXLayoutObject::DetermineAccessibilityRole();
  if (role == kUnknownRole)
    role = kGroupRole;
  return role;
}

// SVG elements are only ignored if they are a descendant of a leaf or when a
// generic element would also be ignored.
bool AXSVGRoot::ComputeAccessibilityIsIgnored(IgnoredReasons* reasons) const {
  if (IsDescendantOfLeafNode())
    return AXLayoutObject::ComputeAccessibilityIsIgnored(reasons);

  return AccessibilityIsIgnoredByDefault(reasons);
}

}  // namespace blink