third_party/blink/renderer/modules/accessibility/ax_image_map_link.cc

/*
 * Copyright (C) 2008 Apple 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
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "third_party/blink/renderer/modules/accessibility/ax_image_map_link.h"

#include "third_party/blink/renderer/core/aom/accessible_node.h"
#include "third_party/blink/renderer/core/dom/element_traversal.h"
#include "third_party/blink/renderer/core/html/html_image_element.h"
#include "third_party/blink/renderer/modules/accessibility/ax_layout_object.h"
#include "third_party/blink/renderer/modules/accessibility/ax_object_cache_impl.h"
#include "third_party/blink/renderer/platform/graphics/path.h"
#include "ui/gfx/geometry/transform.h"

namespace blink {

AXImageMapLink::AXImageMapLink(HTMLAreaElement* area,
                               AXObjectCacheImpl& ax_object_cache)
    : AXNodeObject(area, ax_object_cache) {}

AXImageMapLink::~AXImageMapLink() = default;

HTMLMapElement* AXImageMapLink::MapElement() const {
  HTMLAreaElement* area = AreaElement();
  if (!area)
    return nullptr;
  return Traversal<HTMLMapElement>::FirstAncestor(*area);
}

// static
AXObject* AXImageMapLink::GetAXObjectForImageMap(AXObjectCacheImpl& cache,
                                                 Node* area) {
  DCHECK(area);
  DCHECK(IsA<HTMLAreaElement>(area));

  HTMLMapElement* map = Traversal<HTMLMapElement>::FirstAncestor(*area);
  if (!map)
    return nullptr;

  return cache.Get(static_cast<Node*>(map->ImageElement()));
}

ax::mojom::blink::Role AXImageMapLink::NativeRoleIgnoringAria() const {
  // https://www.w3.org/TR/html-aam-1.0/#html-element-role-mappings
  // <area> tags without an href should be treated as static text.
  // If the area has child nodes, those will be rendered naturally, and the
  // role needs to be a generic container role that allows children.
  KURL url = Url();
  bool has_url = !url.IsNull() && !url.IsEmpty();
  if (has_url)
    return ax::mojom::blink::Role::kLink;

  if (!GetElement()->hasChildren())
    return ax::mojom::blink::Role::kStaticText;

  return ax::mojom::blink::Role::kGenericContainer;
}

Element* AXImageMapLink::ActionElement() const {
  return AnchorElement();
}

Element* AXImageMapLink::AnchorElement() const {
  return To<Element>(GetNode());
}

KURL AXImageMapLink::Url() const {
  if (!AreaElement())
    return KURL();

  return AreaElement()->Href();
}

void AXImageMapLink::GetRelativeBounds(AXObject** out_container,
                                       gfx::RectF& out_bounds_in_container,
                                       gfx::Transform& out_container_transform,
                                       bool* clips_children) const {
  *out_container = nullptr;
  out_bounds_in_container = gfx::RectF();
  out_container_transform.MakeIdentity();

  HTMLAreaElement* area = AreaElement();
  HTMLMapElement* map = MapElement();
  if (!area || !map)
    return;

  LayoutObject* layout_object;
  if (auto* ax_object = DynamicTo<AXLayoutObject>(parent_.Get()))
    layout_object = ax_object->GetLayoutObject();
  else
    layout_object = map->GetLayoutObject();

  if (!layout_object)
    return;

  out_bounds_in_container = area->GetPath(layout_object).BoundingRect();
  *out_container = AXObjectCache().Get(layout_object);
}

bool AXImageMapLink::IsImageMapLink() const {
  return true;
}

void AXImageMapLink::Trace(Visitor* visitor) const {
  AXNodeObject::Trace(visitor);
}

}  // namespace blink