Source/WebCore/html/HTMLMapElement.cpp

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "HTMLMapElement.h"

#include "Attribute.h"
#include "Document.h"
#include "ElementInlines.h"
#include "GenericCachedHTMLCollection.h"
#include "HTMLAreaElement.h"
#include "HTMLImageElement.h"
#include "HitTestResult.h"
#include "IntSize.h"
#include "NodeRareData.h"
#include "TypedElementDescendantIteratorInlines.h"
#include <wtf/TZoneMallocInlines.h>

namespace WebCore {

WTF_MAKE_TZONE_ALLOCATED_IMPL(HTMLMapElement);

using namespace HTMLNames;

HTMLMapElement::HTMLMapElement(const QualifiedName& tagName, Document& document)
    : HTMLElement(tagName, document)
{
    ASSERT(hasTagName(mapTag));
}

Ref<HTMLMapElement> HTMLMapElement::create(Document& document)
{
    return adoptRef(*new HTMLMapElement(mapTag, document));
}

Ref<HTMLMapElement> HTMLMapElement::create(const QualifiedName& tagName, Document& document)
{
    return adoptRef(*new HTMLMapElement(tagName, document));
}

HTMLMapElement::~HTMLMapElement() = default;

bool HTMLMapElement::mapMouseEvent(LayoutPoint location, const LayoutSize& size, HitTestResult& result)
{
    RefPtr<HTMLAreaElement> defaultArea;

    for (Ref area : descendantsOfType<HTMLAreaElement>(*this)) {
        if (area->isDefault()) {
            if (!defaultArea)
                defaultArea = area.ptr();
        } else if (area->mapMouseEvent(location, size, result))
            return true;
    }
    
    if (defaultArea) {
        result.setInnerNode(defaultArea.get());
        result.setURLElement(defaultArea.get());
    }
    return defaultArea;
}

RefPtr<HTMLImageElement> HTMLMapElement::imageElement()
{
    if (m_name.isEmpty())
        return nullptr;
    return protect(treeScope())->imageElementByUsemap(m_name);
}

void HTMLMapElement::attributeChanged(const QualifiedName& name, const AtomString& oldValue, const AtomString& newValue, AttributeModificationReason attributeModificationReason)
{
    HTMLElement::attributeChanged(name, oldValue, newValue, attributeModificationReason);

    if (name == HTMLNames::idAttr || name == HTMLNames::nameAttr) {
        auto oldMapName = m_name;

        if (name == HTMLNames::nameAttr) {
            AtomString mapName = newValue;
            if (mapName[0] == '#')
                mapName = StringView(mapName).substring(1).toAtomString();
            m_name = WTF::move(mapName);
        }

        auto newId = getIdAttribute();
        if (oldMapName == m_name && m_registeredId == newId)
            return;

        if (isInTreeScope()) {
            protect(treeScope())->removeImageMap(*this, oldMapName, m_registeredId);
            m_registeredId = newId;
            protect(treeScope())->addImageMap(*this, m_name, m_registeredId);
        } else
            m_registeredId = newId;
    }
}

Ref<HTMLCollection> HTMLMapElement::areas()
{
    return ensureRareData().ensureNodeLists().addCachedCollection<HTMLMapAreasCollection>(*this);
}

Node::NeedsPostConnectionSteps HTMLMapElement::insertionSteps(InsertionType insertionType, ContainerNode& parentOfInsertedTree)
{
    Node::NeedsPostConnectionSteps request = HTMLElement::insertionSteps(insertionType, parentOfInsertedTree);
    if (insertionType.treeScopeChanged) {
        m_registeredId = getIdAttribute();
        protect(treeScope())->addImageMap(*this, m_name, m_registeredId);
    }
    return request;
}

void HTMLMapElement::removingSteps(RemovalType removalType, ContainerNode& oldParentOfRemovedTree)
{
    if (removalType.treeScopeChanged)
        protect(oldParentOfRemovedTree.treeScope())->removeImageMap(*this, m_name, m_registeredId);
    HTMLElement::removingSteps(removalType, oldParentOfRemovedTree);
}

}