Source/core/svg/SVGAElement.cpp

/*
 * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
 * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
 * Copyright (C) 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 "core/svg/SVGAElement.h"

#include "SVGNames.h"
#include "XLinkNames.h"
#include "core/dom/Attr.h"
#include "core/dom/Attribute.h"
#include "core/dom/Document.h"
#include "core/events/KeyboardEvent.h"
#include "core/events/MouseEvent.h"
#include "core/events/ThreadLocalEventNames.h"
#include "core/frame/Frame.h"
#include "core/html/HTMLAnchorElement.h"
#include "core/html/HTMLFormElement.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "core/loader/FrameLoadRequest.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/FrameLoaderTypes.h"
#include "core/page/Chrome.h"
#include "core/page/ChromeClient.h"
#include "core/page/Page.h"
#include "core/rendering/svg/RenderSVGInline.h"
#include "core/rendering/svg/RenderSVGText.h"
#include "core/rendering/svg/RenderSVGTransformableContainer.h"
#include "core/svg/SVGElementInstance.h"
#include "core/svg/animation/SVGSMILElement.h"
#include "platform/PlatformMouseEvent.h"
#include "platform/network/ResourceRequest.h"

namespace WebCore {

using namespace HTMLNames;

// Animated property definitions

BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGAElement)
    REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGraphicsElement)
END_REGISTER_ANIMATED_PROPERTIES

inline SVGAElement::SVGAElement(Document& document)
    : SVGGraphicsElement(SVGNames::aTag, document)
    , SVGURIReference(this)
    , m_svgTarget(SVGAnimatedString::create(this, SVGNames::targetAttr, SVGString::create()))
{
    ScriptWrappable::init(this);
    addToPropertyMap(m_svgTarget);
    registerAnimatedPropertiesForSVGAElement();
}

PassRefPtr<SVGAElement> SVGAElement::create(Document& document)
{
    return adoptRef(new SVGAElement(document));
}

String SVGAElement::title() const
{
    // If the xlink:title is set (non-empty string), use it.
    const AtomicString& title = fastGetAttribute(XLinkNames::titleAttr);
    if (!title.isEmpty())
        return title;

    // Otherwise, use the title of this element.
    return SVGElement::title();
}

bool SVGAElement::isSupportedAttribute(const QualifiedName& attrName)
{
    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
    if (supportedAttributes.isEmpty()) {
        SVGURIReference::addSupportedAttributes(supportedAttributes);
        supportedAttributes.add(SVGNames::targetAttr);
    }
    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
}

void SVGAElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
    if (!isSupportedAttribute(name)) {
        SVGGraphicsElement::parseAttribute(name, value);
        return;
    }

    SVGParsingError parseError = NoError;

    if (name == SVGNames::targetAttr) {
        m_svgTarget->setBaseValueAsString(value, parseError);
    } else if (SVGURIReference::parseAttribute(name, value, parseError)) {
    } else {
        ASSERT_NOT_REACHED();
    }

    reportAttributeParsingError(parseError, name, value);
}

void SVGAElement::svgAttributeChanged(const QualifiedName& attrName)
{
    if (!isSupportedAttribute(attrName)) {
        SVGGraphicsElement::svgAttributeChanged(attrName);
        return;
    }

    SVGElementInstance::InvalidationGuard invalidationGuard(this);

    // Unlike other SVG*Element classes, SVGAElement only listens to SVGURIReference changes
    // as none of the other properties changes the linking behaviour for our <a> element.
    if (SVGURIReference::isKnownAttribute(attrName)) {
        bool wasLink = isLink();
        setIsLink(!hrefString().isNull());

        if (wasLink != isLink())
            setNeedsStyleRecalc(SubtreeStyleChange);
    }
}

RenderObject* SVGAElement::createRenderer(RenderStyle*)
{
    if (parentNode() && parentNode()->isSVGElement() && toSVGElement(parentNode())->isTextContent())
        return new RenderSVGInline(this);

    return new RenderSVGTransformableContainer(this);
}

void SVGAElement::defaultEventHandler(Event* event)
{
    if (isLink()) {
        if (focused() && isEnterKeyKeydownEvent(event)) {
            event->setDefaultHandled();
            dispatchSimulatedClick(event);
            return;
        }

        if (isLinkClick(event)) {
            String url = stripLeadingAndTrailingHTMLSpaces(hrefString());

            if (url[0] == '#') {
                Element* targetElement = treeScope().getElementById(AtomicString(url.substring(1)));
                if (targetElement && isSVGSMILElement(*targetElement)) {
                    toSVGSMILElement(targetElement)->beginByLinkActivation();
                    event->setDefaultHandled();
                    return;
                }
                // Only allow navigation to internal <view> anchors.
                if (targetElement && !targetElement->hasTagName(SVGNames::viewTag))
                    return;
            }

            AtomicString target(m_svgTarget->currentValue()->value());
            if (target.isEmpty() && fastGetAttribute(XLinkNames::showAttr) == "new")
                target = AtomicString("_blank", AtomicString::ConstructFromLiteral);
            event->setDefaultHandled();

            Frame* frame = document().frame();
            if (!frame)
                return;
            FrameLoadRequest frameRequest(&document(), ResourceRequest(document().completeURL(url)), target);
            frameRequest.setTriggeringEvent(event);
            frame->loader().load(frameRequest);
            return;
        }
    }

    SVGGraphicsElement::defaultEventHandler(event);
}

bool SVGAElement::supportsFocus() const
{
    if (rendererIsEditable())
        return SVGGraphicsElement::supportsFocus();
    return true;
}

bool SVGAElement::isURLAttribute(const Attribute& attribute) const
{
    return attribute.name().localName() == hrefAttr || SVGGraphicsElement::isURLAttribute(attribute);
}

bool SVGAElement::isMouseFocusable() const
{
    return false;
}

bool SVGAElement::isKeyboardFocusable() const
{
    if (!isFocusable())
        return false;

    if (Page* page = document().page())
        return page->chrome().client().tabsToLinks();
    return false;
}

bool SVGAElement::willRespondToMouseClickEvents()
{
    return isLink() || SVGGraphicsElement::willRespondToMouseClickEvents();
}

} // namespace WebCore