/*
 * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
 *
 * 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/SVGGElement.h"

#include "SVGNames.h"
#include "core/rendering/svg/RenderSVGHiddenContainer.h"
#include "core/rendering/svg/RenderSVGResource.h"
#include "core/rendering/svg/RenderSVGTransformableContainer.h"
#include "core/svg/SVGElementInstance.h"

namespace WebCore {

// Animated property definitions
DEFINE_ANIMATED_BOOLEAN(SVGGElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)

BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGGElement)
    REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
    REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGraphicsElement)
END_REGISTER_ANIMATED_PROPERTIES

SVGGElement::SVGGElement(const QualifiedName& tagName, Document* document, ConstructionType constructionType)
    : SVGGraphicsElement(tagName, document, constructionType)
{
    ASSERT(hasTagName(SVGNames::gTag));
    ScriptWrappable::init(this);
    registerAnimatedPropertiesForSVGGElement();
}

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

bool SVGGElement::isSupportedAttribute(const QualifiedName& attrName)
{
    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
    if (supportedAttributes.isEmpty())
        SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
}

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

    if (SVGLangSpace::parseAttribute(name, value))
        return;

    ASSERT_NOT_REACHED();
}

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

    SVGElementInstance::InvalidationGuard invalidationGuard(this);

    if (RenderObject* renderer = this->renderer())
        RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
}

RenderObject* SVGGElement::createRenderer(RenderStyle* style)
{
    // SVG 1.1 testsuite explicitely uses constructs like <g display="none"><linearGradient>
    // We still have to create renderers for the <g> & <linearGradient> element, though the
    // subtree may be hidden - we only want the resource renderers to exist so they can be
    // referenced from somewhere else.
    if (style->display() == NONE)
        return new (document()->renderArena()) RenderSVGHiddenContainer(this);

    return new (document()->renderArena()) RenderSVGTransformableContainer(this);
}

bool SVGGElement::rendererIsNeeded(const NodeRenderingContext&)
{
    // Unlike SVGStyledElement::rendererIsNeeded(), we still create renderers, even if
    // display is set to 'none' - which is special to SVG <g> container elements.
    return parentOrShadowHostElement() && parentOrShadowHostElement()->isSVGElement();
}

}