Source/core/svg/SVGForeignObjectElement.cpp

/*
 * Copyright (C) 2006 Apple Inc. All rights reserved.
 * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@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/SVGForeignObjectElement.h"

#include "core/XLinkNames.h"
#include "core/frame/UseCounter.h"
#include "core/layout/svg/LayoutSVGForeignObject.h"
#include "core/svg/SVGLength.h"
#include "wtf/Assertions.h"

namespace blink {

inline SVGForeignObjectElement::SVGForeignObjectElement(Document& document)
    : SVGGraphicsElement(SVGNames::foreignObjectTag, document)
    , m_x(SVGAnimatedLength::create(this, SVGNames::xAttr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths))
    , m_y(SVGAnimatedLength::create(this, SVGNames::yAttr, SVGLength::create(SVGLengthMode::Height), AllowNegativeLengths))
    , m_width(SVGAnimatedLength::create(this, SVGNames::widthAttr, SVGLength::create(SVGLengthMode::Width), ForbidNegativeLengths))
    , m_height(SVGAnimatedLength::create(this, SVGNames::heightAttr, SVGLength::create(SVGLengthMode::Height), ForbidNegativeLengths))
{
    addToPropertyMap(m_x);
    addToPropertyMap(m_y);
    addToPropertyMap(m_width);
    addToPropertyMap(m_height);

    UseCounter::count(document, UseCounter::SVGForeignObjectElement);
}

DEFINE_TRACE(SVGForeignObjectElement)
{
    visitor->trace(m_x);
    visitor->trace(m_y);
    visitor->trace(m_width);
    visitor->trace(m_height);
    SVGGraphicsElement::trace(visitor);
}

DEFINE_NODE_FACTORY(SVGForeignObjectElement)

bool SVGForeignObjectElement::isPresentationAttribute(const QualifiedName& name) const
{
    if (name == SVGNames::xAttr || name == SVGNames::yAttr
        || name == SVGNames::widthAttr || name == SVGNames::heightAttr)
        return true;
    return SVGGraphicsElement::isPresentationAttribute(name);
}

bool SVGForeignObjectElement::isPresentationAttributeWithSVGDOM(const QualifiedName& attrName) const
{
    if (attrName == SVGNames::xAttr || attrName== SVGNames::yAttr
        || attrName == SVGNames::widthAttr || attrName == SVGNames::heightAttr)
        return true;
    return SVGGraphicsElement::isPresentationAttributeWithSVGDOM(attrName);
}

void SVGForeignObjectElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStylePropertySet* style)
{
    RefPtrWillBeRawPtr<SVGAnimatedPropertyBase> property = propertyFromAttribute(name);
    if (property == m_width)
        addSVGLengthPropertyToPresentationAttributeStyle(style, CSSPropertyWidth, *m_width->currentValue());
    else if (property == m_height)
        addSVGLengthPropertyToPresentationAttributeStyle(style, CSSPropertyHeight, *m_height->currentValue());
    else if (property == m_x)
        addSVGLengthPropertyToPresentationAttributeStyle(style, CSSPropertyX, *m_x->currentValue());
    else if (property == m_y)
        addSVGLengthPropertyToPresentationAttributeStyle(style, CSSPropertyY, *m_y->currentValue());
    else
        SVGGraphicsElement::collectStyleForPresentationAttribute(name, value, style);
}

void SVGForeignObjectElement::svgAttributeChanged(const QualifiedName& attrName)
{
    bool isWidthHeightAttribute = attrName == SVGNames::widthAttr
        || attrName == SVGNames::heightAttr;
    bool isXYAttribute = attrName == SVGNames::xAttr || attrName == SVGNames::yAttr;

    if (isXYAttribute || isWidthHeightAttribute) {
        SVGElement::InvalidationGuard invalidationGuard(this);

        invalidateSVGPresentationAttributeStyle();
        setNeedsStyleRecalc(LocalStyleChange,
            isWidthHeightAttribute ? StyleChangeReasonForTracing::create(StyleChangeReason::SVGContainerSizeChange) : StyleChangeReasonForTracing::fromAttribute(attrName));

        updateRelativeLengthsInformation();
        if (LayoutObject* layoutObject = this->layoutObject())
            markForLayoutAndParentResourceInvalidation(layoutObject);

        return;
    }

    SVGGraphicsElement::svgAttributeChanged(attrName);
}

LayoutObject* SVGForeignObjectElement::createLayoutObject(const ComputedStyle&)
{
    return new LayoutSVGForeignObject(this);
}

bool SVGForeignObjectElement::layoutObjectIsNeeded(const ComputedStyle& style)
{
    // Suppress foreignObject layoutObjects in SVG hidden containers.
    // (https://bugs.webkit.org/show_bug.cgi?id=87297)
    // Note that we currently do not support foreignObject instantiation via <use>, hence it is safe
    // to use parentElement() here. If that changes, this method should be updated to use
    // parentOrShadowHostElement() instead.
    Element* ancestor = parentElement();
    while (ancestor && ancestor->isSVGElement()) {
        if (ancestor->layoutObject() && ancestor->layoutObject()->isSVGHiddenContainer())
            return false;

        ancestor = ancestor->parentElement();
    }

    return SVGGraphicsElement::layoutObjectIsNeeded(style);
}

bool SVGForeignObjectElement::selfHasRelativeLengths() const
{
    return m_x->currentValue()->isRelative()
        || m_y->currentValue()->isRelative()
        || m_width->currentValue()->isRelative()
        || m_height->currentValue()->isRelative();
}

} // namespace blink