svgimageelement.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
    Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <[e-mail]>
                  2004, 2005, 2006, 2007, 2008 Rob Buis <[e-mail]>
                  2006 Alexander Kellett <[e-mail]>

    This file is part of the KDE project

    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"

#if ENABLE(SVG)
#include "SVGImageElement.h"

#include "CSSPropertyNames.h"
#include "RenderSVGImage.h"
#include "SVGDocument.h"
#include "SVGLength.h"
#include "SVGPreserveAspectRatio.h"
#include "SVGSVGElement.h"
#include "XLinkNames.h"

namespace WebCore {

SVGImageElement::SVGImageElement(const QualifiedName& tagName, Document* doc)
    : SVGStyledTransformableElement(tagName, doc)
    , SVGTests()
    , SVGLangSpace()
    , SVGExternalResourcesRequired()
    , SVGURIReference()
    , m_x(this, SVGNames::xAttr, LengthModeWidth)
    , m_y(this, SVGNames::yAttr, LengthModeHeight)
    , m_width(this, SVGNames::widthAttr, LengthModeWidth)
    , m_height(this, SVGNames::heightAttr, LengthModeHeight)
    , m_preserveAspectRatio(this, SVGNames::preserveAspectRatioAttr, SVGPreserveAspectRatio::create())
    , m_imageLoader(this)
{
}

SVGImageElement::~SVGImageElement()
{
}

void SVGImageElement::parseMappedAttribute(MappedAttribute *attr)
{
    if (attr->name() == SVGNames::xAttr)
        setXBaseValue(SVGLength(LengthModeWidth, attr->value()));
    else if (attr->name() == SVGNames::yAttr)
        setYBaseValue(SVGLength(LengthModeHeight, attr->value()));
    else if (attr->name() == SVGNames::preserveAspectRatioAttr) {
        const UChar* c = attr->value().characters();
        const UChar* end = c + attr->value().length();
        preserveAspectRatioBaseValue()->parsePreserveAspectRatio(c, end);
    } else if (attr->name() == SVGNames::widthAttr) {
        setWidthBaseValue(SVGLength(LengthModeWidth, attr->value()));
        addCSSProperty(attr, CSSPropertyWidth, attr->value());
        if (widthBaseValue().value(this) < 0.0)
            document()->accessSVGExtensions()->reportError("A negative value for image attribute <width> is not allowed");
    } else if (attr->name() == SVGNames::heightAttr) {
        setHeightBaseValue(SVGLength(LengthModeHeight, attr->value()));
        addCSSProperty(attr, CSSPropertyHeight, attr->value());
        if (heightBaseValue().value(this) < 0.0)
            document()->accessSVGExtensions()->reportError("A negative value for image attribute <height> is not allowed");
    } else {
        if (SVGTests::parseMappedAttribute(attr))
            return;
        if (SVGLangSpace::parseMappedAttribute(attr))
            return;
        if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
            return;
        if (SVGURIReference::parseMappedAttribute(attr))
            return;
        SVGStyledTransformableElement::parseMappedAttribute(attr);
    }
}

void SVGImageElement::svgAttributeChanged(const QualifiedName& attrName)
{
    SVGStyledTransformableElement::svgAttributeChanged(attrName);

    if (!renderer())
        return;

    bool isURIAttribute = SVGURIReference::isKnownAttribute(attrName);

    if (attrName == SVGNames::xAttr || attrName == SVGNames::yAttr ||
        attrName == SVGNames::widthAttr || attrName == SVGNames::heightAttr ||
        attrName == SVGNames::preserveAspectRatioAttr ||
        SVGTests::isKnownAttribute(attrName) ||
        SVGLangSpace::isKnownAttribute(attrName) ||
        SVGExternalResourcesRequired::isKnownAttribute(attrName) ||
        isURIAttribute ||
        SVGStyledTransformableElement::isKnownAttribute(attrName)) {
        renderer()->setNeedsLayout(true);

        if (isURIAttribute)
            m_imageLoader.updateFromElementIgnoringPreviousError();
    }
}

bool SVGImageElement::hasRelativeValues() const
{
    return (x().isRelative() || width().isRelative() ||
            y().isRelative() || height().isRelative());
}

RenderObject* SVGImageElement::createRenderer(RenderArena* arena, RenderStyle*)
{
    return new (arena) RenderSVGImage(this);
}

bool SVGImageElement::haveLoadedRequiredResources()
{
    return !externalResourcesRequiredBaseValue() || m_imageLoader.haveFiredLoadEvent();
}

void SVGImageElement::attach()
{
    SVGStyledTransformableElement::attach();

    if (RenderSVGImage* imageObj = static_cast<RenderSVGImage*>(renderer())) {
        if (imageObj->hasImage())
            return;

        imageObj->setCachedImage(m_imageLoader.image());
    }
}

void SVGImageElement::insertedIntoDocument()
{
    SVGStyledTransformableElement::insertedIntoDocument();

    // Update image loader, as soon as we're living in the tree.
    // We can only resolve base URIs properly, after that!
    m_imageLoader.updateFromElement();
}

const QualifiedName& SVGImageElement::imageSourceAttributeName() const
{
    return XLinkNames::hrefAttr;
}

void SVGImageElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const
{
    SVGStyledTransformableElement::addSubresourceAttributeURLs(urls);

    addSubresourceURL(urls, document()->completeURL(href()));
}

}

#endif // ENABLE(SVG)