svgsvgelement.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 Nikolas Zimmermann <[e-mail]>
                  2004, 2005, 2006, 2007, 2008 Rob Buis <[e-mail]>
                  2007 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"

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

#include "TransformationMatrix.h"
#include "CSSHelper.h"
#include "CSSPropertyNames.h"
#include "Document.h"
#include "EventListener.h"
#include "EventNames.h"
#include "FloatConversion.h"
#include "FloatRect.h"
#include "Frame.h"
#include "HTMLNames.h"
#include "RenderSVGViewportContainer.h"
#include "RenderSVGRoot.h"
#include "SVGAngle.h"
#include "SVGLength.h"
#include "SVGNames.h"
#include "SVGPreserveAspectRatio.h"
#include "SVGTransform.h"
#include "SVGTransformList.h"
#include "SVGViewElement.h"
#include "SVGViewSpec.h"
#include "SVGZoomEvent.h"
#include "SelectionController.h"
#include "SMILTimeContainer.h"
#include <wtf/StdLibExtras.h>

namespace WebCore {

using namespace HTMLNames;
using namespace SVGNames;

SVGSVGElement::SVGSVGElement(const QualifiedName& tagName, Document* doc)
    : SVGStyledLocatableElement(tagName, doc)
    , SVGTests()
    , SVGLangSpace()
    , SVGExternalResourcesRequired()
    , SVGFitToViewBox()
    , SVGZoomAndPan()
    , m_x(this, SVGNames::xAttr, LengthModeWidth)
    , m_y(this, SVGNames::yAttr, LengthModeHeight)
    , m_width(this, SVGNames::widthAttr, LengthModeWidth, "100%")
    , m_height(this, SVGNames::heightAttr, LengthModeHeight, "100%")
    , m_useCurrentView(false)
    , m_timeContainer(SMILTimeContainer::create(this))
    , m_viewSpec(0)
    , m_containerSize(300, 150)
    , m_hasSetContainerSize(false)
{
    doc->registerForDocumentActivationCallbacks(this);
}

SVGSVGElement::~SVGSVGElement()
{
    document()->unregisterForDocumentActivationCallbacks(this);
    // There are cases where removedFromDocument() is not called.
    // see ContainerNode::removeAllChildren, called by its destructor.
    document()->accessSVGExtensions()->removeTimeContainer(this);

    // Call detach() here because if we wait until ~Node() calls it, we crash during
    // RenderSVGViewportContainer destruction, as the renderer assumes that the element
    // is still fully constructed. See <https://bugs.webkit.org/show_bug.cgi?id=21293>.
    if (renderer())
        detach();
}

const AtomicString& SVGSVGElement::contentScriptType() const
{
    DEFINE_STATIC_LOCAL(const AtomicString, defaultValue, ("text/ecmascript"));
    const AtomicString& n = getAttribute(contentScriptTypeAttr);
    return n.isNull() ? defaultValue : n;
}

void SVGSVGElement::setContentScriptType(const AtomicString& type)
{
    setAttribute(SVGNames::contentScriptTypeAttr, type);
}

const AtomicString& SVGSVGElement::contentStyleType() const
{
    DEFINE_STATIC_LOCAL(const AtomicString, defaultValue, ("text/css"));
    const AtomicString& n = getAttribute(contentStyleTypeAttr);
    return n.isNull() ? defaultValue : n;
}

void SVGSVGElement::setContentStyleType(const AtomicString& type)
{
    setAttribute(SVGNames::contentStyleTypeAttr, type);
}

FloatRect SVGSVGElement::viewport() const
{
    double _x = 0.0;
    double _y = 0.0;
    if (!isOutermostSVG()) {
        _x = x().value(this);
        _y = y().value(this);
    }
    float w = width().value(this);
    float h = height().value(this);
    TransformationMatrix viewBox = viewBoxToViewTransform(w, h);
    double wDouble = w;
    double hDouble = h;
    viewBox.map(_x, _y, _x, _y);
    viewBox.map(w, h, wDouble, hDouble);
    return FloatRect::narrowPrecision(_x, _y, wDouble, hDouble);
}

int SVGSVGElement::relativeWidthValue() const
{
    SVGLength w = width();
    if (w.unitType() != LengthTypePercentage)
        return 0;

    return static_cast<int>(w.valueAsPercentage() * m_containerSize.width());
}

int SVGSVGElement::relativeHeightValue() const
{
    SVGLength h = height();
    if (h.unitType() != LengthTypePercentage)
        return 0;

    return static_cast<int>(h.valueAsPercentage() * m_containerSize.height());
}

float SVGSVGElement::pixelUnitToMillimeterX() const
{
    // 2.54 / cssPixelsPerInch gives CM.
    return (2.54f / cssPixelsPerInch) * 10.0f;
}

float SVGSVGElement::pixelUnitToMillimeterY() const
{
    // 2.54 / cssPixelsPerInch gives CM.
    return (2.54f / cssPixelsPerInch) * 10.0f;
}

float SVGSVGElement::screenPixelToMillimeterX() const
{
    return pixelUnitToMillimeterX();
}

float SVGSVGElement::screenPixelToMillimeterY() const
{
    return pixelUnitToMillimeterY();
}

bool SVGSVGElement::useCurrentView() const
{
    return m_useCurrentView;
}

void SVGSVGElement::setUseCurrentView(bool currentView)
{
    m_useCurrentView = currentView;
}

SVGViewSpec* SVGSVGElement::currentView() const
{
    if (!m_viewSpec)
        m_viewSpec.set(new SVGViewSpec(this));

    return m_viewSpec.get();
}

float SVGSVGElement::currentScale() const
{
    if (document() && document()->frame())
        return document()->frame()->zoomFactor();
    return 1.0f;
}

void SVGSVGElement::setCurrentScale(float scale)
{
    if (document() && document()->frame())
        document()->frame()->setZoomFactor(scale, true);
}

FloatPoint SVGSVGElement::currentTranslate() const
{
    return m_translation;
}

void SVGSVGElement::setCurrentTranslate(const FloatPoint &translation)
{
    m_translation = translation;
    if (parentNode() == document() && document()->renderer())
        document()->renderer()->repaint();
}

void SVGSVGElement::parseMappedAttribute(MappedAttribute* attr)
{
    if (!nearestViewportElement()) {
        bool setListener = true;

        // Only handle events if we're the outermost <svg> element
        if (attr->name() == onunloadAttr)
            document()->setWindowInlineEventListenerForTypeAndAttribute(eventNames().unloadEvent, attr);
        else if (attr->name() == onresizeAttr)
            document()->setWindowInlineEventListenerForTypeAndAttribute(eventNames().resizeEvent, attr);
        else if (attr->name() == onscrollAttr)
            document()->setWindowInlineEventListenerForTypeAndAttribute(eventNames().scrollEvent, attr);
        else if (attr->name() == SVGNames::onzoomAttr)
            document()->setWindowInlineEventListenerForTypeAndAttribute(eventNames().zoomEvent, attr);
        else
            setListener = false;
 
        if (setListener)
            return;
    }

    if (attr->name() == onabortAttr)
        document()->setWindowInlineEventListenerForTypeAndAttribute(eventNames().abortEvent, attr);
    else if (attr->name() == onerrorAttr)
        document()->setWindowInlineEventListenerForTypeAndAttribute(eventNames().errorEvent, attr);
    else 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::widthAttr) {
        setWidthBaseValue(SVGLength(LengthModeWidth, attr->value()));
        addCSSProperty(attr, CSSPropertyWidth, attr->value());
        if (widthBaseValue().value(this) < 0.0)
            document()->accessSVGExtensions()->reportError("A negative value for svg 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 svg attribute <height> is not allowed");
    } else {
        if (SVGTests::parseMappedAttribute(attr))
            return;
        if (SVGLangSpace::parseMappedAttribute(attr))
            return;
        if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
            return;
        if (SVGFitToViewBox::parseMappedAttribute(attr))
            return;
        if (SVGZoomAndPan::parseMappedAttribute(attr))
            return;

        SVGStyledLocatableElement::parseMappedAttribute(attr);
    }
}