WebCore/svg/SVGStyledElement.cpp

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

    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 "SVGStyledElement.h"

#include "Attr.h"
#include "CSSStyleSelector.h"
#include "CString.h"
#include "Document.h"
#include "HTMLNames.h"
#include "PlatformString.h"
#include "SVGElement.h"
#include "SVGElementInstance.h"
#include "SVGNames.h"
#include "RenderObject.h"
#include "SVGRenderStyle.h"
#include "SVGResource.h"
#include "SVGSVGElement.h"
#include <wtf/Assertions.h>

namespace WebCore {

using namespace SVGNames;

SVGStyledElement::SVGStyledElement(const QualifiedName& tagName, Document* doc)
    : SVGElement(tagName, doc)
{
}

SVGStyledElement::~SVGStyledElement()
{
    SVGResource::removeClient(this);
}

ANIMATED_PROPERTY_DEFINITIONS(SVGStyledElement, String, String, string, ClassName, className, HTMLNames::classAttr, m_className)

bool SVGStyledElement::rendererIsNeeded(RenderStyle* style)
{
    // http://www.w3.org/TR/SVG/extend.html#PrivateData
    // Prevent anything other than SVG renderers from appearing in our render tree
    // Spec: SVG allows inclusion of elements from foreign namespaces anywhere
    // with the SVG content. In general, the SVG user agent will include the unknown
    // elements in the DOM but will otherwise ignore unknown elements. 
    if (!parentNode() || parentNode()->isSVGElement())
        return StyledElement::rendererIsNeeded(style);

    return false;
}

static inline void mapAttributeToCSSProperty(HashMap<AtomicStringImpl*, int>* propertyNameToIdMap, const QualifiedName& attrName, const char* cssPropertyName = 0)
{
    int propertyId = 0;
    if (cssPropertyName)
        propertyId = getPropertyID(cssPropertyName, strlen(cssPropertyName));
    else {
        CString propertyName = attrName.localName().domString().utf8();
        propertyId = getPropertyID(propertyName.data(), propertyName.length());
    }
    ASSERT(propertyId > 0);
    propertyNameToIdMap->set(attrName.localName().impl(), propertyId);
}

int SVGStyledElement::cssPropertyIdForSVGAttributeName(const QualifiedName& attrName)
{
    if (!attrName.namespaceURI().isNull())
        return 0;
    
    static HashMap<AtomicStringImpl*, int>* propertyNameToIdMap = 0;
    if (!propertyNameToIdMap) {
        propertyNameToIdMap = new HashMap<AtomicStringImpl*, int>;
        // This is a list of all base CSS and SVG CSS properties which are exposed as SVG XML attributes
        mapAttributeToCSSProperty(propertyNameToIdMap, alignment_baselineAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, baseline_shiftAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, clipAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, clip_pathAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, clip_ruleAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, colorAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, color_interpolationAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, color_interpolation_filtersAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, color_profileAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, color_renderingAttr); 
        mapAttributeToCSSProperty(propertyNameToIdMap, cursorAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, directionAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, displayAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, dominant_baselineAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, enable_backgroundAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, fillAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, fill_opacityAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, fill_ruleAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, filterAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, flood_colorAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, flood_opacityAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, font_familyAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, font_sizeAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, font_stretchAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, font_styleAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, font_variantAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, font_weightAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, glyph_orientation_horizontalAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, glyph_orientation_verticalAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, image_renderingAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, kerningAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, letter_spacingAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, lighting_colorAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, marker_endAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, marker_midAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, marker_startAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, maskAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, opacityAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, overflowAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, pointer_eventsAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, shape_renderingAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, stop_colorAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, stop_opacityAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, strokeAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, stroke_dasharrayAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, stroke_dashoffsetAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, stroke_linecapAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, stroke_linejoinAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, stroke_miterlimitAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, stroke_opacityAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, stroke_widthAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, text_anchorAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, text_decorationAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, text_renderingAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, unicode_bidiAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, visibilityAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, word_spacingAttr);
        mapAttributeToCSSProperty(propertyNameToIdMap, writing_modeAttr);
    }
    
    return propertyNameToIdMap->get(attrName.localName().impl());
}

bool SVGStyledElement::mapToEntry(const QualifiedName& attrName, MappedAttributeEntry& result) const
{
    if (SVGStyledElement::cssPropertyIdForSVGAttributeName(attrName) > 0) {
        result = eSVG;
        return false;
    }
    return SVGElement::mapToEntry(attrName, result);
}

void SVGStyledElement::parseMappedAttribute(MappedAttribute* attr)
{
    // NOTE: Any subclass which overrides parseMappedAttribute for a property handled by
    // cssPropertyIdForSVGAttributeName will also have to override mapToEntry to disable the default eSVG mapping
    int propId = SVGStyledElement::cssPropertyIdForSVGAttributeName(attr->name());
    if (propId > 0) {
        addCSSProperty(attr, propId, attr->value());
        setChanged();
        return;
    }
    
    // id and class are handled by StyledElement
    SVGElement::parseMappedAttribute(attr);
}

bool SVGStyledElement::isKnownAttribute(const QualifiedName& attrName)
{
    // Recognize all style related SVG CSS properties
    int propId = SVGStyledElement::cssPropertyIdForSVGAttributeName(attrName);
    if (propId > 0)
        return true;

    return (attrName == HTMLNames::idAttr || attrName == HTMLNames::styleAttr); 
}

void SVGStyledElement::svgAttributeChanged(const QualifiedName& attrName)
{
    SVGElement::svgAttributeChanged(attrName);

    // If we're the child of a resource element, be sure to invalidate it.
    invalidateResourcesInAncestorChain();

    SVGDocumentExtensions* extensions = document()->accessSVGExtensions();
    if (!extensions)
        return;

    // TODO: Fix bug http://bugs.webkit.org/show_bug.cgi?id=15430 (SVGElementInstances should rebuild themselves lazily)

    // In case we're referenced by a <use> element, we have element instances registered
    // to us in the SVGDocumentExtensions. If notifyAttributeChange() is called, we need
    // to recursively update all children including ourselves.
    updateElementInstance(extensions);
}

void SVGStyledElement::invalidateResourcesInAncestorChain() const
{
    Node* node = parentNode();
    while (node) {
        if (!node->isSVGElement())
            break;

        SVGElement* element = static_cast<SVGElement*>(node);
        if (SVGStyledElement* styledElement = static_cast<SVGStyledElement*>(element->isStyled() ? element : 0)) {
            if (SVGResource* resource = styledElement->canvasResource())
                resource->invalidate();
        }

        node = node->parentNode();
    }
}

void SVGStyledElement::childrenChanged(bool changedByParser)
{
    SVGElement::childrenChanged(changedByParser);
    if (document()->parsing())
        return;

    SVGDocumentExtensions* extensions = document()->accessSVGExtensions();
    if (!extensions)
        return;

    // TODO: Fix bug http://bugs.webkit.org/show_bug.cgi?id=15430 (SVGElementInstances should rebuild themselves lazily)

    // In case we're referenced by a <use> element, we have element instances registered
    // to us in the SVGDocumentExtensions. If childrenChanged() is called, we need
    // to recursively update all children including ourselves.
    updateElementInstance(extensions);
}

void SVGStyledElement::updateElementInstance(SVGDocumentExtensions* extensions) const
{
    SVGStyledElement* nonConstThis = const_cast<SVGStyledElement*>(this);
    HashSet<SVGElementInstance*>* set = extensions->instancesForElement(nonConstThis);
    if (!set || set->isEmpty())
        return;

    // We need to be careful here, as the instancesForElement
    // hash set may be modified after we call updateInstance! 
    HashSet<SVGElementInstance*> localCopy;

    // First create a local copy of the hashset
    HashSet<SVGElementInstance*>::const_iterator it1 = set->begin();
    const HashSet<SVGElementInstance*>::const_iterator end1 = set->end();

    for (; it1 != end1; ++it1)
        localCopy.add(*it1);

    // Actually nofify instances to update
    HashSet<SVGElementInstance*>::const_iterator it2 = localCopy.begin();
    const HashSet<SVGElementInstance*>::const_iterator end2 = localCopy.end();

    for (; it2 != end2; ++it2)
        (*it2)->updateInstance(nonConstThis);
}

RenderStyle* SVGStyledElement::resolveStyle(RenderStyle* parentStyle)
{
    if (renderer()) {
        RenderStyle* renderStyle = renderer()->style();
        renderStyle->ref();
        return renderStyle;
    }

    return document()->styleSelector()->styleForElement(this, parentStyle);
}

PassRefPtr<CSSValue> SVGStyledElement::getPresentationAttribute(const String& name)
{
    MappedAttribute* cssSVGAttr = mappedAttributes()->getAttributeItem(name);
    if (!cssSVGAttr || !cssSVGAttr->style())
        return 0;
    return cssSVGAttr->style()->getPropertyCSSValue(name);
}

void SVGStyledElement::detach()
{
    SVGResource::removeClient(this);
    SVGElement::detach();
}

}

#endif // ENABLE(SVG)