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      1 /*
      2  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis (at) kde.org>
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #include "config.h"
     22 
     23 #include "core/svg/SVGGElement.h"
     24 
     25 #include "core/SVGNames.h"
     26 #include "core/rendering/svg/RenderSVGHiddenContainer.h"
     27 #include "core/rendering/svg/RenderSVGResource.h"
     28 #include "core/rendering/svg/RenderSVGTransformableContainer.h"
     29 
     30 namespace WebCore {
     31 
     32 inline SVGGElement::SVGGElement(Document& document, ConstructionType constructionType)
     33     : SVGGraphicsElement(SVGNames::gTag, document, constructionType)
     34 {
     35     ScriptWrappable::init(this);
     36 }
     37 
     38 DEFINE_NODE_FACTORY(SVGGElement)
     39 
     40 bool SVGGElement::isSupportedAttribute(const QualifiedName& attrName)
     41 {
     42     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     43     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     44 }
     45 
     46 void SVGGElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     47 {
     48     if (!isSupportedAttribute(name)) {
     49         SVGGraphicsElement::parseAttribute(name, value);
     50         return;
     51     }
     52 
     53     ASSERT_NOT_REACHED();
     54 }
     55 
     56 void SVGGElement::svgAttributeChanged(const QualifiedName& attrName)
     57 {
     58     if (!isSupportedAttribute(attrName)) {
     59         SVGGraphicsElement::svgAttributeChanged(attrName);
     60         return;
     61     }
     62 
     63     SVGElement::InvalidationGuard invalidationGuard(this);
     64 
     65     if (RenderObject* renderer = this->renderer())
     66         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
     67 }
     68 
     69 RenderObject* SVGGElement::createRenderer(RenderStyle* style)
     70 {
     71     // SVG 1.1 testsuite explicitely uses constructs like <g display="none"><linearGradient>
     72     // We still have to create renderers for the <g> & <linearGradient> element, though the
     73     // subtree may be hidden - we only want the resource renderers to exist so they can be
     74     // referenced from somewhere else.
     75     if (style->display() == NONE)
     76         return new RenderSVGHiddenContainer(this);
     77 
     78     return new RenderSVGTransformableContainer(this);
     79 }
     80 
     81 bool SVGGElement::rendererIsNeeded(const RenderStyle&)
     82 {
     83     // Unlike SVGElement::rendererIsNeeded(), we still create renderers, even if
     84     // display is set to 'none' - which is special to SVG <g> container elements.
     85     return parentOrShadowHostElement() && parentOrShadowHostElement()->isSVGElement();
     86 }
     87 
     88 }
     89