third_party/WebKit/Source/core/svg/SVGGElement.cpp

   1 /*
   2  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
   3  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@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 #include "core/svg/SVGGElement.h"
  23
  24 #include "core/SVGNames.h"
  25 #include "core/layout/svg/LayoutSVGHiddenContainer.h"
  26 #include "core/layout/svg/LayoutSVGTransformableContainer.h"
  27
  28 namespace blink {
  29
  30 inline SVGGElement::SVGGElement(Document& document, ConstructionType constructionType)
  31     : SVGGraphicsElement(SVGNames::gTag, document, constructionType)
  32 {
  33 }
  34
  35 DEFINE_NODE_FACTORY(SVGGElement)
  36
  37 LayoutObject* SVGGElement::createLayoutObject(const ComputedStyle& style)
  38 {
  39     // SVG 1.1 testsuite explicitely uses constructs like <g display="none"><linearGradient>
  40     // We still have to create layoutObjects for the <g> & <linearGradient> element, though the
  41     // subtree may be hidden - we only want the resource layoutObjects to exist so they can be
  42     // referenced from somewhere else.
  43     if (style.display() == NONE)
  44         return new LayoutSVGHiddenContainer(this);
  45
  46     return new LayoutSVGTransformableContainer(this);
  47 }
  48
  49 bool SVGGElement::layoutObjectIsNeeded(const ComputedStyle&)
  50 {
  51     // Unlike SVGElement::layoutObjectIsNeeded(), we still create layoutObjects, even if
  52     // display is set to 'none' - which is special to SVG <g> container elements.
  53     return parentOrShadowHostElement() && parentOrShadowHostElement()->isSVGElement();
  54 }
  55
  56 }