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      1 /*
      2  * Copyright (C) 2007 Eric Seidel <eric (at) webkit.org>
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #include "config.h"
     21 
     22 #if ENABLE(SVG)
     23 #include "RenderSVGGradientStop.h"
     24 
     25 #include "RenderSVGResourceContainer.h"
     26 #include "SVGGradientElement.h"
     27 #include "SVGNames.h"
     28 #include "SVGResourcesCache.h"
     29 #include "SVGStopElement.h"
     30 
     31 namespace WebCore {
     32 
     33 using namespace SVGNames;
     34 
     35 RenderSVGGradientStop::RenderSVGGradientStop(SVGStopElement* element)
     36     : RenderObject(element)
     37 {
     38 }
     39 
     40 RenderSVGGradientStop::~RenderSVGGradientStop()
     41 {
     42 }
     43 
     44 void RenderSVGGradientStop::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
     45 {
     46     RenderObject::styleDidChange(diff, oldStyle);
     47     if (diff == StyleDifferenceEqual)
     48         return;
     49 
     50     // <stop> elements should only be allowed to make renderers under gradient elements
     51     // but I can imagine a few cases we might not be catching, so let's not crash if our parent isn't a gradient.
     52     SVGGradientElement* gradient = gradientElement();
     53     if (!gradient)
     54         return;
     55 
     56     RenderObject* renderer = gradient->renderer();
     57     if (!renderer)
     58         return;
     59 
     60     ASSERT(renderer->isSVGResourceContainer());
     61     RenderSVGResourceContainer* container = renderer->toRenderSVGResourceContainer();
     62     container->removeAllClientsFromCache();
     63 }
     64 
     65 void RenderSVGGradientStop::layout()
     66 {
     67     setNeedsLayout(false);
     68 }
     69 
     70 SVGGradientElement* RenderSVGGradientStop::gradientElement() const
     71 {
     72     ContainerNode* parentNode = node()->parentNode();
     73     if (parentNode->hasTagName(linearGradientTag) || parentNode->hasTagName(radialGradientTag))
     74         return static_cast<SVGGradientElement*>(parentNode);
     75     return 0;
     76 }
     77 
     78 }
     79 
     80 #endif // ENABLE(SVG)
     81