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