1/*
2 * Copyright (C) 2007 Eric Seidel <eric@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#include "core/rendering/svg/RenderSVGGradientStop.h"
23
24#include "SVGNames.h"
25#include "core/rendering/svg/RenderSVGResourceContainer.h"
26#include "core/svg/SVGGradientElement.h"
27#include "core/svg/SVGStopElement.h"
28
29namespace WebCore {
30
31using namespace SVGNames;
32
33RenderSVGGradientStop::RenderSVGGradientStop(SVGStopElement* element)
34    : RenderObject(element)
35{
36}
37
38RenderSVGGradientStop::~RenderSVGGradientStop()
39{
40}
41
42void RenderSVGGradientStop::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
43{
44    RenderObject::styleDidChange(diff, oldStyle);
45    if (diff == StyleDifferenceEqual)
46        return;
47
48    // <stop> elements should only be allowed to make renderers under gradient elements
49    // but I can imagine a few cases we might not be catching, so let's not crash if our parent isn't a gradient.
50    SVGGradientElement* gradient = gradientElement();
51    if (!gradient)
52        return;
53
54    RenderObject* renderer = gradient->renderer();
55    if (!renderer)
56        return;
57
58    ASSERT(renderer->isSVGResourceContainer());
59    RenderSVGResourceContainer* container = renderer->toRenderSVGResourceContainer();
60    container->removeAllClientsFromCache();
61}
62
63void RenderSVGGradientStop::layout()
64{
65    StackStats::LayoutCheckPoint layoutCheckPoint;
66    clearNeedsLayout();
67}
68
69SVGGradientElement* RenderSVGGradientStop::gradientElement() const
70{
71    ContainerNode* parentNode = node()->parentNode();
72    if (parentNode->hasTagName(linearGradientTag) || parentNode->hasTagName(radialGradientTag))
73        return toSVGGradientElement(parentNode);
74    return 0;
75}
76
77}
78