third_party/WebKit/Source/core/layout/svg/LayoutSVGGradientStop.h

   1 /*
   2  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
   3  * Copyright (C) 2009 Google, Inc.
   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 #ifndef LayoutSVGGradientStop_h
  22 #define LayoutSVGGradientStop_h
  23
  24 #include "core/layout/LayoutObject.h"
  25
  26 namespace blink {
  27
  28 class SVGGradientElement;
  29 class SVGStopElement;
  30
  31 // This class exists mostly so we can hear about gradient stop style changes
  32 class LayoutSVGGradientStop final : public LayoutObject {
  33 public:
  34     explicit LayoutSVGGradientStop(SVGStopElement*);
  35     ~LayoutSVGGradientStop() override;
  36
  37     const char* name() const override { return "LayoutSVGGradientStop"; }
  38     bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectSVG || type == LayoutObjectSVGGradientStop || LayoutObject::isOfType(type); }
  39
  40     void layout() override;
  41
  42     // This overrides are needed to prevent ASSERTs on <svg><stop /></svg>
  43     // LayoutObject's default implementations ASSERT_NOT_REACHED()
  44     // https://bugs.webkit.org/show_bug.cgi?id=20400
  45     LayoutRect clippedOverflowRectForPaintInvalidation(const LayoutBoxModelObject*, const PaintInvalidationState* = nullptr) const override { return LayoutRect(); }
  46     FloatRect objectBoundingBox() const override { return FloatRect(); }
  47     FloatRect strokeBoundingBox() const override { return FloatRect(); }
  48     FloatRect paintInvalidationRectInLocalCoordinates() const override { return FloatRect(); }
  49
  50 protected:
  51     void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
  52
  53 private:
  54     SVGGradientElement* gradientElement() const;
  55 };
  56
  57 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGGradientStop, isSVGGradientStop());
  58
  59 }
  60
  61 #endif // LayoutSVGGradientStop_h