third_party/WebKit/Source/core/svg/properties/SVGProperty.h

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef SVGProperty_h
#define SVGProperty_h

#include "core/svg/properties/SVGPropertyInfo.h"
#include "platform/heap/Handle.h"
#include "wtf/Noncopyable.h"
#include "wtf/text/WTFString.h"

namespace blink {

class SVGElement;
class SVGAnimationElement;

class SVGPropertyBase : public GarbageCollectedFinalized<SVGPropertyBase> {
  WTF_MAKE_NONCOPYABLE(SVGPropertyBase);

 public:
  // Properties do not have a primitive type by default
  typedef void PrimitiveType;

  virtual ~SVGPropertyBase() {}

  // FIXME: remove this in WebAnimations transition.
  // This is used from SVGAnimatedNewPropertyAnimator for its animate-by-string
  // implementation.
  virtual SVGPropertyBase* cloneForAnimation(const String&) const = 0;

  virtual String valueAsString() const = 0;

  // FIXME: remove below and just have this inherit AnimatableValue in
  // WebAnimations transition.
  virtual void add(SVGPropertyBase*, SVGElement*) = 0;
  virtual void calculateAnimatedValue(SVGAnimationElement*,
                                      float percentage,
                                      unsigned repeatCount,
                                      SVGPropertyBase* from,
                                      SVGPropertyBase* to,
                                      SVGPropertyBase* toAtEndOfDurationValue,
                                      SVGElement*) = 0;
  virtual float calculateDistance(SVGPropertyBase* to, SVGElement*) = 0;

  virtual AnimatedPropertyType type() const = 0;

  SVGPropertyBase* ownerList() const { return m_ownerList; }

  void setOwnerList(SVGPropertyBase* ownerList) {
    // Previous owner list must be cleared before setting new owner list.
    ASSERT((!ownerList && m_ownerList) || (ownerList && !m_ownerList));

    m_ownerList = ownerList;
  }

  DEFINE_INLINE_VIRTUAL_TRACE() {}

 protected:
  SVGPropertyBase() : m_ownerList(nullptr) {}

 private:
  // Oilpan: the back reference to the owner should be a Member, but this can
  // create cycles when SVG properties meet the off-heap InterpolationValue
  // hierarchy.  Not tracing it is safe, albeit an undesirable state of affairs.
  // See http://crbug.com/528275 for the detail.
  UntracedMember<SVGPropertyBase> m_ownerList;
};

#define DEFINE_SVG_PROPERTY_TYPE_CASTS(thisType)            \
  DEFINE_TYPE_CASTS(thisType, SVGPropertyBase, value,       \
                    value->type() == thisType::classType(), \
                    value.type() == thisType::classType());

}  // namespace blink

#endif  // SVGProperty_h