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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef AnimatableValue_h
#define AnimatableValue_h
#include "core/css/CSSValue.h"
#include "wtf/RefCounted.h"
namespace WebCore {
class AnimatableValue : public RefCounted<AnimatableValue> {
public:
virtual ~AnimatableValue() { }
static const AnimatableValue* neutralValue();
static PassRefPtr<AnimatableValue> interpolate(const AnimatableValue*, const AnimatableValue*, double fraction);
// For noncommutative values read add(A, B) to mean the value A with B composed onto it.
static PassRefPtr<AnimatableValue> add(const AnimatableValue*, const AnimatableValue*);
bool equals(const AnimatableValue* value) const
{
return isSameType(value) && equalTo(value);
}
bool equals(const AnimatableValue& value) const
{
return equals(&value);
}
bool isClipPathOperation() const { return type() == TypeClipPathOperation; }
bool isColor() const { return type() == TypeColor; }
bool isDouble() const { return type() == TypeDouble; }
bool isFilterOperations() const { return type() == TypeFilterOperations; }
bool isImage() const { return type() == TypeImage; }
bool isLength() const { return type() == TypeLength; }
bool isLengthBox() const { return type() == TypeLengthBox; }
bool isLengthBoxAndBool() const { return type() == TypeLengthBoxAndBool; }
bool isLengthPoint() const { return type() == TypeLengthPoint; }
bool isLengthSize() const { return type() == TypeLengthSize; }
bool isNeutral() const { return type() == TypeNeutral; }
bool isRepeatable() const { return type() == TypeRepeatable; }
bool isSVGLength() const { return type() == TypeSVGLength; }
bool isSVGPaint() const { return type() == TypeSVGPaint; }
bool isShadow() const { return type() == TypeShadow; }
bool isShapeValue() const { return type() == TypeShapeValue; }
bool isStrokeDasharrayList() const { return type() == TypeStrokeDasharrayList; }
bool isTransform() const { return type() == TypeTransform; }
bool isUnknown() const { return type() == TypeUnknown; }
bool isVisibility() const { return type() == TypeVisibility; }
bool isSameType(const AnimatableValue* value) const
{
ASSERT(value);
return value->type() == type();
}
bool usesNonDefaultInterpolationWith(const AnimatableValue* value) const
{
return isSameType(value) && !isUnknown();
}
protected:
enum AnimatableType {
TypeClipPathOperation,
TypeColor,
TypeDouble,
TypeFilterOperations,
TypeImage,
TypeLength,
TypeLengthBox,
TypeLengthBoxAndBool,
TypeLengthPoint,
TypeLengthSize,
TypeNeutral,
TypeRepeatable,
TypeSVGLength,
TypeSVGPaint,
TypeShadow,
TypeShapeValue,
TypeStrokeDasharrayList,
TypeTransform,
TypeUnknown,
TypeVisibility,
};
virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const = 0;
static PassRefPtr<AnimatableValue> defaultInterpolateTo(const AnimatableValue* left, const AnimatableValue* right, double fraction) { return takeConstRef((fraction < 0.5) ? left : right); }
// For noncommutative values read A->addWith(B) to mean the value A with B composed onto it.
virtual PassRefPtr<AnimatableValue> addWith(const AnimatableValue*) const;
static PassRefPtr<AnimatableValue> defaultAddWith(const AnimatableValue* left, const AnimatableValue* right) { return takeConstRef(right); }
template <class T>
static PassRefPtr<T> takeConstRef(const T* value) { return PassRefPtr<T>(const_cast<T*>(value)); }
private:
virtual AnimatableType type() const = 0;
// Implementations can assume that the object being compared has the same type as the object this is called on
virtual bool equalTo(const AnimatableValue*) const = 0;
};
#define DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(thisType, predicate) \
DEFINE_TYPE_CASTS(thisType, AnimatableValue, value, value->predicate, value.predicate)
} // namespace WebCore
#endif // AnimatableValue_h
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