Source/core/animation/AnimatableNeutral.h

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * 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.
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 * 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
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 */

#ifndef AnimatableNeutral_h
#define AnimatableNeutral_h

#include "core/animation/AnimatableValue.h"

namespace WebCore {

class AnimatableNeutral : public AnimatableValue {
public:
    virtual ~AnimatableNeutral() { }

    virtual PassRefPtr<CSSValue> toCSSValue() const OVERRIDE
    {
        ASSERT_NOT_REACHED();
        return 0;
    }

    virtual bool isNeutral() const OVERRIDE { return true; }

protected:
    static PassRefPtr<AnimatableNeutral> create() { return adoptRef(new AnimatableNeutral()); }

    virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue* value, double fraction) const OVERRIDE
    {
        ASSERT_NOT_REACHED();
        return 0;
    }

    virtual PassRefPtr<AnimatableValue> addWith(const AnimatableValue* value) const OVERRIDE { return defaultAddWith(this, value); }

private:
    AnimatableNeutral() : AnimatableValue(TypeNeutral) { }

    friend class AnimatableValue;
};

} // namespace WebCore

#endif // AnimatableNeutral_h