sky/engine/platform/CalculationValue.h

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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#ifndef SKY_ENGINE_PLATFORM_CALCULATIONVALUE_H_
#define SKY_ENGINE_PLATFORM_CALCULATIONVALUE_H_

#include "sky/engine/platform/Length.h"
#include "sky/engine/platform/LengthFunctions.h"
#include "sky/engine/wtf/OwnPtr.h"
#include "sky/engine/wtf/PassOwnPtr.h"
#include "sky/engine/wtf/RefCounted.h"

namespace blink {

class PLATFORM_EXPORT CalculationValue : public RefCounted<CalculationValue> {
public:
    static PassRefPtr<CalculationValue> create(PixelsAndPercent value, ValueRange range)
    {
        return adoptRef(new CalculationValue(value, range));
    }

    float evaluate(float maxValue) const { return pixels() + percent() / 100 * maxValue; }
    bool operator==(const CalculationValue& o) const { return pixels() == o.pixels() && percent() == o.percent(); }
    bool isNonNegative() const { return m_isNonNegative; }
    float pixels() const { return m_value.pixels; }
    float percent() const { return m_value.percent; }
    PixelsAndPercent pixelsAndPercent() const { return m_value; }

private:
    CalculationValue(PixelsAndPercent value, ValueRange range)
        : m_value(value)
        , m_isNonNegative(range == ValueRangeNonNegative)
    {
    }

    PixelsAndPercent m_value;
    bool m_isNonNegative;
};

} // namespace blink

#endif  // SKY_ENGINE_PLATFORM_CALCULATIONVALUE_H_