1/*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef CalculationValue_h
32#define CalculationValue_h
33
34#include "platform/Length.h"
35#include "platform/LengthFunctions.h"
36#include "wtf/OwnPtr.h"
37#include "wtf/PassOwnPtr.h"
38#include "wtf/RefCounted.h"
39
40namespace blink {
41
42class PLATFORM_EXPORT CalculationValue : public RefCounted<CalculationValue> {
43public:
44    static PassRefPtr<CalculationValue> create(PixelsAndPercent value, ValueRange range)
45    {
46        return adoptRef(new CalculationValue(value, range));
47    }
48
49    float evaluate(float maxValue) const { return pixels() + percent() / 100 * maxValue; }
50    bool operator==(const CalculationValue& o) const { return pixels() == o.pixels() && percent() == o.percent(); }
51    bool isNonNegative() const { return m_isNonNegative; }
52    float pixels() const { return m_value.pixels; }
53    float percent() const { return m_value.percent; }
54    PixelsAndPercent pixelsAndPercent() const { return m_value; }
55
56private:
57    CalculationValue(PixelsAndPercent value, ValueRange range)
58        : m_value(value)
59        , m_isNonNegative(range == ValueRangeNonNegative)
60    {
61    }
62
63    PixelsAndPercent m_value;
64    bool m_isNonNegative;
65};
66
67} // namespace blink
68
69#endif // CalculationValue_h
70