1/*
2 * Copyright (C) 2013 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 GridLength_h
32#define GridLength_h
33
34#include "platform/Length.h"
35
36namespace WebCore {
37
38// This class wraps the <track-breadth> which can be either a <percentage>, <length>, min-content, max-content
39// or <flex>. This class avoids spreading the knowledge of <flex> throughout the rendering directory by adding
40// an new unit to Length.h.
41class GridLength {
42public:
43    GridLength()
44        : m_length(Undefined)
45        , m_flex(0)
46        , m_type(LengthType)
47    {
48    }
49
50    GridLength(const Length& length)
51        : m_length(length)
52        , m_flex(0)
53        , m_type(LengthType)
54    {
55    }
56
57    bool isLength() const { return m_type == LengthType; }
58    bool isFlex() const { return m_type == FlexType; }
59
60    const Length& length() const { ASSERT(isLength()); return m_length; }
61    Length& length() { ASSERT(isLength()); return m_length; }
62
63    double flex() const { ASSERT(isFlex()); return m_flex; }
64    void setFlex(double flex)
65    {
66        m_type = FlexType;
67        m_flex = flex;
68    }
69
70    bool operator==(const GridLength& o) const
71    {
72        return m_length == o.m_length && m_flex == o.m_flex && m_type == o.m_type;
73    }
74
75    bool isContentSized() const { return m_type == LengthType && (m_length.isAuto() || m_length.isMinContent() || m_length.isMaxContent()); }
76
77private:
78    // Ideally we would put the 2 following fields in a union, but Length has a constructor,
79    // a destructor and a copy assignment which isn't allowed.
80    Length m_length;
81    double m_flex;
82    enum GridLengthType {
83        LengthType,
84        FlexType
85    };
86    GridLengthType m_type;
87};
88
89} // namespace WebCore
90
91#endif // GridLength_h
92