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      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 
     36 namespace 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.
     41 class GridLength {
     42 public:
     43     GridLength(const Length& length)
     44         : m_length(length)
     45         , m_flex(0)
     46         , m_type(LengthType)
     47     {
     48         ASSERT(!length.isUndefined());
     49     }
     50 
     51     explicit GridLength(double flex)
     52         : m_flex(flex)
     53         , m_type(FlexType)
     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 
     62     double flex() const { ASSERT(isFlex()); return m_flex; }
     63 
     64     bool operator==(const GridLength& o) const
     65     {
     66         return m_length == o.m_length && m_flex == o.m_flex && m_type == o.m_type;
     67     }
     68 
     69     bool isContentSized() const { return m_type == LengthType && (m_length.isAuto() || m_length.isMinContent() || m_length.isMaxContent()); }
     70 
     71 private:
     72     // Ideally we would put the 2 following fields in a union, but Length has a constructor,
     73     // a destructor and a copy assignment which isn't allowed.
     74     Length m_length;
     75     double m_flex;
     76     enum GridLengthType {
     77         LengthType,
     78         FlexType
     79     };
     80     GridLengthType m_type;
     81 };
     82 
     83 } // namespace WebCore
     84 
     85 #endif // GridLength_h
     86