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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 blink {
     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     }
     49 
     50     explicit GridLength(double flex)
     51         : m_flex(flex)
     52         , m_type(FlexType)
     53     {
     54     }
     55 
     56     bool isLength() const { return m_type == LengthType; }
     57     bool isFlex() const { return m_type == FlexType; }
     58 
     59     const Length& length() const { ASSERT(isLength()); return m_length; }
     60 
     61     double flex() const { ASSERT(isFlex()); return m_flex; }
     62 
     63     bool isPercentage() const { return m_type == LengthType && m_length.isPercent(); }
     64 
     65     bool operator==(const GridLength& o) const
     66     {
     67         return m_length == o.m_length && m_flex == o.m_flex && m_type == o.m_type;
     68     }
     69 
     70     bool isContentSized() const { return m_type == LengthType && (m_length.isAuto() || m_length.isMinContent() || m_length.isMaxContent()); }
     71 
     72 private:
     73     // Ideally we would put the 2 following fields in a union, but Length has a constructor,
     74     // a destructor and a copy assignment which isn't allowed.
     75     Length m_length;
     76     double m_flex;
     77     enum GridLengthType {
     78         LengthType,
     79         FlexType
     80     };
     81     GridLengthType m_type;
     82 };
     83 
     84 } // namespace blink
     85 
     86 #endif // GridLength_h
     87