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: GridLength(const Length & length)43 GridLength(const Length& length) 44 : m_length(length) 45 , m_flex(0) 46 , m_type(LengthType) 47 { 48 ASSERT(!length.isUndefined()); 49 } 50 GridLength(double flex)51 explicit GridLength(double flex) 52 : m_flex(flex) 53 , m_type(FlexType) 54 { 55 } 56 isLength()57 bool isLength() const { return m_type == LengthType; } isFlex()58 bool isFlex() const { return m_type == FlexType; } 59 length()60 const Length& length() const { ASSERT(isLength()); return m_length; } 61 flex()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 isContentSized()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