1 /* 2 * Copyright (C) 2012 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 GridPosition_h 32 #define GridPosition_h 33 34 #include "wtf/text/WTFString.h" 35 36 namespace blink { 37 38 enum GridPositionType { 39 AutoPosition, 40 ExplicitPosition, // [ <integer> || <string> ] 41 SpanPosition, // span && [ <integer> || <string> ] 42 NamedGridAreaPosition // <ident> 43 }; 44 45 class GridPosition { 46 public: GridPosition()47 GridPosition() 48 : m_type(AutoPosition) 49 , m_integerPosition(0) 50 { 51 } 52 isPositive()53 bool isPositive() const { return integerPosition() > 0; } 54 type()55 GridPositionType type() const { return m_type; } isAuto()56 bool isAuto() const { return m_type == AutoPosition; } isSpan()57 bool isSpan() const { return m_type == SpanPosition; } isNamedGridArea()58 bool isNamedGridArea() const { return m_type == NamedGridAreaPosition; } 59 setExplicitPosition(int position,const String & namedGridLine)60 void setExplicitPosition(int position, const String& namedGridLine) 61 { 62 m_type = ExplicitPosition; 63 m_integerPosition = position; 64 m_namedGridLine = namedGridLine; 65 } 66 setAutoPosition()67 void setAutoPosition() 68 { 69 m_type = AutoPosition; 70 m_integerPosition = 0; 71 } 72 73 // 'span' values cannot be negative, yet we reuse the <integer> position which can 74 // be. This means that we have to convert the span position to an integer, losing 75 // some precision here. It shouldn't be an issue in practice though. setSpanPosition(int position,const String & namedGridLine)76 void setSpanPosition(int position, const String& namedGridLine) 77 { 78 m_type = SpanPosition; 79 m_integerPosition = position; 80 m_namedGridLine = namedGridLine; 81 } 82 setNamedGridArea(const String & namedGridArea)83 void setNamedGridArea(const String& namedGridArea) 84 { 85 m_type = NamedGridAreaPosition; 86 m_namedGridLine = namedGridArea; 87 } 88 integerPosition()89 int integerPosition() const 90 { 91 ASSERT(type() == ExplicitPosition); 92 return m_integerPosition; 93 } 94 namedGridLine()95 String namedGridLine() const 96 { 97 ASSERT(type() == ExplicitPosition || type() == SpanPosition || type() == NamedGridAreaPosition); 98 return m_namedGridLine; 99 } 100 spanPosition()101 int spanPosition() const 102 { 103 ASSERT(type() == SpanPosition); 104 return m_integerPosition; 105 } 106 107 bool operator==(const GridPosition& other) const 108 { 109 return m_type == other.m_type && m_integerPosition == other.m_integerPosition && m_namedGridLine == other.m_namedGridLine; 110 } 111 shouldBeResolvedAgainstOppositePosition()112 bool shouldBeResolvedAgainstOppositePosition() const 113 { 114 return isAuto() || isSpan(); 115 } 116 private: 117 GridPositionType m_type; 118 int m_integerPosition; 119 String m_namedGridLine; 120 }; 121 122 } // namespace blink 123 124 #endif // GridPosition_h 125