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 THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_POSITION_H_ 32 #define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_POSITION_H_ 33 34 #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" 35 #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h" 36 37 namespace blink { 38 39 enum GridPositionType { 40 kAutoPosition, 41 kExplicitPosition, // [ <integer> || <string> ] 42 kSpanPosition, // span && [ <integer> || <string> ] 43 kNamedGridAreaPosition // <ident> 44 }; 45 46 class GridPosition { 47 DISALLOW_NEW(); 48 49 public: GridPosition()50 GridPosition() : type_(kAutoPosition), integer_position_(0) {} 51 IsPositive()52 bool IsPositive() const { return IntegerPosition() > 0; } 53 GetType()54 GridPositionType GetType() const { return type_; } IsAuto()55 bool IsAuto() const { return type_ == kAutoPosition; } IsSpan()56 bool IsSpan() const { return type_ == kSpanPosition; } IsNamedGridArea()57 bool IsNamedGridArea() const { return type_ == kNamedGridAreaPosition; } 58 SetExplicitPosition(int position,const AtomicString & named_grid_line)59 void SetExplicitPosition(int position, const AtomicString& named_grid_line) { 60 type_ = kExplicitPosition; 61 integer_position_ = position; 62 named_grid_line_ = named_grid_line; 63 } 64 SetAutoPosition()65 void SetAutoPosition() { 66 type_ = kAutoPosition; 67 integer_position_ = 0; 68 } 69 70 // 'span' values cannot be negative, yet we reuse the <integer> position which 71 // can be. This means that we have to convert the span position to an integer, 72 // losing some precision here. It shouldn't be an issue in practice though. SetSpanPosition(int position,const AtomicString & named_grid_line)73 void SetSpanPosition(int position, const AtomicString& named_grid_line) { 74 type_ = kSpanPosition; 75 integer_position_ = position; 76 named_grid_line_ = named_grid_line; 77 } 78 SetNamedGridArea(const AtomicString & named_grid_area)79 void SetNamedGridArea(const AtomicString& named_grid_area) { 80 type_ = kNamedGridAreaPosition; 81 named_grid_line_ = named_grid_area; 82 } 83 IntegerPosition()84 int IntegerPosition() const { 85 DCHECK_EQ(GetType(), kExplicitPosition); 86 return integer_position_; 87 } 88 NamedGridLine()89 AtomicString NamedGridLine() const { 90 DCHECK(GetType() == kExplicitPosition || GetType() == kSpanPosition || 91 GetType() == kNamedGridAreaPosition); 92 return named_grid_line_; 93 } 94 SpanPosition()95 int SpanPosition() const { 96 DCHECK_EQ(GetType(), kSpanPosition); 97 return integer_position_; 98 } 99 100 bool operator==(const GridPosition& other) const { 101 return type_ == other.type_ && 102 integer_position_ == other.integer_position_ && 103 named_grid_line_ == other.named_grid_line_; 104 } 105 106 bool operator!=(const GridPosition& other) const { return !(*this == other); } 107 ShouldBeResolvedAgainstOppositePosition()108 bool ShouldBeResolvedAgainstOppositePosition() const { 109 return IsAuto() || IsSpan(); 110 } 111 112 private: 113 GridPositionType type_; 114 int integer_position_; 115 AtomicString named_grid_line_; 116 }; 117 118 } // namespace blink 119 120 #endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_POSITION_H_ 121