| /* |
| * Copyright (C) 2012 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_POSITION_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_POSITION_H_ |
| |
| #include "third_party/blink/renderer/platform/wtf/allocator.h" |
| #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h" |
| |
| namespace blink { |
| |
| enum GridPositionType { |
| kAutoPosition, |
| kExplicitPosition, // [ <integer> || <string> ] |
| kSpanPosition, // span && [ <integer> || <string> ] |
| kNamedGridAreaPosition // <ident> |
| }; |
| |
| class GridPosition { |
| DISALLOW_NEW(); |
| |
| public: |
| GridPosition() : type_(kAutoPosition), integer_position_(0) {} |
| |
| bool IsPositive() const { return IntegerPosition() > 0; } |
| |
| GridPositionType GetType() const { return type_; } |
| bool IsAuto() const { return type_ == kAutoPosition; } |
| bool IsSpan() const { return type_ == kSpanPosition; } |
| bool IsNamedGridArea() const { return type_ == kNamedGridAreaPosition; } |
| |
| void SetExplicitPosition(int position, const AtomicString& named_grid_line) { |
| type_ = kExplicitPosition; |
| integer_position_ = position; |
| named_grid_line_ = named_grid_line; |
| } |
| |
| void SetAutoPosition() { |
| type_ = kAutoPosition; |
| integer_position_ = 0; |
| } |
| |
| // 'span' values cannot be negative, yet we reuse the <integer> position which |
| // can be. This means that we have to convert the span position to an integer, |
| // losing some precision here. It shouldn't be an issue in practice though. |
| void SetSpanPosition(int position, const AtomicString& named_grid_line) { |
| type_ = kSpanPosition; |
| integer_position_ = position; |
| named_grid_line_ = named_grid_line; |
| } |
| |
| void SetNamedGridArea(const AtomicString& named_grid_area) { |
| type_ = kNamedGridAreaPosition; |
| named_grid_line_ = named_grid_area; |
| } |
| |
| int IntegerPosition() const { |
| DCHECK_EQ(GetType(), kExplicitPosition); |
| return integer_position_; |
| } |
| |
| AtomicString NamedGridLine() const { |
| DCHECK(GetType() == kExplicitPosition || GetType() == kSpanPosition || |
| GetType() == kNamedGridAreaPosition); |
| return named_grid_line_; |
| } |
| |
| int SpanPosition() const { |
| DCHECK_EQ(GetType(), kSpanPosition); |
| return integer_position_; |
| } |
| |
| bool operator==(const GridPosition& other) const { |
| return type_ == other.type_ && |
| integer_position_ == other.integer_position_ && |
| named_grid_line_ == other.named_grid_line_; |
| } |
| |
| bool operator!=(const GridPosition& other) const { return !(*this == other); } |
| |
| bool ShouldBeResolvedAgainstOppositePosition() const { |
| return IsAuto() || IsSpan(); |
| } |
| |
| private: |
| GridPositionType type_; |
| int integer_position_; |
| AtomicString named_grid_line_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_GRID_POSITION_H_ |