GridLine.h

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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 
#pragma once
 
#include <cstdint>
 
namespace facebook::yoga {
 
// https://www.w3.org/TR/css-grid-1/#typedef-grid-row-start-grid-line
enum class GridLineType : uint8_t {
  Auto,
  Integer,
  Span,
};
 
struct GridLine {
  GridLineType type{};
  // Line position (1, 2, -1, -2, etc)
  int32_t integer{};
 
  constexpr static GridLine auto_() {
    return GridLine{.type = GridLineType::Auto, .integer = 0};
  }
 
  constexpr static GridLine fromInteger(int32_t value) {
    return GridLine{.type = GridLineType::Integer, .integer = value};
  }
 
  constexpr static GridLine span(int32_t value) {
    return GridLine{.type = GridLineType::Span, .integer = value};
  }
 
  constexpr bool isAuto() const {
    return type == GridLineType::Auto;
  }
 
  constexpr bool isInteger() const {
    return type == GridLineType::Integer;
  }
 
  constexpr bool isSpan() const {
    return type == GridLineType::Span;
  }
 
  bool operator==(const GridLine& other) const = default;
};
 
} // namespace facebook::yoga