chromium/third_party/blink/renderer/core/style/position_area.h

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_POSITION_AREA_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_POSITION_AREA_H_

#include <optional>

#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/css/anchor_query.h"
#include "third_party/blink/renderer/core/css/css_anchor_query_enums.h"
#include "third_party/blink/renderer/core/style/computed_style_constants.h"
#include "third_party/blink/renderer/platform/geometry/layout_unit.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"

namespace blink {

class WritingDirectionMode;

// Possible region end points for a computed <position-area-span>
enum class PositionAreaRegion : uint8_t { … };

// Represents the computed value for the position-area property. Each span is
// represented by two end points. That is:
//
//   "span-all" -> (kAll, kAll)
//   "center" -> (kCenter, kCenter)
//   "span-right" -> (kCenter, kRight)
//   "span-left" -> (kLeft, kCenter)
//   "top" -> (kTop, kTop)
//
// The axes are not ordered in a particular block/inline or vertical/
// horizontal order because the axes will be resolved at layout time (see
// ToPhysical() below).
class CORE_EXPORT PositionArea { … };

// Used to store inset offsets on ComputedStyle for adjusting the
// containing-block rectangle. All zeros means a span-all position-area is applied.
// Non-zero values refer to an anchor edge offset relative to the containing
// block rectangle.
struct PositionAreaOffsets { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_POSITION_AREA_H_