chromium/third_party/blink/renderer/core/layout/grid/grid_data.h

// Copyright 2020 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_LAYOUT_GRID_GRID_DATA_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_GRID_GRID_DATA_H_

#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/grid/grid_line_resolver.h"
#include "third_party/blink/renderer/core/layout/grid/grid_subtree.h"
#include "third_party/blink/renderer/core/layout/grid/grid_track_collection.h"
#include "third_party/blink/renderer/platform/wtf/ref_counted.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"

namespace blink {

struct CORE_EXPORT GridPlacementData { … };

namespace {

bool AreEqual(const std::unique_ptr<GridLayoutTrackCollection>& lhs,
              const std::unique_ptr<GridLayoutTrackCollection>& rhs) { … }

}  // namespace

// This struct contains the column and row data necessary to layout grid items.
// For grid sizing, it will store |GridSizingTrackCollection| pointers, which
// are able to modify the geometry of its sets. However, after sizing is done,
// it should only copy |GridLayoutTrackCollection| immutable data.
class CORE_EXPORT GridLayoutData { … };

// Subgrid layout relies on the root grid to perform the track sizing algorithm
// for every level of nested subgrids. This class contains the finalized layout
// data of every node in a grid tree (see `grid_subtree.h`), which will be
// passed down to the constraint space of a subgrid to perform layout.
//
// Note that this class allows subtrees to be compared for equality; this is
// important because when we store this tree within a constraint space we want
// to be able to invalidate the cached layout result of a subgrid based on
// whether the provided subtree's track were sized exactly the same.
class GridLayoutTree : public RefCounted<GridLayoutTree> { … };

// This class represents a subtree in a `GridLayoutTree` and mostly serves two
// purposes: provide seamless iteration over the tree structure and compare
// input subtrees to invalidate a subgrid's cached layout result.
class GridLayoutSubtree
    : public GridSubtree<GridLayoutSubtree,
                         scoped_refptr<const GridLayoutTree>> { … };

}  // namespace blink

WTF_ALLOW_CLEAR_UNUSED_SLOTS_WITH_MEM_FUNCTIONS(…)

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_GRID_GRID_DATA_H_