chromium/third_party/blink/renderer/core/layout/custom/custom_layout_scope.h

// Copyright 2019 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_CUSTOM_CUSTOM_LAYOUT_SCOPE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_CUSTOM_CUSTOM_LAYOUT_SCOPE_H_

#include "base/check_op.h"
#include "third_party/blink/renderer/core/layout/custom/custom_layout_work_task.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_vector.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"

namespace blink {

// The work queue is a list of work tasks which will either produce fragment(s)
// or intrinsic-size(s) for the custom-layout class.
CustomLayoutWorkQueue;

// This heap allocated class is used to indicate which custom-layout (heap)
// objects are still valid.
//
// Any objects which have a pointer to this object with |is_detached_| being
// true, or not matching the current scope token should be considered invalid.
class CustomLayoutToken : public GarbageCollected<CustomLayoutToken> { … };

// This scope object is used to track which custom-layout (heap) objects are
// valid.
//
// Also maintains the current work queue. Work should only be pushed onto this
// queue if this is the current scope.
class CustomLayoutScope { … };

inline bool CustomLayoutToken::IsValid() const { … }

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_CUSTOM_CUSTOM_LAYOUT_SCOPE_H_