multi_column_fragmentainer_group.h | Explore in Territory

// Copyright 2015 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_MULTI_COLUMN_FRAGMENTAINER_GROUP_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_MULTI_COLUMN_FRAGMENTAINER_GROUP_H_

#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/layout_multi_column_flow_thread.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"

namespace blink {

struct LogicalRect;

// A group of columns, that are laid out in the inline progression direction,
// all with the same column height.
//
// When a multicol container is inside another fragmentation context, and said
// multicol container lives in multiple outer fragmentainers (pages / columns),
// we need to put these inner columns into separate groups, with one group per
// outer fragmentainer. Such a group of columns is what comprises a "row of
// column boxes" in spec lingo.
//
// Column balancing, when enabled, takes place within a column fragmentainer
// group.
//
// Each fragmentainer group may have its own actual column count (if there are
// unused columns because of forced breaks, for example). If there are multiple
// fragmentainer groups, the actual column count must not exceed the used column
// count (the one calculated based on column-count and column-width from CSS),
// or they'd overflow the outer fragmentainer in the inline direction. If we
// need more columns than what a group has room for, we'll create another group
// and put them there (and make them appear in the next outer fragmentainer).
class CORE_EXPORT MultiColumnFragmentainerGroup { … };

// List of all fragmentainer groups within a column set. There will always be at
// least one group. Deleting the one group is not allowed (or possible). There
// will be more than one group if the owning column set lives in multiple outer
// fragmentainers (e.g. multicol inside paged media).
class CORE_EXPORT MultiColumnFragmentainerGroupList { … };

}  // namespace blink

WTF_ALLOW_CLEAR_UNUSED_SLOTS_WITH_MEM_FUNCTIONS(…)

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_MULTI_COLUMN_FRAGMENTAINER_GROUP_H_
chromium/third_party/blink/renderer/core/layout/multi_column_fragmentainer_group.h
