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// Copyright 2017 The Chromium Authors. All rights reserved.
// 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_TABLE_GRID_CELL_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_TABLE_GRID_CELL_H_
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class LayoutTableCell;
// TableGridCell represents a single unit in the table grid.
// - Without rowspan and colspan, TableGridCells and LayoutTableCells have 1:1
// relationship.
// - A LayoutTableCell spanning multiple rows or effective columns can cover
// multiple TableGridCells.
// - Multiple LayoutTableCells can span into the same TableGridCell, e.g.
// <tr><td>A</td><td rowspan="2">B</td></tr>
// <tr><td colspan="2">C></td></tr>
// both LayoutTableCell B and C cover the TableGridCell at (1,1).
class TableGridCell {
DISALLOW_NEW();
public:
// We can't inline the constructor and destructor because cells_ needs full
// definition of LayoutTableCell, and we can't include LayoutTableCell.h
// from this file due to circular includes.
TableGridCell();
~TableGridCell();
// This is the LayoutTableCell covering this TableGridCell that is on top of
// the others (aka the last LayoutTableCell in DOM order for this
// TableGridCell).
//
// The concept of a primary cell is dubious at most as it doesn't correspond
// to a DOM or rendering concept. Also callers should be careful about
// assumptions about it. For example, even though the primary cell is visibly
// the top most, it is not guaranteed to be the only one visible for this
// unit due to different visual overflow rectangles.
LayoutTableCell* PrimaryCell() {
return HasCells() ? cells_.back() : nullptr;
}
const LayoutTableCell* PrimaryCell() const {
return const_cast<TableGridCell*>(this)->PrimaryCell();
}
bool HasCells() const { return cells_.size() > 0; }
Vector<LayoutTableCell*, 1>& Cells() { return cells_; }
const Vector<LayoutTableCell*, 1>& Cells() const { return cells_; }
bool InColSpan() const { return in_col_span_; }
void SetInColSpan(bool in_col_span) { in_col_span_ = in_col_span; }
private:
// All LayoutTableCells covering this TableGridCell.
// Due to colspan / rowpsan, it is possible to have overlapping cells
// (see class comment about an example).
// This Vector is sorted in DOM order.
Vector<LayoutTableCell*, 1> cells_;
// True for columns after the first in a colspan.
bool in_col_span_ = false;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_TABLE_GRID_CELL_H_
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