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// Copyright 2020 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.
#include "third_party/blink/renderer/core/layout/ng/table/ng_table_section_layout_algorithm.h"
#include "third_party/blink/renderer/core/layout/ng/ng_block_break_token.h"
#include "third_party/blink/renderer/core/layout/ng/ng_constraint_space_builder.h"
#include "third_party/blink/renderer/core/layout/ng/ng_out_of_flow_layout_part.h"
#include "third_party/blink/renderer/core/layout/ng/ng_physical_box_fragment.h"
namespace blink {
NGTableSectionLayoutAlgorithm::NGTableSectionLayoutAlgorithm(
const NGLayoutAlgorithmParams& params)
: NGLayoutAlgorithm(params) {}
// Generated fragment structure:
// +-----section--------------+
// | vspacing |
// | +--------------------+ |
// | | row | |
// | +--------------------+ |
// | vspacing |
// | +--------------------+ |
// | | row | |
// | +--------------------+ |
// | vspacing |
// +--------------------------+
scoped_refptr<const NGLayoutResult> NGTableSectionLayoutAlgorithm::Layout() {
const NGTableConstraintSpaceData& table_data = *ConstraintSpace().TableData();
wtf_size_t section_index = ConstraintSpace().TableSectionIndex();
absl::optional<LayoutUnit> section_baseline;
const LogicalSize available_size = {container_builder_.InlineSize(),
kIndefiniteSize};
LogicalOffset offset;
bool is_first_row = true;
wtf_size_t row_index = table_data.sections[section_index].start_row_index;
for (NGBlockNode row = To<NGBlockNode>(Node().FirstChild()); row;
row = To<NGBlockNode>(row.NextSibling())) {
DCHECK_LT(row_index, table_data.sections[section_index].start_row_index +
table_data.sections[section_index].rowspan);
NGConstraintSpaceBuilder row_space_builder(
table_data.table_writing_direction.GetWritingMode(),
table_data.table_writing_direction,
/* is_new_fc */ true);
row_space_builder.SetAvailableSize(available_size);
row_space_builder.SetPercentageResolutionSize(available_size);
row_space_builder.SetIsFixedInlineSize(true);
row_space_builder.SetTableRowData(&table_data, row_index);
NGConstraintSpace row_space = row_space_builder.ToConstraintSpace();
scoped_refptr<const NGLayoutResult> row_result = row.Layout(row_space);
if (is_first_row) {
const NGPhysicalBoxFragment& physical_fragment =
To<NGPhysicalBoxFragment>(row_result->PhysicalFragment());
DCHECK(physical_fragment.Baseline());
section_baseline = physical_fragment.Baseline();
} else if (!table_data.rows[row_index].is_collapsed) {
offset.block_offset += table_data.table_border_spacing.block_size;
}
container_builder_.AddResult(*row_result, offset);
offset.block_offset += table_data.rows[row_index].block_size;
is_first_row = false;
row_index++;
}
if (ConstraintSpace().IsFixedBlockSize()) {
// A fixed block-size should only occur for a section without children.
DCHECK_EQ(table_data.sections[section_index].rowspan, 0u);
container_builder_.SetFragmentBlockSize(
ConstraintSpace().AvailableSize().block_size);
} else {
container_builder_.SetFragmentBlockSize(offset.block_offset);
}
if (section_baseline)
container_builder_.SetBaseline(*section_baseline);
container_builder_.SetIsTableNGPart();
NGOutOfFlowLayoutPart(Node(), ConstraintSpace(), &container_builder_).Run();
return container_builder_.ToBoxFragment();
}
} // namespace blink
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