2a1e58f8cc
Previously, the minimum height of a table row was calculated based on the automatic height of the cells inner layout. This change makes computed height of a cell boxes also be considered if it has definite value.
577 lines
26 KiB
C++
577 lines
26 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/DOM/Node.h>
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#include <LibWeb/HTML/BrowsingContext.h>
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#include <LibWeb/Layout/Box.h>
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#include <LibWeb/Layout/InlineFormattingContext.h>
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#include <LibWeb/Layout/TableBox.h>
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#include <LibWeb/Layout/TableCellBox.h>
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#include <LibWeb/Layout/TableFormattingContext.h>
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#include <LibWeb/Layout/TableRowBox.h>
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#include <LibWeb/Layout/TableRowGroupBox.h>
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struct GridPosition {
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size_t x;
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size_t y;
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};
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inline bool operator==(GridPosition const& a, GridPosition const& b)
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{
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return a.x == b.x && a.y == b.y;
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}
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namespace AK {
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template<>
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struct Traits<GridPosition> : public GenericTraits<GridPosition> {
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static unsigned hash(GridPosition const& key)
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{
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return pair_int_hash(key.x, key.y);
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}
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};
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}
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namespace Web::Layout {
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TableFormattingContext::TableFormattingContext(LayoutState& state, TableBox const& root, FormattingContext* parent)
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: FormattingContext(Type::Table, state, root, parent)
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{
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}
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TableFormattingContext::~TableFormattingContext() = default;
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void TableFormattingContext::calculate_row_column_grid(Box const& box)
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{
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// Implements https://html.spec.whatwg.org/multipage/tables.html#forming-a-table
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HashMap<GridPosition, bool> grid;
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size_t x_width = 0, y_height = 0;
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size_t x_current = 0, y_current = 0;
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auto process_row = [&](auto& row) {
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if (y_height == y_current)
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y_height++;
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x_current = 0;
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while (x_current < x_width && grid.contains(GridPosition { x_current, y_current }))
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x_current++;
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for (auto* child = row.first_child(); child; child = child->next_sibling()) {
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if (is<TableCellBox>(*child)) {
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Box* box = static_cast<Box*>(child);
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if (x_current == x_width)
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x_width++;
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const size_t colspan = static_cast<TableCellBox*>(child)->colspan();
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const size_t rowspan = static_cast<TableCellBox*>(child)->rowspan();
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if (x_width < x_current + colspan)
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x_width = x_current + colspan;
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if (y_height < y_current + rowspan)
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y_height = y_current + rowspan;
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for (size_t y = y_current; y < y_current + rowspan; y++)
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for (size_t x = x_current; x < x_current + colspan; x++)
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grid.set(GridPosition { x, y }, true);
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m_cells.append(Cell { *box, x_current, y_current, colspan, rowspan });
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x_current += colspan;
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}
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}
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m_rows.append(Row { row });
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y_current++;
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};
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box.template for_each_child_of_type<TableRowGroupBox>([&](auto& row_group_box) {
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row_group_box.template for_each_child_of_type<TableRowBox>([&](auto& row) {
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process_row(row);
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return IterationDecision::Continue;
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});
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});
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box.template for_each_child_of_type<TableRowBox>([&](auto& row) {
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process_row(row);
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return IterationDecision::Continue;
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});
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m_columns.resize(x_width);
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}
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void TableFormattingContext::compute_table_measures()
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{
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size_t max_cell_column_span = 1;
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for (auto& cell : m_cells) {
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auto width_of_containing_block = m_state.get(*table_wrapper().containing_block()).content_width();
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auto width_of_containing_block_as_length = CSS::Length::make_px(width_of_containing_block);
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auto& computed_values = cell.box->computed_values();
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CSSPixels padding_left = computed_values.padding().left().resolved(cell.box, width_of_containing_block_as_length).to_px(cell.box);
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CSSPixels padding_right = computed_values.padding().right().resolved(cell.box, width_of_containing_block_as_length).to_px(cell.box);
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auto is_left_most_cell = cell.column_index == 0;
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auto is_right_most_cell = cell.column_index == m_columns.size() - 1;
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auto should_hide_borders = cell.box->computed_values().border_collapse() == CSS::BorderCollapse::Collapse;
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CSSPixels border_left = should_hide_borders && !is_left_most_cell ? 0 : computed_values.border_left().width;
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CSSPixels border_right = should_hide_borders && !is_right_most_cell ? 0 : computed_values.border_right().width;
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CSSPixels width = computed_values.width().resolved(cell.box, width_of_containing_block_as_length).to_px(cell.box);
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auto cell_intrinsic_offsets = padding_left + padding_right + border_left + border_right;
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auto min_content_width = calculate_min_content_width(cell.box);
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auto max_content_width = calculate_max_content_width(cell.box);
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CSSPixels min_width = min_content_width;
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if (!computed_values.min_width().is_auto())
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min_width = max(min_width, computed_values.min_width().resolved(cell.box, width_of_containing_block_as_length).to_px(cell.box));
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CSSPixels max_width = computed_values.width().is_auto() ? max_content_width.value() : width;
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if (!computed_values.max_width().is_none())
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max_width = min(max_width, computed_values.max_width().resolved(cell.box, width_of_containing_block_as_length).to_px(cell.box));
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auto computed_width = computed_values.width();
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if (computed_width.is_percentage()) {
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m_columns[cell.column_index].type = ColumnType::Percent;
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m_columns[cell.column_index].percentage_width = max(m_columns[cell.column_index].percentage_width, computed_width.percentage().value());
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} else if (computed_width.is_length()) {
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m_columns[cell.column_index].type = ColumnType::Pixel;
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}
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cell.min_width = min_width + cell_intrinsic_offsets;
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cell.max_width = max(max(width, min_width), max_width) + cell_intrinsic_offsets;
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max_cell_column_span = max(max_cell_column_span, cell.column_span);
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}
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for (auto& cell : m_cells) {
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if (cell.column_span == 1) {
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m_columns[cell.column_index].min_width = max(m_columns[cell.column_index].min_width, cell.min_width);
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m_columns[cell.column_index].max_width = max(m_columns[cell.column_index].max_width, cell.max_width);
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}
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}
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for (size_t current_column_span = 2; current_column_span < max_cell_column_span; current_column_span++) {
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// https://www.w3.org/TR/css-tables-3/#min-content-width-of-a-column-based-on-cells-of-span-up-to-n-n--1
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Vector<Vector<CSSPixels>> cell_min_contributions_by_column_index;
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cell_min_contributions_by_column_index.resize(m_columns.size());
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// https://www.w3.org/TR/css-tables-3/#max-content-width-of-a-column-based-on-cells-of-span-up-to-n-n--1
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Vector<Vector<CSSPixels>> cell_max_contributions_by_column_index;
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cell_max_contributions_by_column_index.resize(m_columns.size());
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for (auto& cell : m_cells) {
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if (cell.column_span == current_column_span) {
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// Define the baseline max-content width as the sum of the max-content widths based on cells of span up to N-1 of all columns that the cell spans.
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CSSPixels baseline_max_content_width = 0;
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auto cell_start_column_index = cell.column_index;
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auto cell_end_column_index = cell.column_index + cell.column_span;
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for (auto column_index = cell_start_column_index; column_index < cell_end_column_index; column_index++) {
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baseline_max_content_width += m_columns[column_index].max_width;
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}
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// The contribution of the cell is the sum of:
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// the min-content width of the column based on cells of span up to N-1
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auto cell_min_contribution = m_columns[cell.column_index].min_width;
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// and the product of:
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// - the ratio of the max-content width based on cells of span up to N-1 of the column to the baseline max-content width
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// - the outer min-content width of the cell minus the baseline max-content width and baseline border spacing, or 0 if this is negative
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cell_min_contribution += (m_columns[cell.column_index].max_width / baseline_max_content_width) * max(CSSPixels(0), cell.min_width - baseline_max_content_width);
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// The contribution of the cell is the sum of:
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// the max-content width of the column based on cells of span up to N-1
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auto cell_max_contribution = m_columns[cell.column_index].max_width;
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// and the product of:
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// - the ratio of the max-content width based on cells of span up to N-1 of the column to the baseline max-content width
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// - the outer max-content width of the cell minus the baseline max-content width and the baseline border spacing, or 0 if this is negative
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cell_max_contribution += (m_columns[cell.column_index].max_width / baseline_max_content_width) * max(CSSPixels(0), cell.max_width - baseline_max_content_width);
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cell_min_contributions_by_column_index[cell.column_index].append(cell_min_contribution);
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cell_max_contributions_by_column_index[cell.column_index].append(cell_max_contribution);
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}
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}
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for (size_t column_index = 0; column_index < m_columns.size(); column_index++) {
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// min-content width of a column based on cells of span up to N (N > 1) is
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// the largest of the min-content width of the column based on cells of span up to N-1 and the contributions of the cells in the column whose colSpan is N
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for (auto min_contribution : cell_min_contributions_by_column_index[column_index])
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m_columns[column_index].min_width = max(m_columns[column_index].min_width, min_contribution);
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// max-content width of a column based on cells of span up to N (N > 1) is
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// the largest of the max-content width based on cells of span up to N-1 and the contributions of the cells in the column whose colSpan is N
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for (auto max_contribution : cell_max_contributions_by_column_index[column_index])
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m_columns[column_index].max_width = max(m_columns[column_index].max_width, max_contribution);
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}
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}
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}
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void TableFormattingContext::compute_table_width()
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{
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auto& table_box_state = m_state.get_mutable(table_box());
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auto& computed_values = table_box().computed_values();
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// Percentages on 'width' and 'height' on the table are relative to the table wrapper box's containing block,
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// not the table wrapper box itself.
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CSSPixels width_of_table_containing_block = m_state.get(*table_wrapper().containing_block()).content_width();
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// The row/column-grid width minimum (GRIDMIN) width is the sum of the min-content width
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// of all the columns plus cell spacing or borders.
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CSSPixels grid_min = 0.0f;
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for (auto& column : m_columns) {
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grid_min += column.min_width;
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}
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// The row/column-grid width maximum (GRIDMAX) width is the sum of the max-content width
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// of all the columns plus cell spacing or borders.
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CSSPixels grid_max = 0.0f;
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for (auto& column : m_columns) {
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grid_max += column.max_width;
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}
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// The used min-width of a table is the greater of the resolved min-width, CAPMIN, and GRIDMIN.
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auto used_min_width = grid_min;
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if (!computed_values.min_width().is_auto()) {
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used_min_width = max(used_min_width, computed_values.min_width().resolved(table_box(), CSS::Length::make_px(width_of_table_containing_block)).to_px(table_box()));
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}
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CSSPixels used_width;
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if (computed_values.width().is_auto()) {
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// If the table-root has 'width: auto', the used width is the greater of
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// min(GRIDMAX, the table’s containing block width), the used min-width of the table.
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used_width = max(min(grid_max, width_of_table_containing_block), used_min_width);
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table_box_state.set_content_width(used_width);
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} else {
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// If the table-root’s width property has a computed value (resolving to
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// resolved-table-width) other than auto, the used width is the greater
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// of resolved-table-width, and the used min-width of the table.
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CSSPixels resolved_table_width = computed_values.width().resolved(table_box(), CSS::Length::make_px(width_of_table_containing_block)).to_px(table_box());
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used_width = max(resolved_table_width, used_min_width);
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if (!computed_values.max_width().is_none())
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used_width = min(used_width, computed_values.max_width().resolved(table_box(), CSS::Length::make_px(width_of_table_containing_block)).to_px(table_box()));
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table_box_state.set_content_width(used_width);
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}
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}
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void TableFormattingContext::distribute_width_to_columns()
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{
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// Implements https://www.w3.org/TR/css-tables-3/#width-distribution-algorithm
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CSSPixels available_width = m_state.get(table_box()).content_width();
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auto columns_total_used_width = [&]() {
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CSSPixels total_used_width = 0;
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for (auto& column : m_columns) {
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total_used_width += column.used_width;
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}
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return total_used_width;
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};
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auto column_preferred_width = [&](Column& column) {
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switch (column.type) {
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case ColumnType::Percent: {
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return max(column.min_width, column.percentage_width / 100 * available_width);
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}
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case ColumnType::Pixel:
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case ColumnType::Auto: {
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return column.max_width;
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}
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default: {
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VERIFY_NOT_REACHED();
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}
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}
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};
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auto expand_columns_to_fill_available_width = [&](ColumnType column_type) {
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CSSPixels remaining_available_width = available_width;
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CSSPixels total_preferred_width_increment = 0;
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for (auto& column : m_columns) {
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remaining_available_width -= column.used_width;
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if (column.type == column_type) {
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total_preferred_width_increment += column_preferred_width(column) - column.min_width;
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}
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}
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if (total_preferred_width_increment == 0)
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return;
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for (auto& column : m_columns) {
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if (column.type == column_type) {
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CSSPixels preferred_width_increment = column_preferred_width(column) - column.min_width;
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column.used_width += preferred_width_increment * remaining_available_width / total_preferred_width_increment;
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}
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}
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};
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auto shrink_columns_to_fit_available_width = [&](ColumnType column_type) {
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for (auto& column : m_columns) {
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if (column.type == column_type)
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column.used_width = column.min_width;
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}
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expand_columns_to_fill_available_width(column_type);
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};
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for (auto& column : m_columns) {
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column.used_width = column.min_width;
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}
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for (auto& column : m_columns) {
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if (column.type == ColumnType::Percent) {
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column.used_width = max(column.min_width, column.percentage_width / 100 * available_width);
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}
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}
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if (columns_total_used_width() > available_width) {
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shrink_columns_to_fit_available_width(ColumnType::Percent);
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return;
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}
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for (auto& column : m_columns) {
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if (column.type == ColumnType::Pixel) {
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column.used_width = column.max_width;
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}
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}
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if (columns_total_used_width() > available_width) {
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shrink_columns_to_fit_available_width(ColumnType::Pixel);
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return;
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}
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if (columns_total_used_width() < available_width) {
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expand_columns_to_fill_available_width(ColumnType::Auto);
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}
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if (columns_total_used_width() < available_width) {
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expand_columns_to_fill_available_width(ColumnType::Pixel);
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}
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if (columns_total_used_width() < available_width) {
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expand_columns_to_fill_available_width(ColumnType::Percent);
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}
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if (columns_total_used_width() < available_width) {
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// NOTE: if all columns got their max width and there is still width to distribute left
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// it should be assigned to columns proportionally to their max width
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CSSPixels grid_max = 0.0f;
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for (auto& column : m_columns) {
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grid_max += column.max_width;
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}
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auto width_to_distribute = available_width - columns_total_used_width();
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for (auto& column : m_columns) {
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column.used_width += width_to_distribute * column.max_width / grid_max;
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}
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}
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}
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void TableFormattingContext::determine_intrisic_size_of_table_container(AvailableSpace const& available_space)
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{
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auto& table_box_state = m_state.get_mutable(table_box());
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if (available_space.width.is_min_content()) {
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// The min-content width of a table is the width required to fit all of its columns min-content widths and its undistributable spaces.
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CSSPixels grid_min = 0.0f;
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for (auto& column : m_columns)
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grid_min += column.min_width;
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table_box_state.set_content_width(grid_min);
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}
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if (available_space.width.is_max_content()) {
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// The max-content width of a table is the width required to fit all of its columns max-content widths and its undistributable spaces.
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CSSPixels grid_max = 0.0f;
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for (auto& column : m_columns)
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grid_max += column.max_width;
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table_box_state.set_content_width(grid_max);
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}
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}
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void TableFormattingContext::calculate_row_heights(LayoutMode layout_mode)
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{
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for (auto& cell : m_cells) {
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auto& row = m_rows[cell.row_index];
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auto& cell_state = m_state.get_mutable(cell.box);
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CSSPixels span_width = 0;
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for (size_t i = 0; i < cell.column_span; ++i)
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span_width += m_columns[cell.column_index + i].used_width;
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auto width_of_containing_block = m_state.get(*cell.box->containing_block()).content_width();
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auto width_of_containing_block_as_length = CSS::Length::make_px(width_of_containing_block);
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auto height_of_containing_block = m_state.get(*cell.box->containing_block()).content_height();
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auto height_of_containing_block_as_length = CSS::Length::make_px(height_of_containing_block);
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cell_state.padding_top = cell.box->computed_values().padding().top().resolved(cell.box, width_of_containing_block_as_length).to_px(cell.box);
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cell_state.padding_bottom = cell.box->computed_values().padding().bottom().resolved(cell.box, width_of_containing_block_as_length).to_px(cell.box);
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cell_state.padding_left = cell.box->computed_values().padding().left().resolved(cell.box, width_of_containing_block_as_length).to_px(cell.box);
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cell_state.padding_right = cell.box->computed_values().padding().right().resolved(cell.box, width_of_containing_block_as_length).to_px(cell.box);
|
||
|
||
auto is_top_most_cell = cell.row_index == 0;
|
||
auto is_left_most_cell = cell.column_index == 0;
|
||
auto is_right_most_cell = cell.column_index == m_columns.size() - 1;
|
||
auto is_bottom_most_cell = cell.row_index == m_rows.size() - 1;
|
||
auto should_hide_borders = cell.box->computed_values().border_collapse() == CSS::BorderCollapse::Collapse;
|
||
|
||
cell_state.border_top = (should_hide_borders && is_top_most_cell) ? 0 : cell.box->computed_values().border_top().width;
|
||
cell_state.border_bottom = (should_hide_borders && is_bottom_most_cell) ? 0 : cell.box->computed_values().border_bottom().width;
|
||
cell_state.border_left = (should_hide_borders && is_left_most_cell) ? 0 : cell.box->computed_values().border_left().width;
|
||
cell_state.border_right = (should_hide_borders && is_right_most_cell) ? 0 : cell.box->computed_values().border_right().width;
|
||
|
||
auto cell_computed_height = cell.box->computed_values().height();
|
||
if (cell_computed_height.is_length()) {
|
||
auto cell_used_height = cell_computed_height.resolved(cell.box, height_of_containing_block_as_length).to_px(cell.box);
|
||
cell_state.set_content_height(cell_used_height - cell_state.border_box_top() - cell_state.border_box_bottom());
|
||
|
||
row.used_height = max(row.used_height, cell_used_height);
|
||
}
|
||
|
||
cell_state.set_content_width((span_width - cell_state.border_box_left() - cell_state.border_box_right()));
|
||
if (auto independent_formatting_context = layout_inside(cell.box, layout_mode, cell_state.available_inner_space_or_constraints_from(*m_available_space))) {
|
||
cell_state.set_content_height(independent_formatting_context->automatic_content_height());
|
||
independent_formatting_context->parent_context_did_dimension_child_root_box();
|
||
}
|
||
|
||
cell.baseline = box_baseline(m_state, cell.box);
|
||
|
||
row.used_height = max(row.used_height, cell_state.border_box_height());
|
||
row.baseline = max(row.baseline, cell.baseline);
|
||
}
|
||
|
||
for (auto& row : m_rows) {
|
||
auto row_computed_height = row.box->computed_values().height();
|
||
if (row_computed_height.is_length()) {
|
||
auto height_of_containing_block = m_state.get(*row.box->containing_block()).content_height();
|
||
auto height_of_containing_block_as_length = CSS::Length::make_px(height_of_containing_block);
|
||
auto row_used_height = row_computed_height.resolved(row.box, height_of_containing_block_as_length).to_px(row.box);
|
||
row.used_height = max(row.used_height, row_used_height);
|
||
}
|
||
}
|
||
}
|
||
|
||
void TableFormattingContext::position_row_boxes(CSSPixels& total_content_height)
|
||
{
|
||
auto const& table_state = m_state.get(table_box());
|
||
|
||
CSSPixels row_top_offset = table_state.border_top + table_state.padding_top;
|
||
CSSPixels row_left_offset = table_state.border_left + table_state.padding_left;
|
||
for (size_t y = 0; y < m_rows.size(); y++) {
|
||
auto& row = m_rows[y];
|
||
auto& row_state = m_state.get_mutable(row.box);
|
||
CSSPixels row_width = 0.0f;
|
||
for (auto& column : m_columns) {
|
||
row_width += column.used_width;
|
||
}
|
||
|
||
row_state.set_content_height(row.used_height);
|
||
row_state.set_content_width(row_width);
|
||
row_state.set_content_x(row_left_offset);
|
||
row_state.set_content_y(row_top_offset);
|
||
row_top_offset += row_state.content_height();
|
||
}
|
||
|
||
CSSPixels row_group_top_offset = table_state.border_top + table_state.padding_top;
|
||
CSSPixels row_group_left_offset = table_state.border_left + table_state.padding_left;
|
||
table_box().for_each_child_of_type<TableRowGroupBox>([&](auto& row_group_box) {
|
||
CSSPixels row_group_height = 0.0f;
|
||
CSSPixels row_group_width = 0.0f;
|
||
|
||
auto& row_group_box_state = m_state.get_mutable(row_group_box);
|
||
row_group_box_state.set_content_x(row_group_left_offset);
|
||
row_group_box_state.set_content_y(row_group_top_offset);
|
||
|
||
row_group_box.template for_each_child_of_type<TableRowBox>([&](auto& row) {
|
||
auto const& row_state = m_state.get(row);
|
||
row_group_height += row_state.border_box_height();
|
||
row_group_width = max(row_group_width, row_state.border_box_width());
|
||
});
|
||
|
||
row_group_box_state.set_content_height(row_group_height);
|
||
row_group_box_state.set_content_width(row_group_width);
|
||
|
||
row_group_top_offset += row_group_height;
|
||
});
|
||
|
||
total_content_height = max(row_top_offset, row_group_top_offset) - table_state.border_top - table_state.padding_top;
|
||
}
|
||
|
||
void TableFormattingContext::position_cell_boxes()
|
||
{
|
||
CSSPixels left_column_offset = 0;
|
||
for (auto& column : m_columns) {
|
||
column.left_offset = left_column_offset;
|
||
left_column_offset += column.used_width;
|
||
}
|
||
|
||
for (auto& cell : m_cells) {
|
||
auto& cell_state = m_state.get_mutable(cell.box);
|
||
auto& row_state = m_state.get(m_rows[cell.row_index].box);
|
||
CSSPixels const cell_border_box_height = cell_state.content_height() + cell_state.border_box_top() + cell_state.border_box_bottom();
|
||
CSSPixels const row_content_height = row_state.content_height();
|
||
auto const& vertical_align = cell.box->computed_values().vertical_align();
|
||
if (vertical_align.has<CSS::VerticalAlign>()) {
|
||
switch (vertical_align.get<CSS::VerticalAlign>()) {
|
||
case CSS::VerticalAlign::Middle: {
|
||
cell_state.padding_top += (row_content_height - cell_border_box_height) / 2;
|
||
cell_state.padding_bottom += (row_content_height - cell_border_box_height) / 2;
|
||
break;
|
||
}
|
||
// FIXME: implement actual 'top' and 'bottom' support instead of fall back to 'baseline'
|
||
case CSS::VerticalAlign::Top:
|
||
case CSS::VerticalAlign::Bottom:
|
||
case CSS::VerticalAlign::Baseline: {
|
||
cell_state.padding_top += m_rows[cell.row_index].baseline - cell.baseline;
|
||
cell_state.padding_bottom += row_content_height - cell_border_box_height;
|
||
break;
|
||
}
|
||
default:
|
||
VERIFY_NOT_REACHED();
|
||
}
|
||
}
|
||
|
||
cell_state.offset = row_state.offset.translated(cell_state.border_box_left() + m_columns[cell.column_index].left_offset, cell_state.border_box_top());
|
||
}
|
||
}
|
||
|
||
void TableFormattingContext::run(Box const& box, LayoutMode layout_mode, AvailableSpace const& available_space)
|
||
{
|
||
m_available_space = available_space;
|
||
|
||
CSSPixels total_content_height = 0;
|
||
|
||
// Determine the number of rows/columns the table requires.
|
||
calculate_row_column_grid(box);
|
||
|
||
// Compute the minimum width of each column.
|
||
compute_table_measures();
|
||
|
||
if (available_space.width.is_intrinsic_sizing_constraint() && !available_space.height.is_intrinsic_sizing_constraint()) {
|
||
determine_intrisic_size_of_table_container(available_space);
|
||
return;
|
||
}
|
||
|
||
// Compute the width of the table.
|
||
compute_table_width();
|
||
|
||
// Distribute the width of the table among columns.
|
||
distribute_width_to_columns();
|
||
|
||
calculate_row_heights(layout_mode);
|
||
position_row_boxes(total_content_height);
|
||
position_cell_boxes();
|
||
|
||
m_state.get_mutable(table_box()).set_content_height(total_content_height);
|
||
|
||
// FIXME: This is a total hack, we should respect the 'height' property.
|
||
m_automatic_content_height = total_content_height;
|
||
}
|
||
|
||
CSSPixels TableFormattingContext::automatic_content_width() const
|
||
{
|
||
return greatest_child_width(context_box());
|
||
}
|
||
|
||
CSSPixels TableFormattingContext::automatic_content_height() const
|
||
{
|
||
return m_automatic_content_height;
|
||
}
|
||
|
||
}
|