372 lines
16 KiB
C++
372 lines
16 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, BlockContainer 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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for (auto& cell : m_cells) {
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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& 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 cell_outer_min_content_width = min_width + cell_intrinsic_offsets;
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auto cell_outer_max_content_width = max(max(width, min_width), max_width) + cell_intrinsic_offsets;
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m_columns[cell.column_index].min_width = max(m_columns[cell.column_index].min_width, cell_outer_min_content_width);
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m_columns[cell.column_index].max_width = max(m_columns[cell.column_index].max_width, cell_outer_max_content_width);
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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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}
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void TableFormattingContext::compute_table_width(CSSPixels& extra_width)
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{
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auto const& table_box = context_box();
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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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CSSPixels width_of_table_containing_block = m_state.get(*table_box.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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table_box_state.set_content_width(used_width);
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}
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if (used_width > grid_min) {
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extra_width = used_width - grid_min;
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}
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}
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void TableFormattingContext::distribute_width_to_columns(CSSPixels extra_width)
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{
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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 - column.min_width;
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if (grid_max == 0)
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return;
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for (auto& column : m_columns)
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column.used_width += ((column.max_width - column.min_width) / grid_max) * extra_width;
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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 const& table_box = context_box();
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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::run(Box const& box, LayoutMode, AvailableSpace const& available_space)
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{
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CSSPixels total_content_height = 0;
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// Determine the number of rows/columns the table requires.
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calculate_row_column_grid(box);
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// Compute the minimum width of each column.
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compute_table_measures();
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if (available_space.width.is_intrinsic_sizing_constraint()) {
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determine_intrisic_size_of_table_container(available_space);
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return;
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}
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// Compute the width of the table.
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CSSPixels extra_width = 0;
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compute_table_width(extra_width);
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// Distribute the width of the table among columns.
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distribute_width_to_columns(extra_width);
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CSSPixels left_column_offset = 0;
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for (auto& column : m_columns) {
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column.left_offset = left_column_offset;
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left_column_offset += column.used_width;
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}
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for (auto& cell : m_cells) {
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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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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);
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auto is_top_most_cell = cell.row_index == 0;
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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 is_bottom_most_cell = cell.row_index == m_rows.size() - 1;
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auto should_hide_borders = cell.box.computed_values().border_collapse() == CSS::BorderCollapse::Collapse;
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cell_state.border_top = (should_hide_borders && is_top_most_cell) ? 0 : cell.box.computed_values().border_top().width;
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cell_state.border_bottom = (should_hide_borders && is_bottom_most_cell) ? 0 : cell.box.computed_values().border_bottom().width;
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cell_state.border_left = (should_hide_borders && is_left_most_cell) ? 0 : cell.box.computed_values().border_left().width;
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cell_state.border_right = (should_hide_borders && is_right_most_cell) ? 0 : cell.box.computed_values().border_right().width;
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cell_state.set_content_width((span_width - cell_state.border_box_left() - cell_state.border_box_right()));
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auto independent_formatting_context = layout_inside(cell.box, LayoutMode::Normal, cell_state.available_inner_space_or_constraints_from(available_space));
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VERIFY(independent_formatting_context);
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cell_state.set_content_height(independent_formatting_context->automatic_content_height());
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independent_formatting_context->parent_context_did_dimension_child_root_box();
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cell.baseline = box_baseline(m_state, cell.box);
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auto& row = m_rows[cell.row_index];
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row.used_width = max(row.used_width, cell_state.border_box_height());
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row.baseline = max(row.baseline, cell.baseline);
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}
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CSSPixels row_top_offset = 0.0f;
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for (size_t y = 0; y < m_rows.size(); y++) {
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auto& row = m_rows[y];
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auto& row_state = m_state.get_mutable(row.box);
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CSSPixels row_width = 0.0f;
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for (auto& column : m_columns) {
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row_width += column.used_width;
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}
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row_state.set_content_height(row.used_width);
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row_state.set_content_width(row_width);
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row_state.set_content_y(row_top_offset);
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row_top_offset += row_state.content_height();
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}
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CSSPixels row_group_top_offset = 0.0f;
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box.for_each_child_of_type<TableRowGroupBox>([&](auto& row_group_box) {
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CSSPixels row_group_height = 0.0f;
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CSSPixels row_group_width = 0.0f;
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auto& row_group_box_state = m_state.get_mutable(row_group_box);
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row_group_box_state.set_content_y(row_group_top_offset);
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CSSPixels row_top_offset = 0.0f;
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row_group_box.template for_each_child_of_type<TableRowBox>([&](auto& row) {
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auto& row_state = m_state.get_mutable(row);
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row_state.set_content_y(row_top_offset);
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row_group_height += row_state.border_box_height();
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row_group_width = max(row_group_width, row_state.border_box_width());
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row_top_offset += row_state.border_box_height();
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});
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row_group_top_offset += row_top_offset;
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row_group_box_state.set_content_height(row_group_height);
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row_group_box_state.set_content_width(row_group_width);
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});
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for (auto& cell : m_cells) {
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auto& cell_state = m_state.get_mutable(cell.box);
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auto& row_state = m_state.get(m_rows[cell.row_index].box);
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CSSPixels const cell_border_box_height = cell_state.content_height() + cell_state.border_box_top() + cell_state.border_box_bottom();
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CSSPixels const row_content_height = row_state.content_height();
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auto const& vertical_align = cell.box.computed_values().vertical_align();
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if (vertical_align.has<CSS::VerticalAlign>()) {
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switch (vertical_align.get<CSS::VerticalAlign>()) {
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case CSS::VerticalAlign::Middle: {
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cell_state.padding_top += (row_content_height - cell_border_box_height) / 2;
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cell_state.padding_bottom += (row_content_height - cell_border_box_height) / 2;
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break;
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}
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// FIXME: implement actual 'top' and 'bottom' support instead of fall back to 'baseline'
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case CSS::VerticalAlign::Top:
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case CSS::VerticalAlign::Bottom:
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case CSS::VerticalAlign::Baseline: {
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cell_state.padding_top += m_rows[cell.row_index].baseline - cell.baseline;
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cell_state.padding_bottom += row_content_height - cell_border_box_height;
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break;
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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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cell_state.offset = row_state.offset.translated(cell_state.border_box_left() + m_columns[cell.column_index].left_offset, cell_state.border_box_top());
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}
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m_state.get_mutable(context_box()).set_content_height(total_content_height);
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// FIXME: This is a total hack, we should respect the 'height' property.
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m_automatic_content_height = total_content_height;
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}
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CSSPixels TableFormattingContext::automatic_content_height() const
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{
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return m_automatic_content_height;
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}
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}
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