2053 lines
103 KiB
C++
2053 lines
103 KiB
C++
/*
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* Copyright (c) 2022-2023, Martin Falisse <mfalisse@outlook.com>
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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/Layout/Box.h>
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#include <LibWeb/Layout/GridFormattingContext.h>
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namespace Web::Layout {
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GridFormattingContext::GridTrack GridFormattingContext::GridTrack::create_from_definition(CSS::ExplicitGridTrack const& definition)
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{
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// NOTE: repeat() is expected to be expanded beforehand.
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VERIFY(!definition.is_repeat());
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if (definition.is_minmax()) {
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return GridTrack {
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.min_track_sizing_function = definition.minmax().min_grid_size(),
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.max_track_sizing_function = definition.minmax().max_grid_size(),
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};
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}
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return GridTrack {
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.min_track_sizing_function = definition.grid_size(),
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.max_track_sizing_function = definition.grid_size(),
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};
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}
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GridFormattingContext::GridTrack GridFormattingContext::GridTrack::create_auto()
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{
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return GridTrack {
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.min_track_sizing_function = CSS::GridSize::make_auto(),
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.max_track_sizing_function = CSS::GridSize::make_auto(),
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};
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}
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GridFormattingContext::GridTrack GridFormattingContext::GridTrack::create_gap(CSSPixels size)
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{
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return GridTrack {
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.min_track_sizing_function = CSS::GridSize(CSS::Length::make_px(size)),
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.max_track_sizing_function = CSS::GridSize(CSS::Length::make_px(size)),
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.base_size = size,
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.is_gap = true,
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};
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}
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GridFormattingContext::GridFormattingContext(LayoutState& state, Box const& grid_container, FormattingContext* parent)
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: FormattingContext(Type::Grid, state, grid_container, parent)
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{
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}
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GridFormattingContext::~GridFormattingContext() = default;
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CSSPixels GridFormattingContext::resolve_definite_track_size(CSS::GridSize const& grid_size, AvailableSpace const& available_space)
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{
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VERIFY(grid_size.is_definite());
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switch (grid_size.type()) {
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case CSS::GridSize::Type::LengthPercentage: {
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if (!grid_size.length_percentage().is_auto()) {
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return grid_size.css_size().to_px(grid_container(), available_space.width.to_px());
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}
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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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return 0;
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}
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int GridFormattingContext::get_count_of_tracks(Vector<CSS::ExplicitGridTrack> const& track_list, AvailableSpace const& available_space)
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{
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auto track_count = 0;
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for (auto const& explicit_grid_track : track_list) {
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if (explicit_grid_track.is_repeat() && explicit_grid_track.repeat().is_default())
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track_count += explicit_grid_track.repeat().repeat_count() * explicit_grid_track.repeat().grid_track_size_list().track_list().size();
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else
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track_count += 1;
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}
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if (track_list.size() == 1
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&& track_list.first().is_repeat()
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&& (track_list.first().repeat().is_auto_fill() || track_list.first().repeat().is_auto_fit())) {
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track_count = count_of_repeated_auto_fill_or_fit_tracks(track_list, available_space);
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}
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return track_count;
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}
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int GridFormattingContext::count_of_repeated_auto_fill_or_fit_tracks(Vector<CSS::ExplicitGridTrack> const& track_list, AvailableSpace const& available_space)
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{
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// https://www.w3.org/TR/css-grid-2/#auto-repeat
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// 7.2.3.2. Repeat-to-fill: auto-fill and auto-fit repetitions
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// On a subgridded axis, the auto-fill keyword is only valid once per <line-name-list>, and repeats
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// enough times for the name list to match the subgrid’s specified grid span (falling back to 0 if
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// the span is already fulfilled).
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// Otherwise on a standalone axis, when auto-fill is given as the repetition number
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// If the grid container has a definite size or max size in the relevant axis, then the number of
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// repetitions is the largest possible positive integer that does not cause the grid to overflow the
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// content box of its grid container
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CSSPixels sum_of_grid_track_sizes = 0;
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// (treating each track as its max track sizing function if that is definite or its minimum track sizing
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// function otherwise, flooring the max track sizing function by the min track sizing function if both
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// are definite, and taking gap into account)
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// FIXME: take gap into account
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for (auto& explicit_grid_track : track_list.first().repeat().grid_track_size_list().track_list()) {
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auto track_sizing_function = explicit_grid_track;
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if (track_sizing_function.is_minmax()) {
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if (track_sizing_function.minmax().max_grid_size().is_definite() && !track_sizing_function.minmax().min_grid_size().is_definite())
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sum_of_grid_track_sizes += resolve_definite_track_size(track_sizing_function.minmax().max_grid_size(), available_space);
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else if (track_sizing_function.minmax().min_grid_size().is_definite() && !track_sizing_function.minmax().max_grid_size().is_definite())
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sum_of_grid_track_sizes += resolve_definite_track_size(track_sizing_function.minmax().min_grid_size(), available_space);
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else if (track_sizing_function.minmax().min_grid_size().is_definite() && track_sizing_function.minmax().max_grid_size().is_definite())
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sum_of_grid_track_sizes += min(resolve_definite_track_size(track_sizing_function.minmax().min_grid_size(), available_space), resolve_definite_track_size(track_sizing_function.minmax().max_grid_size(), available_space));
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} else {
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sum_of_grid_track_sizes += min(resolve_definite_track_size(track_sizing_function.grid_size(), available_space), resolve_definite_track_size(track_sizing_function.grid_size(), available_space));
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}
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}
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return max(1, static_cast<int>((get_free_space(available_space, GridDimension::Column).to_px() / sum_of_grid_track_sizes).to_double()));
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// For the purpose of finding the number of auto-repeated tracks in a standalone axis, the UA must
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// floor the track size to a UA-specified value to avoid division by zero. It is suggested that this
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// floor be 1px.
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}
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void GridFormattingContext::place_item_with_row_and_column_position(Box const& child_box)
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{
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int row_start = child_box.computed_values().grid_row_start().raw_value() - 1;
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int row_end = child_box.computed_values().grid_row_end().raw_value() - 1;
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int column_start = child_box.computed_values().grid_column_start().raw_value() - 1;
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int column_end = child_box.computed_values().grid_column_end().raw_value() - 1;
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// https://www.w3.org/TR/css-grid-2/#line-placement
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// 8.3. Line-based Placement: the grid-row-start, grid-column-start, grid-row-end, and grid-column-end properties
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// https://www.w3.org/TR/css-grid-2/#grid-placement-slot
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// First attempt to match the grid area’s edge to a named grid area: if there is a grid line whose
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// line name is <custom-ident>-start (for grid-*-start) / <custom-ident>-end (for grid-*-end),
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// contributes the first such line to the grid item’s placement.
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// Otherwise, treat this as if the integer 1 had been specified along with the <custom-ident>.
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// https://www.w3.org/TR/css-grid-2/#grid-placement-int
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// Contributes the Nth grid line to the grid item’s placement. If a negative integer is given, it
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// instead counts in reverse, starting from the end edge of the explicit grid.
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if (row_end < 0)
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row_end = m_occupation_grid.row_count() + row_end + 2;
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if (column_end < 0)
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column_end = m_occupation_grid.column_count() + column_end + 2;
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// If a name is given as a <custom-ident>, only lines with that name are counted. If not enough
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// lines with that name exist, all implicit grid lines are assumed to have that name for the purpose
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// of finding this position.
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// https://www.w3.org/TR/css-grid-2/#grid-placement-span-int
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// Contributes a grid span to the grid item’s placement such that the corresponding edge of the grid
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// item’s grid area is N lines from its opposite edge in the corresponding direction. For example,
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// grid-column-end: span 2 indicates the second grid line in the endward direction from the
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// grid-column-start line.
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size_t row_span = 1;
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size_t column_span = 1;
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if (child_box.computed_values().grid_row_start().is_position() && child_box.computed_values().grid_row_end().is_span())
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row_span = child_box.computed_values().grid_row_end().raw_value();
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if (child_box.computed_values().grid_column_start().is_position() && child_box.computed_values().grid_column_end().is_span())
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column_span = child_box.computed_values().grid_column_end().raw_value();
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if (child_box.computed_values().grid_row_end().is_position() && child_box.computed_values().grid_row_start().is_span()) {
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row_span = child_box.computed_values().grid_row_start().raw_value();
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row_start = row_end - row_span;
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}
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if (child_box.computed_values().grid_column_end().is_position() && child_box.computed_values().grid_column_start().is_span()) {
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column_span = child_box.computed_values().grid_column_start().raw_value();
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column_start = column_end - column_span;
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}
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// If a name is given as a <custom-ident>, only lines with that name are counted. If not enough
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// lines with that name exist, all implicit grid lines on the side of the explicit grid
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// corresponding to the search direction are assumed to have that name for the purpose of counting
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// this span.
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// https://drafts.csswg.org/css-grid/#grid-placement-auto
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// auto
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// The property contributes nothing to the grid item’s placement, indicating auto-placement or a
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// default span of one. (See § 8 Placing Grid Items, above.)
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// https://www.w3.org/TR/css-grid-2/#common-uses-named-lines
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// 8.1.3. Named Lines and Spans
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// Instead of counting lines by number, lines can be referenced by their line name:
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if (child_box.computed_values().grid_column_end().has_line_name()) {
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if (auto maybe_grid_area = m_grid_areas.get(child_box.computed_values().grid_column_end().line_name()); maybe_grid_area.has_value())
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column_end = maybe_grid_area->column_end;
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else if (auto line_name_index = get_line_index_by_line_name(child_box.computed_values().grid_column_end().line_name(), grid_container().computed_values().grid_template_columns()); line_name_index > -1)
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column_end = line_name_index;
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else
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column_end = 1;
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column_start = column_end - 1;
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}
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if (child_box.computed_values().grid_column_start().has_line_name()) {
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if (auto maybe_grid_area = m_grid_areas.get(child_box.computed_values().grid_column_end().line_name()); maybe_grid_area.has_value())
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column_start = maybe_grid_area->column_start;
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else if (auto line_name_index = get_line_index_by_line_name(child_box.computed_values().grid_column_start().line_name(), grid_container().computed_values().grid_template_columns()); line_name_index > -1)
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column_start = line_name_index;
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else
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column_start = 0;
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}
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if (child_box.computed_values().grid_row_end().has_line_name()) {
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if (auto maybe_grid_area = m_grid_areas.get(child_box.computed_values().grid_row_end().line_name()); maybe_grid_area.has_value())
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row_end = maybe_grid_area->row_end;
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else if (auto line_name_index = get_line_index_by_line_name(child_box.computed_values().grid_row_end().line_name(), grid_container().computed_values().grid_template_rows()); line_name_index > -1)
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row_end = line_name_index;
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else
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row_end = 1;
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row_start = row_end - 1;
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}
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if (child_box.computed_values().grid_row_start().has_line_name()) {
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if (auto maybe_grid_area = m_grid_areas.get(child_box.computed_values().grid_row_end().line_name()); maybe_grid_area.has_value())
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row_start = maybe_grid_area->row_start;
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else if (auto line_name_index = get_line_index_by_line_name(child_box.computed_values().grid_row_start().line_name(), grid_container().computed_values().grid_template_rows()); line_name_index > -1)
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row_start = line_name_index;
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else
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row_start = 0;
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}
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// If there are multiple lines of the same name, they effectively establish a named set of grid
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// lines, which can be exclusively indexed by filtering the placement by name:
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// https://drafts.csswg.org/css-grid/#grid-placement-errors
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// 8.3.1. Grid Placement Conflict Handling
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// If the placement for a grid item contains two lines, and the start line is further end-ward than
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// the end line, swap the two lines. If the start line is equal to the end line, remove the end
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// line.
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if (child_box.computed_values().grid_row_start().is_position() && child_box.computed_values().grid_row_end().is_position()) {
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if (row_start > row_end)
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swap(row_start, row_end);
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if (row_start != row_end)
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row_span = row_end - row_start;
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}
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if (child_box.computed_values().grid_column_start().is_position() && child_box.computed_values().grid_column_end().is_position()) {
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if (column_start > column_end)
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swap(column_start, column_end);
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if (column_start != column_end)
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column_span = column_end - column_start;
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}
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// If the placement contains two spans, remove the one contributed by the end grid-placement
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// property.
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if (child_box.computed_values().grid_row_start().is_span() && child_box.computed_values().grid_row_end().is_span())
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row_span = child_box.computed_values().grid_row_start().raw_value();
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if (child_box.computed_values().grid_column_start().is_span() && child_box.computed_values().grid_column_end().is_span())
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column_span = child_box.computed_values().grid_column_start().raw_value();
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// FIXME: If the placement contains only a span for a named line, replace it with a span of 1.
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m_grid_items.append(GridItem {
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.box = child_box,
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.row = row_start,
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.row_span = row_span,
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.column = column_start,
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.column_span = column_span });
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m_occupation_grid.set_occupied(column_start, column_start + column_span, row_start, row_start + row_span);
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}
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void GridFormattingContext::place_item_with_row_position(Box const& child_box)
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{
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int row_start = child_box.computed_values().grid_row_start().raw_value() - 1;
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int row_end = child_box.computed_values().grid_row_end().raw_value() - 1;
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// https://www.w3.org/TR/css-grid-2/#line-placement
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// 8.3. Line-based Placement: the grid-row-start, grid-column-start, grid-row-end, and grid-column-end properties
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// https://www.w3.org/TR/css-grid-2/#grid-placement-slot
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// First attempt to match the grid area’s edge to a named grid area: if there is a grid line whose
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// line name is <custom-ident>-start (for grid-*-start) / <custom-ident>-end (for grid-*-end),
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// contributes the first such line to the grid item’s placement.
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// Otherwise, treat this as if the integer 1 had been specified along with the <custom-ident>.
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// https://www.w3.org/TR/css-grid-2/#grid-placement-int
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// Contributes the Nth grid line to the grid item’s placement. If a negative integer is given, it
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// instead counts in reverse, starting from the end edge of the explicit grid.
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if (row_end < 0)
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row_end = m_occupation_grid.row_count() + row_end + 2;
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// If a name is given as a <custom-ident>, only lines with that name are counted. If not enough
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// lines with that name exist, all implicit grid lines are assumed to have that name for the purpose
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// of finding this position.
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// https://www.w3.org/TR/css-grid-2/#grid-placement-span-int
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// Contributes a grid span to the grid item’s placement such that the corresponding edge of the grid
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// item’s grid area is N lines from its opposite edge in the corresponding direction. For example,
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// grid-column-end: span 2 indicates the second grid line in the endward direction from the
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// grid-column-start line.
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size_t row_span = 1;
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if (child_box.computed_values().grid_row_start().is_position() && child_box.computed_values().grid_row_end().is_span())
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row_span = child_box.computed_values().grid_row_end().raw_value();
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if (child_box.computed_values().grid_row_end().is_position() && child_box.computed_values().grid_row_start().is_span()) {
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row_span = child_box.computed_values().grid_row_start().raw_value();
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row_start = row_end - row_span;
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// FIXME: Remove me once have implemented spans overflowing into negative indexes, e.g., grid-row: span 2 / 1
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if (row_start < 0)
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row_start = 0;
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}
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// If a name is given as a <custom-ident>, only lines with that name are counted. If not enough
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// lines with that name exist, all implicit grid lines on the side of the explicit grid
|
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// corresponding to the search direction are assumed to have that name for the purpose of counting
|
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// this span.
|
||
|
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// https://drafts.csswg.org/css-grid/#grid-placement-auto
|
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// auto
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// The property contributes nothing to the grid item’s placement, indicating auto-placement or a
|
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// default span of one. (See § 8 Placing Grid Items, above.)
|
||
|
||
// https://www.w3.org/TR/css-grid-2/#common-uses-named-lines
|
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// 8.1.3. Named Lines and Spans
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// Instead of counting lines by number, lines can be referenced by their line name:
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if (child_box.computed_values().grid_row_end().has_line_name()) {
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if (auto maybe_grid_area = m_grid_areas.get(child_box.computed_values().grid_row_end().line_name()); maybe_grid_area.has_value())
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row_end = maybe_grid_area->row_end;
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else if (auto line_name_index = get_line_index_by_line_name(child_box.computed_values().grid_row_end().line_name(), grid_container().computed_values().grid_template_rows()); line_name_index > -1)
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row_end = line_name_index;
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else
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row_end = 1;
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row_start = row_end - 1;
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}
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if (child_box.computed_values().grid_row_start().has_line_name()) {
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if (auto maybe_grid_area = m_grid_areas.get(child_box.computed_values().grid_row_end().line_name()); maybe_grid_area.has_value())
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row_start = maybe_grid_area->row_start;
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else if (auto line_name_index = get_line_index_by_line_name(child_box.computed_values().grid_row_start().line_name(), grid_container().computed_values().grid_template_rows()); line_name_index > -1)
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row_start = line_name_index;
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else
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row_start = 0;
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}
|
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|
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// If there are multiple lines of the same name, they effectively establish a named set of grid
|
||
// lines, which can be exclusively indexed by filtering the placement by name:
|
||
|
||
// https://drafts.csswg.org/css-grid/#grid-placement-errors
|
||
// 8.3.1. Grid Placement Conflict Handling
|
||
// If the placement for a grid item contains two lines, and the start line is further end-ward than
|
||
// the end line, swap the two lines. If the start line is equal to the end line, remove the end
|
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// line.
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if (child_box.computed_values().grid_row_start().is_position() && child_box.computed_values().grid_row_end().is_position()) {
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if (row_start > row_end)
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swap(row_start, row_end);
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if (row_start != row_end)
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row_span = row_end - row_start;
|
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}
|
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// FIXME: Have yet to find the spec for this.
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if (!child_box.computed_values().grid_row_start().is_position() && child_box.computed_values().grid_row_end().is_position() && row_end == 0)
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row_start = 0;
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// If the placement contains two spans, remove the one contributed by the end grid-placement
|
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// property.
|
||
if (child_box.computed_values().grid_row_start().is_span() && child_box.computed_values().grid_row_end().is_span())
|
||
row_span = child_box.computed_values().grid_row_start().raw_value();
|
||
|
||
// FIXME: If the placement contains only a span for a named line, replace it with a span of 1.
|
||
|
||
int column_start = 0;
|
||
size_t column_span = child_box.computed_values().grid_column_start().is_span() ? child_box.computed_values().grid_column_start().raw_value() : 1;
|
||
bool found_available_column = false;
|
||
for (size_t column_index = column_start; column_index < m_occupation_grid.column_count(); column_index++) {
|
||
if (!m_occupation_grid.is_occupied(column_index, row_start)) {
|
||
found_available_column = true;
|
||
column_start = column_index;
|
||
break;
|
||
}
|
||
}
|
||
if (!found_available_column) {
|
||
column_start = m_occupation_grid.column_count();
|
||
}
|
||
m_occupation_grid.set_occupied(column_start, column_start + column_span, row_start, row_start + row_span);
|
||
|
||
m_grid_items.append(GridItem {
|
||
.box = child_box,
|
||
.row = row_start,
|
||
.row_span = row_span,
|
||
.column = column_start,
|
||
.column_span = column_span });
|
||
}
|
||
|
||
void GridFormattingContext::place_item_with_column_position(Box const& child_box, int& auto_placement_cursor_x, int& auto_placement_cursor_y)
|
||
{
|
||
int column_start;
|
||
if (child_box.computed_values().grid_column_start().raw_value() > 0) {
|
||
column_start = child_box.computed_values().grid_column_start().raw_value() - 1;
|
||
} else {
|
||
// NOTE: Negative indexes count from the end side of the explicit grid
|
||
column_start = m_explicit_columns_line_count + child_box.computed_values().grid_column_start().raw_value();
|
||
}
|
||
|
||
int column_end = child_box.computed_values().grid_column_end().raw_value() - 1;
|
||
|
||
// https://www.w3.org/TR/css-grid-2/#line-placement
|
||
// 8.3. Line-based Placement: the grid-row-start, grid-column-start, grid-row-end, and grid-column-end properties
|
||
|
||
// https://www.w3.org/TR/css-grid-2/#grid-placement-slot
|
||
// First attempt to match the grid area’s edge to a named grid area: if there is a grid line whose
|
||
// line name is <custom-ident>-start (for grid-*-start) / <custom-ident>-end (for grid-*-end),
|
||
// contributes the first such line to the grid item’s placement.
|
||
|
||
// Otherwise, treat this as if the integer 1 had been specified along with the <custom-ident>.
|
||
|
||
// https://www.w3.org/TR/css-grid-2/#grid-placement-int
|
||
// Contributes the Nth grid line to the grid item’s placement. If a negative integer is given, it
|
||
// instead counts in reverse, starting from the end edge of the explicit grid.
|
||
if (column_end < 0)
|
||
column_end = m_occupation_grid.column_count() + column_end + 2;
|
||
|
||
// If a name is given as a <custom-ident>, only lines with that name are counted. If not enough
|
||
// lines with that name exist, all implicit grid lines are assumed to have that name for the purpose
|
||
// of finding this position.
|
||
|
||
// https://www.w3.org/TR/css-grid-2/#grid-placement-span-int
|
||
// Contributes a grid span to the grid item’s placement such that the corresponding edge of the grid
|
||
// item’s grid area is N lines from its opposite edge in the corresponding direction. For example,
|
||
// grid-column-end: span 2 indicates the second grid line in the endward direction from the
|
||
// grid-column-start line.
|
||
size_t column_span = 1;
|
||
size_t row_span = child_box.computed_values().grid_row_start().is_span() ? child_box.computed_values().grid_row_start().raw_value() : 1;
|
||
if (child_box.computed_values().grid_column_start().is_position() && child_box.computed_values().grid_column_end().is_span())
|
||
column_span = child_box.computed_values().grid_column_end().raw_value();
|
||
if (child_box.computed_values().grid_column_end().is_position() && child_box.computed_values().grid_column_start().is_span()) {
|
||
column_span = child_box.computed_values().grid_column_start().raw_value();
|
||
column_start = column_end - column_span;
|
||
// FIXME: Remove me once have implemented spans overflowing into negative indexes, e.g., grid-column: span 2 / 1
|
||
if (column_start < 0)
|
||
column_start = 0;
|
||
}
|
||
// FIXME: Have yet to find the spec for this.
|
||
if (!child_box.computed_values().grid_column_start().is_position() && child_box.computed_values().grid_column_end().is_position() && column_end == 0)
|
||
column_start = 0;
|
||
|
||
// If a name is given as a <custom-ident>, only lines with that name are counted. If not enough
|
||
// lines with that name exist, all implicit grid lines on the side of the explicit grid
|
||
// corresponding to the search direction are assumed to have that name for the purpose of counting
|
||
// this span.
|
||
|
||
// https://drafts.csswg.org/css-grid/#grid-placement-auto
|
||
// auto
|
||
// The property contributes nothing to the grid item’s placement, indicating auto-placement or a
|
||
// default span of one. (See § 8 Placing Grid Items, above.)
|
||
|
||
// https://www.w3.org/TR/css-grid-2/#common-uses-named-lines
|
||
// 8.1.3. Named Lines and Spans
|
||
// Instead of counting lines by number, lines can be referenced by their line name:
|
||
if (child_box.computed_values().grid_column_end().has_line_name()) {
|
||
if (auto maybe_grid_area = m_grid_areas.get(child_box.computed_values().grid_column_end().line_name()); maybe_grid_area.has_value())
|
||
column_end = maybe_grid_area->column_end;
|
||
else if (auto line_name_index = get_line_index_by_line_name(child_box.computed_values().grid_column_end().line_name(), grid_container().computed_values().grid_template_columns()); line_name_index > -1)
|
||
column_end = line_name_index;
|
||
else
|
||
column_end = 1;
|
||
column_start = column_end - 1;
|
||
}
|
||
if (child_box.computed_values().grid_column_start().has_line_name()) {
|
||
if (auto maybe_grid_area = m_grid_areas.get(child_box.computed_values().grid_column_end().line_name()); maybe_grid_area.has_value())
|
||
column_start = maybe_grid_area->column_start;
|
||
else if (auto line_name_index = get_line_index_by_line_name(child_box.computed_values().grid_column_start().line_name(), grid_container().computed_values().grid_template_columns()); line_name_index > -1)
|
||
column_start = line_name_index;
|
||
else
|
||
column_start = 0;
|
||
}
|
||
|
||
// If there are multiple lines of the same name, they effectively establish a named set of grid
|
||
// lines, which can be exclusively indexed by filtering the placement by name:
|
||
|
||
// https://drafts.csswg.org/css-grid/#grid-placement-errors
|
||
// 8.3.1. Grid Placement Conflict Handling
|
||
// If the placement for a grid item contains two lines, and the start line is further end-ward than
|
||
// the end line, swap the two lines. If the start line is equal to the end line, remove the end
|
||
// line.
|
||
if (child_box.computed_values().grid_column_start().is_position() && child_box.computed_values().grid_column_end().is_position()) {
|
||
if (column_start > column_end)
|
||
swap(column_start, column_end);
|
||
if (column_start != column_end)
|
||
column_span = column_end - column_start;
|
||
}
|
||
|
||
// If the placement contains two spans, remove the one contributed by the end grid-placement
|
||
// property.
|
||
if (child_box.computed_values().grid_column_start().is_span() && child_box.computed_values().grid_column_end().is_span())
|
||
column_span = child_box.computed_values().grid_column_start().raw_value();
|
||
|
||
// FIXME: If the placement contains only a span for a named line, replace it with a span of 1.
|
||
|
||
// 4.1.1.1. Set the column position of the cursor to the grid item's column-start line. If this is
|
||
// less than the previous column position of the cursor, increment the row position by 1.
|
||
if (column_start < auto_placement_cursor_x)
|
||
auto_placement_cursor_y++;
|
||
auto_placement_cursor_x = column_start;
|
||
|
||
// 4.1.1.2. Increment the cursor's row position until a value is found where the grid item does not
|
||
// overlap any occupied grid cells (creating new rows in the implicit grid as necessary).
|
||
while (true) {
|
||
if (!m_occupation_grid.is_occupied(column_start, auto_placement_cursor_y)) {
|
||
break;
|
||
}
|
||
auto_placement_cursor_y++;
|
||
}
|
||
// 4.1.1.3. Set the item's row-start line to the cursor's row position, and set the item's row-end
|
||
// line according to its span from that position.
|
||
m_occupation_grid.set_occupied(column_start, column_start + column_span, auto_placement_cursor_y, auto_placement_cursor_y + row_span);
|
||
|
||
m_grid_items.append(GridItem {
|
||
.box = child_box,
|
||
.row = auto_placement_cursor_y,
|
||
.row_span = row_span,
|
||
.column = column_start,
|
||
.column_span = column_span });
|
||
}
|
||
|
||
void GridFormattingContext::place_item_with_no_declared_position(Box const& child_box, int& auto_placement_cursor_x, int& auto_placement_cursor_y)
|
||
{
|
||
// 4.1.2.1. Increment the column position of the auto-placement cursor until either this item's grid
|
||
// area does not overlap any occupied grid cells, or the cursor's column position, plus the item's
|
||
// column span, overflow the number of columns in the implicit grid, as determined earlier in this
|
||
// algorithm.
|
||
auto column_start = 0;
|
||
size_t column_span = 1;
|
||
if (child_box.computed_values().grid_column_start().is_span())
|
||
column_span = child_box.computed_values().grid_column_start().raw_value();
|
||
else if (child_box.computed_values().grid_column_end().is_span())
|
||
column_span = child_box.computed_values().grid_column_end().raw_value();
|
||
auto row_start = 0;
|
||
size_t row_span = 1;
|
||
if (child_box.computed_values().grid_row_start().is_span())
|
||
row_span = child_box.computed_values().grid_row_start().raw_value();
|
||
else if (child_box.computed_values().grid_row_end().is_span())
|
||
row_span = child_box.computed_values().grid_row_end().raw_value();
|
||
auto found_unoccupied_area = false;
|
||
|
||
while (true) {
|
||
while (auto_placement_cursor_x <= m_occupation_grid.max_column_index()) {
|
||
if (auto_placement_cursor_x + static_cast<int>(column_span) <= m_occupation_grid.max_column_index() + 1) {
|
||
auto found_all_available = true;
|
||
for (size_t span_index = 0; span_index < column_span; span_index++) {
|
||
if (m_occupation_grid.is_occupied(auto_placement_cursor_x + span_index, auto_placement_cursor_y))
|
||
found_all_available = false;
|
||
}
|
||
if (found_all_available) {
|
||
found_unoccupied_area = true;
|
||
column_start = auto_placement_cursor_x;
|
||
row_start = auto_placement_cursor_y;
|
||
break;
|
||
}
|
||
}
|
||
|
||
auto_placement_cursor_x++;
|
||
}
|
||
|
||
if (found_unoccupied_area) {
|
||
break;
|
||
}
|
||
|
||
// 4.1.2.2. If a non-overlapping position was found in the previous step, set the item's row-start
|
||
// and column-start lines to the cursor's position. Otherwise, increment the auto-placement cursor's
|
||
// row position (creating new rows in the implicit grid as necessary), set its column position to the
|
||
// start-most column line in the implicit grid, and return to the previous step.
|
||
if (!found_unoccupied_area) {
|
||
auto_placement_cursor_x = m_occupation_grid.min_column_index();
|
||
auto_placement_cursor_y++;
|
||
row_start = auto_placement_cursor_y;
|
||
}
|
||
}
|
||
|
||
m_occupation_grid.set_occupied(column_start, column_start + column_span, row_start, row_start + row_span);
|
||
m_grid_items.append(GridItem {
|
||
.box = child_box,
|
||
.row = row_start,
|
||
.row_span = row_span,
|
||
.column = column_start,
|
||
.column_span = column_span });
|
||
}
|
||
|
||
void GridFormattingContext::initialize_grid_tracks_from_definition(AvailableSpace const& available_space, Vector<CSS::ExplicitGridTrack> const& tracks_definition, Vector<GridTrack>& tracks)
|
||
{
|
||
auto track_count = get_count_of_tracks(tracks_definition, available_space);
|
||
for (auto const& track_definition : tracks_definition) {
|
||
auto repeat_count = (track_definition.is_repeat() && track_definition.repeat().is_default()) ? track_definition.repeat().repeat_count() : 1;
|
||
if (track_definition.is_repeat()) {
|
||
if (track_definition.repeat().is_auto_fill() || track_definition.repeat().is_auto_fit())
|
||
repeat_count = track_count;
|
||
}
|
||
for (auto _ = 0; _ < repeat_count; _++) {
|
||
switch (track_definition.type()) {
|
||
case CSS::ExplicitGridTrack::Type::Default:
|
||
case CSS::ExplicitGridTrack::Type::MinMax:
|
||
tracks.append(GridTrack::create_from_definition(track_definition));
|
||
break;
|
||
case CSS::ExplicitGridTrack::Type::Repeat:
|
||
for (auto& explicit_grid_track : track_definition.repeat().grid_track_size_list().track_list()) {
|
||
tracks.append(GridTrack::create_from_definition(explicit_grid_track));
|
||
}
|
||
break;
|
||
default:
|
||
VERIFY_NOT_REACHED();
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::initialize_grid_tracks_for_columns_and_rows(AvailableSpace const& available_space)
|
||
{
|
||
auto const& grid_computed_values = grid_container().computed_values();
|
||
|
||
auto const& grid_auto_columns = grid_computed_values.grid_auto_columns().track_list();
|
||
size_t implicit_column_index = 0;
|
||
// NOTE: If there are implicit tracks created by items with negative indexes they should prepend explicitly defined tracks
|
||
auto negative_index_implied_column_tracks_count = abs(m_occupation_grid.min_column_index());
|
||
for (int column_index = 0; column_index < negative_index_implied_column_tracks_count; column_index++) {
|
||
if (grid_auto_columns.size() > 0) {
|
||
auto definition = grid_auto_columns[implicit_column_index % grid_auto_columns.size()];
|
||
m_grid_columns.append(GridTrack::create_from_definition(definition));
|
||
} else {
|
||
m_grid_columns.append(GridTrack::create_auto());
|
||
}
|
||
implicit_column_index++;
|
||
}
|
||
initialize_grid_tracks_from_definition(available_space, grid_computed_values.grid_template_columns().track_list(), m_grid_columns);
|
||
for (size_t column_index = m_grid_columns.size(); column_index < m_occupation_grid.column_count(); column_index++) {
|
||
if (grid_auto_columns.size() > 0) {
|
||
auto definition = grid_auto_columns[implicit_column_index % grid_auto_columns.size()];
|
||
m_grid_columns.append(GridTrack::create_from_definition(definition));
|
||
} else {
|
||
m_grid_columns.append(GridTrack::create_auto());
|
||
}
|
||
implicit_column_index++;
|
||
}
|
||
|
||
auto const& grid_auto_rows = grid_computed_values.grid_auto_rows().track_list();
|
||
size_t implicit_row_index = 0;
|
||
// NOTE: If there are implicit tracks created by items with negative indexes they should prepend explicitly defined tracks
|
||
auto negative_index_implied_row_tracks_count = abs(m_occupation_grid.min_row_index());
|
||
for (int row_index = 0; row_index < negative_index_implied_row_tracks_count; row_index++) {
|
||
if (grid_auto_rows.size() > 0) {
|
||
auto definition = grid_auto_rows[implicit_row_index % grid_auto_rows.size()];
|
||
m_grid_rows.append(GridTrack::create_from_definition(definition));
|
||
} else {
|
||
m_grid_rows.append(GridTrack::create_auto());
|
||
}
|
||
implicit_row_index++;
|
||
}
|
||
initialize_grid_tracks_from_definition(available_space, grid_computed_values.grid_template_rows().track_list(), m_grid_rows);
|
||
for (size_t row_index = m_grid_rows.size(); row_index < m_occupation_grid.row_count(); row_index++) {
|
||
if (grid_auto_rows.size() > 0) {
|
||
auto definition = grid_auto_rows[implicit_row_index % grid_auto_rows.size()];
|
||
m_grid_rows.append(GridTrack::create_from_definition(definition));
|
||
} else {
|
||
m_grid_rows.append(GridTrack::create_auto());
|
||
}
|
||
implicit_row_index++;
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::initialize_gap_tracks(AvailableSpace const& available_space)
|
||
{
|
||
// https://www.w3.org/TR/css-grid-2/#gutters
|
||
// 11.1. Gutters: the row-gap, column-gap, and gap properties
|
||
// For the purpose of track sizing, each gutter is treated as an extra, empty, fixed-size track of
|
||
// the specified size, which is spanned by any grid items that span across its corresponding grid
|
||
// line.
|
||
if (!grid_container().computed_values().column_gap().is_auto() && m_grid_columns.size() > 0) {
|
||
auto column_gap_width = grid_container().computed_values().column_gap().to_px(grid_container(), available_space.width.to_px());
|
||
m_column_gap_tracks.ensure_capacity(m_grid_columns.size() - 1);
|
||
for (size_t column_index = 0; column_index < m_grid_columns.size(); column_index++) {
|
||
m_grid_columns_and_gaps.append(m_grid_columns[column_index]);
|
||
if (column_index != m_grid_columns.size() - 1) {
|
||
m_column_gap_tracks.append(GridTrack::create_gap(column_gap_width));
|
||
m_grid_columns_and_gaps.append(m_column_gap_tracks.last());
|
||
}
|
||
}
|
||
} else {
|
||
for (auto& track : m_grid_columns) {
|
||
m_grid_columns_and_gaps.append(track);
|
||
}
|
||
}
|
||
if (!grid_container().computed_values().row_gap().is_auto() && m_grid_rows.size() > 0) {
|
||
auto row_gap_height = grid_container().computed_values().row_gap().to_px(grid_container(), available_space.height.to_px());
|
||
m_row_gap_tracks.ensure_capacity(m_grid_rows.size() - 1);
|
||
for (size_t row_index = 0; row_index < m_grid_rows.size(); row_index++) {
|
||
m_grid_rows_and_gaps.append(m_grid_rows[row_index]);
|
||
if (row_index != m_grid_rows.size() - 1) {
|
||
m_row_gap_tracks.append(GridTrack::create_gap(row_gap_height));
|
||
m_grid_rows_and_gaps.append(m_row_gap_tracks.last());
|
||
}
|
||
}
|
||
} else {
|
||
for (auto& track : m_grid_rows) {
|
||
m_grid_rows_and_gaps.append(track);
|
||
}
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::initialize_track_sizes(AvailableSpace const& available_space, GridDimension const dimension)
|
||
{
|
||
// https://www.w3.org/TR/css-grid-2/#algo-init
|
||
// 12.4. Initialize Track Sizes
|
||
// Initialize each track’s base size and growth limit.
|
||
|
||
auto& tracks_and_gaps = dimension == GridDimension::Column ? m_grid_columns_and_gaps : m_grid_rows_and_gaps;
|
||
auto& available_size = dimension == GridDimension::Column ? available_space.width : available_space.height;
|
||
|
||
for (auto& track : tracks_and_gaps) {
|
||
if (track.is_gap)
|
||
continue;
|
||
|
||
if (track.min_track_sizing_function.is_fixed(available_size)) {
|
||
track.base_size = track.min_track_sizing_function.css_size().to_px(grid_container(), available_size.to_px());
|
||
} else if (track.min_track_sizing_function.is_intrinsic(available_size)) {
|
||
track.base_size = 0;
|
||
}
|
||
|
||
if (track.max_track_sizing_function.is_fixed(available_size)) {
|
||
track.growth_limit = track.max_track_sizing_function.css_size().to_px(grid_container(), available_size.to_px());
|
||
} else if (track.max_track_sizing_function.is_flexible_length()) {
|
||
track.growth_limit = INFINITY;
|
||
} else if (track.max_track_sizing_function.is_intrinsic(available_size)) {
|
||
track.growth_limit = INFINITY;
|
||
} else {
|
||
VERIFY_NOT_REACHED();
|
||
}
|
||
|
||
// In all cases, if the growth limit is less than the base size, increase the growth limit to match
|
||
// the base size.
|
||
if (track.growth_limit < track.base_size)
|
||
track.growth_limit = track.base_size;
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::resolve_intrinsic_track_sizes(AvailableSpace const& available_space, GridDimension const dimension)
|
||
{
|
||
// https://www.w3.org/TR/css-grid-2/#algo-content
|
||
// 12.5. Resolve Intrinsic Track Sizes
|
||
// This step resolves intrinsic track sizing functions to absolute lengths. First it resolves those
|
||
// sizes based on items that are contained wholly within a single track. Then it gradually adds in
|
||
// the space requirements of items that span multiple tracks, evenly distributing the extra space
|
||
// across those tracks insofar as possible.
|
||
|
||
auto& tracks_and_gaps = dimension == GridDimension::Column ? m_grid_columns_and_gaps : m_grid_rows_and_gaps;
|
||
|
||
// FIXME: 1. Shim baseline-aligned items so their intrinsic size contributions reflect their baseline alignment.
|
||
|
||
// 2. Size tracks to fit non-spanning items:
|
||
increase_sizes_to_accommodate_spanning_items_crossing_content_sized_tracks(available_space, dimension, 1);
|
||
|
||
// 3. Increase sizes to accommodate spanning items crossing content-sized tracks: Next, consider the
|
||
// items with a span of 2 that do not span a track with a flexible sizing function.
|
||
// Repeat incrementally for items with greater spans until all items have been considered.
|
||
size_t max_item_span = 1;
|
||
for (auto& item : m_grid_items)
|
||
max_item_span = max(item.span(dimension), max_item_span);
|
||
for (size_t span = 2; span <= max_item_span; span++) {
|
||
increase_sizes_to_accommodate_spanning_items_crossing_content_sized_tracks(available_space, dimension, 2);
|
||
}
|
||
|
||
// 4. Increase sizes to accommodate spanning items crossing flexible tracks: Next, repeat the previous
|
||
// step instead considering (together, rather than grouped by span size) all items that do span a
|
||
// track with a flexible sizing function while
|
||
increase_sizes_to_accommodate_spanning_items_crossing_flexible_tracks(dimension);
|
||
|
||
// 5. If any track still has an infinite growth limit (because, for example, it had no items placed in
|
||
// it or it is a flexible track), set its growth limit to its base size.
|
||
for (auto& track : tracks_and_gaps) {
|
||
if (!isfinite(track.growth_limit.to_double())) {
|
||
track.growth_limit = track.base_size;
|
||
}
|
||
}
|
||
}
|
||
|
||
template<typename Match>
|
||
void GridFormattingContext::distribute_extra_space_across_spanned_tracks_base_size(GridDimension dimension, CSSPixels item_size_contribution, SpaceDistributionPhase phase, Vector<GridTrack&>& spanned_tracks, Match matcher)
|
||
{
|
||
auto& available_size = dimension == GridDimension::Column ? m_available_space->width : m_available_space->height;
|
||
|
||
Vector<GridTrack&> affected_tracks;
|
||
for (auto& track : spanned_tracks) {
|
||
if (matcher(track))
|
||
affected_tracks.append(track);
|
||
}
|
||
|
||
for (auto& track : affected_tracks)
|
||
track.item_incurred_increase = 0;
|
||
|
||
// 1. Find the space to distribute:
|
||
CSSPixels spanned_tracks_sizes_sum = 0;
|
||
for (auto& track : spanned_tracks)
|
||
spanned_tracks_sizes_sum += track.base_size;
|
||
|
||
// Subtract the corresponding size of every spanned track from the item’s size contribution to find the item’s
|
||
// remaining size contribution.
|
||
auto extra_space = max(CSSPixels(0), item_size_contribution - spanned_tracks_sizes_sum);
|
||
|
||
// 2. Distribute space up to limits:
|
||
// FIXME: If a fixed-point type were used to represent CSS pixels, it would be possible to compare with 0
|
||
// instead of epsilon.
|
||
while (extra_space > NumericLimits<double>().epsilon()) {
|
||
auto all_frozen = all_of(affected_tracks, [](auto const& track) { return track.base_size_frozen; });
|
||
if (all_frozen)
|
||
break;
|
||
|
||
// Find the item-incurred increase for each spanned track with an affected size by: distributing the space
|
||
// equally among such tracks, freezing a track’s item-incurred increase as its affected size + item-incurred
|
||
// increase reaches its limit
|
||
CSSPixels increase_per_track = extra_space / affected_tracks.size();
|
||
for (auto& track : affected_tracks) {
|
||
if (track.base_size_frozen)
|
||
continue;
|
||
|
||
if (increase_per_track >= track.growth_limit) {
|
||
track.base_size_frozen = true;
|
||
track.item_incurred_increase = track.growth_limit;
|
||
extra_space -= track.growth_limit;
|
||
} else {
|
||
track.item_incurred_increase += increase_per_track;
|
||
extra_space -= increase_per_track;
|
||
}
|
||
}
|
||
}
|
||
|
||
// 3. Distribute space beyond limits
|
||
if (extra_space > 0) {
|
||
Vector<GridTrack&> tracks_to_grow_beyond_limits;
|
||
|
||
// If space remains after all tracks are frozen, unfreeze and continue to
|
||
// distribute space to the item-incurred increase of...
|
||
if (phase == SpaceDistributionPhase::AccommodateMinimumContribution || phase == SpaceDistributionPhase::AccommodateMinContentContribution) {
|
||
// when accommodating minimum contributions or accommodating min-content contributions: any affected track
|
||
// that happens to also have an intrinsic max track sizing function
|
||
for (auto& track : affected_tracks) {
|
||
if (track.max_track_sizing_function.is_intrinsic(available_size))
|
||
tracks_to_grow_beyond_limits.append(track);
|
||
}
|
||
|
||
// if there are no such tracks, then all affected tracks.
|
||
if (tracks_to_grow_beyond_limits.size() == 0)
|
||
tracks_to_grow_beyond_limits = affected_tracks;
|
||
}
|
||
// FIXME: when accommodating max-content contributions: any affected track that happens to also have a
|
||
// max-content max track sizing function; if there are no such tracks, then all affected tracks.
|
||
|
||
CSSPixels increase_per_track = extra_space / affected_tracks.size();
|
||
for (auto& track : affected_tracks)
|
||
track.item_incurred_increase += increase_per_track;
|
||
}
|
||
|
||
// 4. For each affected track, if the track’s item-incurred increase is larger than the track’s planned increase
|
||
// set the track’s planned increase to that value.
|
||
for (auto& track : affected_tracks) {
|
||
if (track.item_incurred_increase > track.planned_increase)
|
||
track.planned_increase = track.item_incurred_increase;
|
||
}
|
||
}
|
||
|
||
template<typename Match>
|
||
void GridFormattingContext::distribute_extra_space_across_spanned_tracks_growth_limit(CSSPixels item_size_contribution, Vector<GridTrack&>& spanned_tracks, Match matcher)
|
||
{
|
||
Vector<GridTrack&> affected_tracks;
|
||
for (auto& track : spanned_tracks) {
|
||
if (matcher(track))
|
||
affected_tracks.append(track);
|
||
}
|
||
|
||
for (auto& track : affected_tracks)
|
||
track.item_incurred_increase = 0;
|
||
|
||
// 1. Find the space to distribute:
|
||
CSSPixels spanned_tracks_sizes_sum = 0;
|
||
for (auto& track : spanned_tracks) {
|
||
if (isfinite(track.growth_limit.to_double())) {
|
||
spanned_tracks_sizes_sum += track.growth_limit;
|
||
} else {
|
||
spanned_tracks_sizes_sum += track.base_size;
|
||
}
|
||
}
|
||
|
||
// Subtract the corresponding size of every spanned track from the item’s size contribution to find the item’s
|
||
// remaining size contribution.
|
||
auto extra_space = max(CSSPixels(0), item_size_contribution - spanned_tracks_sizes_sum);
|
||
|
||
// 2. Distribute space up to limits:
|
||
// FIXME: If a fixed-point type were used to represent CSS pixels, it would be possible to compare with 0
|
||
// instead of epsilon.
|
||
while (extra_space > NumericLimits<double>().epsilon()) {
|
||
auto all_frozen = all_of(affected_tracks, [](auto const& track) { return track.growth_limit_frozen; });
|
||
if (all_frozen)
|
||
break;
|
||
|
||
// Find the item-incurred increase for each spanned track with an affected size by: distributing the space
|
||
// equally among such tracks, freezing a track’s item-incurred increase as its affected size + item-incurred
|
||
// increase reaches its limit
|
||
CSSPixels increase_per_track = extra_space / affected_tracks.size();
|
||
for (auto& track : affected_tracks) {
|
||
if (track.growth_limit_frozen)
|
||
continue;
|
||
|
||
// For growth limits, the limit is infinity if it is marked as infinitely growable, and equal to the
|
||
// growth limit otherwise.
|
||
auto limit = track.infinitely_growable ? INFINITY : track.growth_limit;
|
||
if (increase_per_track >= limit) {
|
||
track.growth_limit_frozen = true;
|
||
track.item_incurred_increase = limit;
|
||
extra_space -= limit;
|
||
} else {
|
||
track.item_incurred_increase += increase_per_track;
|
||
extra_space -= increase_per_track;
|
||
}
|
||
}
|
||
}
|
||
|
||
// FIXME: 3. Distribute space beyond limits
|
||
|
||
// 4. For each affected track, if the track’s item-incurred increase is larger than the track’s planned increase
|
||
// set the track’s planned increase to that value.
|
||
for (auto& track : spanned_tracks) {
|
||
if (track.item_incurred_increase > track.planned_increase)
|
||
track.planned_increase = track.item_incurred_increase;
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::increase_sizes_to_accommodate_spanning_items_crossing_content_sized_tracks(AvailableSpace const& available_space, GridDimension const dimension, size_t span)
|
||
{
|
||
auto& available_size = dimension == GridDimension::Column ? available_space.width : available_space.height;
|
||
auto& tracks = dimension == GridDimension::Column ? m_grid_columns : m_grid_rows;
|
||
for (auto& item : m_grid_items) {
|
||
auto const item_span = item.span(dimension);
|
||
if (item_span != span)
|
||
continue;
|
||
|
||
Vector<GridTrack&> spanned_tracks;
|
||
for_each_spanned_track_by_item(item, dimension, [&](GridTrack& track) {
|
||
spanned_tracks.append(track);
|
||
});
|
||
|
||
auto item_spans_tracks_with_flexible_sizing_function = any_of(spanned_tracks, [](auto& track) {
|
||
return track.min_track_sizing_function.is_flexible_length() || track.max_track_sizing_function.is_flexible_length();
|
||
});
|
||
if (item_spans_tracks_with_flexible_sizing_function)
|
||
continue;
|
||
|
||
// 1. For intrinsic minimums: First increase the base size of tracks with an intrinsic min track sizing
|
||
// function by distributing extra space as needed to accommodate these items’ minimum contributions.
|
||
auto item_size_contribution = [&] {
|
||
// If the grid container is being sized under a min- or max-content constraint, use the items’ limited
|
||
// min-content contributions in place of their minimum contributions here.
|
||
if (available_size.is_intrinsic_sizing_constraint())
|
||
return calculate_limited_min_content_contribution(item, dimension);
|
||
return calculate_minimum_contribution(item, dimension);
|
||
}();
|
||
distribute_extra_space_across_spanned_tracks_base_size(dimension, item_size_contribution, SpaceDistributionPhase::AccommodateMinimumContribution, spanned_tracks, [&](GridTrack const& track) {
|
||
return track.min_track_sizing_function.is_intrinsic(available_size);
|
||
});
|
||
for (auto& track : spanned_tracks) {
|
||
track.base_size += track.planned_increase;
|
||
track.planned_increase = 0;
|
||
}
|
||
|
||
// 2. For content-based minimums: Next continue to increase the base size of tracks with a min track
|
||
// sizing function of min-content or max-content by distributing extra space as needed to account for
|
||
// these items' min-content contributions.
|
||
auto item_min_content_contribution = calculate_min_content_contribution(item, dimension);
|
||
distribute_extra_space_across_spanned_tracks_base_size(dimension, item_min_content_contribution, SpaceDistributionPhase::AccommodateMinContentContribution, spanned_tracks, [&](GridTrack const& track) {
|
||
return track.min_track_sizing_function.is_min_content() || track.min_track_sizing_function.is_max_content();
|
||
});
|
||
for (auto& track : spanned_tracks) {
|
||
track.base_size += track.planned_increase;
|
||
track.planned_increase = 0;
|
||
}
|
||
|
||
// 3. For max-content minimums: Next, if the grid container is being sized under a max-content constraint,
|
||
// continue to increase the base size of tracks with a min track sizing function of auto or max-content by
|
||
// distributing extra space as needed to account for these items' limited max-content contributions.
|
||
if (available_size.is_max_content()) {
|
||
auto item_limited_max_content_contribution = calculate_limited_max_content_contribution(item, dimension);
|
||
distribute_extra_space_across_spanned_tracks_base_size(dimension, item_limited_max_content_contribution, SpaceDistributionPhase::AccommodateMaxContentContribution, spanned_tracks, [&](GridTrack const& track) {
|
||
return track.min_track_sizing_function.is_auto(available_size) || track.min_track_sizing_function.is_max_content();
|
||
});
|
||
for (auto& track : spanned_tracks) {
|
||
track.base_size += track.planned_increase;
|
||
track.planned_increase = 0;
|
||
}
|
||
}
|
||
|
||
// 4. If at this point any track’s growth limit is now less than its base size, increase its growth limit to
|
||
// match its base size.
|
||
for (auto& track : tracks) {
|
||
if (track.growth_limit < track.base_size)
|
||
track.growth_limit = track.base_size;
|
||
}
|
||
|
||
// 5. For intrinsic maximums: Next increase the growth limit of tracks with an intrinsic max track sizing
|
||
distribute_extra_space_across_spanned_tracks_growth_limit(item_min_content_contribution, spanned_tracks, [&](GridTrack const& track) {
|
||
return track.max_track_sizing_function.is_intrinsic(available_size);
|
||
});
|
||
for (auto& track : spanned_tracks) {
|
||
if (!isfinite(track.growth_limit.to_double())) {
|
||
// If the affected size is an infinite growth limit, set it to the track’s base size plus the planned increase.
|
||
track.growth_limit = track.base_size + track.planned_increase;
|
||
// Mark any tracks whose growth limit changed from infinite to finite in this step as infinitely growable
|
||
// for the next step.
|
||
track.infinitely_growable = true;
|
||
} else {
|
||
track.growth_limit += track.planned_increase;
|
||
}
|
||
track.planned_increase = 0;
|
||
}
|
||
|
||
// 6. For max-content maximums: Lastly continue to increase the growth limit of tracks with a max track
|
||
// sizing function of max-content by distributing extra space as needed to account for these items' max-
|
||
// content contributions.
|
||
auto item_max_content_contribution = calculate_max_content_contribution(item, dimension);
|
||
distribute_extra_space_across_spanned_tracks_growth_limit(item_max_content_contribution, spanned_tracks, [&](GridTrack const& track) {
|
||
return track.max_track_sizing_function.is_max_content() || track.max_track_sizing_function.is_auto(available_size);
|
||
});
|
||
for (auto& track : spanned_tracks) {
|
||
if (!isfinite(track.growth_limit.to_double())) {
|
||
// If the affected size is an infinite growth limit, set it to the track’s base size plus the planned increase.
|
||
track.growth_limit = track.base_size + track.planned_increase;
|
||
} else {
|
||
track.growth_limit += track.planned_increase;
|
||
}
|
||
track.planned_increase = 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::increase_sizes_to_accommodate_spanning_items_crossing_flexible_tracks(GridDimension const dimension)
|
||
{
|
||
auto& tracks = dimension == GridDimension::Column ? m_grid_columns : m_grid_rows;
|
||
for (auto& item : m_grid_items) {
|
||
Vector<GridTrack&> spanned_tracks;
|
||
for_each_spanned_track_by_item(item, dimension, [&](GridTrack& track) {
|
||
spanned_tracks.append(track);
|
||
});
|
||
|
||
auto item_spans_tracks_with_flexible_sizing_function = any_of(spanned_tracks, [](auto& track) {
|
||
return track.min_track_sizing_function.is_flexible_length() || track.max_track_sizing_function.is_flexible_length();
|
||
});
|
||
if (!item_spans_tracks_with_flexible_sizing_function)
|
||
continue;
|
||
|
||
// 1. For intrinsic minimums: First increase the base size of tracks with an intrinsic min track sizing
|
||
// function by distributing extra space as needed to accommodate these items’ minimum contributions.
|
||
auto item_minimum_contribution = automatic_minimum_size(item, dimension);
|
||
distribute_extra_space_across_spanned_tracks_base_size(dimension,
|
||
item_minimum_contribution, SpaceDistributionPhase::AccommodateMinimumContribution, spanned_tracks, [&](GridTrack const& track) {
|
||
return track.min_track_sizing_function.is_flexible_length();
|
||
});
|
||
|
||
for (auto& track : spanned_tracks) {
|
||
track.base_size += track.planned_increase;
|
||
}
|
||
|
||
// 4. If at this point any track’s growth limit is now less than its base size, increase its growth limit to
|
||
// match its base size.
|
||
for (auto& track : tracks) {
|
||
if (track.growth_limit < track.base_size)
|
||
track.growth_limit = track.base_size;
|
||
}
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::maximize_tracks(AvailableSpace const& available_space, GridDimension const dimension)
|
||
{
|
||
// https://www.w3.org/TR/css-grid-2/#algo-grow-tracks
|
||
// 12.6. Maximize Tracks
|
||
|
||
auto& tracks = dimension == GridDimension::Column ? m_grid_columns : m_grid_rows;
|
||
|
||
auto get_free_space_px = [&]() -> CSSPixels {
|
||
// For the purpose of this step: if sizing the grid container under a max-content constraint, the
|
||
// free space is infinite; if sizing under a min-content constraint, the free space is zero.
|
||
auto free_space = get_free_space(available_space, dimension);
|
||
if (free_space.is_max_content()) {
|
||
return INFINITY;
|
||
} else if (free_space.is_min_content()) {
|
||
return 0;
|
||
} else {
|
||
return free_space.to_px();
|
||
}
|
||
};
|
||
|
||
auto free_space_px = get_free_space_px();
|
||
|
||
// If the free space is positive, distribute it equally to the base sizes of all tracks, freezing
|
||
// tracks as they reach their growth limits (and continuing to grow the unfrozen tracks as needed).
|
||
while (free_space_px > 0) {
|
||
auto free_space_to_distribute_per_track = free_space_px / tracks.size();
|
||
for (auto& track : tracks) {
|
||
if (track.base_size_frozen)
|
||
continue;
|
||
VERIFY(isfinite(track.growth_limit.to_double()));
|
||
track.base_size = min(track.growth_limit, track.base_size + free_space_to_distribute_per_track);
|
||
}
|
||
if (get_free_space_px() == free_space_px)
|
||
break;
|
||
free_space_px = get_free_space_px();
|
||
}
|
||
|
||
// FIXME: If this would cause the grid to be larger than the grid container’s inner size as limited by its
|
||
// max-width/height, then redo this step, treating the available grid space as equal to the grid
|
||
// container’s inner size when it’s sized to its max-width/height.
|
||
}
|
||
|
||
void GridFormattingContext::expand_flexible_tracks(AvailableSpace const& available_space, GridDimension const dimension)
|
||
{
|
||
// https://drafts.csswg.org/css-grid/#algo-flex-tracks
|
||
// 12.7. Expand Flexible Tracks
|
||
// This step sizes flexible tracks using the largest value it can assign to an fr without exceeding
|
||
// the available space.
|
||
|
||
auto& tracks_and_gaps = dimension == GridDimension::Column ? m_grid_columns_and_gaps : m_grid_rows_and_gaps;
|
||
auto& tracks = dimension == GridDimension::Column ? m_grid_columns : m_grid_rows;
|
||
auto& available_size = dimension == GridDimension::Column ? available_space.width : available_space.height;
|
||
|
||
auto find_the_size_of_an_fr = [&](Vector<GridTrack&> tracks, CSSPixels space_to_fill) -> CSSPixels {
|
||
// https://www.w3.org/TR/css-grid-2/#algo-find-fr-size
|
||
|
||
// 1. Let leftover space be the space to fill minus the base sizes of the non-flexible grid tracks.
|
||
auto leftover_space = space_to_fill;
|
||
for (auto& track : tracks) {
|
||
if (!track.max_track_sizing_function.is_flexible_length()) {
|
||
leftover_space -= track.base_size;
|
||
}
|
||
}
|
||
|
||
// 2. Let flex factor sum be the sum of the flex factors of the flexible tracks.
|
||
// If this value is less than 1, set it to 1 instead.
|
||
auto flex_factor_sum = 0;
|
||
for (auto& track : tracks) {
|
||
if (track.max_track_sizing_function.is_flexible_length())
|
||
flex_factor_sum += track.max_track_sizing_function.flex_factor();
|
||
}
|
||
if (flex_factor_sum < 1)
|
||
flex_factor_sum = 1;
|
||
|
||
// 3. Let the hypothetical fr size be the leftover space divided by the flex factor sum.
|
||
auto hypothetical_fr_size = leftover_space / flex_factor_sum;
|
||
|
||
// FIXME: 4. If the product of the hypothetical fr size and a flexible track’s flex factor is less than the track’s
|
||
// base size, restart this algorithm treating all such tracks as inflexible.
|
||
|
||
// 5. Return the hypothetical fr size.
|
||
return hypothetical_fr_size;
|
||
};
|
||
|
||
// First, find the grid’s used flex fraction:
|
||
auto flex_fraction = [&]() {
|
||
auto free_space = get_free_space(available_space, dimension);
|
||
// If the free space is zero or if sizing the grid container under a min-content constraint:
|
||
if (free_space.to_px() == 0 || available_size.is_min_content()) {
|
||
// The used flex fraction is zero.
|
||
return CSSPixels(0);
|
||
// Otherwise, if the free space is a definite length:
|
||
} else if (free_space.is_definite()) {
|
||
// The used flex fraction is the result of finding the size of an fr using all of the grid tracks and a space
|
||
// to fill of the available grid space.
|
||
return find_the_size_of_an_fr(tracks_and_gaps, available_size.to_px());
|
||
} else {
|
||
// Otherwise, if the free space is an indefinite length:
|
||
// The used flex fraction is the maximum of:
|
||
CSSPixels result = 0;
|
||
// For each flexible track, if the flexible track’s flex factor is greater than one, the result of dividing
|
||
// the track’s base size by its flex factor; otherwise, the track’s base size.
|
||
for (auto& track : tracks) {
|
||
if (track.max_track_sizing_function.is_flexible_length()) {
|
||
if (track.max_track_sizing_function.flex_factor() > 1) {
|
||
result = max(result, track.base_size / track.max_track_sizing_function.flex_factor());
|
||
} else {
|
||
result = max(result, track.base_size);
|
||
}
|
||
}
|
||
}
|
||
// For each grid item that crosses a flexible track, the result of finding the size of an fr using all the
|
||
// grid tracks that the item crosses and a space to fill of the item’s max-content contribution.
|
||
for (auto& item : m_grid_items) {
|
||
Vector<GridTrack&> spanned_tracks;
|
||
bool crosses_flexible_track = false;
|
||
for_each_spanned_track_by_item(item, dimension, [&](GridTrack& track) {
|
||
spanned_tracks.append(track);
|
||
if (track.max_track_sizing_function.is_flexible_length())
|
||
crosses_flexible_track = true;
|
||
});
|
||
|
||
if (crosses_flexible_track)
|
||
result = max(result, find_the_size_of_an_fr(spanned_tracks, calculate_max_content_size(item, dimension)));
|
||
}
|
||
|
||
return result;
|
||
}
|
||
}();
|
||
|
||
// For each flexible track, if the product of the used flex fraction and the track’s flex factor is greater than
|
||
// the track’s base size, set its base size to that product.
|
||
for (auto& track : tracks_and_gaps) {
|
||
if (track.max_track_sizing_function.flex_factor() * flex_fraction > track.base_size) {
|
||
track.base_size = track.max_track_sizing_function.flex_factor() * flex_fraction;
|
||
}
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::stretch_auto_tracks(AvailableSpace const& available_space, GridDimension const dimension)
|
||
{
|
||
// https://drafts.csswg.org/css-grid/#algo-stretch
|
||
// 12.8. Stretch auto Tracks
|
||
|
||
auto& tracks_and_gaps = dimension == GridDimension::Column ? m_grid_columns_and_gaps : m_grid_rows_and_gaps;
|
||
auto& available_size = dimension == GridDimension::Column ? available_space.width : available_space.height;
|
||
|
||
// When the content-distribution property of the grid container is normal or stretch in this axis,
|
||
// this step expands tracks that have an auto max track sizing function by dividing any remaining
|
||
// positive, definite free space equally amongst them. If the free space is indefinite, but the grid
|
||
// container has a definite min-width/height, use that size to calculate the free space for this
|
||
// step instead.
|
||
CSSPixels used_space = 0;
|
||
for (auto& track : tracks_and_gaps) {
|
||
if (!track.max_track_sizing_function.is_auto(available_size))
|
||
used_space += track.base_size;
|
||
}
|
||
|
||
CSSPixels remaining_space = available_size.is_definite() ? available_size.to_px() - used_space : 0;
|
||
auto count_of_auto_max_sizing_tracks = 0;
|
||
for (auto& track : tracks_and_gaps) {
|
||
if (track.max_track_sizing_function.is_auto(available_size))
|
||
count_of_auto_max_sizing_tracks++;
|
||
}
|
||
|
||
for (auto& track : tracks_and_gaps) {
|
||
if (track.max_track_sizing_function.is_auto(available_size))
|
||
track.base_size = max(track.base_size, remaining_space / count_of_auto_max_sizing_tracks);
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::run_track_sizing(AvailableSpace const& available_space, GridDimension const dimension)
|
||
{
|
||
// https://www.w3.org/TR/css-grid-2/#algo-track-sizing
|
||
// 12.3. Track Sizing Algorithm
|
||
|
||
// 1. Initialize Track Sizes
|
||
initialize_track_sizes(available_space, dimension);
|
||
|
||
// 2. Resolve Intrinsic Track Sizes
|
||
resolve_intrinsic_track_sizes(available_space, dimension);
|
||
|
||
// 3. Maximize Tracks
|
||
maximize_tracks(available_space, dimension);
|
||
|
||
// 4. Expand Flexible Tracks
|
||
expand_flexible_tracks(available_space, dimension);
|
||
|
||
// 5. Expand Stretched auto Tracks
|
||
stretch_auto_tracks(available_space, dimension);
|
||
|
||
// If calculating the layout of a grid item in this step depends on the available space in the block
|
||
// axis, assume the available space that it would have if any row with a definite max track sizing
|
||
// function had that size and all other rows were infinite. If both the grid container and all
|
||
// tracks have definite sizes, also apply align-content to find the final effective size of any gaps
|
||
// spanned by such items; otherwise ignore the effects of track alignment in this estimation.
|
||
}
|
||
|
||
void GridFormattingContext::build_grid_areas()
|
||
{
|
||
// https://www.w3.org/TR/css-grid-2/#grid-template-areas-property
|
||
// If a named grid area spans multiple grid cells, but those cells do not form a single
|
||
// filled-in rectangle, the declaration is invalid.
|
||
for (size_t y = 0; y < grid_container().computed_values().grid_template_areas().size(); y++) {
|
||
for (size_t x = 0; x < grid_container().computed_values().grid_template_areas()[y].size(); x++) {
|
||
auto grid_area_name = grid_container().computed_values().grid_template_areas()[y][x];
|
||
auto maybe_grid_area = m_grid_areas.get(grid_area_name);
|
||
if (!maybe_grid_area.has_value()) {
|
||
m_grid_areas.set(grid_area_name, { grid_area_name, y, y + 1, x, x + 1 });
|
||
} else {
|
||
auto& grid_area = maybe_grid_area.value();
|
||
if (grid_area.row_start == y) {
|
||
if (grid_area.column_end == x)
|
||
grid_area.column_end = grid_area.column_end + 1;
|
||
else
|
||
return;
|
||
} else {
|
||
if (grid_area.row_end == y) {
|
||
if (grid_area.column_start != x)
|
||
return;
|
||
grid_area.row_end = grid_area.row_end + 1;
|
||
} else if (grid_area.row_end == y + 1) {
|
||
if (grid_area.column_end < x || grid_area.column_end > x + 1)
|
||
return;
|
||
} else {
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::place_grid_items(AvailableSpace const& available_space)
|
||
{
|
||
auto grid_template_columns = grid_container().computed_values().grid_template_columns();
|
||
auto grid_template_rows = grid_container().computed_values().grid_template_rows();
|
||
auto column_count = get_count_of_tracks(grid_template_columns.track_list(), available_space);
|
||
auto row_count = get_count_of_tracks(grid_template_rows.track_list(), available_space);
|
||
|
||
// https://drafts.csswg.org/css-grid/#overview-placement
|
||
// 2.2. Placing Items
|
||
// The contents of the grid container are organized into individual grid items (analogous to
|
||
// flex items), which are then assigned to predefined areas in the grid. They can be explicitly
|
||
// placed using coordinates through the grid-placement properties or implicitly placed into
|
||
// empty areas using auto-placement.
|
||
grid_container().for_each_child_of_type<Box>([&](Box& child_box) {
|
||
if (can_skip_is_anonymous_text_run(child_box))
|
||
return IterationDecision::Continue;
|
||
m_boxes_to_place.append(child_box);
|
||
return IterationDecision::Continue;
|
||
});
|
||
|
||
m_occupation_grid = OccupationGrid(column_count, row_count);
|
||
|
||
build_grid_areas();
|
||
|
||
// https://drafts.csswg.org/css-grid/#auto-placement-algo
|
||
// 8.5. Grid Item Placement Algorithm
|
||
|
||
// FIXME: 0. Generate anonymous grid items
|
||
|
||
// 1. Position anything that's not auto-positioned.
|
||
for (size_t i = 0; i < m_boxes_to_place.size(); i++) {
|
||
auto const& child_box = m_boxes_to_place[i];
|
||
if (is_auto_positioned_row(child_box->computed_values().grid_row_start(), child_box->computed_values().grid_row_end())
|
||
|| is_auto_positioned_column(child_box->computed_values().grid_column_start(), child_box->computed_values().grid_column_end()))
|
||
continue;
|
||
place_item_with_row_and_column_position(child_box);
|
||
m_boxes_to_place.remove(i);
|
||
i--;
|
||
}
|
||
|
||
// 2. Process the items locked to a given row.
|
||
// FIXME: Do "dense" packing
|
||
for (size_t i = 0; i < m_boxes_to_place.size(); i++) {
|
||
auto const& child_box = m_boxes_to_place[i];
|
||
if (is_auto_positioned_row(child_box->computed_values().grid_row_start(), child_box->computed_values().grid_row_end()))
|
||
continue;
|
||
place_item_with_row_position(child_box);
|
||
m_boxes_to_place.remove(i);
|
||
i--;
|
||
}
|
||
|
||
// 3. Determine the columns in the implicit grid.
|
||
// NOTE: "implicit grid" here is the same as the m_occupation_grid
|
||
|
||
// 3.1. Start with the columns from the explicit grid.
|
||
// NOTE: Done in step 1.
|
||
|
||
// 3.2. Among all the items with a definite column position (explicitly positioned items, items
|
||
// positioned in the previous step, and items not yet positioned but with a definite column) add
|
||
// columns to the beginning and end of the implicit grid as necessary to accommodate those items.
|
||
// NOTE: "Explicitly positioned items" and "items positioned in the previous step" done in step 1
|
||
// and 2, respectively. Adding columns for "items not yet positioned but with a definite column"
|
||
// will be done in step 4.
|
||
|
||
// 3.3. If the largest column span among all the items without a definite column position is larger
|
||
// than the width of the implicit grid, add columns to the end of the implicit grid to accommodate
|
||
// that column span.
|
||
for (auto const& child_box : m_boxes_to_place) {
|
||
int column_span = 1;
|
||
if (child_box->computed_values().grid_column_start().is_span())
|
||
column_span = child_box->computed_values().grid_column_start().raw_value();
|
||
else if (child_box->computed_values().grid_column_end().is_span())
|
||
column_span = child_box->computed_values().grid_column_end().raw_value();
|
||
|
||
if (column_span - 1 > m_occupation_grid.max_column_index())
|
||
m_occupation_grid.set_max_column_index(column_span - 1);
|
||
}
|
||
|
||
// 4. Position the remaining grid items.
|
||
// For each grid item that hasn't been positioned by the previous steps, in order-modified document
|
||
// order:
|
||
auto auto_placement_cursor_x = 0;
|
||
auto auto_placement_cursor_y = 0;
|
||
for (size_t i = 0; i < m_boxes_to_place.size(); i++) {
|
||
auto const& child_box = m_boxes_to_place[i];
|
||
// 4.1. For sparse packing:
|
||
// FIXME: no distinction made. See #4.2
|
||
|
||
// 4.1.1. If the item has a definite column position:
|
||
if (!is_auto_positioned_column(child_box->computed_values().grid_column_start(), child_box->computed_values().grid_column_end()))
|
||
place_item_with_column_position(child_box, auto_placement_cursor_x, auto_placement_cursor_y);
|
||
|
||
// 4.1.2. If the item has an automatic grid position in both axes:
|
||
else
|
||
place_item_with_no_declared_position(child_box, auto_placement_cursor_x, auto_placement_cursor_y);
|
||
|
||
m_boxes_to_place.remove(i);
|
||
i--;
|
||
|
||
// FIXME: 4.2. For dense packing:
|
||
}
|
||
|
||
// NOTE: When final implicit grid sizes are known, we can offset their positions so leftmost grid track has 0 index.
|
||
for (auto& item : m_grid_items) {
|
||
item.row = item.row - m_occupation_grid.min_row_index();
|
||
item.column = item.column - m_occupation_grid.min_column_index();
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::determine_grid_container_height()
|
||
{
|
||
CSSPixels total_y = 0;
|
||
for (auto& grid_row : m_grid_rows_and_gaps)
|
||
total_y += grid_row.base_size;
|
||
m_automatic_content_height = total_y;
|
||
}
|
||
|
||
CSS::JustifyItems GridFormattingContext::justification_for_item(Box const& box) const
|
||
{
|
||
switch (box.computed_values().justify_self()) {
|
||
case CSS::JustifySelf::Auto:
|
||
return grid_container().computed_values().justify_items();
|
||
case CSS::JustifySelf::End:
|
||
return CSS::JustifyItems::End;
|
||
case CSS::JustifySelf::Normal:
|
||
return CSS::JustifyItems::Normal;
|
||
case CSS::JustifySelf::SelfStart:
|
||
return CSS::JustifyItems::SelfStart;
|
||
case CSS::JustifySelf::SelfEnd:
|
||
return CSS::JustifyItems::SelfEnd;
|
||
case CSS::JustifySelf::FlexStart:
|
||
return CSS::JustifyItems::FlexStart;
|
||
case CSS::JustifySelf::FlexEnd:
|
||
return CSS::JustifyItems::FlexEnd;
|
||
case CSS::JustifySelf::Center:
|
||
return CSS::JustifyItems::Center;
|
||
case CSS::JustifySelf::Baseline:
|
||
return CSS::JustifyItems::Baseline;
|
||
case CSS::JustifySelf::Start:
|
||
return CSS::JustifyItems::Start;
|
||
case CSS::JustifySelf::Stretch:
|
||
return CSS::JustifyItems::Stretch;
|
||
case CSS::JustifySelf::Safe:
|
||
return CSS::JustifyItems::Safe;
|
||
case CSS::JustifySelf::Unsafe:
|
||
return CSS::JustifyItems::Unsafe;
|
||
default:
|
||
VERIFY_NOT_REACHED();
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::resolve_grid_item_widths()
|
||
{
|
||
for (auto& item : m_grid_items) {
|
||
CSSPixels containing_block_width = containing_block_size_for_item(item, GridDimension::Column);
|
||
|
||
auto& box_state = m_state.get_mutable(item.box);
|
||
|
||
auto const& computed_values = item.box->computed_values();
|
||
auto const& computed_width = computed_values.width();
|
||
|
||
auto try_compute_width = [&](CSSPixels a_width) {
|
||
CSSPixels width = a_width;
|
||
|
||
// Auto margins absorb positive free space prior to alignment via the box alignment properties.
|
||
auto free_space_left_for_margins = containing_block_width - width - box_state.border_left - box_state.border_right - box_state.padding_left - box_state.padding_right - box_state.margin_left - box_state.margin_right;
|
||
if (computed_values.margin().left().is_auto() && computed_values.margin().right().is_auto()) {
|
||
box_state.margin_left = free_space_left_for_margins / 2;
|
||
box_state.margin_right = free_space_left_for_margins / 2;
|
||
} else if (computed_values.margin().left().is_auto()) {
|
||
box_state.margin_left = free_space_left_for_margins;
|
||
} else if (computed_values.margin().right().is_auto()) {
|
||
box_state.margin_right = free_space_left_for_margins;
|
||
} else if (computed_values.width().is_auto()) {
|
||
width += free_space_left_for_margins;
|
||
}
|
||
|
||
auto free_space_left_for_alignment = containing_block_width - a_width - box_state.border_left - box_state.border_right - box_state.padding_left - box_state.padding_right - box_state.margin_left - box_state.margin_right;
|
||
switch (justification_for_item(item.box)) {
|
||
case CSS::JustifyItems::Normal:
|
||
case CSS::JustifyItems::Stretch:
|
||
return width;
|
||
case CSS::JustifyItems::Center:
|
||
box_state.margin_left += free_space_left_for_alignment / 2;
|
||
box_state.margin_right += free_space_left_for_alignment / 2;
|
||
return a_width;
|
||
case CSS::JustifyItems::Start:
|
||
case CSS::JustifyItems::FlexStart:
|
||
box_state.margin_right += free_space_left_for_alignment;
|
||
return a_width;
|
||
case CSS::JustifyItems::End:
|
||
case CSS::JustifyItems::FlexEnd:
|
||
box_state.margin_left += free_space_left_for_alignment;
|
||
return a_width;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return width;
|
||
};
|
||
|
||
CSSPixels used_width;
|
||
if (computed_width.is_auto()) {
|
||
used_width = try_compute_width(calculate_fit_content_width(item.box, get_available_space_for_item(item)));
|
||
} else if (computed_width.is_fit_content()) {
|
||
used_width = try_compute_width(calculate_fit_content_width(item.box, get_available_space_for_item(item)));
|
||
} else {
|
||
used_width = try_compute_width(computed_width.to_px(grid_container(), containing_block_width));
|
||
}
|
||
box_state.set_content_width(used_width);
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::resolve_grid_item_heights()
|
||
{
|
||
for (auto& item : m_grid_items) {
|
||
CSSPixels containing_block_height = containing_block_size_for_item(item, GridDimension::Row);
|
||
|
||
auto& box_state = m_state.get_mutable(item.box);
|
||
|
||
auto const& computed_values = item.box->computed_values();
|
||
auto const& computed_height = computed_values.height();
|
||
|
||
auto try_compute_height = [&](CSSPixels a_height) {
|
||
CSSPixels height = a_height;
|
||
auto underflow_px = containing_block_height - height - box_state.border_top - box_state.border_bottom - box_state.padding_top - box_state.padding_bottom - box_state.margin_top - box_state.margin_bottom;
|
||
if (computed_values.margin().top().is_auto() && computed_values.margin().bottom().is_auto()) {
|
||
auto half_of_the_underflow = underflow_px / 2;
|
||
box_state.margin_top = half_of_the_underflow;
|
||
box_state.margin_bottom = half_of_the_underflow;
|
||
} else if (computed_values.margin().top().is_auto()) {
|
||
box_state.margin_top = underflow_px;
|
||
} else if (computed_values.margin().bottom().is_auto()) {
|
||
box_state.margin_bottom = underflow_px;
|
||
} else if (computed_values.height().is_auto()) {
|
||
height += underflow_px;
|
||
}
|
||
|
||
return height;
|
||
};
|
||
|
||
CSSPixels used_height;
|
||
if (computed_height.is_auto()) {
|
||
used_height = try_compute_height(calculate_fit_content_height(item.box, get_available_space_for_item(item)));
|
||
} else if (computed_height.is_fit_content()) {
|
||
used_height = try_compute_height(calculate_fit_content_height(item.box, get_available_space_for_item(item)));
|
||
} else {
|
||
used_height = try_compute_height(computed_height.to_px(grid_container(), containing_block_height));
|
||
}
|
||
box_state.set_content_height(used_height);
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::resolve_items_box_metrics(GridDimension const dimension)
|
||
{
|
||
for (auto& item : m_grid_items) {
|
||
auto& box_state = m_state.get_mutable(item.box);
|
||
auto& computed_values = item.box->computed_values();
|
||
|
||
if (dimension == GridDimension::Column) {
|
||
CSSPixels containing_block_width = containing_block_size_for_item(item, GridDimension::Column);
|
||
|
||
box_state.padding_right = computed_values.padding().right().to_px(grid_container(), containing_block_width);
|
||
box_state.padding_left = computed_values.padding().left().to_px(grid_container(), containing_block_width);
|
||
|
||
box_state.margin_right = computed_values.margin().right().to_px(grid_container(), containing_block_width);
|
||
box_state.margin_left = computed_values.margin().left().to_px(grid_container(), containing_block_width);
|
||
|
||
box_state.border_right = computed_values.border_right().width;
|
||
box_state.border_left = computed_values.border_left().width;
|
||
} else {
|
||
CSSPixels containing_block_height = containing_block_size_for_item(item, GridDimension::Row);
|
||
|
||
box_state.padding_top = computed_values.padding().top().to_px(grid_container(), containing_block_height);
|
||
box_state.padding_bottom = computed_values.padding().bottom().to_px(grid_container(), containing_block_height);
|
||
|
||
box_state.margin_top = computed_values.margin().top().to_px(grid_container(), containing_block_height);
|
||
box_state.margin_bottom = computed_values.margin().bottom().to_px(grid_container(), containing_block_height);
|
||
|
||
box_state.border_top = computed_values.border_top().width;
|
||
box_state.border_bottom = computed_values.border_bottom().width;
|
||
}
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::collapse_auto_fit_tracks_if_needed(GridDimension const dimension)
|
||
{
|
||
// https://www.w3.org/TR/css-grid-2/#auto-repeat
|
||
// The auto-fit keyword behaves the same as auto-fill, except that after grid item placement any
|
||
// empty repeated tracks are collapsed. An empty track is one with no in-flow grid items placed into
|
||
// or spanning across it. (This can result in all tracks being collapsed, if they’re all empty.)
|
||
auto const& grid_computed_values = grid_container().computed_values();
|
||
auto const& tracks_definition = dimension == GridDimension::Column ? grid_computed_values.grid_template_columns().track_list() : grid_computed_values.grid_template_rows().track_list();
|
||
auto& tracks = dimension == GridDimension::Column ? m_grid_columns : m_grid_rows;
|
||
if (tracks_definition.size() == 1 && tracks_definition.first().is_repeat() && tracks_definition.first().repeat().is_auto_fit()) {
|
||
for (size_t track_index = 0; track_index < tracks.size(); track_index++) {
|
||
if (m_occupation_grid.is_occupied(dimension == GridDimension::Column ? track_index : 0, dimension == GridDimension::Row ? track_index : 0))
|
||
continue;
|
||
|
||
// NOTE: A collapsed track is treated as having a fixed track sizing function of 0px
|
||
tracks[track_index].min_track_sizing_function = CSS::GridSize(CSS::Length::make_px(0));
|
||
tracks[track_index].max_track_sizing_function = CSS::GridSize(CSS::Length::make_px(0));
|
||
}
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::run(Box const& box, LayoutMode, AvailableSpace const& available_space)
|
||
{
|
||
m_available_space = available_space;
|
||
|
||
auto const& grid_computed_values = grid_container().computed_values();
|
||
|
||
// NOTE: We store explicit grid sizes to later use in determining the position of items with negative index.
|
||
m_explicit_columns_line_count = get_count_of_tracks(grid_computed_values.grid_template_columns().track_list(), available_space) + 1;
|
||
m_explicit_rows_line_count = get_count_of_tracks(grid_computed_values.grid_template_rows().track_list(), available_space) + 1;
|
||
|
||
place_grid_items(available_space);
|
||
|
||
initialize_grid_tracks_for_columns_and_rows(available_space);
|
||
|
||
initialize_gap_tracks(available_space);
|
||
|
||
collapse_auto_fit_tracks_if_needed(GridDimension::Column);
|
||
collapse_auto_fit_tracks_if_needed(GridDimension::Row);
|
||
|
||
for (auto& item : m_grid_items) {
|
||
auto& box_state = m_state.get_mutable(item.box);
|
||
auto& computed_values = item.box->computed_values();
|
||
|
||
// NOTE: As the containing blocks of grid items are created by implicit grid areas that are not present in the
|
||
// layout tree, the initial value of has_definite_width/height computed by LayoutState::UsedValues::set_node
|
||
// will be incorrect for anything other (auto, percentage, calculated) than fixed lengths.
|
||
// Therefor, it becomes necessary to reset this value to indefinite.
|
||
// TODO: Handle this in LayoutState::UsedValues::set_node
|
||
if (!computed_values.width().is_length())
|
||
box_state.set_indefinite_content_width();
|
||
if (!computed_values.height().is_length())
|
||
box_state.set_indefinite_content_height();
|
||
}
|
||
|
||
// Do the first pass of resolving grid items box metrics to compute values that are independent of a track width
|
||
resolve_items_box_metrics(GridDimension::Column);
|
||
|
||
run_track_sizing(available_space, GridDimension::Column);
|
||
|
||
// Do the second pass of resolving box metrics to compute values that depend on a track width
|
||
resolve_items_box_metrics(GridDimension::Column);
|
||
|
||
// Once the sizes of column tracks, which determine the widths of the grid areas forming the containing blocks
|
||
// for grid items, ara calculated, it becomes possible to determine the final widths of the grid items.
|
||
resolve_grid_item_widths();
|
||
|
||
// Do the first pass of resolving grid items box metrics to compute values that are independent of a track height
|
||
resolve_items_box_metrics(GridDimension::Row);
|
||
|
||
run_track_sizing(available_space, GridDimension::Row);
|
||
|
||
// Do the second pass of resolving box metrics to compute values that depend on a track height
|
||
resolve_items_box_metrics(GridDimension::Row);
|
||
|
||
resolve_grid_item_heights();
|
||
|
||
determine_grid_container_height();
|
||
|
||
if (available_space.height.is_intrinsic_sizing_constraint() || available_space.width.is_intrinsic_sizing_constraint()) {
|
||
determine_intrinsic_size_of_grid_container(available_space);
|
||
return;
|
||
}
|
||
|
||
auto layout_box = [&](int row_start, int row_end, int column_start, int column_end, Box const& child_box) -> void {
|
||
if (column_start < 0 || row_start < 0)
|
||
return;
|
||
auto& child_box_state = m_state.get_mutable(child_box);
|
||
CSSPixels x_start = 0;
|
||
CSSPixels x_end = 0;
|
||
CSSPixels y_start = 0;
|
||
CSSPixels y_end = 0;
|
||
for (int i = 0; i < column_start; i++)
|
||
x_start += m_grid_columns_and_gaps[i].base_size;
|
||
for (int i = 0; i < column_end; i++)
|
||
x_end += m_grid_columns_and_gaps[i].base_size;
|
||
for (int i = 0; i < row_start; i++)
|
||
y_start += m_grid_rows_and_gaps[i].base_size;
|
||
for (int i = 0; i < row_end; i++) {
|
||
y_end += m_grid_rows_and_gaps[i].base_size;
|
||
}
|
||
|
||
child_box_state.offset = {
|
||
x_start + child_box_state.border_left + child_box_state.padding_left + child_box_state.margin_left,
|
||
y_start + child_box_state.border_top + child_box_state.padding_top + child_box_state.margin_top
|
||
};
|
||
|
||
compute_inset(child_box);
|
||
|
||
auto available_space_for_children = AvailableSpace(AvailableSize::make_definite(child_box_state.content_width()), AvailableSize::make_definite(child_box_state.content_height()));
|
||
if (auto independent_formatting_context = layout_inside(child_box, LayoutMode::Normal, available_space_for_children))
|
||
independent_formatting_context->parent_context_did_dimension_child_root_box();
|
||
};
|
||
|
||
for (auto& grid_item : m_grid_items) {
|
||
auto resolved_row_span = box.computed_values().row_gap().is_auto() ? grid_item.row_span : grid_item.row_span * 2;
|
||
if (!box.computed_values().row_gap().is_auto() && grid_item.gap_adjusted_row(box) == 0)
|
||
resolved_row_span -= 1;
|
||
if (grid_item.gap_adjusted_row(box) + resolved_row_span > m_grid_rows.size())
|
||
resolved_row_span = m_grid_rows_and_gaps.size() - grid_item.gap_adjusted_row(box);
|
||
|
||
auto resolved_column_span = box.computed_values().column_gap().is_auto() ? grid_item.column_span : grid_item.column_span * 2;
|
||
if (!box.computed_values().column_gap().is_auto() && grid_item.gap_adjusted_column(box) == 0)
|
||
resolved_column_span -= 1;
|
||
if (grid_item.gap_adjusted_column(box) + resolved_column_span > m_grid_columns_and_gaps.size())
|
||
resolved_column_span = m_grid_columns_and_gaps.size() - grid_item.gap_adjusted_column(box);
|
||
|
||
layout_box(
|
||
grid_item.gap_adjusted_row(box),
|
||
grid_item.gap_adjusted_row(box) + resolved_row_span,
|
||
grid_item.gap_adjusted_column(box),
|
||
grid_item.gap_adjusted_column(box) + resolved_column_span,
|
||
grid_item.box);
|
||
}
|
||
}
|
||
|
||
void GridFormattingContext::determine_intrinsic_size_of_grid_container(AvailableSpace const& available_space)
|
||
{
|
||
// https://www.w3.org/TR/css-grid-1/#intrinsic-sizes
|
||
// The max-content size (min-content size) of a grid container is the sum of the grid container’s track sizes
|
||
// (including gutters) in the appropriate axis, when the grid is sized under a max-content constraint (min-content constraint).
|
||
|
||
if (available_space.height.is_intrinsic_sizing_constraint()) {
|
||
CSSPixels grid_container_height = 0;
|
||
for (auto& track : m_grid_rows) {
|
||
grid_container_height += track.base_size;
|
||
}
|
||
m_state.get_mutable(grid_container()).set_content_height(grid_container_height);
|
||
}
|
||
|
||
if (available_space.width.is_intrinsic_sizing_constraint()) {
|
||
CSSPixels grid_container_width = 0;
|
||
for (auto& track : m_grid_columns) {
|
||
grid_container_width += track.base_size;
|
||
}
|
||
m_state.get_mutable(grid_container()).set_content_width(grid_container_width);
|
||
}
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::automatic_content_width() const
|
||
{
|
||
return m_state.get(grid_container()).content_width();
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::automatic_content_height() const
|
||
{
|
||
return m_automatic_content_height;
|
||
}
|
||
|
||
bool GridFormattingContext::is_auto_positioned_row(CSS::GridTrackPlacement const& grid_row_start, CSS::GridTrackPlacement const& grid_row_end) const
|
||
{
|
||
return is_auto_positioned_track(grid_row_start, grid_row_end);
|
||
}
|
||
|
||
bool GridFormattingContext::is_auto_positioned_column(CSS::GridTrackPlacement const& grid_column_start, CSS::GridTrackPlacement const& grid_column_end) const
|
||
{
|
||
return is_auto_positioned_track(grid_column_start, grid_column_end);
|
||
}
|
||
|
||
bool GridFormattingContext::is_auto_positioned_track(CSS::GridTrackPlacement const& grid_track_start, CSS::GridTrackPlacement const& grid_track_end) const
|
||
{
|
||
return grid_track_start.is_auto_positioned() && grid_track_end.is_auto_positioned();
|
||
}
|
||
|
||
AvailableSize GridFormattingContext::get_free_space(AvailableSpace const& available_space, GridDimension const dimension) const
|
||
{
|
||
// https://www.w3.org/TR/css-grid-2/#algo-terms
|
||
// free space: Equal to the available grid space minus the sum of the base sizes of all the grid
|
||
// tracks (including gutters), floored at zero. If available grid space is indefinite, the free
|
||
// space is indefinite as well.
|
||
auto& available_size = dimension == GridDimension::Column ? available_space.width : available_space.height;
|
||
auto& tracks = dimension == GridDimension::Column ? m_grid_columns_and_gaps : m_grid_rows_and_gaps;
|
||
if (available_size.is_definite()) {
|
||
CSSPixels sum_base_sizes = 0;
|
||
for (auto& track : tracks)
|
||
sum_base_sizes += track.base_size;
|
||
return AvailableSize::make_definite(max(CSSPixels(0), available_size.to_px() - sum_base_sizes));
|
||
}
|
||
|
||
return available_size;
|
||
}
|
||
|
||
int GridFormattingContext::get_line_index_by_line_name(String const& needle, CSS::GridTrackSizeList grid_track_size_list)
|
||
{
|
||
if (grid_track_size_list.track_list().size() == 0)
|
||
return -1;
|
||
|
||
auto repeated_tracks_count = 0;
|
||
for (size_t x = 0; x < grid_track_size_list.track_list().size(); x++) {
|
||
if (grid_track_size_list.track_list()[x].is_repeat()) {
|
||
// FIXME: Calculate amount of columns/rows if auto-fill/fit
|
||
if (!grid_track_size_list.track_list()[x].repeat().is_default())
|
||
return -1;
|
||
auto repeat = grid_track_size_list.track_list()[x].repeat().grid_track_size_list();
|
||
for (size_t y = 0; y < repeat.track_list().size(); y++) {
|
||
for (size_t z = 0; z < repeat.line_names()[y].size(); z++) {
|
||
if (repeat.line_names()[y][z] == needle)
|
||
return x + repeated_tracks_count;
|
||
repeated_tracks_count++;
|
||
}
|
||
}
|
||
} else {
|
||
for (size_t y = 0; y < grid_track_size_list.line_names()[x].size(); y++) {
|
||
if (grid_track_size_list.line_names()[x][y] == needle)
|
||
return x + repeated_tracks_count;
|
||
}
|
||
}
|
||
}
|
||
for (size_t y = 0; y < grid_track_size_list.line_names()[grid_track_size_list.track_list().size()].size(); y++) {
|
||
if (grid_track_size_list.line_names()[grid_track_size_list.track_list().size()][y] == needle)
|
||
return grid_track_size_list.track_list().size() + repeated_tracks_count;
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
void OccupationGrid::set_occupied(int column_start, int column_end, int row_start, int row_end)
|
||
{
|
||
for (int row_index = row_start; row_index < row_end; row_index++) {
|
||
for (int column_index = column_start; column_index < column_end; column_index++) {
|
||
m_min_column_index = min(m_min_column_index, column_index);
|
||
m_max_column_index = max(m_max_column_index, column_index);
|
||
m_min_row_index = min(m_min_row_index, row_index);
|
||
m_max_row_index = max(m_max_row_index, row_index);
|
||
|
||
m_occupation_grid.set(GridPosition { .row = row_index, .column = column_index });
|
||
}
|
||
}
|
||
}
|
||
|
||
bool OccupationGrid::is_occupied(int column_index, int row_index) const
|
||
{
|
||
return m_occupation_grid.contains(GridPosition { row_index, column_index });
|
||
}
|
||
|
||
int GridItem::gap_adjusted_row(Box const& grid_box) const
|
||
{
|
||
return grid_box.computed_values().row_gap().is_auto() ? row : row * 2;
|
||
}
|
||
|
||
int GridItem::gap_adjusted_column(Box const& grid_box) const
|
||
{
|
||
return grid_box.computed_values().column_gap().is_auto() ? column : column * 2;
|
||
}
|
||
|
||
CSS::Size const& GridFormattingContext::get_item_preferred_size(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
if (dimension == GridDimension::Column)
|
||
return item.box->computed_values().width();
|
||
return item.box->computed_values().height();
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::calculate_min_content_size(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
if (dimension == GridDimension::Column) {
|
||
return calculate_min_content_width(item.box);
|
||
} else {
|
||
return calculate_min_content_height(item.box, get_available_space_for_item(item).width);
|
||
}
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::calculate_max_content_size(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
if (dimension == GridDimension::Column) {
|
||
return calculate_max_content_width(item.box);
|
||
} else {
|
||
return calculate_max_content_height(item.box, get_available_space_for_item(item).width);
|
||
}
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::containing_block_size_for_item(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
CSSPixels containing_block_size = 0;
|
||
for_each_spanned_track_by_item(item, dimension, [&](GridTrack const& track) {
|
||
containing_block_size += track.base_size;
|
||
});
|
||
return containing_block_size;
|
||
}
|
||
|
||
AvailableSpace GridFormattingContext::get_available_space_for_item(GridItem const& item) const
|
||
{
|
||
auto& item_box_state = m_state.get(item.box);
|
||
AvailableSize available_width = item_box_state.has_definite_width() ? AvailableSize::make_definite(item_box_state.content_width()) : AvailableSize::make_indefinite();
|
||
AvailableSize available_height = item_box_state.has_definite_height() ? AvailableSize::make_definite(item_box_state.content_height()) : AvailableSize::make_indefinite();
|
||
return AvailableSpace(available_width, available_height);
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::calculate_min_content_contribution(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
auto available_space_for_item = get_available_space_for_item(item);
|
||
|
||
auto should_treat_preferred_size_as_auto = [&] {
|
||
if (dimension == GridDimension::Column)
|
||
return should_treat_width_as_auto(item.box, available_space_for_item);
|
||
return should_treat_height_as_auto(item.box, available_space_for_item);
|
||
}();
|
||
|
||
if (should_treat_preferred_size_as_auto) {
|
||
return item.add_margin_box_sizes(calculate_min_content_size(item, dimension), dimension, m_state);
|
||
}
|
||
|
||
auto preferred_size = get_item_preferred_size(item, dimension);
|
||
auto containing_block_size = containing_block_size_for_item(item, dimension);
|
||
return item.add_margin_box_sizes(preferred_size.to_px(grid_container(), containing_block_size), dimension, m_state);
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::calculate_max_content_contribution(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
auto available_space_for_item = get_available_space_for_item(item);
|
||
|
||
auto should_treat_preferred_size_as_auto = [&] {
|
||
if (dimension == GridDimension::Column)
|
||
return should_treat_width_as_auto(item.box, available_space_for_item);
|
||
return should_treat_height_as_auto(item.box, available_space_for_item);
|
||
}();
|
||
|
||
if (should_treat_preferred_size_as_auto) {
|
||
return item.add_margin_box_sizes(calculate_max_content_size(item, dimension), dimension, m_state);
|
||
}
|
||
|
||
auto preferred_size = get_item_preferred_size(item, dimension);
|
||
auto containing_block_size = containing_block_size_for_item(item, dimension);
|
||
return item.add_margin_box_sizes(preferred_size.to_px(grid_container(), containing_block_size), dimension, m_state);
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::calculate_limited_min_content_contribution(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
// The limited min-content contribution of an item is its min-content contribution,
|
||
// limited by the max track sizing function (which could be the argument to a fit-content() track
|
||
// sizing function) if that is fixed and ultimately floored by its minimum contribution.
|
||
// FIXME: limit by max track sizing function
|
||
auto min_content_contribution = calculate_min_content_contribution(item, dimension);
|
||
auto minimum_contribution = calculate_minimum_contribution(item, dimension);
|
||
if (min_content_contribution < minimum_contribution)
|
||
return minimum_contribution;
|
||
return min_content_contribution;
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::calculate_limited_max_content_contribution(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
// The limited max-content contribution of an item is its max-content contribution,
|
||
// limited by the max track sizing function (which could be the argument to a fit-content() track
|
||
// sizing function) if that is fixed and ultimately floored by its minimum contribution.
|
||
// FIXME: limit by max track sizing function
|
||
auto max_content_contribution = calculate_max_content_contribution(item, dimension);
|
||
auto minimum_contribution = calculate_minimum_contribution(item, dimension);
|
||
if (max_content_contribution < minimum_contribution)
|
||
return minimum_contribution;
|
||
return max_content_contribution;
|
||
}
|
||
|
||
CSS::Size const& GridFormattingContext::get_item_minimum_size(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
if (dimension == GridDimension::Column)
|
||
return item.box->computed_values().min_width();
|
||
return item.box->computed_values().min_height();
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::content_size_suggestion(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
// The content size suggestion is the min-content size in the relevant axis
|
||
// FIXME: clamped, if it has a preferred aspect ratio, by any definite opposite-axis minimum and maximum sizes
|
||
// converted through the aspect ratio.
|
||
return calculate_min_content_size(item, dimension);
|
||
}
|
||
|
||
Optional<CSSPixels> GridFormattingContext::specified_size_suggestion(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
// https://www.w3.org/TR/css-grid-1/#specified-size-suggestion
|
||
// If the item’s preferred size in the relevant axis is definite, then the specified size suggestion is that size.
|
||
// It is otherwise undefined.
|
||
auto const& used_values = m_state.get(item.box);
|
||
auto has_definite_preferred_size = dimension == GridDimension::Column ? used_values.has_definite_width() : used_values.has_definite_height();
|
||
if (has_definite_preferred_size) {
|
||
// FIXME: consider margins, padding and borders because it is outer size.
|
||
auto containing_block_size = containing_block_size_for_item(item, dimension);
|
||
return get_item_preferred_size(item, dimension).to_px(item.box, containing_block_size);
|
||
}
|
||
|
||
return {};
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::content_based_minimum_size(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
// https://www.w3.org/TR/css-grid-1/#content-based-minimum-size
|
||
// The content-based minimum size for a grid item in a given dimension is its specified size suggestion if it exists
|
||
if (auto specified_size_suggestion = this->specified_size_suggestion(item, dimension); specified_size_suggestion.has_value()) {
|
||
return specified_size_suggestion.value();
|
||
}
|
||
// FIXME: otherwise its transferred size suggestion if that exists
|
||
// else its content size suggestion
|
||
return content_size_suggestion(item, dimension);
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::automatic_minimum_size(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
// To provide a more reasonable default minimum size for grid items, the used value of its automatic minimum size
|
||
// in a given axis is the content-based minimum size if all of the following are true:
|
||
// - it is not a scroll container
|
||
// - it spans at least one track in that axis whose min track sizing function is auto
|
||
// FIXME: - if it spans more than one track in that axis, none of those tracks are flexible
|
||
auto const& tracks = dimension == GridDimension::Column ? m_grid_columns : m_grid_rows;
|
||
auto item_track_index = item.raw_position(dimension);
|
||
|
||
// FIXME: Check all tracks spanned by an item
|
||
AvailableSize const& available_size = dimension == GridDimension::Column ? m_available_space->width : m_available_space->height;
|
||
auto item_spans_auto_tracks = tracks[item_track_index].min_track_sizing_function.is_auto(available_size);
|
||
if (item_spans_auto_tracks && !item.box->is_scroll_container()) {
|
||
return content_based_minimum_size(item, dimension);
|
||
}
|
||
|
||
// Otherwise, the automatic minimum size is zero, as usual.
|
||
return 0;
|
||
}
|
||
|
||
CSSPixels GridFormattingContext::calculate_minimum_contribution(GridItem const& item, GridDimension const dimension) const
|
||
{
|
||
// The minimum contribution of an item is the smallest outer size it can have.
|
||
// Specifically, if the item’s computed preferred size behaves as auto or depends on the size of its
|
||
// containing block in the relevant axis, its minimum contribution is the outer size that would
|
||
// result from assuming the item’s used minimum size as its preferred size; else the item’s minimum
|
||
// contribution is its min-content contribution. Because the minimum contribution often depends on
|
||
// the size of the item’s content, it is considered a type of intrinsic size contribution.
|
||
|
||
auto preferred_size = get_item_preferred_size(item, dimension);
|
||
auto should_treat_preferred_size_as_auto = [&] {
|
||
if (dimension == GridDimension::Column)
|
||
return should_treat_width_as_auto(item.box, get_available_space_for_item(item));
|
||
return should_treat_height_as_auto(item.box, get_available_space_for_item(item));
|
||
}();
|
||
|
||
if (should_treat_preferred_size_as_auto) {
|
||
auto minimum_size = get_item_minimum_size(item, dimension);
|
||
if (minimum_size.is_auto())
|
||
return item.add_margin_box_sizes(automatic_minimum_size(item, dimension), dimension, m_state);
|
||
auto containing_block_size = containing_block_size_for_item(item, dimension);
|
||
return item.add_margin_box_sizes(minimum_size.to_px(grid_container(), containing_block_size), dimension, m_state);
|
||
}
|
||
|
||
return calculate_min_content_contribution(item, dimension);
|
||
}
|
||
|
||
}
|
||
|
||
namespace AK {
|
||
template<>
|
||
struct Traits<Web::Layout::GridPosition> : public GenericTraits<Web::Layout::GridPosition> {
|
||
static unsigned hash(Web::Layout::GridPosition const& key) { return pair_int_hash(key.row, key.column); }
|
||
};
|
||
}
|