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201 lines
8.6 KiB
C++
201 lines
8.6 KiB
C++
/*
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* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/HashMap.h>
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#include <LibGfx/Point.h>
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#include <LibWeb/Layout/Box.h>
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#include <LibWeb/Layout/LineBox.h>
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#include <LibWeb/Painting/PaintableBox.h>
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#include <LibWeb/Painting/SVGGraphicsPaintable.h>
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namespace Web::Layout {
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enum class SizeConstraint {
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None,
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MinContent,
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MaxContent,
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};
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class AvailableSize;
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class AvailableSpace;
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struct LayoutState {
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LayoutState()
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: m_root(*this)
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{
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}
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explicit LayoutState(LayoutState const* parent);
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~LayoutState();
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LayoutState const& find_root() const
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{
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LayoutState const* root = this;
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for (auto* state = m_parent; state; state = state->m_parent)
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root = state;
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return *root;
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}
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struct UsedValues {
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NodeWithStyle const& node() const { return *m_node; }
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void set_node(NodeWithStyle&, UsedValues const* containing_block_used_values);
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UsedValues const* containing_block_used_values() const { return m_containing_block_used_values; }
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CSSPixels content_width() const { return m_content_width; }
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CSSPixels content_height() const { return m_content_height; }
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void set_content_width(CSSPixels);
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void set_content_height(CSSPixels);
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void set_indefinite_content_width();
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void set_indefinite_content_height();
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void set_has_definite_width(bool has_definite_width) { m_has_definite_width = has_definite_width; }
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void set_has_definite_height(bool has_definite_height) { m_has_definite_height = has_definite_height; }
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// NOTE: These are used by FlexFormattingContext to assign a temporary main size to items
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// early on, so that descendants have something to resolve percentages against.
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void set_temporary_content_width(CSSPixels);
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void set_temporary_content_height(CSSPixels);
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bool has_definite_width() const { return m_has_definite_width && width_constraint == SizeConstraint::None; }
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bool has_definite_height() const { return m_has_definite_height && height_constraint == SizeConstraint::None; }
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// Returns the available space for content inside this layout box.
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// If the space in an axis is indefinite, and the outer space is an intrinsic sizing constraint,
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// the constraint is used in that axis instead.
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AvailableSpace available_inner_space_or_constraints_from(AvailableSpace const& outer_space) const;
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void set_content_offset(CSSPixelPoint);
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void set_content_x(CSSPixels);
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void set_content_y(CSSPixels);
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CSSPixelPoint offset;
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SizeConstraint width_constraint { SizeConstraint::None };
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SizeConstraint height_constraint { SizeConstraint::None };
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CSSPixels margin_left { 0 };
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CSSPixels margin_right { 0 };
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CSSPixels margin_top { 0 };
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CSSPixels margin_bottom { 0 };
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CSSPixels border_left { 0 };
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CSSPixels border_right { 0 };
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CSSPixels border_top { 0 };
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CSSPixels border_bottom { 0 };
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CSSPixels padding_left { 0 };
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CSSPixels padding_right { 0 };
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CSSPixels padding_top { 0 };
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CSSPixels padding_bottom { 0 };
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CSSPixels inset_left { 0 };
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CSSPixels inset_right { 0 };
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CSSPixels inset_top { 0 };
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CSSPixels inset_bottom { 0 };
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// Used for calculating the static position of an abspos block-level box.
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CSSPixels vertical_offset_of_parent_block_container { 0 };
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Vector<LineBox> line_boxes;
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CSSPixels margin_box_left() const { return margin_left + border_left_collapsed() + padding_left; }
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CSSPixels margin_box_right() const { return margin_right + border_right_collapsed() + padding_right; }
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CSSPixels margin_box_top() const { return margin_top + border_top_collapsed() + padding_top; }
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CSSPixels margin_box_bottom() const { return margin_bottom + border_bottom_collapsed() + padding_bottom; }
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CSSPixels margin_box_width() const { return margin_box_left() + content_width() + margin_box_right(); }
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CSSPixels margin_box_height() const { return margin_box_top() + content_height() + margin_box_bottom(); }
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CSSPixels border_box_left() const { return border_left_collapsed() + padding_left; }
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CSSPixels border_box_right() const { return border_right_collapsed() + padding_right; }
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CSSPixels border_box_top() const { return border_top_collapsed() + padding_top; }
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CSSPixels border_box_bottom() const { return border_bottom_collapsed() + padding_bottom; }
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CSSPixels border_box_width() const { return border_box_left() + content_width() + border_box_right(); }
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CSSPixels border_box_height() const { return border_box_top() + content_height() + border_box_bottom(); }
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Optional<LineBoxFragmentCoordinate> containing_line_box_fragment;
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void add_floating_descendant(Box const& box) { m_floating_descendants.set(&box); }
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auto const& floating_descendants() const { return m_floating_descendants; }
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void set_override_borders_data(Painting::PaintableBox::BordersDataWithElementKind const& override_borders_data) { m_override_borders_data = override_borders_data; }
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auto const& override_borders_data() const { return m_override_borders_data; }
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void set_table_cell_coordinates(Painting::PaintableBox::TableCellCoordinates const& table_cell_coordinates) { m_table_cell_coordinates = table_cell_coordinates; }
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auto const& table_cell_coordinates() const { return m_table_cell_coordinates; }
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void set_computed_svg_path(Gfx::Path const& svg_path) { m_computed_svg_path = svg_path; }
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auto& computed_svg_path() { return m_computed_svg_path; }
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void set_computed_svg_transforms(Painting::SVGGraphicsPaintable::ComputedTransforms const& computed_transforms) { m_computed_svg_transforms = computed_transforms; }
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auto const& computed_svg_transforms() const { return m_computed_svg_transforms; }
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private:
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AvailableSize available_width_inside() const;
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AvailableSize available_height_inside() const;
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bool use_collapsing_borders_model() const { return m_override_borders_data.has_value(); }
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// Implement the collapsing border model https://www.w3.org/TR/CSS22/tables.html#collapsing-borders.
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CSSPixels border_left_collapsed() const { return use_collapsing_borders_model() ? round(border_left / 2) : border_left; }
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CSSPixels border_right_collapsed() const { return use_collapsing_borders_model() ? round(border_right / 2) : border_right; }
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CSSPixels border_top_collapsed() const { return use_collapsing_borders_model() ? round(border_top / 2) : border_top; }
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CSSPixels border_bottom_collapsed() const { return use_collapsing_borders_model() ? round(border_bottom / 2) : border_bottom; }
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JS::GCPtr<Layout::NodeWithStyle> m_node { nullptr };
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UsedValues const* m_containing_block_used_values { nullptr };
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CSSPixels m_content_width { 0 };
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CSSPixels m_content_height { 0 };
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bool m_has_definite_width { false };
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bool m_has_definite_height { false };
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HashTable<JS::GCPtr<Box const>> m_floating_descendants;
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Optional<Painting::PaintableBox::BordersDataWithElementKind> m_override_borders_data;
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Optional<Painting::PaintableBox::TableCellCoordinates> m_table_cell_coordinates;
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Optional<Gfx::Path> m_computed_svg_path;
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Optional<Painting::SVGGraphicsPaintable::ComputedTransforms> m_computed_svg_transforms;
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};
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// Commits the used values produced by layout and builds a paintable tree.
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void commit(Box& root);
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// NOTE: get_mutable() will CoW the UsedValues if it's inherited from an ancestor state;
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UsedValues& get_mutable(NodeWithStyle const&);
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// NOTE: get() will not CoW the UsedValues.
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UsedValues const& get(NodeWithStyle const&) const;
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HashMap<Layout::Node const*, NonnullOwnPtr<UsedValues>> used_values_per_layout_node;
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// We cache intrinsic sizes once determined, as they will not change over the course of a full layout.
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// This avoids computing them several times while performing flex layout.
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struct IntrinsicSizes {
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Optional<CSSPixels> min_content_width;
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Optional<CSSPixels> max_content_width;
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HashMap<CSSPixels, Optional<CSSPixels>> min_content_height;
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HashMap<CSSPixels, Optional<CSSPixels>> max_content_height;
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};
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HashMap<JS::GCPtr<NodeWithStyle const>, NonnullOwnPtr<IntrinsicSizes>> mutable intrinsic_sizes;
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LayoutState const* m_parent { nullptr };
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LayoutState const& m_root;
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private:
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void resolve_relative_positions();
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};
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}
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