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d37c0a2cab
Although the flex algorithm as specified does say to determine the cross size of the flex container, this is not how our layout engine works. The parent formatting context is responsible for sizing its children, and since that's already happening, we can simply remove the cross sizing step from FFC.
239 lines
10 KiB
C++
239 lines
10 KiB
C++
/*
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* Copyright (c) 2021-2024, 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 <LibWeb/Layout/Box.h>
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#include <LibWeb/Layout/FormattingContext.h>
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namespace Web::Layout {
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class FlexFormattingContext final : public FormattingContext {
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public:
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FlexFormattingContext(LayoutState&, Box const& flex_container, FormattingContext* parent);
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~FlexFormattingContext();
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virtual bool inhibits_floating() const override { return true; }
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virtual void run(Box const&, LayoutMode, AvailableSpace const&) override;
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virtual CSSPixels automatic_content_width() const override;
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virtual CSSPixels automatic_content_height() const override;
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Box const& flex_container() const { return context_box(); }
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virtual CSSPixelPoint calculate_static_position(Box const&) const override;
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private:
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[[nodiscard]] bool should_treat_main_size_as_auto(Box const&) const;
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[[nodiscard]] bool should_treat_cross_size_as_auto(Box const&) const;
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[[nodiscard]] bool should_treat_main_max_size_as_none(Box const&) const;
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[[nodiscard]] bool should_treat_cross_max_size_as_none(Box const&) const;
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[[nodiscard]] CSSPixels adjust_main_size_through_aspect_ratio_for_cross_size_min_max_constraints(Box const&, CSSPixels main_size, CSS::Size const& min_cross_size, CSS::Size const& max_cross_size) const;
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[[nodiscard]] CSSPixels calculate_main_size_from_cross_size_and_aspect_ratio(CSSPixels cross_size, CSSPixelFraction aspect_ratio) const;
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[[nodiscard]] CSSPixels calculate_cross_size_from_main_size_and_aspect_ratio(CSSPixels main_size, CSSPixelFraction aspect_ratio) const;
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void dump_items() const;
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struct DirectionAgnosticMargins {
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CSSPixels main_before { 0 };
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CSSPixels main_after { 0 };
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CSSPixels cross_before { 0 };
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CSSPixels cross_after { 0 };
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bool main_before_is_auto { false };
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bool main_after_is_auto { false };
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bool cross_before_is_auto { false };
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bool cross_after_is_auto { false };
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};
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struct FlexItem {
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JS::NonnullGCPtr<Box> box;
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LayoutState::UsedValues& used_values;
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Optional<CSS::FlexBasis> used_flex_basis {};
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bool used_flex_basis_is_definite { false };
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CSSPixels flex_base_size { 0 };
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CSSPixels hypothetical_main_size { 0 };
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CSSPixels hypothetical_cross_size { 0 };
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CSSPixels hypothetical_cross_size_with_margins() { return hypothetical_cross_size + margins.cross_before + margins.cross_after + borders.cross_after + borders.cross_before + padding.cross_after + padding.cross_before; }
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CSSPixels target_main_size { 0 };
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bool frozen { false };
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Optional<double> flex_factor {};
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double scaled_flex_shrink_factor { 0 };
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double desired_flex_fraction { 0 };
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CSSPixels outer_hypothetical_main_size() const
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{
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return hypothetical_main_size + margins.main_before + margins.main_after + borders.main_before + borders.main_after + padding.main_before + padding.main_after;
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}
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CSSPixels outer_target_main_size() const
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{
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return target_main_size + margins.main_before + margins.main_after + borders.main_before + borders.main_after + padding.main_before + padding.main_after;
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}
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CSSPixels outer_flex_base_size() const
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{
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return flex_base_size + margins.main_before + margins.main_after + borders.main_before + borders.main_after + padding.main_before + padding.main_after;
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}
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// The used main size of this flex item. Empty until determined.
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Optional<CSSPixels> main_size {};
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// The used cross size of this flex item. Empty until determined.
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Optional<CSSPixels> cross_size {};
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CSSPixels main_offset { 0 };
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CSSPixels cross_offset { 0 };
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DirectionAgnosticMargins margins {};
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DirectionAgnosticMargins borders {};
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DirectionAgnosticMargins padding {};
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bool is_min_violation { false };
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bool is_max_violation { false };
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CSSPixels add_main_margin_box_sizes(CSSPixels content_size) const
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{
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return content_size + margins.main_before + margins.main_after + borders.main_before + borders.main_after + padding.main_before + padding.main_after;
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}
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CSSPixels add_cross_margin_box_sizes(CSSPixels content_size) const
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{
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return content_size + margins.cross_before + margins.cross_after + borders.cross_before + borders.cross_after + padding.cross_before + padding.cross_after;
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}
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};
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struct FlexLine {
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Vector<FlexItem&> items;
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CSSPixels cross_size { 0 };
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Optional<CSSPixels> remaining_free_space;
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double chosen_flex_fraction { 0 };
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double sum_of_flex_factor_of_unfrozen_items() const;
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double sum_of_scaled_flex_shrink_factor_of_unfrozen_items() const;
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};
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CSSPixels main_gap() const;
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CSSPixels cross_gap() const;
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[[nodiscard]] bool has_definite_main_size(LayoutState::UsedValues const&) const;
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[[nodiscard]] bool has_definite_cross_size(LayoutState::UsedValues const&) const;
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[[nodiscard]] bool has_definite_main_size(FlexItem const& item) const { return has_definite_main_size(item.used_values); }
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[[nodiscard]] bool has_definite_cross_size(FlexItem const& item) const { return has_definite_cross_size(item.used_values); }
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[[nodiscard]] CSSPixels inner_main_size(LayoutState::UsedValues const&) const;
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[[nodiscard]] CSSPixels inner_cross_size(LayoutState::UsedValues const&) const;
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[[nodiscard]] CSSPixels inner_main_size(FlexItem const& item) const { return inner_main_size(item.used_values); }
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[[nodiscard]] CSSPixels inner_cross_size(FlexItem const& item) const { return inner_cross_size(item.used_values); }
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bool has_main_min_size(Box const&) const;
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bool has_cross_min_size(Box const&) const;
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CSSPixels specified_main_max_size(Box const&) const;
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CSSPixels specified_cross_max_size(Box const&) const;
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bool is_cross_auto(Box const&) const;
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CSSPixels specified_main_min_size(Box const&) const;
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CSSPixels specified_cross_min_size(Box const&) const;
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bool has_main_max_size(Box const&) const;
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bool has_cross_max_size(Box const&) const;
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CSSPixels automatic_minimum_size(FlexItem const&) const;
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CSSPixels content_based_minimum_size(FlexItem const&) const;
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Optional<CSSPixels> specified_size_suggestion(FlexItem const&) const;
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Optional<CSSPixels> transferred_size_suggestion(FlexItem const&) const;
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CSSPixels content_size_suggestion(FlexItem const&) const;
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CSS::Size const& computed_main_size(Box const&) const;
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CSS::Size const& computed_main_min_size(Box const&) const;
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CSS::Size const& computed_main_max_size(Box const&) const;
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CSS::Size const& computed_cross_size(Box const&) const;
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CSS::Size const& computed_cross_min_size(Box const&) const;
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CSS::Size const& computed_cross_max_size(Box const&) const;
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CSSPixels get_pixel_width(Box const&, CSS::Size const&) const;
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CSSPixels get_pixel_height(Box const&, CSS::Size const&) const;
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bool flex_item_is_stretched(FlexItem const&) const;
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void set_main_size(Box const&, CSSPixels size);
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void set_cross_size(Box const&, CSSPixels size);
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void set_offset(Box const&, CSSPixels main_offset, CSSPixels cross_offset);
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void set_main_axis_first_margin(FlexItem&, CSSPixels margin);
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void set_main_axis_second_margin(FlexItem&, CSSPixels margin);
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void set_has_definite_main_size(FlexItem&);
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void set_has_definite_cross_size(FlexItem&);
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void copy_dimensions_from_flex_items_to_boxes();
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void generate_anonymous_flex_items();
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void determine_available_space_for_items(AvailableSpace const&);
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void determine_flex_base_size_and_hypothetical_main_size(FlexItem&);
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void collect_flex_items_into_flex_lines();
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void resolve_flexible_lengths();
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void resolve_flexible_lengths_for_line(FlexLine&);
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void resolve_cross_axis_auto_margins();
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void determine_hypothetical_cross_size_of_item(FlexItem&, bool resolve_percentage_min_max_sizes);
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void calculate_cross_size_of_each_flex_line();
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void handle_align_content_stretch();
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CSS::AlignItems alignment_for_item(Box const&) const;
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void determine_used_cross_size_of_each_flex_item();
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void distribute_any_remaining_free_space();
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void align_all_flex_items_along_the_cross_axis();
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void align_all_flex_lines();
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bool is_row_layout() const { return m_flex_direction == CSS::FlexDirection::Row || m_flex_direction == CSS::FlexDirection::RowReverse; }
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bool is_single_line() const { return flex_container().computed_values().flex_wrap() == CSS::FlexWrap::Nowrap; }
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bool is_direction_reverse() const { return m_flex_direction == CSS::FlexDirection::ColumnReverse || m_flex_direction == CSS::FlexDirection::RowReverse; }
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void populate_specified_margins(FlexItem&, CSS::FlexDirection) const;
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void determine_intrinsic_size_of_flex_container();
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[[nodiscard]] CSSPixels calculate_intrinsic_main_size_of_flex_container();
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[[nodiscard]] CSSPixels calculate_intrinsic_cross_size_of_flex_container();
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[[nodiscard]] CSSPixels calculate_cross_min_content_contribution(FlexItem const&, bool resolve_percentage_min_max_sizes) const;
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[[nodiscard]] CSSPixels calculate_cross_max_content_contribution(FlexItem const&, bool resolve_percentage_min_max_sizes) const;
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[[nodiscard]] CSSPixels calculate_main_min_content_contribution(FlexItem const&) const;
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[[nodiscard]] CSSPixels calculate_main_max_content_contribution(FlexItem const&) const;
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[[nodiscard]] CSSPixels calculate_min_content_main_size(FlexItem const&) const;
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[[nodiscard]] CSSPixels calculate_max_content_main_size(FlexItem const&) const;
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[[nodiscard]] CSSPixels calculate_min_content_cross_size(FlexItem const&) const;
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[[nodiscard]] CSSPixels calculate_max_content_cross_size(FlexItem const&) const;
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[[nodiscard]] CSSPixels calculate_fit_content_main_size(FlexItem const&) const;
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[[nodiscard]] CSSPixels calculate_fit_content_cross_size(FlexItem const&) const;
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[[nodiscard]] CSSPixels calculate_width_to_use_when_determining_intrinsic_height_of_item(FlexItem const&) const;
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virtual void parent_context_did_dimension_child_root_box() override;
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CSS::FlexBasis used_flex_basis_for_item(FlexItem const&) const;
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LayoutState::UsedValues& m_flex_container_state;
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Vector<FlexLine> m_flex_lines;
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Vector<FlexItem> m_flex_items;
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CSS::FlexDirection m_flex_direction {};
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struct AxisAgnosticAvailableSpace {
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AvailableSize main;
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AvailableSize cross;
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AvailableSpace space;
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};
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Optional<AxisAgnosticAvailableSpace> m_available_space_for_items;
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};
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}
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