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1a78edb8c9
Static position of a box is defined by formatting context type it belongs to, so let's define this algorithm separately for each FC instead of assuming FormattingContext::calculate_static_position_rect() understands how to handle all of them. Also with this change calculate_static_position_rect() is no longer virtual function.
240 lines
11 KiB
C++
240 lines
11 KiB
C++
/*
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* Copyright (c) 2021-2024, Andreas Kling <andreas@ladybird.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&, LayoutMode, 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(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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StaticPositionRect calculate_static_position_rect(Box const&) const;
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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 adjust_cross_size_through_aspect_ratio_for_main_size_min_max_constraints(Box const&, CSSPixels cross_size, CSS::Size const& min_main_size, CSS::Size const& max_main_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;
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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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