mirror of
https://github.com/RGBCube/serenity
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197 lines
8.3 KiB
C++
197 lines
8.3 KiB
C++
/*
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* Copyright (c) 2021, 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) override;
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Box const& flex_container() const { return context_box(); }
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private:
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SizeConstraint flex_container_main_constraint() const;
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SizeConstraint flex_container_cross_constraint() const;
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void dump_items() const;
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struct DirectionAgnosticMargins {
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float main_before { 0 };
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float main_after { 0 };
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float cross_before { 0 };
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float 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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Box& box;
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CSS::FlexBasisData used_flex_basis {};
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bool used_flex_basis_is_definite { false };
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float flex_base_size { 0 };
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float hypothetical_main_size { 0 };
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float hypothetical_cross_size { 0 };
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float 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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float target_main_size { 0 };
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bool frozen { false };
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Optional<float> flex_factor {};
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float scaled_flex_shrink_factor { 0 };
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float desired_flex_fraction { 0 };
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float main_size { 0 };
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float cross_size { 0 };
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float main_offset { 0 };
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float 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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float add_main_margin_box_sizes(float 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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float add_cross_margin_box_sizes(float 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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float cross_size { 0 };
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float remaining_free_space { 0 };
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float chosen_flex_fraction { 0 };
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};
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bool has_definite_main_size(Box const&) const;
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bool has_definite_cross_size(Box const&) const;
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float specified_main_size(Box const&) const;
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float specified_cross_size(Box const&) const;
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float resolved_definite_main_size(Box const&) const;
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float resolved_definite_cross_size(Box const&) const;
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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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float specified_main_max_size(Box const&) const;
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float specified_cross_max_size(Box const&) const;
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float calculated_main_size(Box const&) const;
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bool is_cross_auto(Box const&) const;
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float specified_main_size_of_child_box(Box const& child_box) const;
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float specified_main_min_size(Box const&) const;
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float 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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float sum_of_margin_padding_border_in_main_axis(Box const&) const;
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float automatic_minimum_size(FlexItem const&) const;
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float content_based_minimum_size(FlexItem const&) const;
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Optional<float> specified_size_suggestion(FlexItem const&) const;
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Optional<float> transferred_size_suggestion(FlexItem const&) const;
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float content_size_suggestion(FlexItem const&) const;
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CSS::LengthPercentage const& computed_main_size(Box const&) const;
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CSS::LengthPercentage const& computed_main_min_size(Box const&) const;
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CSS::LengthPercentage const& computed_main_max_size(Box const&) const;
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CSS::LengthPercentage const& computed_cross_size(Box const&) const;
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CSS::LengthPercentage const& computed_cross_min_size(Box const&) const;
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CSS::LengthPercentage const& computed_cross_max_size(Box const&) const;
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float get_pixel_width(Box const& box, Optional<CSS::LengthPercentage> const& length_percentage) const;
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float get_pixel_height(Box const& box, Optional<CSS::LengthPercentage> const& length_percentage) const;
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bool flex_item_is_stretched(FlexItem const&) const;
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void set_main_size(Box const&, float size);
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void set_cross_size(Box const&, float size);
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void set_has_definite_main_size(Box const&, bool);
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void set_has_definite_cross_size(Box const&, bool);
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void set_offset(Box const&, float main_offset, float cross_offset);
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void set_main_axis_first_margin(FlexItem&, float margin);
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void set_main_axis_second_margin(FlexItem&, float margin);
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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_main_and_cross_space(bool& main_is_constrained, bool& cross_is_constrained, float& main_min_size, float& main_max_size, float& cross_min_size, float& cross_max_size);
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float calculate_indefinite_main_size(FlexItem const&);
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void determine_flex_base_size_and_hypothetical_main_size(FlexItem&);
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void determine_main_size_of_flex_container(bool main_is_constrained, float main_min_size, float main_max_size);
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void collect_flex_items_into_flex_lines();
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void resolve_flexible_lengths();
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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(float cross_min_size, float cross_max_size);
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CSS::AlignItems alignment_for_item(FlexItem 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 determine_flex_container_used_cross_size(float cross_min_size, float cross_max_size);
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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(LayoutMode);
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[[nodiscard]] float calculate_intrinsic_main_size_of_flex_container(LayoutMode);
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[[nodiscard]] float calculate_intrinsic_cross_size_of_flex_container(LayoutMode);
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[[nodiscard]] float calculate_cross_min_content_contribution(FlexItem const&, bool resolve_percentage_min_max_sizes) const;
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[[nodiscard]] float calculate_cross_max_content_contribution(FlexItem const&, bool resolve_percentage_min_max_sizes) const;
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[[nodiscard]] float calculate_main_min_content_contribution(FlexItem const&) const;
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[[nodiscard]] float calculate_main_max_content_contribution(FlexItem const&) const;
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[[nodiscard]] float calculate_min_content_main_size(FlexItem const&) const;
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[[nodiscard]] float calculate_max_content_main_size(FlexItem const&) const;
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[[nodiscard]] float calculate_min_content_cross_size(FlexItem const&) const;
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[[nodiscard]] float calculate_max_content_cross_size(FlexItem const&) const;
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[[nodiscard]] float calculate_fit_content_main_size(FlexItem const&) const;
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[[nodiscard]] float calculate_fit_content_cross_size(FlexItem const&) const;
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virtual void parent_context_did_dimension_child_root_box() override;
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CSS::FlexBasisData 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 AvailableSpace {
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Optional<float> main;
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Optional<float> cross;
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};
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Optional<AvailableSpace> m_available_space;
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};
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}
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