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- /*
- * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #pragma once
- #include <LibWeb/Layout/Box.h>
- #include <LibWeb/Layout/FormattingContext.h>
- namespace Web::Layout {
- class FlexFormattingContext final : public FormattingContext {
- public:
- FlexFormattingContext(LayoutState&, Box const& flex_container, FormattingContext* parent);
- ~FlexFormattingContext();
- virtual bool inhibits_floating() const override { return true; }
- virtual void run(Box const&, LayoutMode, AvailableSpace const&) override;
- virtual float automatic_content_height() const override;
- Box const& flex_container() const { return context_box(); }
- virtual bool can_determine_size_of_child() const override;
- virtual void determine_width_of_child(Box const&, AvailableSpace const&) override;
- virtual void determine_height_of_child(Box const&, AvailableSpace const&) override;
- private:
- void dump_items() const;
- struct DirectionAgnosticMargins {
- float main_before { 0 };
- float main_after { 0 };
- float cross_before { 0 };
- float cross_after { 0 };
- bool main_before_is_auto { false };
- bool main_after_is_auto { false };
- bool cross_before_is_auto { false };
- bool cross_after_is_auto { false };
- };
- struct FlexItem {
- Box& box;
- CSS::FlexBasisData used_flex_basis {};
- bool used_flex_basis_is_definite { false };
- float flex_base_size { 0 };
- float hypothetical_main_size { 0 };
- float hypothetical_cross_size { 0 };
- 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; }
- float target_main_size { 0 };
- bool frozen { false };
- Optional<float> flex_factor {};
- float scaled_flex_shrink_factor { 0 };
- float desired_flex_fraction { 0 };
- float main_size { 0 };
- float cross_size { 0 };
- float main_offset { 0 };
- float cross_offset { 0 };
- DirectionAgnosticMargins margins {};
- DirectionAgnosticMargins borders {};
- DirectionAgnosticMargins padding {};
- bool is_min_violation { false };
- bool is_max_violation { false };
- float add_main_margin_box_sizes(float content_size) const
- {
- return content_size + margins.main_before + margins.main_after + borders.main_before + borders.main_after + padding.main_before + padding.main_after;
- }
- float add_cross_margin_box_sizes(float content_size) const
- {
- return content_size + margins.cross_before + margins.cross_after + borders.cross_before + borders.cross_after + padding.cross_before + padding.cross_after;
- }
- };
- struct FlexLine {
- Vector<FlexItem*> items;
- float cross_size { 0 };
- float remaining_free_space { 0 };
- float chosen_flex_fraction { 0 };
- };
- bool has_definite_main_size(Box const&) const;
- bool has_definite_cross_size(Box const&) const;
- float specified_main_size(Box const&) const;
- float specified_cross_size(Box const&) const;
- float resolved_definite_main_size(FlexItem const&) const;
- float resolved_definite_cross_size(FlexItem const&) const;
- bool has_main_min_size(Box const&) const;
- bool has_cross_min_size(Box const&) const;
- float specified_main_max_size(Box const&) const;
- float specified_cross_max_size(Box const&) const;
- bool is_cross_auto(Box const&) const;
- float specified_main_min_size(Box const&) const;
- float specified_cross_min_size(Box const&) const;
- bool has_main_max_size(Box const&) const;
- bool has_cross_max_size(Box const&) const;
- float automatic_minimum_size(FlexItem const&) const;
- float content_based_minimum_size(FlexItem const&) const;
- Optional<float> specified_size_suggestion(FlexItem const&) const;
- Optional<float> transferred_size_suggestion(FlexItem const&) const;
- float content_size_suggestion(FlexItem const&) const;
- CSS::Size const& computed_main_size(Box const&) const;
- CSS::Size const& computed_main_min_size(Box const&) const;
- CSS::Size const& computed_main_max_size(Box const&) const;
- CSS::Size const& computed_cross_size(Box const&) const;
- CSS::Size const& computed_cross_min_size(Box const&) const;
- CSS::Size const& computed_cross_max_size(Box const&) const;
- float get_pixel_width(Box const& box, Optional<CSS::Size> const& length_percentage) const;
- float get_pixel_height(Box const& box, Optional<CSS::Size> const& length_percentage) const;
- bool flex_item_is_stretched(FlexItem const&) const;
- void set_main_size(Box const&, float size);
- void set_cross_size(Box const&, float size);
- void set_offset(Box const&, float main_offset, float cross_offset);
- void set_main_axis_first_margin(FlexItem&, float margin);
- void set_main_axis_second_margin(FlexItem&, float margin);
- void copy_dimensions_from_flex_items_to_boxes();
- void generate_anonymous_flex_items();
- void determine_available_space_for_items(AvailableSpace const&);
- float calculate_indefinite_main_size(FlexItem const&);
- void determine_flex_base_size_and_hypothetical_main_size(FlexItem&);
- void determine_main_size_of_flex_container();
- void collect_flex_items_into_flex_lines();
- void resolve_flexible_lengths();
- void resolve_cross_axis_auto_margins();
- void determine_hypothetical_cross_size_of_item(FlexItem&, bool resolve_percentage_min_max_sizes);
- void calculate_cross_size_of_each_flex_line();
- CSS::AlignItems alignment_for_item(FlexItem const&) const;
- void determine_used_cross_size_of_each_flex_item();
- void distribute_any_remaining_free_space();
- void align_all_flex_items_along_the_cross_axis();
- void determine_flex_container_used_cross_size();
- void align_all_flex_lines();
- bool is_row_layout() const { return m_flex_direction == CSS::FlexDirection::Row || m_flex_direction == CSS::FlexDirection::RowReverse; }
- bool is_single_line() const { return flex_container().computed_values().flex_wrap() == CSS::FlexWrap::Nowrap; }
- bool is_direction_reverse() const { return m_flex_direction == CSS::FlexDirection::ColumnReverse || m_flex_direction == CSS::FlexDirection::RowReverse; }
- void populate_specified_margins(FlexItem&, CSS::FlexDirection) const;
- void determine_intrinsic_size_of_flex_container();
- [[nodiscard]] float calculate_intrinsic_main_size_of_flex_container();
- [[nodiscard]] float calculate_intrinsic_cross_size_of_flex_container();
- [[nodiscard]] float calculate_cross_min_content_contribution(FlexItem const&, bool resolve_percentage_min_max_sizes) const;
- [[nodiscard]] float calculate_cross_max_content_contribution(FlexItem const&, bool resolve_percentage_min_max_sizes) const;
- [[nodiscard]] float calculate_main_min_content_contribution(FlexItem const&) const;
- [[nodiscard]] float calculate_main_max_content_contribution(FlexItem const&) const;
- [[nodiscard]] float calculate_min_content_main_size(FlexItem const&) const;
- [[nodiscard]] float calculate_max_content_main_size(FlexItem const&) const;
- [[nodiscard]] float calculate_min_content_cross_size(FlexItem const&) const;
- [[nodiscard]] float calculate_max_content_cross_size(FlexItem const&) const;
- [[nodiscard]] float calculate_fit_content_main_size(FlexItem const&) const;
- [[nodiscard]] float calculate_fit_content_cross_size(FlexItem const&) const;
- virtual void parent_context_did_dimension_child_root_box() override;
- CSS::FlexBasisData used_flex_basis_for_item(FlexItem const&) const;
- LayoutState::UsedValues& m_flex_container_state;
- Vector<FlexLine> m_flex_lines;
- Vector<FlexItem> m_flex_items;
- CSS::FlexDirection m_flex_direction {};
- struct AxisAgnosticAvailableSpace {
- AvailableSize main;
- AvailableSize cross;
- AvailableSpace space;
- };
- Optional<AxisAgnosticAvailableSpace> m_available_space_for_items;
- Optional<AxisAgnosticAvailableSpace> m_available_space_for_flex_container;
- };
- }
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