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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibWeb/Layout/FormattingContext.h>
namespace Web::Layout {
class FlexFormattingContext final : public FormattingContext {
public:
FlexFormattingContext(Box& flex_container, FormattingContext* parent);
~FlexFormattingContext();
virtual bool inhibits_floating() const override { return true; }
virtual void run(Box&, LayoutMode) override;
Box& flex_container() { return context_box(); }
Box const& flex_container() const { return context_box(); }
private:
struct DirectionAgnosticMargins {
float main_before { 0 };
float main_after { 0 };
float cross_before { 0 };
float cross_after { 0 };
};
struct FlexItem {
Box& box;
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; }
float target_main_size { 0 };
bool frozen { false };
Optional<float> flex_factor {};
float scaled_flex_shrink_factor { 0 };
float max_content_flex_fraction { 0 };
float main_size { 0 };
float cross_size { 0 };
float main_offset { 0 };
float cross_offset { 0 };
DirectionAgnosticMargins margins {};
bool is_min_violation { false };
bool is_max_violation { false };
};
struct FlexLine {
Vector<FlexItem*> items;
float cross_size { 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;
bool has_main_min_size(Box const&) const;
bool has_cross_min_size(Box const&) const;
bool cross_size_is_absolute_or_resolved_nicely(NodeWithStyle const&) const;
float specified_main_max_size(Box const&) const;
float specified_cross_max_size(Box const&) const;
float calculated_main_size(Box const&) const;
bool is_cross_auto(Box const&) const;
bool is_main_axis_margin_first_auto(Box const&) const;
bool is_main_axis_margin_second_auto(Box const&) const;
float specified_main_size_of_child_box(Box const& child_box) 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 sum_of_margin_padding_border_in_main_axis(Box const&) const;
void set_main_size(Box&, float size);
void set_cross_size(Box&, float size);
void set_offset(Box&, float main_offset, float cross_offset);
void set_main_axis_first_margin(Box&, float margin);
void set_main_axis_second_margin(Box&, float margin);
void generate_anonymous_flex_items();
struct AvailableSpace {
float main { 0 };
float cross { 0 };
};
AvailableSpace determine_available_main_and_cross_space(bool& main_size_is_infinite, bool& main_is_constrained, bool& cross_is_constrained, float& main_min_size, float& main_max_size, float& cross_min_size, float& cross_max_size) const;
float layout_for_maximum_main_size(Box&);
void determine_flex_base_size_and_hypothetical_main_size(FlexItem&);
void determine_main_size_of_flex_container(bool main_is_constrained, bool main_size_is_infinite, float& main_available_size, float main_min_size, float main_max_size);
void collect_flex_items_into_flex_lines(float main_available_size);
void resolve_flexible_lengths(float main_available_size);
float determine_hypothetical_cross_size_of_item(Box&);
void calculate_cross_size_of_each_flex_line(float cross_min_size, float cross_max_size);
void determine_used_cross_size_of_each_flex_item();
void distribute_any_remaining_free_space(float main_available_size);
void align_all_flex_items_along_the_cross_axis();
void determine_flex_container_used_cross_size(float cross_min_size, float cross_max_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; }
void populate_specified_margins(FlexItem&, CSS::FlexDirection) const;
Vector<FlexLine> m_flex_lines;
Vector<FlexItem> m_flex_items;
CSS::FlexDirection m_flex_direction {};
};
}
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