126 lines
4.6 KiB
C++
126 lines
4.6 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(Box& 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&, LayoutMode) override;
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Box& flex_container() { return context_box(); }
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Box const& flex_container() const { return context_box(); }
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private:
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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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};
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struct FlexItem {
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Box& box;
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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; }
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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 max_content_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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bool is_min_violation { false };
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bool is_max_violation { false };
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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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};
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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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bool has_main_min_size(Box const&) const;
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bool has_cross_min_size(Box const&) const;
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bool cross_size_is_absolute_or_resolved_nicely(NodeWithStyle 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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bool is_main_axis_margin_first_auto(Box const&) const;
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bool is_main_axis_margin_second_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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void set_main_size(Box&, float size);
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void set_cross_size(Box&, float size);
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void set_offset(Box&, float main_offset, float cross_offset);
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void set_main_axis_first_margin(Box&, float margin);
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void set_main_axis_second_margin(Box&, float margin);
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void generate_anonymous_flex_items();
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struct AvailableSpace {
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float main { 0 };
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float cross { 0 };
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};
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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;
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float layout_for_maximum_main_size(Box&);
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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, bool main_size_is_infinite, float& main_available_size, float main_min_size, float main_max_size);
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void collect_flex_items_into_flex_lines(float main_available_size);
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void resolve_flexible_lengths(float main_available_size);
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float determine_hypothetical_cross_size_of_item(Box&);
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void calculate_cross_size_of_each_flex_line(float cross_min_size, float cross_max_size);
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void determine_used_cross_size_of_each_flex_item();
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void distribute_any_remaining_free_space(float main_available_size);
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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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void populate_specified_margins(FlexItem&, CSS::FlexDirection) const;
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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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};
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}
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