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https://github.com/LadybirdBrowser/ladybird.git
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c9700e100e
This patch adds a map of Layout::Node to FormattingState::NodeState. Instead of updating layout nodes incrementally as layout progresses through the formatting contexts, all updates are now written to the corresponding NodeState instead. At the end of layout, FormattingState::commit() is called, which transfers all the values from the NodeState objects to the Node. This will soon allow us to perform completely non-destructive layouts which don't affect the tree. Note that there are many imperfections here, and still many places where we assign to the NodeState, but later read directly from the Node instead. I'm just committing at this stage to make subsequent diffs easier to understand.
128 lines
4.7 KiB
C++
128 lines
4.7 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(FormattingState&, 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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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 const&, float size);
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void set_cross_size(Box const&, float size);
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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(Box const&, float margin);
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void set_main_axis_second_margin(Box const&, 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 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, 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 const&);
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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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FormattingState::NodeState& 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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};
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}
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