561612f219
The purpose of this new object will be to keep track of various states during an ongoing layout. Until now, we've been updating layout tree nodes as we go during layout, which adds an invisible layer of implicit serialization to the whole layout system. My idea with FormattingState is that running layout will produce a result entirely contained within the FormattingState object. At the end of layout, it can then be applied to the layout tree, or simply queried for some metrics we were trying to determine. When doing subtree layouts to determine intrinsic sizes, we will eventually be able to clone the current FormattingState, and run the subtree layout in isolation, opening up opportunities for parallelism. This first patch doesn't go very far though, it merely adds the object as a skeleton class, and makes sure the root BFC has one. :^)
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
/*
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* Copyright (c) 2020, 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 <AK/Vector.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/Layout/BlockContainer.h>
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#include <LibWeb/Layout/FormattingContext.h>
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namespace Web::Layout {
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// https://www.w3.org/TR/css-display/#block-formatting-context
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class BlockFormattingContext : public FormattingContext {
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public:
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explicit BlockFormattingContext(FormattingState&, BlockContainer&, FormattingContext* parent);
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~BlockFormattingContext();
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virtual void run(Box&, LayoutMode) override;
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bool is_initial() const;
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auto const& left_side_floats() const { return m_left_floats; }
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auto const& right_side_floats() const { return m_right_floats; }
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static float compute_theoretical_height(Box const&);
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void compute_width(Box&);
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// https://www.w3.org/TR/css-display/#block-formatting-context-root
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BlockContainer& root() { return static_cast<BlockContainer&>(context_box()); }
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BlockContainer const& root() const { return static_cast<BlockContainer const&>(context_box()); }
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virtual void parent_context_did_dimension_child_root_box() override;
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static void compute_height(Box&);
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void add_absolutely_positioned_box(Box& box) { m_absolutely_positioned_boxes.append(box); }
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protected:
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void compute_position(Box&);
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private:
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virtual bool is_block_formatting_context() const final { return true; }
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void compute_width_for_floating_box(Box&);
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void compute_width_for_block_level_replaced_element_in_normal_flow(ReplacedBox&);
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void layout_initial_containing_block(LayoutMode);
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void layout_block_level_children(BlockContainer&, LayoutMode);
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void layout_inline_children(BlockContainer&, LayoutMode);
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void compute_vertical_box_model_metrics(Box& child_box, BlockContainer const& containing_block);
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void place_block_level_element_in_normal_flow_horizontally(Box& child_box, BlockContainer const&);
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void place_block_level_element_in_normal_flow_vertically(Box& child_box, BlockContainer const&);
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void layout_floating_child(Box& child, BlockContainer const& containing_block);
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void apply_transformations_to_children(Box&);
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enum class FloatSide {
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Left,
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Right,
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};
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struct FloatSideData {
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Vector<Box&> boxes;
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float y_offset { 0 };
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};
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FloatSideData m_left_floats;
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FloatSideData m_right_floats;
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Vector<Box&> m_absolutely_positioned_boxes;
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bool m_was_notified_after_parent_dimensioned_my_root_box { false };
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};
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}
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