54beb7433e
Block placement is now divided into a vertical and horizontal step. The vertical step runs before formatting boxes internally. The horizontal step still runs after (since we may need the final width value.) This solves a long-standing architectural problem where IFC didn't know its origin Y position within the BFC root box. This is required for figuring out how to flow around floating objects. (Floating objects are always relative to the BFC root.)
74 lines
2.2 KiB
C++
74 lines
2.2 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(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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protected:
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static void compute_height(Box&);
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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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};
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}
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