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https://github.com/LadybirdBrowser/ladybird.git
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de6f7f0029
CSS floats are now emitted by the InlineLevelIterator. When this happens, IFC coordinates with the parent BFC to float the box to the side, using the current LineBuilder state for vertical placement. This makes the "instructions" text on Acid3 render as a single contiguous flow of inline content.
117 lines
3.7 KiB
C++
117 lines
3.7 KiB
C++
/*
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* Copyright (c) 2020-2022, 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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class LineBuilder;
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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 const&, FormattingContext* parent);
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~BlockFormattingContext();
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virtual void run(Box const&, 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(FormattingState const&, Box const&);
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void compute_width(Box const&, LayoutMode = LayoutMode::Normal);
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// https://www.w3.org/TR/css-display/#block-formatting-context-root
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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 const&, FormattingState&);
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void add_absolutely_positioned_box(Box const& box) { m_absolutely_positioned_boxes.append(box); }
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SpaceUsedByFloats space_used_by_floats(float y) const;
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virtual float greatest_child_width(Box const&) override;
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void layout_floating_box(Box const& child, BlockContainer const& containing_block, LayoutMode, LineBuilder* = nullptr);
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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 const&, LayoutMode);
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void compute_width_for_block_level_replaced_element_in_normal_flow(ReplacedBox const&);
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void layout_initial_containing_block(LayoutMode);
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void layout_block_level_children(BlockContainer const&, LayoutMode);
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void layout_inline_children(BlockContainer const&, LayoutMode);
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void compute_vertical_box_model_metrics(Box const& box, BlockContainer const& containing_block);
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void place_block_level_element_in_normal_flow_horizontally(Box const& child_box, BlockContainer const&);
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void place_block_level_element_in_normal_flow_vertically(Box const& child_box, BlockContainer const&);
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void layout_list_item_marker(ListItemBox const&);
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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 FloatingBox {
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Box const& box;
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// Offset from left/right edge to the left content edge of `box`.
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float offset_from_edge { 0 };
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// Top margin edge of `box`.
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float top_margin_edge { 0 };
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// Bottom margin edge of `box`.
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float bottom_margin_edge { 0 };
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};
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struct FloatSideData {
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// Floating boxes currently accumulating on this side.
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Vector<FloatingBox&> current_boxes;
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// Combined width of boxes currently accumulating on this side.
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// This is the innermost margin of the innermost floating box.
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float current_width { 0 };
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// Highest value of `m_current_width` we've seen.
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float max_width { 0 };
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// All floating boxes encountered thus far within this BFC.
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Vector<NonnullOwnPtr<FloatingBox>> all_boxes;
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// Current Y offset from BFC root top.
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float y_offset { 0 };
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void clear()
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{
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current_boxes.clear();
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current_width = 0;
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}
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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 const&> 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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