0d656c3027
The static position of an absolutely positioned inline child is the in-flow insertion point on the line where it appears. Previously this was reconstructed after layout by walking previous siblings for a line-box fragment. That lookup could match a fragment from an earlier line and collapse multiple abspos children onto the same position, especially in white-space preserving content. Instead, drop a zero-width static-position marker into the line box at the insertion point when each abspos child is encountered. The marker is carried through normal line post-processing, including float intrusion, text-align, justification, trailing-whitespace trimming and ellipsis, so the final static position is resolved from the line itself. Resolve marker-only trailing lines before removing them, so they can provide static position without contributing line height.
76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*
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* Copyright (c) 2022, Andreas Kling <andreas@ladybird.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/InlineFormattingContext.h>
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namespace Web::Layout {
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class LineBuilder {
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AK_MAKE_NONCOPYABLE(LineBuilder);
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AK_MAKE_NONMOVABLE(LineBuilder);
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public:
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LineBuilder(InlineFormattingContext&, LayoutState&, LayoutState::UsedValues& containing_block_used_values, CSS::Direction, CSS::WritingMode);
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enum class ForcedBreak {
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No,
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Yes,
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};
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void break_line(ForcedBreak, Optional<CSSPixels> next_item_width = {});
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void append_box(Box const&, CSSPixels leading_size, CSSPixels trailing_size, CSSPixels leading_margin, CSSPixels trailing_margin);
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void append_text_chunk(TextNode const&, size_t offset_in_node, size_t length_in_node, CSSPixels leading_size, CSSPixels trailing_size, CSSPixels leading_margin, CSSPixels trailing_margin, CSSPixels content_width, CSSPixels content_height, RefPtr<Gfx::GlyphRun>);
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void append_static_position_marker(Box const&);
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// Returns whether a line break occurred.
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bool break_if_needed(CSSPixels next_item_width)
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{
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if (should_break(next_item_width)) {
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break_line(LineBuilder::ForcedBreak::No, next_item_width);
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return true;
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}
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return false;
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}
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void update_last_line();
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void remove_last_line_if_empty();
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void set_trailing_whitespace_on_previous_line();
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CSSPixels current_block_offset() const { return m_current_block_offset; }
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void recalculate_available_space();
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CSSPixels y_for_float_to_be_inserted_here(Box const&);
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void did_introduce_clearance(CSSPixels);
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private:
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void begin_new_line(bool increment_y, bool is_first_break_in_sequence = true, ForcedBreak = ForcedBreak::No);
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bool should_break(CSSPixels next_item_width);
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LineBox& ensure_last_line_box();
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InlineFormattingContext& m_context;
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LayoutState& m_layout_state;
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LayoutState::UsedValues& m_containing_block_used_values;
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AvailableSize m_available_width_for_current_line { AvailableSize::make_indefinite() };
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CSSPixels m_current_block_offset { 0 };
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CSSPixels m_max_height_on_current_line { 0 };
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CSSPixels m_text_indent { 0 };
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bool m_text_indent_hanging : 1 { false };
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bool m_text_indent_each_line : 1 { false };
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CSS::Direction m_direction { CSS::Direction::Ltr };
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CSS::WritingMode m_writing_mode { CSS::WritingMode::HorizontalTb };
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bool m_last_line_needs_update { false };
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bool m_should_advance_to_last_line_box_bottom { false };
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};
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}
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