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https://github.com/LadybirdBrowser/ladybird.git
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b67d73a661
We now apply first letter styles by splitting text with a first-letter style applied into 2 `TextSliceNode` objects. The `DOM::Text` layout node always points at the non first-letter slice and the first-letter slice is reachable via `TextSliceNode::first_letter_slice()`. First letter splitting works by `TreeBuilder` walking a block container's inline descendants to find the first typographic letter unit per the pattern given in css-pseudo level 4, which is then wrapped in an anonymous inline box styled with the `::first-letter` computed properties. Consumers that map between DOM offsets and layout geometry are updated to visit all slices of a `DOM::Text` through `TextOffsetMapping`.
139 lines
4.7 KiB
C++
139 lines
4.7 KiB
C++
/*
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* Copyright (c) 2018-2020, 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 <AK/Utf16String.h>
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#include <AK/Utf16View.h>
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#include <LibGfx/TextLayout.h>
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#include <LibUnicode/Segmenter.h>
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#include <LibWeb/DOM/Text.h>
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#include <LibWeb/Layout/Node.h>
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namespace Web::Layout {
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class LineBoxFragment;
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class TextSliceNode;
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class TextNode : public Node {
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GC_CELL(TextNode, Node);
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GC_DECLARE_ALLOCATOR(TextNode);
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public:
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TextNode(DOM::Document&, DOM::Text&);
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virtual ~TextNode() override;
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DOM::Text const& dom_node() const { return static_cast<DOM::Text const&>(*Node::dom_node()); }
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virtual size_t dom_start_offset() const { return 0; }
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virtual size_t dom_length() const { return dom_node().data().length_in_code_units(); }
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Utf16String const& text_for_rendering() const;
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struct Chunk {
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Utf16View view;
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NonnullRefPtr<Gfx::Font const> font;
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size_t start { 0 };
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size_t length { 0 };
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bool has_breaking_newline { false };
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bool has_breaking_tab { false };
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bool is_all_whitespace { false };
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bool can_break_after { false };
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Gfx::GlyphRun::TextType text_type;
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};
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class ChunkIterator {
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public:
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ChunkIterator(TextNode const&, bool should_wrap_lines, bool should_respect_linebreaks);
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ChunkIterator(TextNode const&, Utf16View const&, Unicode::Segmenter& grapheme_segmenter, Unicode::Segmenter& line_segmenter, CSS::WordBreak, bool should_wrap_lines, bool should_respect_linebreaks);
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bool should_wrap_lines() const { return m_should_wrap_lines; }
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bool should_respect_linebreaks() const { return m_should_respect_linebreaks; }
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bool should_collapse_whitespace() const { return m_should_collapse_whitespace; }
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Optional<Chunk> next();
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Optional<Chunk> peek(size_t);
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Chunk create_empty_chunk();
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private:
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Optional<Chunk> next_without_peek();
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Optional<Chunk> try_commit_chunk(size_t start, size_t end, bool has_breaking_newline, bool has_breaking_tab, bool can_break_after, Gfx::Font const&, Gfx::GlyphRun::TextType) const;
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[[nodiscard]] bool is_at_line_break_opportunity() const;
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[[nodiscard]] Gfx::Font const& font_for_space(size_t at_index, u32 space_code_point) const;
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bool const m_should_wrap_lines;
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bool const m_should_respect_linebreaks;
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bool m_should_collapse_whitespace;
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Utf16View m_view;
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Gfx::FontCascadeList const& m_font_cascade_list;
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Unicode::Segmenter& m_grapheme_segmenter;
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Unicode::Segmenter& m_line_segmenter;
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CSS::WordBreak m_word_break;
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size_t m_current_index { 0 };
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Vector<Chunk> m_peek_queue;
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mutable RefPtr<Gfx::Font const> m_last_non_whitespace_font;
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};
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void invalidate_text_for_rendering();
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Unicode::Segmenter& grapheme_segmenter() const;
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Unicode::Segmenter& line_segmenter() const;
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virtual RefPtr<Painting::Paintable> create_paintable() const override;
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protected:
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TextNode(DOM::Document&, DOM::Text&, AttachToDOMNode);
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private:
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virtual bool is_text_node() const final { return true; }
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void compute_text_for_rendering();
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Optional<Utf16String> m_text_for_rendering;
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mutable OwnPtr<Unicode::Segmenter> m_grapheme_segmenter;
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mutable OwnPtr<Unicode::Segmenter> m_line_segmenter;
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};
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class TextSliceNode final : public TextNode {
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GC_CELL(TextSliceNode, TextNode);
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GC_DECLARE_ALLOCATOR(TextSliceNode);
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public:
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TextSliceNode(DOM::Document&, DOM::Text&, AttachToDOMNode, size_t dom_start_offset, size_t dom_length);
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virtual ~TextSliceNode() override;
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virtual size_t dom_start_offset() const override { return m_dom_start_offset; }
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virtual size_t dom_length() const override { return m_dom_length_in_code_units; }
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// Only meaningful on a remainder slice. Returns the first-letter slice that renders the leading
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// sub-range of the same DOM::Text, or nullptr if first-letter is not active for this DOM::Text.
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TextSliceNode const* first_letter_slice() const { return m_first_letter_slice; }
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TextSliceNode* first_letter_slice() { return m_first_letter_slice; }
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void set_first_letter_slice(TextSliceNode& slice) { m_first_letter_slice = slice; }
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private:
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virtual bool is_text_slice_node() const override { return true; }
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virtual void visit_edges(Cell::Visitor&) override;
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size_t m_dom_start_offset { 0 };
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size_t m_dom_length_in_code_units { 0 };
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GC::Ptr<TextSliceNode> m_first_letter_slice;
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};
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template<>
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inline bool Node::fast_is<TextNode>() const { return is_text_node(); }
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template<>
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inline bool Node::fast_is<TextSliceNode>() const { return is_text_slice_node(); }
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}
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