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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`.
34 lines
993 B
C++
34 lines
993 B
C++
/*
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* Copyright (c) 2026, Tim Ledbetter <tim.ledbetter@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/DOM/Text.h>
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#include <LibWeb/Layout/TextNode.h>
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#include <LibWeb/Layout/TextOffsetMapping.h>
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namespace Web::Layout {
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TextOffsetMapping::TextOffsetMapping(DOM::Text const& text)
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{
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m_primary = as_if<TextNode>(text.unsafe_layout_node());
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if (auto* primary_slice = as_if<TextSliceNode>(m_primary.ptr()))
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m_first_letter_slice = primary_slice->first_letter_slice();
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}
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TextNode const* TextOffsetMapping::fragment_containing(size_t dom_offset) const
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{
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auto contains = [&](TextNode const& fragment) {
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auto const start = fragment.dom_start_offset();
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return dom_offset >= start && dom_offset <= start + fragment.dom_length();
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};
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if (m_first_letter_slice && contains(*m_first_letter_slice))
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return m_first_letter_slice;
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if (m_primary && contains(*m_primary))
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return m_primary;
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return nullptr;
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}
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}
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