feat(ios): add VoiceOver element tree for rendered markdown - #655
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Matches the Android package's TalkBack virtual view hierarchy. The
rendered attributed string is segmented into per-element VoiceOver
nodes: paragraphs split on newlines with spacer lines dropped, and
heading, link, and image runs carved into their own elements with
plain text between them.
Headings carry the header trait plus the heading-level text attribute
("heading, level N"), links activate the onLinkPress handler via
accessibilityActivate, images read their alt text, and list items
announce their position ("bullet point", "list item N", with a
"nested" prefix) exactly like Android. A list item's extent is the
intersection of its number and depth attribute runs, since either
alone merges with a neighbor.
Element frames resolve lazily from TextKit 2 layout on every query, so
scrolling and Dynamic Type changes never leave stale bounds. Requires
iOS 16 (frame math goes through textLayoutManager); iOS 15 keeps the
stock single-element behavior.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Matches the Android package's TalkBack virtual view hierarchy. The rendered attributed string is segmented into per-element VoiceOver nodes: paragraphs split on newlines with spacer lines dropped, and heading, link, and image runs carved into their own elements with plain text between them.
Headings carry the header trait plus the heading-level text attribute ("heading, level N"), links activate the onLinkPress handler via accessibilityActivate, images read their alt text, and list items announce their position ("bullet point", "list item N", with a "nested" prefix) exactly like Android. A list item's extent is the intersection of its number and depth attribute runs, since either alone merges with a neighbor.
Element frames resolve lazily from TextKit 2 layout on every query, so scrolling and Dynamic Type changes never leave stale bounds. Requires iOS 16 (frame math goes through textLayoutManager); iOS 15 keeps the stock single-element behavior.
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