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[Math.round(mins / 60), "hour"] : [Math.round(mins / 1440), "day"] return n === 1 ? `A${unit === "hour" ? "n" : ""} ${unit} later` : `${n} ${unit}s later` } /** How far the lapse spreads its letters, 0 to 1: the marker's own scale, a minute (a breath) to a week (the widest). */ const lapseOf = (mins: number) => Math.min(1, Math.log1p(mins) / Math.log1p(7 * 1440)) /** * Rests: each message's gap grows with the log of the minutes since the one before (read from its ). * A day divider breaks the count, since it already says the time has passed. */ function measureRests(scroller: HTMLElement) { let prev: number | undefined for (const n of Array.from(scroller.children)) { if (!(n instanceof HTMLElement)) continue if (n.matches('[data-slot="thread-day"]')) { prev = undefined continue } if (!n.matches('[data-slot="message"]')) continue const t = Date.parse(n.querySelector("time")?.dateTime ?? "") const mins = prev === undefined || Number.isNaN(t) ? undefined : (t - prev) / 60000 if (!Number.isNaN(t)) prev = t if (mins === undefined || mins < 0) { n.style.removeProperty("--ot-rest") n.style.removeProperty("--ot-lapse") delete n.dataset.rest continue } n.style.setProperty("--ot-rest", Math.log2(1 + mins).toFixed(2)) n.style.setProperty("--ot-lapse", lapseOf(mins).toFixed(3)) if (mins >= LONG_REST) n.dataset.rest = restLabel(mins) else delete n.dataset.rest } } type Head = { day: string; time: string } /** Running head: the day of the first message in view, once that day's divider has scrolled away above it. */ function readHead(scroller: HTMLElement, headHeight: number): Head | null { const top = scroller.getBoundingClientRect().top + headHeight let day: string | null = null for (const n of Array.from(scroller.children)) { if (!(n instanceof HTMLElement)) continue const isDay = n.matches('[data-slot="thread-day"]') if (n.getBoundingClientRect().bottom > top) { if (isDay || day === null) return null // the divider is in view and says it itself return { day, time: n.querySelector("time")?.textContent ?? "" } } if (isDay) day = n.textContent ?? "" } return null } /** * A message scroller. Give it a height. It keeps to the latest message while you are at the end; scrolled back * to read, it stays where you are and counts what arrives in a pill you can press to go down. * The messages are its direct children. The scroller takes focus, so the keyboard can scroll it. */ function Thread({ label, newLabel = "new", variant = "default", className, children, ...props }: ThreadProps) { const scroller = React.useRef(null) const counter = React.useRef(null) const headEl = React.useRef(null) const headDay = React.useRef(null) const [head, setHead] = React.useState(null) // Whether the reader was at the end before anything arrived: the scroll position after it arrives can't say. const atEnd = React.useRef(true) const unread = React.useRef(0) const [shown, setShown] = React.useState(0) React.useEffect(() => { const el = scroller.current if (!el) return const toEnd = (behavior: ScrollBehavior = "auto") => el.scrollTo({ top: el.scrollHeight, behavior }) // The running head rolls its day word, forward when a later day comes up, back when an earlier one does. let shownHead: Head | null = null const updateHead = () => { if (variant !== "running") return const next = readHead(el, headEl.current?.offsetHeight ?? 0) if (next?.day === shownHead?.day && next?.time === shownHead?.time) return const turn = next && shownHead && next.day !== shownHead.day && headDay.current const later = turn && !!shownHead && el.scrollTop > lastTop shownHead = next if (turn) roll(turn, () => setHead(next), "0.5em", later ? 1 : -1) else setHead(next) } let lastTop = el.scrollTop if (variant === "rests") measureRests(el) toEnd() updateHead() const onScroll = () => { updateHead() lastTop = el.scrollTop atEnd.current = el.scrollHeight - el.scrollTop - el.clientHeight < NEAR if (atEnd.current && unread.current) { unread.current = 0 setShown(0) } } // ponytail: following is instant; smooth-scrolling to each arrival would fight the reader's own scrolling. const watch = new MutationObserver((records) => { if (variant === "rests") measureRests(el) let theirs = 0 let yours = false for (const r of records) if (r.target === el) r.addedNodes.forEach((n) => { if (!(n instanceof HTMLElement && n.matches('[data-slot="message"]'))) return if (n.dataset.from === "you") yours = true else theirs++ }) if (atEnd.current || yours) { toEnd() // what you send takes you down; a reply being written in is followed too return updateHead() } if (!theirs) return const next = (unread.current += theirs) if (counter.current) roll(counter.current, () => setShown(next), "0.5em") else setShown(next) }) watch.observe(el, { childList: true, subtree: true, characterData: true }) el.addEventListener("scroll", onScroll, { passive: true }) return () => { watch.disconnect() el.removeEventListener("scroll", onScroll) } }, [variant]) const jump = () => { const reduced = matchMedia("(prefers-reduced-motion: reduce)").matches scroller.current?.focus({ preventScroll: true }) scroller.current?.scrollTo({ top: scroller.current.scrollHeight, behavior: reduced ? "auto" : "smooth" }) } return (

{children}

{variant === "running" && ( // The log already says every day and time; the head repeats them for the eye. )} {shown > 0 && ( )}

) } /** Where a day begins: a word with a rule drawn out to each side. */ function ThreadDay(props: Omit) { return } export { Thread, ThreadDay, type ThreadProps } 55:Tdf2,@layer components { /* ── ot-thread ── message scroller: it keeps to the latest; scrolled back, it counts what's new. Give .ot-thread a height (26rem here). It borrows ot-scroll (edge rules), ot-msg and ot-marker. */ .ot-thread { position: relative; display: grid; grid-template-rows: minmax(0, 1fr); height: 26rem; } .ot-thread-scroll { display: grid; align-content: safe end; gap: var(--ot-space-6); padding-block: var(--ot-space-5); padding-inline-end: var(--ot-space-3); } .ot-thread-latest { position: absolute; inset-block-end: var(--ot-space-4); inset-inline: 0; margin-inline: auto; width: fit-content; display: inline-flex; align-items: baseline; gap: 0.35em; appearance: none; border: 0; margin-block: 0; padding: 0.3em 0.95em 0.36em; border-radius: 1em; background: var(--ot-ink); color: var(--ot-paper); font: 500 var(--ot-pp) / var(--ot-pp-lh) var(--ot-voice); cursor: pointer; animation: ot-land var(--ot-moderato) var(--ot-spiccato); } .ot-thread-new { display: inline-block; font-variant-numeric: tabular-nums; } /* ── rests ── the space between two messages is the silence between them: its gap grows with the log of the minutes (script sets --ot-rest). A pause of an hour or more is said in that silence the way the marker's lapse says it: "3 hours later", in pencil, centred, its letters spread by how long it went quiet (--ot-lapse, the lapse's scale). */ .ot-thread[data-variant="rests"] .ot-thread-scroll { gap: var(--ot-space-3); } .ot-thread[data-variant="rests"] .ot-thread-scroll > .ot-msg { --ot-rest-gap: min(var(--ot-space-9), calc(var(--ot-rest, 0) * var(--ot-space-2) * 1.25)); position: relative; margin-block-start: var(--ot-rest-gap); } .ot-thread[data-variant="rests"] .ot-thread-scroll > [data-slot="thread-day"] { margin-block: var(--ot-space-5); } .ot-thread[data-variant="rests"] .ot-msg[data-rest]::after { --ot-rest-tr: calc(var(--ot-pp-tr) + var(--ot-lapse, 0) * 0.36em); content: attr(data-rest) / ""; position: absolute; inset-inline: 0; margin-inline: auto; width: fit-content; pointer-events: none; inset-block-start: calc((var(--ot-rest-gap) + var(--ot-space-3)) / -2); translate: 0 -50%; font: 400 var(--ot-pp) / 1 var(--ot-voice); letter-spacing: var(--ot-rest-tr); padding-inline-start: var(--ot-rest-tr); white-space: nowrap; color: var(--ot-pencil); direction: ltr; unicode-bidi: isolate; /* the words are the library's English */ } /* ── running ── scrolled back, the top edge carries the day you are in and the time of the first message in view, on a hairline between them (the SHAPES / GRADIENTS frame row). Its day rolls as the days change. */ .ot-thread-head { position: absolute; inset-block-start: 0; inset-inline: 0 var(--ot-space-4); z-index: 1; margin: 0; display: flex; align-items: center; gap: var(--ot-space-3); padding-block: var(--ot-space-2); background: var(--ot-paper); font-size: var(--ot-pp); line-height: var(--ot-pp-lh); color: var(--ot-graphite); transition: opacity var(--ot-moderato) var(--ot-exhale); } .ot-thread-head:not([data-shown]) { opacity: 0; visibility: hidden; } .ot-thread-head > span { display: inline-block; } .ot-thread-head::after { content: ""; order: 1; flex: 1; height: var(--ot-hairline); background: var(--ot-rule-strong); } .ot-thread-head > time { order: 2; color: var(--ot-pencil); font-variant-numeric: tabular-nums; } @media (forced-colors: active) { .ot-thread-head::after { background: CanvasText; } } } 4f:["$","div",null,{"className":"mt-3 flex min-h-0 min-w-0 flex-1 flex-col gap-3","children":[["$","div",null,{"className":"flex shrink-0 items-start gap-3","children":[["$","div",null,{"className":"flex max-h-28 min-w-0 flex-1 flex-wrap items-center gap-2 overflow-y-auto","children":[null,["$","$L50",null,{"namespace":"@0nlytype","registryDependencies":["https://thedirectors.agency/ui/r/0nlytype.json","https://thedirectors.agency/ui/r/marker.json","https://thedirectors.agency/ui/r/scroll-area.json","https://thedirectors.agency/ui/r/scrollbar.json"]}]]}],["$","$L51",null,{"children":["$","div",null,{"className":"@container","children":["$","div",null,{"className":"grid grid-cols-1 gap-4 @xl:grid-cols-2","children":[null,null,null,["$","div",null,{"className":"flex flex-col border rounded-md","children":[["$","p",null,{"className":"text-sm font-medium border-b p-2","children":"CSS"}],["$","div",null,{"children":["$","$L52",null,{"lang":"css","copyButton":true,"writing":false,"className":"rounded-none w-full max-h-80","header":false,"children":"@import \"../styles/0nlytype/thread.css\" {\n\n}"}]}]]}]]}]}]}]]}],["$","$L53",null,{"files":[{"path":"registry/0nlytype/ui/thread.tsx","content":"$54","type":"registry:ui"},{"path":"registry/0nlytype/styles/thread.css","content":"$55","type":"registry:file","target":"styles/0nlytype/thread.css"}],"className":"h-[70svh] min-h-80"}]]}]