63:I[707087,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/04j_o97cgxn2x.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/1bpgyrs5qflhu.js","/_next/static/immutable/chunks/0-6vu2ul1h6ld.js","/_next/static/immutable/chunks/43_s7jweyypoh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1lo-zn37dolb5.js","/_next/static/immutable/chunks/1v8k6yxw1rg0u.js"],"RegistryDependencies"] 64:I[314491,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/04j_o97cgxn2x.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/1bpgyrs5qflhu.js","/_next/static/immutable/chunks/0-6vu2ul1h6ld.js","/_next/static/immutable/chunks/43_s7jweyypoh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1lo-zn37dolb5.js","/_next/static/immutable/chunks/1v8k6yxw1rg0u.js"],"FilesView"] 65:T559e,// Channel Thread · snapcn — https://snapcn.dev/docs/text/channel-thread "use client"; import { loadFont as loadSans } from "@remotion/google-fonts/Barlow"; import type { CSSProperties } from "react"; import { useCallback, useState } from "react"; import { AbsoluteFill, continueRender, delayRender, getRemotionEnvironment, staticFile, useCurrentFrame, useVideoConfig, } from "remotion"; import { Item, mixOklch, resolveFont, type SnapCnTheme, useSnapCnTheme, withAlpha, } from "@/lib/snap-cn-ui"; /** * A work chat filling itself in, the way the channel actually reads. * * Not bubbles: a transcript. An avatar, a name in bold, a quiet timestamp, and * the messages under them as plain lines — the shape every team tool has * settled on. Messages land one at a time; a second message from the same * person joins the group without repeating the name; and when somebody new * starts typing, three dots hold their line until the words arrive. The * transcript never creeps: it sits perfectly still between arrivals and then * scrolls, once, by exactly the room the new line needs. * * ## The layout came off a recording and it closes to the pixel * * Four numbers describe every vertical position in the scene, measured on a * 638 × 354 capture by thresholding the ink of eighty frames: * * name → its first message 37.59 * message → message 46.01 * last message → next name 69.00 * first message, before any scroll, at 158.90 * * That is not a model fitted to the frames, it is *checked* against them. Take * the first message's start, add the two arrivals' scroll (46.01 + 2 × 46.01), * and the oldest line lands at 20.87; the recording's last frame has it at 21. * Carry the same arithmetic down to the newest name and it predicts 138.9 where * the recording measures 139.00. Nine tenths of a pixel over a whole scene. * * ## The scroll is an event, not a drift * * Between arrivals the transcript is *byte-identical* frame to frame — the * measured movement is 0.00px for twenty-nine frames at the head of the clip and * for another eight in the middle. Everything that looks like life comes from * the arrivals themselves. `SCROLL` is one of those moves, measured: it * accelerates for four frames, peaks at 5.1px, and then spends three quarters of * a second arriving. * * A caveat, because it is measured and it is not reproduced: the recording's * two-row scroll runs about 1.6× faster in normalised time than its one-row * scroll — a longer move that takes *less* time, which is a browser's native * smooth-scroll heuristic and not something a scene should imitate. One curve * ships, taken from the one-row move, and a two-row move simply travels twice * as far along it. */ const { fontFamily: SANS } = loadSans("normal", { weights: ["400", "500", "600", "700"], subsets: ["latin"], }); /* ───────────────────────────────────────────────────────────────────────── The transcript, in the recording's own 638 × 354 pixels ───────────────────────────────────────────────────────────────────────── */ export const REF_W = 638; export const REF_H = 354; /** Baseline of a group's first message, below the name. */ export const NAME_GAP = 37.59; /** Baseline to baseline, within a group. */ export const MSG_GAP = 46.01; /** Last message of a group to the next group's name. */ export const GROUP_GAP = 69; /** Where the oldest message sits before anything has arrived. */ export const START_Y = 158.9; /** * The line the newest message rests on, and the whole reason the transcript is * still between arrivals. * * It does not scroll on every message — the recording's second message lands * with the stack measurably motionless, 0.00px for twenty-nine frames. It * scrolls only by however far the newest baseline would fall *past* this line, * which is zero until the thread is tall enough to reach it. One constant * replaces a per-message "does this one scroll" flag, and it is what makes the * arithmetic close: 158.90 + 46.01 is above it and moves nothing; the next two * rows put the newest baseline at 311.50 and the scroll settles at exactly * 92.02, which is what the recording measures. */ export const ANCHOR = 219.48; /** The avatar is square, and its top sits this far above the name's baseline. */ export const AVATAR = 70; export const AVATAR_X = 119.5; export const AVATAR_RISE = 28; /** Left of the text column's box. Ink starts at 201.1 (name) and 202.4 (body). */ export const TEXT_X = 202; /** Body type. Cap height measured at 22.40px. */ export const SIZE = 31.2; /** The timestamp, measured on its digits: cap 18.09. */ export const TIME_SIZE = 24.9; /** Box top → baseline at `lineHeight: 1`. A face metric, measured, not guessed. */ export const ASC = 28.95; /** Typing dots: on the line the message will take, a little above its baseline. */ export const DOT = 5; export const DOT_GAP = 8.4; export const DOT_RISE = 5.7; /** A dot every this many seconds, then the ellipsis starts over. */ export const DOT_BEAT = 0.1; /** * Frames between a group's row opening and the group appearing in it. * * The room is made first and the person arrives into it: the recording starts * scrolling on frame 37 and does not paint the avatar, the name or the first * dot until frame 40. Three frames is nothing to watch and everything to match, * and it is also what the dots are timed from — anchor their cycle to the scroll * instead and the ellipsis is a step out of phase for its whole life. */ export const LEAD = 3; /** * One arrival's scroll, as (seconds since it started, share of the travel). * * Recovered by correlating each frame's vertical ink profile against the last — * which reads the move off every visible row at once rather than tracking one * word — and checked against the absolute baseline of the bold name row, which * agrees to a third of a pixel. */ export const SCROLL: readonly (readonly [number, number])[] = [ [0, 0], [0.0167, 0.004], [0.05, 0.016], [0.0833, 0.044], [0.1167, 0.093], [0.15, 0.178], [0.1833, 0.289], [0.2167, 0.398], [0.25, 0.486], [0.2833, 0.557], [0.3167, 0.616], [0.35, 0.663], [0.3833, 0.702], [0.4167, 0.737], [0.45, 0.767], [0.4833, 0.791], [0.5167, 0.814], [0.55, 0.834], [0.5833, 0.852], [0.6167, 0.867], [0.65, 0.881], [0.6917, 0.893], [0.7167, 0.903], [0.75, 0.912], [0.7833, 0.919], [1.1, 1], ]; /** * How far a line is faded, by its height in the frame. * * Read as an envelope over the whole clip: the brightest any pixel of a line * ever got at each height. Taking the maximum across every frame is what makes * it a property of the *position* — one sample would have read a line with no * ascenders as a dip in the gradient. * * It stops at a tenth rather than at nothing: the oldest line is cut off by the * frame, not erased by the fade. */ export const FADE: readonly (readonly [number, number])[] = [ [10, 0.098], [25, 0.125], [40, 0.149], [55, 0.216], [70, 0.357], [85, 0.518], [100, 0.651], [115, 0.843], [140, 0.98], [175, 1], ]; type Table = readonly (readonly [number, number])[]; /** Linear read of a rising table, clamped at both ends. */ export function read(table: Table, x: number): number { const first = table[0]; const last = table[table.length - 1]; if (!first || !last) return 0; if (x <= first[0]) return first[1]; if (x >= last[0]) return last[1]; for (let i = 1; i < table.length; i++) { const hi = table[i]; const lo = table[i - 1]; if (hi && lo && x <= hi[0]) { return lo[1] + ((hi[1] - lo[1]) * (x - lo[0])) / (hi[0] - lo[0]); } } return last[1]; } interface Line { /** Baseline in transcript space, before any scroll. */ y: number; /** Baseline of this group's name row, when this line heads a group. */ nameY: number; group: number; /** First line of a group, i.e. the one the name and avatar belong to. */ head: boolean; text: string; /** Frame the words land on. The row itself opens at `opens`. */ at: number; opens: number; } /** * Lay the transcript out once, in transcript space. * * Positions are absolute and never re-flow: the scroll is a single translate * over the top of them. That is what lets every arrival be a number rather than * a layout pass, and it is why the stack can be perfectly still between them. */ export function layout( groups: { person: string; time: string; lines: string[] }[], ): Line[] { const out: Line[] = []; let last = START_Y - NAME_GAP; let first = true; for (let g = 0; g < groups.length; g++) { const group = groups[g]; if (!group) continue; for (let m = 0; m < group.lines.length; m++) { const head = m === 0; const nameY = head ? (first ? last : last + GROUP_GAP) : 0; const y = head ? nameY + NAME_GAP : last + MSG_GAP; out.push({ y, nameY, group: g, head, text: group.lines[m] ?? "", at: 0, opens: 0, }); last = y; first = false; } } return out; } /** * One message. A message with the same author, time and avatar as the one * above it joins that group, under one name, the way the channel reads. */ export interface ThreadMessage { text: string; author?: string; time?: string; avatar?: string; /** Frame the words land on. Default: the measured 0, 12, 60, 84, then every 24. */ at?: number; /** * Frame the row opens on, before the words land — typing dots, if it starts * a group. Default: the measured 0, 12, 37, 72, then every 24. */ opens?: number; } export const DEFAULT_MESSAGES: readonly ThreadMessage[] = [ ["rhea", "9:41 AM", "07", "Launch video by Thursday?"], ["rhea", "9:41 AM", "07", "We have nothing shot."], ["sam", "9:42 AM", "13", "Already done."], ["sam", "9:42 AM", "13", "Built it out of snapcn."], ].map(([author, time, face, text]) => ({ author, time, avatar: `/avatars/${face}.jpg`, text: text ?? "", })); /** The recording's four arrivals; after them, a message every 24 frames. */ const BEATS = [0, 12, 60, 84]; const OPENS = [0, 12, 37, 72]; /** * The string form of `messages`, for the customizer and for quick edits: * messages split by `|`, each `avatar > name time > text`. The name runs to * the first space. A message that is only text continues the one above it. * * "/avatars/07.jpg > rhea 9:41 AM > Launch video? | Nothing shot." */ export function toMessages( input: readonly ThreadMessage[] | string, ): readonly ThreadMessage[] { if (typeof input !== "string") return input; let head = { author: "", time: "", avatar: "" }; return input .split("|") .filter((m) => m.trim()) .map((m) => { const parts = m.split(">").map((v) => v.trim()); const text = parts.pop() ?? ""; const who = parts.pop(); if (who !== undefined) { const cut = who.indexOf(" "); head = { author: cut < 0 ? who : who.slice(0, cut), time: cut < 0 ? "" : who.slice(cut + 1), avatar: parts.pop() ?? "", }; } return { ...head, text }; }); } export interface ChannelThreadProps { /** The conversation, in order. Also takes the string form: see `toMessages`. */ messages?: readonly ThreadMessage[] | string; theme?: Partial; mode?: "light" | "dark"; fontFamily?: string; } export function ChannelThread({ messages = DEFAULT_MESSAGES, theme, mode = "dark", fontFamily = "Default", }: ChannelThreadProps) { const frame = useCurrentFrame(); const { fps, width, height } = useVideoConfig(); const t = useSnapCnTheme(theme, mode); const face = resolveFont(fontFamily) ?? SANS; const u = height / REF_H; const ox = (width - REF_W * u) / 2; const now = frame / fps; const said = toMessages(messages).filter((m) => m.text.trim()); const groups: { person: string; time: string; avatar: string; lines: string[]; }[] = []; for (const m of said) { const [person = "", time = "", avatar = ""] = [m.author, m.time, m.avatar]; const g = groups[groups.length - 1]; if (g && g.person === person && g.time === time && g.avatar === avatar) { g.lines.push(m.text.trim()); } else { groups.push({ person, time, avatar, lines: [m.text.trim()] }); } } const lines = layout(groups); lines.forEach((l, i) => { const m = said[i]; l.at = m?.at ?? BEATS[i] ?? 84 + 24 * (i - 3); l.opens = i === 0 ? Number.NEGATIVE_INFINITY : (m?.opens ?? OPENS[i] ?? 72 + 24 * (i - 3)); }); // Each opened row moves the target to however far its baseline falls past the // anchor. A row that does not reach the anchor moves nothing, which is the // stillness in the reference rather than an exception carved out for it. let scroll = 0; let target = 0; for (const l of lines) { const want = Math.max(0, l.y - ANCHOR); const step = want - target; target = want; if (step <= 0) continue; // A longer move takes *less* time, not more — measured, twice: the two-row // scroll runs 1.60× faster in normalised time than the one-row scroll, which // is what a browser's native smooth scroll does with distance and what the // recording therefore does. One curve, read faster the further it has to go. const rate = (step / MSG_GAP) ** 0.68; scroll += step * read(SCROLL, (now - l.opens / fps) * rate); } const ink = t.foreground; const dim = t.mutedForeground; return (

{lines.map((l, i) => { const y = l.y - scroll; if (y < -MSG_GAP || y > REF_H + MSG_GAP) return null; const shown = frame >= l.at; if (frame < l.opens) return null; const arrived = frame >= l.opens + LEAD; const g = groups[l.group]; const nameA = read(FADE, y - NAME_GAP); const bodyA = read(FADE, y); return (

{l.head && g && arrived && ( <>

{g.person} {g.time}

)} {shown ? ( // The message is the object Studio selects: its body line, by // its index across the whole conversation.

{l.text}

) : ( l.head && arrived && ( ) )}

); })}

); } /** Three dots that arrive one at a time, then start over. */ function Dots({ y, u, colour, since, alpha, }: { y: number; u: number; colour: string; since: number; alpha: number; }) { const step = Math.floor((since % (DOT_BEAT * 4)) / DOT_BEAT); return ( <> {[0, 1, 2].map((i) => (

))} ); } /** * A root-relative asset is a `public/` file. Only the site's own Player serves * it at that path; Remotion Studio and a render know its URL through * `staticFile()` alone — so every environment but the Player rewrites it. */ function resolveSrc(src: string): string { const isLocal = src.startsWith("/") && !src.startsWith("//"); if (!isLocal || getRemotionEnvironment().isPlayer) return src; // A value that already came out of staticFile() carries the static base // (`/static-/…`); running it through again would prefix it twice. const base = staticFile("_").slice(0, -2); if (base && src.startsWith(`${base}/`)) return src; try { return staticFile(src.replace(/^\/+/, "")); } catch { return src; } } /** * An avatar that holds the render until it has actually loaded. * * Without this a frame can be captured before the picture arrives and the * square comes out empty — invisible in the Player, where an image simply * appears, and silent in an mp4 until somebody watches it. Remotion's own `Img` * is avoided for the reason `hero-launch` documents: it awaits `decode()`, which * the headless compositor rejects for some progressive JPEGs and hangs the * export. `onError` releases too, so a bad source degrades to a missing picture * rather than a stuck render. */ function Face({ src, style }: { src: string; style: CSSProperties }) { const [handle] = useState(() => delayRender(`channel avatar: ${src}`)); const release = useCallback(() => continueRender(handle), [handle]); return ( // biome-ignore lint/performance/noImgElement: Remotion frame, not a Next route. hangs on some JPEGs src={resolveSrc(src)} alt="" // Tailwind's preflight sets `img { max-width: 100% }`, which collapses an // image inside a shrink-to-fit box to zero pixels wide on the site while // rendering perfectly in an mp4. Size it here and say so. style={{ ...style, maxWidth: "none" }} onLoad={release} onError={release} /> ); } /** The person's picture, or their initial on a tinted square when there is none. */ function Avatar({ src, name, y, u, t, alpha, }: { src: string; name: string; y: number; u: number; t: SnapCnTheme; alpha: number; }) { const box = { position: "absolute" as const, left: AVATAR_X * u, top: y, width: AVATAR * u, height: AVATAR * u, borderRadius: 8 * u, overflow: "hidden" as const, opacity: alpha, }; if (src) return ; return (

{name.slice(0, 1).toUpperCase()}

); } 62:["$","div",null,{"className":"mt-3 flex min-h-0 min-w-0 flex-1 flex-col gap-3","children":[["$","div",null,{"className":"flex shrink-0 items-start gap-3","children":[["$","div",null,{"className":"flex max-h-28 min-w-0 flex-1 flex-wrap items-center gap-2 overflow-y-auto","children":[["$","ul",null,{"className":"flex min-w-0 flex-wrap gap-2","aria-label":"Package dependencies","children":[["$","li","remotion",{"className":"min-w-0 max-w-full","children":["$","a",null,{"href":"https://www.npmjs.com/package/remotion","target":"_blank","rel":"noopener noreferrer","className":"flex max-w-full min-w-0 items-center gap-1.5 rounded-md border px-2 py-1.5 text-xs","children":[["$","svg",null,{"viewBox":"0 0 24 24","className":"size-3 shrink-0","children":["$","path",null,{"d":"M1.763 0C.786 0 0 .786 0 1.763v20.474C0 23.214.786 24 1.763 24h20.474c.977 0 1.763-.786 1.763-1.763V1.763C24 .786 23.214 0 22.237 0zM5.13 5.323l13.837.019-.009 13.836h-3.464l.01-10.382h-3.456L12.04 19.17H5.113z","fill":"currentColor"}]}],["$","span",null,{"className":"min-w-0 break-all text-xs font-medium","children":"remotion"}]]}]}],["$","li","@remotion/google-fonts",{"className":"min-w-0 max-w-full","children":["$","a",null,{"href":"https://www.npmjs.com/package/%40remotion%2Fgoogle-fonts","target":"_blank","rel":"noopener noreferrer","className":"flex max-w-full min-w-0 items-center gap-1.5 rounded-md border px-2 py-1.5 text-xs","children":[["$","svg",null,{"viewBox":"0 0 24 24","className":"size-3 shrink-0","children":["$","path",null,{"d":"M1.763 0C.786 0 0 .786 0 1.763v20.474C0 23.214.786 24 1.763 24h20.474c.977 0 1.763-.786 1.763-1.763V1.763C24 .786 23.214 0 22.237 0zM5.13 5.323l13.837.019-.009 13.836h-3.464l.01-10.382h-3.456L12.04 19.17H5.113z","fill":"currentColor"}]}],["$","span",null,{"className":"min-w-0 break-all text-xs font-medium","children":"@remotion/google-fonts"}]]}]}]]}],["$","$L63",null,{"namespace":"@registrydirectory","registryDependencies":["https://snapcn.dev/r/snap-cn-ui.json"]}]]}],null]}],["$","$L64",null,{"files":[{"path":"registry/snap-cn/channel-thread/index.tsx","content":"$65","type":"registry:component","target":"components/snap-cn/channel-thread.tsx"}],"className":"h-[70svh] min-h-80"}]]}]