{ setStatus("Message sent"); window.setTimeout(() => throwRef.current?.reset(), 1800); }} />

{rows.length === 0 ? (

Inbox zero

) : (

{rows.map((m, i) => { const leading: ThrowAction = { label: "Archive", icon: ARCHIVE, color: "#0369a1", onAction: () => remove(m.id, "Archived", m.from), }; const trailing: ThrowAction[] = [ { label: "Delete", icon: TRASH, color: "#be123c", onAction: () => remove(m.id, "Deleted", m.from) }, { label: flagged.includes(m.id) ? "Unflag" : "Flag", icon: FLAG, color: "#3f3f46", onAction: () => setFlagged((f) => (f.includes(m.id) ? f.filter((x) => x !== m.id) : [...f, m.id])), }, ]; return (

0 ? "border-t border-white/[0.06]" : undefined} >

{m.initials} {m.from} {flagged.includes(m.id) && ( )} {m.time} {m.subject} {m.preview}

); })}

)}

Slide to commit — swipe a row.

{status}

); } ``` ## Accessibility & performance Honors `prefers-reduced-motion` with a designed static frame or fade (never a blank box) and passes `className` through. ## Source (`throw.tsx`) ```tsx "use client"; import { AnimatePresence, animate, motion, useInView, useMotionValue, useMotionValueEvent, useTransform, type AnimationPlaybackControls, } from "motion/react"; import * as React from "react"; import { cn } from "@/lib/utils"; import { useReducedMotion } from "@/hooks/use-reduced-motion"; /* -------------------------------------------------------------------------- */ /* shared */ /* -------------------------------------------------------------------------- */ const clamp = (v: number, lo: number, hi: number) => Math.min(hi, Math.max(lo, v)); /** Picks a legible ink (near-black or white) for text drawn on `hex`. */ function inkOn(color: string): string { const m = /^#?([0-9a-f]{3}|[0-9a-f]{6})$/i.exec(color.trim()); if (!m) return "#0a0a0a"; let h = m[1]; if (h.length === 3) h = h.replace(/./g, (c) => c + c); const lin = (i: number) => { const c = parseInt(h.slice(i, i + 2), 16) / 255; return c <= 0.03928 ? c / 12.92 : ((c + 0.055) / 1.055) ** 2.4; }; const L = 0.2126 * lin(0) + 0.7152 * lin(2) + 0.0722 * lin(4); // Contrast against black vs white — whichever wins. return (L + 0.05) / 0.05 >= 1.05 / (L + 0.05) ? "#0a0a0a" : "#ffffff"; } const SPRING = { type: "spring", stiffness: 520, damping: 38, mass: 0.9 } as const; const SOFT = { type: "spring", stiffness: 300, damping: 30 } as const; const QUICK = { duration: 0.14, ease: "easeOut" } as const; /* -------------------------------------------------------------------------- */ /* Throw */ /* -------------------------------------------------------------------------- */ /** Imperative handle for {@link Throw}. */ export interface ThrowHandle { /** Return the knob to the start and clear the committed state. */ reset(): void; /** Move keyboard focus to the knob. */ focus(): void; } export interface ThrowProps { /** Instruction text inside the track; also the slider's accessible name. @default "Slide to confirm" */ label?: string; /** Text shown in the filled track once committed. @default "Done" */ committedLabel?: string; /** Fires once when the knob is thrown past the threshold (or Enter is pressed at the end). */ onCommit?: () => void; /** Fraction of the travel (0–1) the knob must pass on release to commit. @default 0.85 */ threshold?: number; /** Fill colour behind the knob and of the committed track. Any CSS colour; hex gets auto-contrast ink. @default "#f5f5f5" */ accentColor?: string; /** Disable dragging and keys. @default false */ disabled?: boolean; /** Idle hint — the knob nudges forward every few seconds until first touched. @default true */ hint?: boolean; /** Freeze the shimmer and idle hint. @default false */ paused?: boolean; className?: string; /** Imperative handle — `{ reset(), focus() }`. */ ref?: React.Ref; } const KNOB = 48; const PAD = 4; /** * Throw — a slide-to-commit track. Drag the knob (or use the arrow keys) to the * end: past `threshold` on release it snaps home and commits, the track floods * with the accent, the knob turns into a check. Released early it springs back. * The instruction label shimmers and fades as the knob passes over it. * * Accessibility: the knob is a `role="slider"` (0–100, with valuetext); * Arrow/PageUp/PageDown/Home/End move it and Enter or Space commits once it sits * at 100%. Reduced motion drops the shimmer, springs and idle hint. */ export function Throw({ label = "Slide to confirm", committedLabel = "Done", onCommit, threshold = 0.85, accentColor = "#f5f5f5", disabled = false, hint = true, paused = false, className, ref, }: ThrowProps) { const reduced = useReducedMotion(); const still = reduced || paused; const trackRef = React.useRef(null); const knobRef = React.useRef(null); const inView = useInView(trackRef, { amount: 0.4 }); const descId = React.useId(); const x = useMotionValue(0); const max = useMotionValue(0); const progress = useTransform([x, max], ([a, b]: number[]) => (b > 0 ? clamp(a / b, 0, 1) : 0)); const fillW = useTransform(x, (v) => v + KNOB); const labelOpacity = useTransform(progress, [0, 0.55], [1, 0]); const labelShift = useTransform(progress, [0, 1], [0, 18]); const [committed, setCommitted] = React.useState(false); const [pct, setPct] = React.useState(0); const [dragging, setDragging] = React.useState(false); const [armed, setArmed] = React.useState(false); const [flash, setFlash] = React.useState(0); const anim = React.useRef(null); const touched = React.useRef(false); const drag = React.useRef<{ id: number; sx: number; start: number } | null>(null); const committedRef = React.useRef(false); const onCommitRef = React.useRef(onCommit); React.useEffect(() => { onCommitRef.current = onCommit; }); const run = React.useCallback( (to: number | number[], t: object) => { anim.current?.stop(); anim.current = animate(x, to as number, t); }, [x] ); // Track width → travel. A committed knob stays pinned to the end on resize. React.useLayoutEffect(() => { const el = trackRef.current; if (!el) return; const measure = () => { const m = Math.max(0, el.clientWidth - KNOB - PAD * 2); max.set(m); if (committedRef.current) x.set(m); }; measure(); const ro = new ResizeObserver(measure); ro.observe(el); return () => ro.disconnect(); }, [max, x]); useMotionValueEvent(progress, "change", (p) => { if (drag.current) setArmed(p >= threshold); }); const commit = React.useCallback(() => { if (committedRef.current) return; committedRef.current = true; touched.current = true; setCommitted(true); setArmed(false); setPct(100); setFlash((n) => n + 1); run(max.get(), still ? QUICK : SOFT); onCommitRef.current?.(); }, [max, run, still]); const goTo = React.useCallback( (p: number) => { const next = clamp(p, 0, 1); setPct(Math.round(next * 100)); run(next * max.get(), still ? QUICK : SPRING); }, [max, run, still] ); const reset = React.useCallback(() => { committedRef.current = false; setCommitted(false); setArmed(false); setPct(0); run(0, still ? QUICK : SOFT); }, [run, still]); React.useImperativeHandle( ref, () => ({ reset, focus: () => knobRef.current?.focus() }), [reset] ); // Idle hint: a seeded-cadence nudge that teaches the gesture. Also serves as // the designed intro (first nudge lands shortly after the track enters view). React.useEffect(() => { if (!hint || still || disabled || committed || !inView) return; let timer = 0; const tease = () => { const el = knobRef.current; if ( touched.current || committedRef.current || drag.current || (el && document.activeElement === el) ) return; const m = max.get(); run([0, m * 0.24, 0], { duration: 1.15, times: [0, 0.38, 1], ease: ["easeOut", [0.5, 0, 0.2, 1]] }); timer = window.setTimeout(tease, 4200); }; timer = window.setTimeout(tease, 700); return () => window.clearTimeout(timer); }, [hint, still, disabled, committed, inView, max, run]); React.useEffect(() => () => anim.current?.stop(), []); /* ------------------------------- pointer -------------------------------- */ const onPointerDown = (e: React.PointerEvent) => { if (disabled || committedRef.current || e.button !== 0) return; e.preventDefault(); touched.current = true; anim.current?.stop(); e.currentTarget.setPointerCapture(e.pointerId); e.currentTarget.focus({ preventScroll: true }); drag.current = { id: e.pointerId, sx: e.clientX, start: x.get() }; setDragging(true); }; const onPointerMove = (e: React.PointerEvent) => { const d = drag.current; if (!d || d.id !== e.pointerId) return; const m = max.get(); const nx = clamp(d.start + e.clientX - d.sx, 0, m); x.set(nx); setPct(m > 0 ? Math.round((nx / m) * 100) : 0); }; const endDrag = (e: React.PointerEvent) => { const d = drag.current; if (!d || d.id !== e.pointerId) return; drag.current = null; setDragging(false); setArmed(false); if (progress.get() >= threshold) commit(); else goTo(0); }; /* ------------------------------ keyboard -------------------------------- */ const onKeyDown = (e: React.KeyboardEvent) => { if (disabled) return; if (committedRef.current) return; const p = pct / 100; const big = e.shiftKey ? 0.25 : 0.1; let next: number | null = null; switch (e.key) { case "ArrowRight": case "ArrowUp": next = p + big; break; case "ArrowLeft": case "ArrowDown": next = p - big; break; case "PageUp": next = p + 0.25; break; case "PageDown": next = p - 0.25; break; case "Home": next = 0; break; case "End": next = 1; break; case "Enter": case " ": e.preventDefault(); if (pct >= 100) commit(); return; default: return; } e.preventDefault(); touched.current = true; goTo(next); }; // A half-thrown knob left by the keyboard slides home when focus leaves. const onBlur = () => { if (!committedRef.current && !drag.current && pct > 0) goTo(0); }; const valueText = committed ? committedLabel : pct >= 100 ? "At the end — press Enter to commit" : `${pct}%`; const ink = inkOn(accentColor); const tint = (a: number) => `color-mix(in srgb, ${accentColor} ${a}%, transparent)`; return (

{/* Instruction label — shimmers, then fades and drifts as the knob passes. */} {label} {/* Fill — trails the knob; floods solid on commit. */} {/* Committed label, inked for contrast on the accent. */} {committed && ( {committedLabel} )} {/* One-shot ring flash on commit. */} {!still && flash > 0 && ( )} {/* Knob — the slider itself. */} {committed ? ( ) : ( )} Drag the handle to the end, or use the arrow keys to reach 100% and press Enter. {committed ? committedLabel : ""}

); } /* -------------------------------------------------------------------------- */ /* ThrowRow */ /* -------------------------------------------------------------------------- */ /** One swipe action. The first action on a side is that side's primary. */ export interface ThrowAction { /** Visible caption and accessible name. */ label: string; /** Icon node (≈18px, uses `currentColor`). */ icon?: React.ReactNode; /** Background colour of the action well. @default "#404040" (primary) / "#262626" */ color?: string; /** Called when the action is chosen (after the row collapses, when it collapses). */ onAction: () => void; } type Side = "leading" | "trailing"; /** Imperative handle for {@link ThrowRow}. */ export interface ThrowRowHandle { /** Slide a side's actions into view. */ open(side: Side): void; /** Slide the row closed. */ close(): void; /** Un-collapse a row whose action has fired and close it. */ reset(): void; } export interface ThrowRowProps { /** Row content — the sliding foreground surface. */ children: React.ReactNode; /** Actions revealed by swiping right (they sit on the left edge). */ leading?: ThrowAction | ThrowAction[]; /** Actions revealed by swiping left (they sit on the right edge). */ trailing?: ThrowAction | ThrowAction[]; /** A swipe past 60% of the row fires that side's primary action. @default true */ fullSwipe?: boolean; /** Collapse the row (height spring) before firing an action. @default true */ collapseOnAction?: boolean; /** Idle hint — the row briefly peeks its trailing (else leading) actions until touched. @default false */ peek?: boolean; /** Accessible name for the row. Defaults to its text content. */ label?: string; /** Class for the outer wrapper. */ className?: string; /** Class for the sliding foreground surface. */ contentClassName?: string; /** Imperative handle — `{ open(side), close(), reset() }`. */ ref?: React.Ref; } const ACTION_W = 76; const FULL = 0.6; const asList = (a?: ThrowAction | ThrowAction[]) => (a ? (Array.isArray(a) ? a : [a]) : []); /** Exponential rubber band: grows quickly at first, saturates near `limit`. */ const rubber = (over: number, limit: number) => limit * (1 - Math.exp(-over / (limit * 1.6))); /** * ThrowRow — a list row that slides to reveal actions. Swipe left for trailing * actions, right for leading ones; travel past the actions is rubber-banded, * the icons scale in as they're uncovered, and a full swipe past 60% fires the * side's primary action: the row flies out and collapses on a height spring. * * Keyboard: the row is focusable; ArrowLeft / ArrowRight reveal actions and * move focus into them (Enter activates), Escape or the opposite arrow closes. * Reduced motion: no rubber band or springs — short tweens only. */ export function ThrowRow({ children, leading, trailing, fullSwipe = true, collapseOnAction = true, peek = false, label, className, contentClassName, ref, }: ThrowRowProps) { const reduced = useReducedMotion(); const lead = asList(leading); const trail = asList(trailing); const rootRef = React.useRef(null); const rowRef = React.useRef(null); const leadRef = React.useRef(null); const trailRef = React.useRef(null); const inView = useInView(rootRef, { amount: 0.6 }); const descId = React.useId(); const x = useMotionValue(0); const leadW = useTransform(x, (v) => Math.max(0, v)); const trailW = useTransform(x, (v) => Math.max(0, -v)); const leadIcon = useTransform(leadW, [0, ACTION_W * 0.9], [0.35, 1], { clamp: true }); const trailIcon = useTransform(trailW, [0, ACTION_W * 0.9], [0.35, 1], { clamp: true }); const leadOp = useTransform(leadW, [8, ACTION_W * 0.7], [0, 1], { clamp: true }); const trailOp = useTransform(trailW, [8, ACTION_W * 0.7], [0, 1], { clamp: true }); // Captions wait until each action has room for them (no cramped half-words). const leadN = useMotionValue(lead.length); const trailN = useMotionValue(trail.length); React.useEffect(() => { leadN.set(lead.length); trailN.set(trail.length); }, [lead.length, trail.length, leadN, trailN]); const cap = ([w, n]: number[]) => clamp((w / Math.max(1, n) - ACTION_W * 0.62) / (ACTION_W * 0.3), 0, 1); const leadCap = useTransform([leadW, leadN], cap); const trailCap = useTransform([trailW, trailN], cap); const [open, setOpen] = React.useState(null); const [armed, setArmed] = React.useState(null); const [firing, setFiring] = React.useState<{ side: Side; index: number } | null>(null); const [collapsed, setCollapsed] = React.useState(false); const anim = React.useRef(null); const touched = React.useRef(false); const dragged = React.useRef(false); const focusInto = React.useRef(null); const pending = React.useRef(null); const drag = React.useRef<{ id: number; sx: number; sy: number; start: number; decided: boolean; w: number; lx: number; lt: number; v: number; } | null>(null); const actionsFor = (s: Side) => (s === "leading" ? lead : trail); const sign = (s: Side) => (s === "leading" ? 1 : -1); const run = React.useCallback( (to: number | number[], t: object) => { anim.current?.stop(); anim.current = animate(x, to as number, t); }, [x] ); const close = React.useCallback(() => { setOpen(null); setArmed(null); run(0, reduced ? QUICK : SPRING); }, [reduced, run]); const openSide = React.useCallback( (s: Side) => { const n = (s === "leading" ? lead : trail).length; if (!n) return; setOpen(s); setArmed(null); run(sign(s) * n * ACTION_W, reduced ? QUICK : SPRING); }, // eslint-disable-next-line react-hooks/exhaustive-deps [lead.length, trail.length, reduced, run] ); const fire = (s: Side, index: number) => { const action = actionsFor(s)[index]; if (!action || firing) return; touched.current = true; setFiring({ side: s, index }); setArmed(null); if (!collapseOnAction) { action.onAction(); window.setTimeout(() => { setFiring(null); close(); }, reduced ? 60 : 220); return; } pending.current = action; const w = rowRef.current?.offsetWidth ?? 320; run(sign(s) * w, { ...(reduced ? QUICK : { duration: 0.24, ease: [0.4, 0, 0.6, 1] }), onComplete: () => setCollapsed(true), }); }; const reset = React.useCallback(() => { pending.current = null; setFiring(null); setCollapsed(false); setOpen(null); setArmed(null); anim.current?.stop(); x.set(0); }, [x]); React.useImperativeHandle(ref, () => ({ open: openSide, close, reset }), [openSide, close, reset]); // Focus the revealed panel's first action after a keyboard reveal. React.useEffect(() => { const s = focusInto.current; if (!s || open !== s) return; focusInto.current = null; (s === "leading" ? leadRef : trailRef).current?.querySelector("button")?.focus(); }, [open]); // Tap / press outside closes an open row. React.useEffect(() => { if (!open) return; const onDown = (e: PointerEvent) => { if (!rootRef.current?.contains(e.target as Node)) close(); }; document.addEventListener("pointerdown", onDown); return () => document.removeEventListener("pointerdown", onDown); }, [open, close]); // Idle peek — teaches that the row swipes. const peekSide: Side | null = trail.length ? "trailing" : lead.length ? "leading" : null; React.useEffect(() => { if (!peek || reduced || !inView || !peekSide || collapsed) return; let timer = 0; const go = () => { if (touched.current || drag.current || open || firing) return; const d = sign(peekSide) * ACTION_W * 0.85; run([0, d, d, 0], { duration: 1.6, times: [0, 0.3, 0.55, 1], ease: ["easeOut", "linear", [0.5, 0, 0.2, 1]] }); timer = window.setTimeout(go, 6000); }; timer = window.setTimeout(go, 1200); return () => window.clearTimeout(timer); }, [peek, reduced, inView, peekSide, collapsed, open, firing, run]); React.useEffect(() => () => anim.current?.stop(), []); /* ------------------------------- pointer -------------------------------- */ const shape = (raw: number, w: number) => { const s: Side = raw >= 0 ? "leading" : "trailing"; const n = actionsFor(s).length; const a = Math.abs(raw); if (!n) return reduced ? 0 : sign(s) * rubber(a, 28); const reach = fullSwipe ? w * 0.82 : n * ACTION_W; if (reduced) return sign(s) * Math.min(a, reach); return sign(s) * (a <= reach ? a : reach + rubber(a - reach, 40)); }; const onPointerDown = (e: React.PointerEvent) => { if (firing || e.button !== 0) return; anim.current?.stop(); dragged.current = false; drag.current = { id: e.pointerId, sx: e.clientX, sy: e.clientY, start: x.get(), decided: false, w: rowRef.current?.offsetWidth ?? 320, lx: e.clientX, lt: e.timeStamp, v: 0, }; }; const onPointerMove = (e: React.PointerEvent) => { const d = drag.current; if (!d || d.id !== e.pointerId) return; const dx = e.clientX - d.sx; const dy = e.clientY - d.sy; if (!d.decided) { if (Math.abs(dx) < 6 && Math.abs(dy) < 6) return; if (Math.abs(dy) > Math.abs(dx)) { drag.current = null; // vertical — let the page scroll return; } d.decided = true; dragged.current = true; touched.current = true; e.currentTarget.setPointerCapture(e.pointerId); } const dt = Math.max(1, e.timeStamp - d.lt); d.v = d.v * 0.6 + ((e.clientX - d.lx) / dt) * 1000 * 0.4; d.lx = e.clientX; d.lt = e.timeStamp; const nx = shape(d.start + dx, d.w); x.set(nx); const s: Side = nx >= 0 ? "leading" : "trailing"; const isArmed = fullSwipe && actionsFor(s).length > 0 && Math.abs(nx) > d.w * FULL; setArmed(isArmed ? s : null); }; const onPointerUp = (e: React.PointerEvent) => { const d = drag.current; if (!d || d.id !== e.pointerId) return; drag.current = null; if (!d.decided) return; const cur = x.get(); const s: Side = cur >= 0 ? "leading" : "trailing"; const n = actionsFor(s).length; const a = Math.abs(cur); const toward = Math.sign(d.v) === sign(s); if (n && fullSwipe && a > d.w * FULL) return fire(s, 0); if (n && ((a > (n * ACTION_W) / 2 && !(Math.abs(d.v) > 500 && !toward)) || (toward && Math.abs(d.v) > 500))) return openSide(s); close(); }; /* ------------------------------ keyboard -------------------------------- */ const onRowKey = (e: React.KeyboardEvent) => { if (e.target !== e.currentTarget || firing) return; if (e.key === "ArrowLeft" || e.key === "ArrowRight") { e.preventDefault(); touched.current = true; const s: Side = e.key === "ArrowLeft" ? "trailing" : "leading"; if (open && open !== s) return close(); if (!actionsFor(s).length) return; focusInto.current = s; if (open === s) { (s === "leading" ? leadRef : trailRef).current?.querySelector("button")?.focus(); focusInto.current = null; } else openSide(s); } else if (e.key === "Escape" && open) { e.preventDefault(); close(); } }; const onActionKey = (s: Side) => (e: React.KeyboardEvent) => { const closeKey = s === "trailing" ? "ArrowRight" : "ArrowLeft"; const buttons = Array.from( (s === "leading" ? leadRef : trailRef).current?.querySelectorAll("button") ?? [] ); const i = buttons.indexOf(e.currentTarget); if (e.key === "Escape") { e.preventDefault(); close(); rowRef.current?.focus(); } else if (e.key === closeKey) { e.preventDefault(); // Step back toward the content; past the first action, close. if (i > 0) buttons[i - 1].focus(); else { close(); rowRef.current?.focus(); } } else if (e.key === (s === "trailing" ? "ArrowLeft" : "ArrowRight")) { e.preventDefault(); buttons[i + 1]?.focus(); } }; /* -------------------------------- render -------------------------------- */ const panel = (s: Side) => { const acts = actionsFor(s); if (!acts.length) return null; const isLead = s === "leading"; const hot = firing?.side === s ? firing.index : armed === s ? 0 : -1; const visible = open === s; return ( = 0 ? (acts[hot].color ?? "#404040") : "#171717", transition: reduced ? "none" : "background 160ms ease", }} > {acts.map((a, i) => { const bg = a.color ?? (i === 0 ? "#404040" : "#262626"); const grow = hot < 0 ? 1 : hot === i ? 1 : 0; return ( ); })} ); }; const hasActions = lead.length + trail.length > 0; const hintText = [ trail.length ? `Left arrow: ${trail.map((a) => a.label).join(", ")}` : null, lead.length ? `Right arrow: ${lead.map((a) => a.label).join(", ")}` : null, ] .filter(Boolean) .join(". "); return ( { if (!collapsed || !pending.current) return; const a = pending.current; pending.current = null; a.onAction(); }} > {panel("leading")} {panel("trailing")} { if (dragged.current) { e.preventDefault(); e.stopPropagation(); dragged.current = false; } else if (open) { e.stopPropagation(); close(); } }} onKeyDown={onRowKey} className={cn( "relative z-10 touch-pan-y select-none bg-neutral-900 outline-none", "focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-white/60", contentClassName )} style={{ x }} > {children} {hasActions && ( {hintText}. Escape closes. )} ); } ```