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No bounce: a pill that overshoots its tab reads as imprecise. const SLIDE = { type: "spring", visualDuration: 0.3, bounce: 0 } as const; const INSTANT = { duration: 0 } as const; // Waits a beat for the tab to start widening, so the label fades into room // that is opening rather than being squeezed. const LABEL_IN = { duration: 0.2, delay: 0.05, ease: EASE_OUT }; const LABEL_OUT = { duration: 0.1, ease: EASE_OUT }; export function TabBar({ items, value, onChange, label, idBase, className, }: { items: readonly TabBarItem[]; value: string; onChange: (id: string) => void; label: string; // Lets the caller point tab panels back at their tabs. idBase: string; className?: string; }) { const reduce = useReducedMotion() ?? false; const refs = useRef(new Map()); const index = Math.max( items.findIndex((t) => t.id === value), 0, ); const layout = reduce ? INSTANT : SLIDE; return (

{ const target = { ArrowRight: index + 1, ArrowLeft: index - 1, Home: 0, End: items.length - 1, }[e.key]; if (target === undefined) return; e.preventDefault(); // Automatic activation, animated exactly like a tap. const next = items[(target + items.length) % items.length].id; onChange(next); refs.current.get(next)?.focus(); }} > {items.map((item) => { const active = item.id === items[index].id; return ( { if (el) refs.current.set(item.id, el); else refs.current.delete(item.id); }} type="button" role="tab" id={`${idBase}-tab-${item.id}`} aria-selected={active} aria-controls={active ? `${idBase}-panel-${item.id}` : undefined} aria-label={item.label} tabIndex={active ? 0 : -1} onClick={() => onChange(item.id)} layout // Only a change of tab moves anything, so unrelated renders // skip the measure. layoutDependency={value} transition={{ layout }} // Radius set in style so Motion can correct it while the // button's box is scaled mid-morph. style={{ borderRadius: 24 }} className={cn( "group relative flex h-12 touch-manipulation items-center overflow-hidden px-3 outline-hidden select-none focus-visible:outline-2 focus-visible:outline-solid focus-visible:outline-foreground", active ? "text-foreground" : "text-muted-foreground", "transition-[color] duration-150 ease-out", )} > {active && ( )} {/* Position-only, so the icon and label ride along with the morph without being stretched by it. */} {item.icon} {active && ( {item.label} )} ); })}

); } function Icon({ active, children, }: { active: boolean; children: React.ReactNode; }) { return ( {/* The fill floods out from the icon's middle and drains back in: a clip-path transition, so a quick second tap reverses it midway. */} ); } const ITEMS: TabBarItem[] = [ { id: "home", label: "Home", icon: ( ), }, { id: "search", label: "Search", icon: ( <> ), }, { id: "activity", label: "Activity", icon: ( <> ), }, { id: "profile", label: "Profile", icon: ( <> ), }, ]; const panel = { enter: (reduce: boolean) => ({ opacity: 0, y: reduce ? 0 : 6, filter: reduce ? "blur(0px)" : "blur(4px)", }), center: { opacity: 1, y: 0, filter: "blur(0px)", transition: { duration: 0.24, ease: EASE_OUT }, }, // Faster and without movement, so the outgoing screen never competes with // the incoming one. exit: { opacity: 0, y: 0, filter: "blur(0px)", transition: { duration: 0.12, ease: EASE_OUT }, }, }; function Row({ title, meta, lead, }: { title: string; meta: string; lead?: string; }) { return (

{lead && ( {lead} )} {title} {meta}

); } const SCREENS: Record = { home: { title: "Home", body: ( <>

Three things on today.

), }, search: { title: "Search", body: ( <>

Recent

), }, activity: { title: "Activity", body: (

), }, profile: { title: "Profile", body: ( <>

YB Yash Bavadiya @xevrion

), }, }; export default function TabBarDemo() { const reduce = useReducedMotion() ?? false; const base = useId(); const [tab, setTab] = useState("home"); const screen = SCREENS[tab]; return ( // 44px outer radius = the screen's 36px plus the 8px bezel.

9:41

{/* Screens share one grid cell while they cross, so the old one never pushes the new one around. */}

{screen.title}

{screen.body}

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