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import { useEffect, useRef, useState } from "react"; import { animate, motion, useMotionValue, useSpring, useTransform, type AnimationPlaybackControls, type MotionValue, type Transition, } from "motion/react"; import { useReducedMotion } from "@/hooks/use-reduced-motion"; import { cn } from "@/lib/utils"; const REST = 40; const PEAK = 72; // How far from the cursor, in px, an icon still feels the pull. const REACH = 140; // Light mass so the icons keep up with a fast cursor; low damping leaves a // small settle, which is what makes the dock feel springy rather than scripted. const SIZE_SPRING = { mass: 0.1, stiffness: 170, damping: 12 }; // The first label waits so a cursor passing through doesn't flash one. const TOOLTIP_DELAY = 300; // The launch: two hops, the second lower, like something being thrown up // and caught. 700ms is well past the UI budget on purpose: it is the // "starting up" signal itself, it happens once per app, and input is never // blocked while it plays. const HOP: { y: number[]; transition: Transition } = { y: [0, -22, 0, -9, 0], // Up fast and down with gravity; each landing is the quickest part. transition: { duration: 0.7, times: [0, 0.3, 0.55, 0.78, 1], ease: ["easeOut", "easeIn", "easeOut", "easeIn"], }, }; // Squashes on each landing, so the icon reads as having weight. const SQUASH: { scaleX: number[]; scaleY: number[]; transition: Transition } = { scaleY: [1, 1.04, 0.9, 1.02, 0.96, 1], scaleX: [1, 0.97, 1.08, 0.99, 1.03, 1], transition: { duration: 0.7, times: [0, 0.3, 0.55, 0.7, 0.8, 1] }, }; type Item = { label: string; icon: React.ReactNode }; type Tip = { label: string; instant: boolean }; export function Dock({ items, defaultRunning = [], onLaunch, }: { items: Item[]; // Labels of the apps that start with a running light under them. defaultRunning?: string[]; onLaunch?: (label: string) => void; }) { const reduceMotion = useReducedMotion(); const mouseX = useMotionValue(Infinity); const [tip, setTip] = useState(null); const [running, setRunning] = useState(defaultRunning); const timer = useRef>(undefined); useEffect(() => () => clearTimeout(timer.current), []); const showTip = (label: string) => { clearTimeout(timer.current); // Once a label is up, moving along the dock swaps it with no delay and no // animation, so scanning the icons feels instant. if (tip) setTip({ label, instant: true }); else timer.current = setTimeout( () => setTip({ label, instant: false }), TOOLTIP_DELAY, ); }; const hideTip = () => { clearTimeout(timer.current); setTip(null); }; return (

{ if (reduceMotion || e.pointerType === "touch") return; mouseX.set(e.clientX); }} onPointerLeave={() => { mouseX.set(Infinity); hideTip(); }} > {items.map((item) => ( showTip(item.label)} onFocus={() => setTip({ label: item.label, instant: false })} onBlur={hideTip} running={running.includes(item.label)} onLaunch={() => { setRunning((r) => r.includes(item.label) ? r : [...r, item.label], ); onLaunch?.(item.label); }} /> ))}

); } function DockItem({ item, mouseX, tip, onEnter, onFocus, onBlur, running, onLaunch, }: { item: Item; mouseX: MotionValue; tip: Tip | null; onEnter: () => void; onFocus: () => void; onBlur: () => void; running: boolean; onLaunch: () => void; }) { const ref = useRef(null); const reduceMotion = useReducedMotion(); const hop = useRef([]); useEffect(() => () => hop.current.forEach((a) => a.stop()), []); const distance = useTransform(mouseX, (x) => { const box = ref.current?.getBoundingClientRect(); return box ? x - box.left - box.width / 2 : Infinity; }); const target = useTransform(distance, [-REACH, 0, REACH], [REST, PEAK, REST]); const size = useSpring(target, SIZE_SPRING); const iconSize = useTransform(size, (s) => s * 0.45); const launch = () => { // Already running: a click just brings it forward, no fanfare. if (running) return; onLaunch(); if (reduceMotion || !ref.current) return; hop.current.forEach((a) => a.stop()); hop.current = [ animate(ref.current, { y: HOP.y }, HOP.transition), animate( ref.current, { scaleX: SQUASH.scaleX, scaleY: SQUASH.scaleY }, SQUASH.transition, ), ]; }; // Width and height animate instead of scale on purpose: the neighbours have // to move apart, and a transform would let the icons overlap instead. return ( { if (e.pointerType !== "touch") onEnter(); }} onClick={launch} onFocus={onFocus} onBlur={onBlur} > {item.icon} {/* Outside the button, so the label holds still while the icon hops. */} {item.label} {/* The running light stays on the shelf while the icon hops, and comes on as it first lands (0.55 of 700ms) rather than on click. */} ); } const ITEMS: Item[] = [ { label: "Home", icon: , }, { label: "Search", icon: ( <> ), }, { label: "Mail", icon: ( <> ), }, { label: "Calendar", icon: ( <> ), }, { label: "Music", icon: ( <> ), }, { label: "Settings", icon: ( <> ), }, ]; export default function DockDemo() { return ; } 5d:["$","div",null,{"className":"mt-3 flex min-h-0 min-w-0 flex-1 flex-col 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