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import { useCallback, useEffect, useId, useMemo, useRef, useState, useSyncExternalStore, } from "react"; import { createPortal } from "react-dom"; import { AnimatePresence, motion } from "motion/react"; import { useReducedMotion } from "@/hooks/use-reduced-motion"; import { cn } from "@/lib/utils"; const EASE_OUT = [0.23, 1, 0.32, 1] as const; // Opened constantly, so the entrance is barely there: fast enough never to // feel like waiting, just enough that the panel arrives rather than blinks. const OPEN = { duration: 0.15, ease: EASE_OUT }; // Closing is quicker still; nobody watches a palette leave. const CLOSE = { duration: 0.1, ease: EASE_OUT }; export type Command = { id: string; label: string; group: string; icon: React.ReactNode; shortcut?: string[]; }; type Match = { command: Command; ranges: [number, number][] }; // Contiguous substring first, so "set" highlights "Settings" as one run // instead of scattered letters; subsequence is the fallback ("gtst"). function match(label: string, query: string): [number, number][] | null { if (!query) return []; const hay = label.toLowerCase(); const needle = query.toLowerCase(); const at = hay.indexOf(needle); if (at !== -1) return [[at, at + needle.length]]; const ranges: [number, number][] = []; let from = 0; for (const char of needle) { const i = hay.indexOf(char, from); if (i === -1) return null; const last = ranges[ranges.length - 1]; if (last && last[1] === i) last[1] = i + 1; else ranges.push([i, i + 1]); from = i + 1; } return ranges; } const subscribeNoop = () => () => {}; function useIsMac() { // Server renders "Ctrl"; the client corrects it without a hydration mismatch. return useSyncExternalStore( subscribeNoop, () => /Mac|iPhone|iPad/.test(navigator.platform), () => false, ); } // The portal needs document.body, which only exists on the client. function useIsClient() { return useSyncExternalStore( subscribeNoop, () => true, () => false, ); } /** * Opened many times a day, so every animation stays tiny: a 150ms entrance, * a 100ms exit, and the active item moves instantly with the keys. Anything * longer would be paid on every use. */ export function CommandPalette({ commands, onRun, placeholder = "Type a command or search", className, }: { commands: Command[]; onRun?: (command: Command) => void; placeholder?: string; className?: string; }) { const isMac = useIsMac(); const isClient = useIsClient(); const reduceMotion = useReducedMotion(); const id = useId(); const [open, setOpen] = useState(false); const [query, setQuery] = useState(""); const [active, setActive] = useState(0); const triggerRef = useRef(null); // Last pointer position, so a list scrolling under a still cursor (which // browsers can report as hover) never steals the active item from the keys. const pointer = useRef<{ x: number; y: number } | null>(null); const results = useMemo(() => { const matches: Match[] = []; for (const command of commands) { const ranges = match(command.label, query.trim()); if (ranges) matches.push({ command, ranges }); } const groups = [...new Set(matches.map((m) => m.command.group))]; return groups.map((group) => ({ group, items: matches.filter((m) => m.command.group === group), })); }, [commands, query]); // Flattened in rendered order, so arrow keys and indices always agree even // when commands arrive with their groups interleaved. const flat = useMemo(() => results.flatMap((g) => g.items), [results]); const activeIndex = Math.min(active, Math.max(flat.length - 1, 0)); const activeItem = flat[activeIndex]; const optionId = useCallback( (command: Command) => `${id}-option-${command.id}`, [id], ); const show = useCallback(() => { setQuery(""); setActive(0); pointer.current = null; setOpen(true); }, []); const close = useCallback(() => { setOpen(false); triggerRef.current?.focus(); }, []); const run = (command: Command) => { close(); onRun?.(command); }; useEffect(() => { const onKeyDown = (e: KeyboardEvent) => { if (e.key.toLowerCase() !== "k" || !(e.metaKey || e.ctrlKey)) return; if (e.altKey || e.shiftKey || e.repeat) return; // Inert copies, like the index preview, stay quiet. if (triggerRef.current?.closest("[inert]")) return; // Browsers bind Ctrl+K to address bar search. Marking it handled also // tells the site's own search to stand aside on this page. e.preventDefault(); if (open) close(); else show(); }; // Capture, so it runs before the site's search, which listens later. window.addEventListener("keydown", onKeyDown, true); return () => window.removeEventListener("keydown", onKeyDown, true); }, [open, close, show]); useEffect(() => { if (!open || !activeItem) return; // Smooth, so stepping past the edge glides the list along rather than // jumping it. "nearest" means it only scrolls when the item is out of view. document.getElementById(optionId(activeItem.command))?.scrollIntoView({ block: "nearest", behavior: reduceMotion ? "auto" : "smooth", }); }, [open, activeItem, optionId, reduceMotion]); const onInputKeyDown = (e: React.KeyboardEvent) => { if (e.nativeEvent.isComposing) return; const count = flat.length; if (e.key === "ArrowDown" || e.key === "ArrowUp") { e.preventDefault(); if (!count) return; const step = e.key === "ArrowDown" ? 1 : -1; setActive((activeIndex + step + count) % count); } else if (e.key === "Enter") { e.preventDefault(); if (activeItem) run(activeItem.command); } else if (e.key === "Escape") { e.preventDefault(); close(); } else if (e.key === "Tab") { // The input is the dialog's only tab stop; keep focus inside. e.preventDefault(); } }; const onOptionPointerMove = (e: React.PointerEvent, index: number) => { if (e.pointerType === "touch") return; const last = pointer.current; if (last && last.x === e.clientX && last.y === e.clientY) return; pointer.current = { x: e.clientX, y: e.clientY }; if (index !== activeIndex) setActive(index); }; let index = -1; return ( <> {isClient && createPortal( {open && ( {/* Token-only dim: a grey wash in light, near black in dark. */}

)} , document.body, )} ); } function Highlight({ label, ranges, }: { label: string; ranges: [number, number][]; }) { if (!ranges.length) return {label}; const parts: React.ReactNode[] = []; let cursor = 0; for (const [start, end] of ranges) { if (start > cursor) parts.push(label.slice(cursor, start)); parts.push( {label.slice(start, end)} , ); cursor = end; } parts.push(label.slice(cursor)); return {parts}; } function Kbd({ keys }: { keys: string[] }) { return ( {keys.map((key, i) => ( {key} ))} ); } function LineIcon({ children }: { children: React.ReactNode }) { return ( ); } function SearchIcon() { return ( ); } const DEMO_COMMANDS: Command[] = [ { id: "home", group: "Navigation", label: "Go to Home", shortcut: ["G", "H"], icon: ( ), }, { id: "inbox", group: "Navigation", label: "Open Inbox", shortcut: ["G", "I"], icon: ( ), }, { id: "settings", group: "Navigation", label: "Go to Settings", shortcut: ["G", "S"], icon: ( ), }, { id: "docs", group: "Navigation", label: "Search documentation", icon: ( ), }, { id: "new-file", group: "Actions", label: "New file", shortcut: ["⌘", "N"], icon: ( ), }, { id: "copy-link", group: "Actions", label: "Copy link", icon: ( ), }, { id: "theme", group: "Actions", label: "Toggle theme", shortcut: ["⇧", "T"], icon: ( ), }, { id: "logout", group: "Actions", label: "Log out", icon: ( ), }, ]; export default function CommandPaletteDemo() { const [ran, setRan] = useState(null); return (

setRan(command.label)} /> {/* Height reserved up front, so the confirmation appearing never shifts the trigger in the centered demo. */}

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