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import { useEffect, useId, useRef, useState } from "react"; import { AnimatePresence, motion } from "motion/react"; import { useReducedMotion } from "@/hooks/use-reduced-motion"; import { cn } from "@/lib/utils"; // A chip is a small physical thing, so it lands with the faintest settle. const POP = { type: "spring", visualDuration: 0.25, bounce: 0.15 } as const; // Exits are quicker than the pop, so removing never holds the eye. const LEAVE = { duration: 0.15, ease: [0.23, 1, 0.32, 1] } as const; // No bounce on the slide: the row closing up should read as settled. const SLIDE = { type: "spring", visualDuration: 0.25, bounce: 0 } as const; const key = (tag: string) => tag.toLowerCase(); export function TagInput({ label, tags, onTagsChange, placeholder = "Add a tag", className, }: { label: string; tags: string[]; onTagsChange: (tags: string[]) => void; placeholder?: string; className?: string; }) { const reduceMotion = useReducedMotion(); const id = useId(); const [draft, setDraft] = useState(""); // Index of the chip the first Backspace armed; the second one removes it. const [armed, setArmed] = useState(-1); // The tag just typed into the field, if any. It becomes a chip right // where its letters already are: the words stay put and the chip forms // around them, rather than the text vanishing and a chip popping in. const [formed, setFormed] = useState(null); const [announcement, setAnnouncement] = useState(""); const inputRef = useRef(null); const chipRefs = useRef(new Map()); const shakes = useRef(new Map()); useEffect(() => { const running = shakes.current; return () => running.forEach((a) => a.cancel()); }, []); const nudge = (tag: string) => { const el = chipRefs.current.get(key(tag)); if (!el) return; shakes.current.get(key(tag))?.cancel(); // Motion owns the chip's transform for layout, so the shake runs on an // inner span through `translate`, which never fights it. Decaying 4px // swings say "already here" without reading as an error. const animation = reduceMotion ? el.animate({ opacity: [1, 0.4, 1] }, { duration: 300 }) : el.animate( { translate: ["0", "-4px", "4px", "-3px", "2px", "0"] }, { duration: 300, easing: "cubic-bezier(0.23, 1, 0.32, 1)" }, ); shakes.current.set(key(tag), animation); }; const add = (raw: string[], typed = false) => { const next = [...tags]; const added: string[] = []; for (const part of raw) { const tag = part.trim(); if (!tag) continue; const existing = next.find((t) => key(t) === key(tag)); if (existing) { nudge(existing); setAnnouncement(`${existing} is already added`); continue; } next.push(tag); added.push(tag); } if (added.length) { // Only a single typed tag sits where the draft was. Pasted lists pop // in as usual, since most of their chips land away from the caret. setFormed(typed && added.length === 1 ? key(added[0]) : null); onTagsChange(next); setAnnouncement(`Added ${added.join(", ")}`); } setDraft(""); setArmed(-1); }; const remove = (index: number) => { const tag = tags[index]; onTagsChange(tags.filter((_, i) => i !== index)); setAnnouncement(`Removed ${tag}`); setArmed(-1); }; return (

{label} {/* Clicking the field's empty space types into it, like a real input. The field grows downward as chips wrap. */}

{ const target = e.target as HTMLElement; if (target !== e.currentTarget && !target.dataset.fill) return; e.preventDefault(); inputRef.current?.focus(); }} >

{tags.map((tag, i) => ( { if (el) chipRefs.current.set(key(tag), el); else chipRefs.current.delete(key(tag)); }} className={cn( "relative flex h-8 max-w-full items-center gap-0.5 pr-1 pl-2.5 text-sm transition-[color] duration-150 ease-out", armed === i ? "text-background" : "text-foreground", )} > {/* The chip's body, separate from its text, so a freshly typed tag can grow a chip around words that never move. */} {tag} ))} { const value = e.target.value; // Mobile keyboards often never fire a comma keydown. if (value.includes(",")) add(value.split(","), true); else { setDraft(value); setArmed(-1); } }} onBlur={() => setArmed(-1)} onPaste={(e) => { const text = e.clipboardData.getData("text"); if (!/[,\n]/.test(text)) return; e.preventDefault(); add((draft + text).split(/[,\n]/)); }} onKeyDown={(e) => { if (e.key === "Enter" || e.key === ",") { e.preventDefault(); add([draft], true); } else if ( e.key === "Backspace" && draft === "" && tags.length ) { e.preventDefault(); const last = tags.length - 1; if (armed === last) remove(last); else setArmed(last); } else if (e.key === "Escape") { setArmed(-1); } }} // 10px in, the same as a chip's text, so a typed tag becomes a // chip without its letters shifting. className="h-8 w-full min-w-0 bg-transparent pr-2 pl-2.5 text-sm text-foreground outline-hidden placeholder:text-muted-foreground" />

Press Enter or comma to add. Backspace twice removes the last tag.

{announcement}

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