"use client" import { useEffect, useMemo, useRef, useState, type ComponentType, type RefAttributes, type RefObject, } from "react" import { motion, useInView, type DOMMotionComponents, type HTMLMotionProps, type MotionProps, } from "motion/react" import { cn } from "@/lib/utils" const motionElements = { article: motion.article, div: motion.div, h1: motion.h1, h2: motion.h2, h3: motion.h3, h4: motion.h4, h5: motion.h5, h6: motion.h6, li: motion.li, p: motion.p, section: motion.section, span: motion.span, } as const type MotionElementType = Extract< keyof DOMMotionComponents, keyof typeof motionElements > type TypingAnimationMotionComponent = ComponentType< Omit, "ref"> & RefAttributes > interface TypingAnimationProps extends Omit { children?: string words?: string[] className?: string duration?: number typeSpeed?: number deleteSpeed?: number delay?: number pauseDelay?: number loop?: boolean as?: MotionElementType startOnView?: boolean showCursor?: boolean blinkCursor?: boolean cursorStyle?: "line" | "block" | "underscore" } export function TypingAnimation({ children, words, className, duration = 100, typeSpeed, deleteSpeed, delay = 0, pauseDelay = 1000, loop = false, as: Component = "span", startOnView = true, showCursor = true, blinkCursor = true, cursorStyle = "line", ...props }: TypingAnimationProps) { const MotionComponent = motionElements[ Component ] as TypingAnimationMotionComponent const [displayedText, setDisplayedText] = useState("") const [currentWordIndex, setCurrentWordIndex] = useState(0) const [currentCharIndex, setCurrentCharIndex] = useState(0) const [phase, setPhase] = useState<"typing" | "pause" | "deleting">("typing") const elementRef = useRef(null) const isInView = useInView(elementRef as RefObject, { amount: 0.3, once: true, }) const wordsToAnimate = useMemo( () => words ?? (children ? [children] : []), [words, children] ) const hasMultipleWords = wordsToAnimate.length > 1 const typingSpeed = typeSpeed ?? duration const deletingSpeed = deleteSpeed ?? typingSpeed / 2 const shouldStart = startOnView ? isInView : true const animationSourceKey = useMemo( () => (words ? words.join("\u0000") : (children ?? "")), [words, children] ) useEffect(() => { setDisplayedText("") setCurrentWordIndex(0) setCurrentCharIndex(0) setPhase("typing") }, [animationSourceKey]) useEffect(() => { let timeout: ReturnType | null = null if (shouldStart && wordsToAnimate.length > 0) { const timeoutDelay = delay > 0 && displayedText === "" ? delay : phase === "typing" ? typingSpeed : phase === "deleting" ? deletingSpeed : pauseDelay timeout = setTimeout(() => { const currentWord = wordsToAnimate[currentWordIndex] || "" const graphemes = Array.from(currentWord) switch (phase) { case "typing": if (currentCharIndex < graphemes.length) { setDisplayedText( graphemes.slice(0, currentCharIndex + 1).join("") ) setCurrentCharIndex(currentCharIndex + 1) } else { if (hasMultipleWords || loop) { const isLastWord = currentWordIndex === wordsToAnimate.length - 1 if (!isLastWord || loop) { setPhase("pause") } } } break case "pause": setPhase("deleting") break case "deleting": if (currentCharIndex > 0) { setDisplayedText( graphemes.slice(0, currentCharIndex - 1).join("") ) setCurrentCharIndex(currentCharIndex - 1) } else { const nextIndex = (currentWordIndex + 1) % wordsToAnimate.length setCurrentWordIndex(nextIndex) setPhase("typing") } break } }, timeoutDelay) } return () => { if (timeout !== null) { clearTimeout(timeout) } } }, [ shouldStart, phase, currentCharIndex, currentWordIndex, displayedText, wordsToAnimate, hasMultipleWords, loop, typingSpeed, deletingSpeed, pauseDelay, delay, ]) const currentWordGraphemes = Array.from( wordsToAnimate[currentWordIndex] || "" ) const isComplete = !loop && currentWordIndex === wordsToAnimate.length - 1 && currentCharIndex >= currentWordGraphemes.length && phase !== "deleting" const shouldShowCursor = showCursor && !isComplete && (hasMultipleWords || loop || currentCharIndex < currentWordGraphemes.length) const getCursorChar = () => { switch (cursorStyle) { case "block": return "▌" case "underscore": return "_" case "line": default: return "|" } } return ( {displayedText} {shouldShowCursor && ( {getCursorChar()} )} ) }

Typing Animation

Instalação

Dependências