"use client" import { useEffect, useRef, useState } from "react" import { animate, motion, useInView, useMotionValue, useReducedMotion, useTransform, type HTMLMotionProps, } from "motion/react" import { cn } from "@/lib/utils" const DEFAULT_COLORS = ["#c679c4", "#fa3d1d", "#ffb005", "#e1e1fe", "#0358f7"] const BAND_HALF = 17 const SWEEP_START = -BAND_HALF const SWEEP_END = 100 + BAND_HALF const sweepEase = (t: number) => t < 0.5 ? 4 * t ** 3 : 1 - (-2 * t + 2) ** 3 / 2 function buildGradient(pos: number, colors: string[], textColor: string) { const bandStart = pos - BAND_HALF const bandEnd = pos + BAND_HALF if (bandStart >= 100) { return `linear-gradient(90deg, ${textColor}, ${textColor})` } const n = colors.length const parts: string[] = [] if (bandStart > 0) parts.push(`${textColor} 0%`, `${textColor} ${bandStart.toFixed(2)}%`) colors.forEach((c, i) => { const pct = n === 1 ? pos : bandStart + (i / (n - 1)) * BAND_HALF * 2 parts.push(`${c} ${pct.toFixed(2)}%`) }) if (bandEnd < 100) parts.push(`transparent ${bandEnd.toFixed(2)}%`, `transparent 100%`) return `linear-gradient(90deg, ${parts.join(", ")})` } function measureWidths(el: HTMLElement, texts: string[]) { const ghost = el.cloneNode() as HTMLElement Object.assign(ghost.style, { position: "absolute", visibility: "hidden", pointerEvents: "none", width: "auto", whiteSpace: "nowrap", }) el.parentElement!.appendChild(ghost) const widths = texts.map((t) => { ghost.textContent = t return ghost.getBoundingClientRect().width }) ghost.remove() return widths } /** * Props for {@link DiaTextReveal}. */ export interface DiaTextRevealProps extends Omit< HTMLMotionProps<"span">, "ref" | "children" | "style" | "animate" | "transition" | "color" > { /** * Text to reveal. Pass multiple strings to rotate when {@link DiaTextRevealProps.repeat} is `true`. */ text: string | string[] /** * Colors sampled across the moving gradient band. Defaults to a built-in palette. */ colors?: string[] /** * CSS color for revealed text after the sweep and for leading/trailing regions during the animation. * @defaultValue `"var(--foreground)"` */ textColor?: string /** * Duration of one sweep pass, in seconds. * @defaultValue `1.5` */ duration?: number /** * Delay before the sweep starts, in seconds. * @defaultValue `0` */ delay?: number /** * When `text` is an array, replay the sweep and advance to the next string after each completion. * @defaultValue `false` */ repeat?: boolean /** * Pause between cycles when {@link DiaTextRevealProps.repeat} is `true`, in seconds. * @defaultValue `0.5` */ repeatDelay?: number /** * If `true`, the animation starts only after the element enters the viewport. * @defaultValue `true` */ startOnView?: boolean /** * Passed to `useInView`: if `true`, in-view detection fires at most once (no replay on scroll-back). * @defaultValue `true` */ once?: boolean /** * Additional class names for the animated `span` (e.g. typography utilities). */ className?: string /** * When `text` has multiple entries, use the widest string’s width for layout instead of animating width per line. * @defaultValue `false` */ fixedWidth?: boolean } export function DiaTextReveal({ text, colors = DEFAULT_COLORS, textColor = "var(--foreground)", duration = 1.5, delay = 0, repeat = false, repeatDelay = 0.5, startOnView = true, once = true, className, fixedWidth = false, ...props }: DiaTextRevealProps) { const texts = Array.isArray(text) ? text : [text] const isMulti = texts.length > 1 const prefersReducedMotion = useReducedMotion() const spanRef = useRef(null) const optsRef = useRef({ colors, textColor, duration, delay, repeat, repeatDelay, texts, }) optsRef.current = { colors, textColor, duration, delay, repeat, repeatDelay, texts, } const indexRef = useRef(0) const hasPlayedRef = useRef(false) const timerRef = useRef>(undefined) const playRef = useRef<() => void>(null!) const stopRef = useRef<(() => void) | null>(null) const [activeIndex, setActiveIndex] = useState(0) const [measuredWidths, setMeasuredWidths] = useState([]) const sweepPos = useMotionValue(SWEEP_START) const backgroundImage = useTransform(sweepPos, (pos) => buildGradient(pos, optsRef.current.colors, optsRef.current.textColor) ) const isInView = useInView(spanRef, { once, amount: 0.1 }) useEffect(() => { const el = spanRef.current if (!el || !isMulti) return setMeasuredWidths(measureWidths(el, texts)) }, [Array.isArray(text) ? text.join("\0") : text]) playRef.current = () => { const { duration, delay, repeat, repeatDelay, texts } = optsRef.current sweepPos.set(SWEEP_START) const controls = animate(sweepPos, SWEEP_END, { duration, delay, ease: sweepEase, onComplete() { if (!repeat) return timerRef.current = setTimeout(() => { const next = (indexRef.current + 1) % texts.length indexRef.current = next setActiveIndex(next) playRef.current() }, repeatDelay * 1000) }, }) stopRef.current = () => controls.stop() } useEffect(() => { if (prefersReducedMotion) { sweepPos.set(SWEEP_END) return } if (startOnView && !isInView) return if (once && hasPlayedRef.current) return hasPlayedRef.current = true playRef.current() return () => { stopRef.current?.() clearTimeout(timerRef.current) } }, [isInView, startOnView, once, prefersReducedMotion, sweepPos]) const fixedW = isMulti && fixedWidth && measuredWidths.length > 0 ? Math.max(...measuredWidths) : undefined const animatedW = isMulti && !fixedWidth && measuredWidths[activeIndex] != null ? measuredWidths[activeIndex] : undefined return ( {texts[activeIndex]} ) }

Dia Text Reveal

Instalação

Dependências