"use client" import React, { useEffect, useMemo, useState } from "react" import { AnimatePresence, motion, useAnimationControls } from "motion/react" import { cn } from "@/lib/utils" type AnimationPhase = "idle" | "forming_column" | "scrolling_down" | "resetting" type AnimatedListProps = { children: React.ReactNode className?: string stackGap?: number columnGap?: number scaleFactor?: number scrollDownDuration?: number formationDuration?: number } type AnimatedListItemProps = { children: React.ReactNode className?: string index: number listLength: number stackGap?: number columnGap?: number scaleFactor?: number } function InternalAnimatedListItem({ children, className, index, listLength, animationPhase, onFormationComplete, stackGap = 10, columnGap = 100, scaleFactor = 0.1, formationDuration = 1, visibleItemsCount = 4, resetSpringStiffness = 120, resetSpringDamping = 20, }: AnimatedListItemProps & { animationPhase: AnimationPhase onFormationComplete?: () => void formationDuration: number visibleItemsCount: number resetSpringStiffness: number resetSpringDamping: number }) { const reverseIndex = listLength - 1 - index const isVisible = reverseIndex < visibleItemsCount const lastItemOffset = (listLength - 1) * columnGap const isLastItem = index === listLength - 1 const itemVariants = { initial: { scale: 1 + index * scaleFactor, y: reverseIndex * stackGap, opacity: isVisible ? 1 : 0, }, column: { scale: 1, y: index * columnGap - lastItemOffset, opacity: 1, }, } const target = animationPhase === "idle" || animationPhase === "resetting" ? "initial" : "column" const getTransition = () => { if (animationPhase === "resetting") { return { type: "spring" as const, stiffness: resetSpringStiffness, damping: resetSpringDamping, } } else { return { duration: formationDuration, ease: [0.4, 0, 0.2, 1] as const } } } const handleAnimationComplete = (definition: string) => { if ( isLastItem && definition === "column" && animationPhase === "forming_column" ) { onFormationComplete?.() } } return ( {children} ) } export function AnimatedList({ children, className, stackGap = 20, columnGap = 85, scaleFactor = 0.05, scrollDownDuration = 5, formationDuration = 1, }: AnimatedListProps) { const initialDelayValue = 500 const loopPauseDurationValue = 100 const listResetSpringStiffness = 100 const listResetSpringDamping = 25 const itemResetSpringStiffness = 120 const itemResetSpringDamping = 20 const visibleItemsCountValue = 4 const [animationPhase, setAnimationPhase] = useState("idle") const listControls = useAnimationControls() const childrenArray = useMemo( () => React.Children.toArray(children), [children] ) const listLength = childrenArray.length const totalHeight = listLength * columnGap useEffect(() => { let timer: NodeJS.Timeout if (animationPhase === "idle") { timer = setTimeout( () => { setAnimationPhase("forming_column") }, animationPhase === "idle" ? loopPauseDurationValue : initialDelayValue ) } return () => clearTimeout(timer) }, [animationPhase, loopPauseDurationValue, initialDelayValue]) const handleFormationComplete = () => { if (animationPhase === "forming_column") setAnimationPhase("scrolling_down") } const handleScrollDownComplete = () => { if (animationPhase === "scrolling_down") setAnimationPhase("resetting") } const handleScrollUpComplete = () => { if (animationPhase === "resetting") setAnimationPhase("idle") } useEffect(() => { if (animationPhase === "scrolling_down") { listControls.start({ y: totalHeight, transition: { duration: scrollDownDuration, ease: [0.4, 0, 0.2, 1] as const, }, }) } else if (animationPhase === "resetting") { listControls.start({ y: 0, transition: { type: "spring" as const, stiffness: listResetSpringStiffness, damping: listResetSpringDamping, }, }) } else { listControls.set({ y: 0 }) } }, [ animationPhase, listControls, totalHeight, scrollDownDuration, listResetSpringStiffness, listResetSpringDamping, ]) const handleListAnimationComplete = (definition: { y?: number }) => { if (definition.y === totalHeight && animationPhase === "scrolling_down") { handleScrollDownComplete() } else if (definition.y === 0 && animationPhase === "resetting") { handleScrollUpComplete() } } return ( {childrenArray.map((child, index) => ( {child} ))} ) }

animated-list

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Dependências