Skill v1.0.2

currentAutomated scan100/100

affaan-m/ecc/motion-advanced

4 files

──Details

PublishedAugust 28, 2026 at 10:42 PM

Content Hashsha256:1ee09b942bf328ff...

Git SHA2aebdd340860

Bump Typepatch

Compare with v1.0.1

──Files

Files (1 file, 18.4 KB)

SKILL.md18.4 KBactive

SKILL.md · 599 lines · 18.4 KB

version: "1.0.2" name: motion-advanced description: Advanced motion patterns for React / Next.js — drag & drop, gestures, text animations, SVG path drawing, custom hooks, imperative sequences (useAnimate), loaders, and the full API decision tree. Requires motion-foundations. Use when building drag and drop, gestures, text or SVG animation, or imperative animation sequences in React or Next.js. tags: [motion, animation, advanced, gestures, svg] category: frontend author: jeff metadata: version: 1.0.0

Motion Advanced

Complex, interactive, and physics-based animation patterns. Requires motion-foundations to be set up first. Use these when motion-patterns is not enough.

When to Activate

Building drag-to-dismiss sheets, swipe gestures, or reorderable lists
Animating text word-by-word, character-by-character, or as a live counter
Drawing SVG paths, morphing icons, or animating circular progress
Writing a custom animation hook (useScrollReveal, magnetic button, cursor follower)
Sequencing multi-step animations imperatively with useAnimate
Building spinners, shimmer skeletons, pulse indicators, or loading button states

Outputs

This skill produces:

Drag interactions: draggable cards, drag-to-dismiss sheets, Reorder.Group lists
Gesture hooks: swipe detection, long press, pinch outline
Text animation components: word reveal, character typewriter, number counter
SVG animation: path draw-on, icon morph, stroke progress ring
Custom hooks: useScrollReveal, useHoverScale, useNavigationDirection, useInViewOnce
Imperative sequences via useAnimate with interrupt-safe async/await
Loader components: spinner, shimmer, pulse dot, progress bar, button loading state

Principles

Physics-based motion (useSpring, springs.*) always feels more natural than duration-based for direct manipulation.
useMotionValue + useTransform computes derived values without triggering re-renders.
useAnimate sequences are imperative and interrupt-safe — calling animate() mid-flight cancels the previous animation automatically.
Motion values (useMotionValue, useSpring) are SSR-safe and do not cause hydration errors.

Rules

Drag interactions must be tested on touch devices, not just mouse. drag prop works on both but feel and threshold differ.
Infinite animations must pause when `document.visibilityState === "hidden"`. Background tabs must not consume GPU/CPU.
Swipe threshold must be explicit. Never infer intent from velocity alone; combine offset + velocity checks.
`useAnimate` scope ref must be attached to a mounted DOM element. Calling animate() before mount throws silently.
Motion values must not be recreated on render. useMotionValue(0) inside a component body is correct; new MotionValue(0) in a render is not.
All token values are imported from `motion-foundations`. No inline numbers.
Custom hooks must handle cleanup. Every window.addEventListener needs a matching removeEventListener in the useEffect return.
SVG morphing requires equal path command counts. Paths with different command structures snap instead of interpolating.

Decision Guidance

Choosing the right advanced API

Scenario	API
Drag with physics on release	`drag` + `dragTransition: springs.release`
Ordered drag-to-reorder list	`Reorder.Group` + `Reorder.Item`
Dismiss on drag offset	`drag="y"` + `onDragEnd` offset check
Swipe left/right	`drag="x"` + `onDragEnd` offset check
Long press	`useLongPress` hook
Value smoothed over time	`useSpring`
Value derived from another	`useTransform`
Multi-step sequence	`useAnimate` with `async/await`
One-shot imperative animation	`animate()` from `motion`
Text entering word by word	Stagger on `inline-block` spans
SVG drawing on	`pathLength` 0 → 1
SVG morph	`d` attribute tween (equal commands)
Circular progress	`strokeDashoffset` tween

When to use `useSpring` vs a spring transition

	`useSpring`	`transition: springs.*`
Use for	Cursor follower, pointer-tracked values	Discrete state changes
Updates	Continuous, on every frame	Triggered by state change
Interrupt	Smooth — physics picks up from velocity	Restarts from current value

Core Concepts

useMotionValue + useTransform

Reactive computation without re-renders:

tsx

const x = useMotionValue(0)
const opacity = useTransform(x, [-200, 0, 200], [0, 1, 0])
// opacity updates every frame as x changes — no setState, no re-render

useAnimate

Returns [scope, animate]. The scope ref must be attached to a DOM element. animate() calls are interrupt-safe — calling mid-flight cancels the previous run.

tsx

const [scope, animate] = useAnimate()
async function play() {
  await animate(".step-1", { opacity: 1 }, { duration: 0.3 })
  await animate(".step-2", { x: 0 },       { duration: 0.4 })
        animate(".step-3", { scale: 1 },    { duration: 0.25 })  // fire and forget
}
return <div ref={scope}>...</div>

Code Examples

Draggable card

tsx

"use client"
import { motion } from "motion/react"
import { springs, motionTokens } from "@/lib/motion-tokens"
<motion.div
  drag
  dragConstraints={{ left: -100, right: 100, top: -100, bottom: 100 }}
  dragElastic={0.1}
  whileDrag={{
    scale: motionTokens.scale.pop,
    boxShadow: "0 16px 40px rgba(0,0,0,0.2)",
  }}
  dragTransition={springs.release}
/>

Drag-to-dismiss sheet

tsx

"use client"
import { motion, useMotionValue, useTransform } from "motion/react"
export function BottomSheet({ onClose }: { onClose: () => void }) {
  const y = useMotionValue(0)
  const opacity = useTransform(y, [0, 200], [1, 0])
  return (
    <motion.div
      drag="y"
      dragConstraints={{ top: 0 }}
      style={{ y, opacity }}
      onDragEnd={(_, info) => {
        // Rule 3: combine offset + velocity
        if (info.offset.y > 120 || info.velocity.y > 500) onClose()
      }}
    />
  )
}

Reorderable list

tsx

"use client"
import { Reorder } from "motion/react"
export function SortableList() {
  const [items, setItems] = useState(initialItems)
  return (
    <Reorder.Group axis="y" values={items} onReorder={setItems}>
      {items.map((item) => (
        <Reorder.Item key={item.id} value={item}>
          {item.label}
        </Reorder.Item>
      ))}
    </Reorder.Group>
  )
}

Swipe detection

tsx

"use client"
import { motion } from "motion/react"
const OFFSET_THRESHOLD  = 50
const VELOCITY_THRESHOLD = 300
<motion.div
  drag="x"
  dragConstraints={{ left: 0, right: 0 }}
  onDragEnd={(_, info) => {
    const swipedRight = info.offset.x > OFFSET_THRESHOLD  || info.velocity.x > VELOCITY_THRESHOLD
    const swipedLeft  = info.offset.x < -OFFSET_THRESHOLD || info.velocity.x < -VELOCITY_THRESHOLD
    if (swipedRight) onSwipeRight()
    if (swipedLeft)  onSwipeLeft()
  }}
/>

Long press hook

tsx

import { useRef } from "react"
export function useLongPress(callback: () => void, ms = 600) {
  const timerRef = useRef<ReturnType<typeof setTimeout>>()
  return {
    onPointerDown:  () => { timerRef.current = setTimeout(callback, ms) },
    onPointerUp:    () => clearTimeout(timerRef.current),
    onPointerLeave: () => clearTimeout(timerRef.current),
  }
}

Word-by-word reveal

tsx

"use client"
import { motion } from "motion/react"
import { springs } from "@/lib/motion-tokens"
export function AnimatedText({ text }: { text: string }) {
  return (
    <motion.p
      variants={{ visible: { transition: { staggerChildren: 0.05 } } }}
      initial="hidden"
      animate="visible"
    >
      {text.split(" ").map((word, i) => (
        <motion.span
          key={i}
          className="inline-block mr-1"
          variants={{
            hidden:  { opacity: 0, y: 12 },
            visible: { opacity: 1, y: 0, transition: springs.gentle },
          }}
        >
          {word}
        </motion.span>
      ))}
    </motion.p>
  )
}

Number counter

tsx

"use client"
import { useRef, useEffect } from "react"
import { animate } from "motion"
import { motionTokens } from "@/lib/motion-tokens"
export function Counter({ to }: { to: number }) {
  const nodeRef = useRef<HTMLSpanElement>(null)
  useEffect(() => {
    const controls = animate(0, to, {
      duration: motionTokens.duration.crawl,
      ease: motionTokens.easing.smooth,
      onUpdate: (v) => {
        if (nodeRef.current) nodeRef.current.textContent = Math.round(v).toString()
      },
    })
    return controls.stop   // Rule 7: cleanup
  }, [to])
  return <span ref={nodeRef} />
}

SVG path draw-on

tsx

"use client"
import { motion } from "motion/react"
import { motionTokens } from "@/lib/motion-tokens"
<motion.path
  d="M 0 100 Q 50 0 100 100"
  initial={{ pathLength: 0, opacity: 0 }}
  animate={{ pathLength: 1, opacity: 1 }}
  transition={{ duration: motionTokens.duration.slow, ease: motionTokens.easing.smooth }}
/>

Stroke progress ring

tsx

"use client"
import { motion } from "motion/react"
import { motionTokens } from "@/lib/motion-tokens"
const CIRCUMFERENCE = 2 * Math.PI * 40   // r=40
export function ProgressRing({ progress }: { progress: number }) {
  return (
    <svg width="100" height="100" viewBox="0 0 100 100">
      <circle cx="50" cy="50" r="40" fill="none" stroke="#e5e7eb" strokeWidth="8" />
      <motion.circle
        cx="50" cy="50" r="40"
        fill="none" stroke="#6366f1" strokeWidth="8"
        strokeLinecap="round"
        strokeDasharray={CIRCUMFERENCE}
        animate={{ strokeDashoffset: CIRCUMFERENCE - (progress / 100) * CIRCUMFERENCE }}
        transition={{ duration: motionTokens.duration.normal, ease: motionTokens.easing.smooth }}
        style={{ rotate: -90, transformOrigin: "center" }}
      />
    </svg>
  )
}

useScrollReveal hook

tsx

"use client"
import { useRef } from "react"
import { useScroll, useTransform } from "motion/react"
import { motionTokens } from "@/lib/motion-tokens"
export function useScrollReveal() {
  const ref = useRef(null)
  const { scrollYProgress } = useScroll({ target: ref, offset: ["start end", "end start"] })
  const opacity = useTransform(scrollYProgress, [0, 0.3], [0, 1])
  const y       = useTransform(scrollYProgress, [0, 0.3], [motionTokens.distance.lg, 0])
  return { ref, style: { opacity, y } }
}
// Usage
const { ref, style } = useScrollReveal()
<motion.section ref={ref} style={style} />

Cursor follower

tsx

"use client"
import { useEffect } from "react"
import { motion, useMotionValue, useSpring } from "motion/react"
import { springs } from "@/lib/motion-tokens"
export function CursorFollower() {
  const x = useMotionValue(-100)
  const y = useMotionValue(-100)
  const sx = useSpring(x, springs.gentle)
  const sy = useSpring(y, springs.gentle)
  useEffect(() => {
    const move = (e: MouseEvent) => { x.set(e.clientX); y.set(e.clientY) }
    window.addEventListener("mousemove", move)
    return () => window.removeEventListener("mousemove", move)   // Rule 7
  }, [])
  return (
    <motion.div
      className="fixed top-0 left-0 w-6 h-6 rounded-full bg-indigo-500
                 pointer-events-none -translate-x-1/2 -translate-y-1/2 z-50"
      style={{ x: sx, y: sy }}
    />
  )
}

Shimmer skeleton

tsx

"use client"
import { useEffect } from "react"
import { motion, useAnimation } from "motion/react"
import { motionTokens } from "@/lib/motion-tokens"
export function ShimmerSkeleton({ className = "" }: { className?: string }) {
  const controls = useAnimation()
  useEffect(() => {
    const play = () =>
      controls.start({
        x: ["-100%", "100%"],
        transition: {
          repeat: Infinity,
          duration: motionTokens.duration.crawl,
          ease: motionTokens.easing.linear,
        },
      })
    const handleVisibility = () => {
      if (document.visibilityState === "hidden") controls.stop()
      else void play()
    }
    void play()
    document.addEventListener("visibilitychange", handleVisibility)
    return () => {
      controls.stop()
      document.removeEventListener("visibilitychange", handleVisibility)
    }
  }, [controls])
  return (
    <div className={`relative overflow-hidden bg-gray-200 rounded ${className}`}>
      <motion.div
        className="absolute inset-0 bg-gradient-to-r from-transparent via-white/60 to-transparent"
        initial={{ x: "-100%" }}
        animate={controls}
      />
    </div>
  )
}

Button loading state

tsx

"use client"
import { motion, AnimatePresence } from "motion/react"
import { motionTokens, springs } from "@/lib/motion-tokens"
export function LoadingButton({
  loading,
  label,
  onClick,
}: {
  loading: boolean
  label: string
  onClick: () => void
}) {
  return (
    <motion.button
      onClick={onClick}
      animate={{ opacity: loading ? 0.7 : 1 }}
      whileTap={loading ? {} : { scale: motionTokens.scale.press }}
      transition={springs.snappy}
      disabled={loading}
    >
      <AnimatePresence mode="wait">
        {loading ? (
          <motion.span
            key="loading"
            initial={{ opacity: 0 }} animate={{ opacity: 1 }} exit={{ opacity: 0 }}
            transition={{ duration: motionTokens.duration.fast }}
          >
            …
          </motion.span>
        ) : (
          <motion.span
            key="label"
            initial={{ opacity: 0 }} animate={{ opacity: 1 }} exit={{ opacity: 0 }}
            transition={{ duration: motionTokens.duration.fast }}
          >
            {label}
          </motion.span>
        )}
      </AnimatePresence>
    </motion.button>
  )
}

Infinite animation with visibility pause

tsx

"use client"
import { useEffect } from "react"
import { motion, useAnimation } from "motion/react"
import { motionTokens } from "@/lib/motion-tokens"
export function PulseDot() {
  const controls = useAnimation()
  useEffect(() => {
    const pulse = () =>
      controls.start({
        scale: [1, 1.4, 1],
        opacity: [1, 0.6, 1],
        transition: { repeat: Infinity, duration: motionTokens.duration.crawl },
      })
    // Rule 2: pause when tab is hidden
    const handleVisibility = () => {
      if (document.visibilityState === "hidden") controls.stop()
      else void pulse()
    }
    void pulse()
    document.addEventListener("visibilitychange", handleVisibility)
    // Rule 7: stop controls and remove listeners on unmount.
    return () => {
      controls.stop()
      document.removeEventListener("visibilitychange", handleVisibility)
    }
  }, [controls])
  return <motion.span className="w-2 h-2 rounded-full bg-green-400" animate={controls} />
}

End-to-End Example

Drag-to-dismiss sheet with shimmer content, loading state, and reduced motion support — combining useMotionValue, useTransform, useSafeMotion, AnimatePresence, and tokens from motion-foundations:

tsx

"use client"
import { useState } from "react"
import { motion, AnimatePresence, useMotionValue, useTransform } from "motion/react"
import { springs, motionTokens } from "@/lib/motion-tokens"
import { useSafeMotion } from "@/hooks/use-reduced-motion"
import { ShimmerSkeleton } from "./shimmer-skeleton"
export function DismissibleSheet({
  isOpen,
  onClose,
  loading,
  children,
}: {
  isOpen: boolean
  onClose: () => void
  loading: boolean
  children: React.ReactNode
}) {
  const safe = useSafeMotion(motionTokens.distance.xl)
  const y = useMotionValue(0)
  const opacity = useTransform(y, [0, 200], [1, 0])
  return (
    <AnimatePresence>
      {isOpen && (
        <>
          {/* Backdrop */}
          <motion.div
            key="backdrop"
            className="fixed inset-0 bg-black/40"
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            exit={{ opacity: 0 }}
            onClick={onClose}
          />
          {/* Sheet — drag-to-dismiss */}
          <motion.div
            key="sheet"
            className="fixed bottom-0 inset-x-0 rounded-t-2xl bg-white p-6"
            drag="y"
            dragConstraints={{ top: 0 }}
            style={{ y, opacity }}
            onDragEnd={(_, info) => {
              if (info.offset.y > 120 || info.velocity.y > 500) onClose()
            }}
            initial={safe.initial}
            animate={safe.animate}
            exit={safe.exit}
            transition={springs.gentle}
          >
            {loading ? (
              <div className="space-y-3">
                <ShimmerSkeleton className="h-4 w-3/4" />
                <ShimmerSkeleton className="h-4 w-1/2" />
                <ShimmerSkeleton className="h-20 w-full" />
              </div>
            ) : children}
          </motion.div>
        </>
      )}
    </AnimatePresence>
  )
}

Constraints / Non-Goals

This skill does not cover:

Token and spring definitions → see motion-foundations
Standard UI patterns (button, modal, stagger, page transitions) → see motion-patterns
CSS-only animations or Tailwind animate-* without motion/react
Canvas or WebGL-based animation (Three.js, Pixi, etc.)
Full drag-and-drop systems with external state managers (dnd-kit, react-beautiful-dnd)
Game-loop or frame-by-frame animation

Anti-Patterns

Anti-pattern	Rule violated	Fix
`drag` tested only on desktop	Rule 1	Test on touch emulator and real device
`animate={{ repeat: Infinity }}` with no pause	Rule 2	Add `visibilitychange` listener
`onDragEnd` checking only offset, not velocity	Rule 3	Check both `info.offset` and `info.velocity`
`animate(scope, ...)` before `useEffect`	Rule 4	Call `animate()` only after mount
`const x = new MotionValue(0)` in render	Rule 5	Use `const x = useMotionValue(0)`
`transition={{ duration: 1.2 }}` inline	Rule 6	Use `motionTokens.duration.crawl`
`useEffect` without cleanup	Rule 7	Return `removeEventListener` / `controls.stop`
SVG morph between paths with different commands	Rule 8	Normalize path commands before animating

Related Skills

`motion-foundations` — defines all tokens, springs, useSafeMotion, and SSR guards imported here. Must be set up before using this skill.
`motion-patterns` — handles standard UI patterns (button, modal, stagger, page transitions, scroll reveals). Use it before reaching for the advanced patterns here.

← v1.0.1 All versions