React-Springでリッチなアニメーション

Transcript

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8. import { render } from 'react-dom' import React, { useState

   } from 'react' import { useSpring, animated as a } from 'react-spring' import './styles.css' function Card() { const [flipped, set] = useState(false) const { transform, opacity } = useSpring({ opacity: flipped ? 1 : 0, transform: `perspective(600px) rotateX(${flipped ? 180 : 0}deg)`, config: { mass: 5, tension: 500, friction: 80 } }) return ( <div onClick={() => set(state => !state)}> <a.div class="c back" style={{ opacity: opacity.interpolate(o => 1 - o), transform }} /> <a.div class="c front" style={{ opacity, transform: transform.interpolate(t => `${t} rotateX(180deg)`) }} /> </div> ) }

9. https://codesandbox.io/embed/01yl7knw70

10. import React from 'react' import ReactDOM from 'react-dom' import {

    useSpring, animated } from 'react-spring' import './styles.css' // // Icons made by Freepik from www.flaticon.com const calc = (x, y) => [x - window.innerWidth / 2, y - window.innerHeight / 2] const trans1 = (x, y) => `translate3d(${x / 10}px,${y / 10}px,0)` const trans2 = (x, y) => `translate3d(${x / 8 + 35}px,${y / 8 - 230}px,0)` const trans3 = (x, y) => `translate3d(${x / 6 - 250}px,${y / 6 - 200}px,0)` const trans4 = (x, y) => `translate3d(${x / 3.5}px,${y / 3.5}px,0)` function Card() { const [props, set] = useSpring(() => ({ xy: [0, 0], config: { mass: 10, tension: 550, friction: 140 } })) return ( <div class="container" onMouseMove={({ clientX: x, clientY: y }) => set({ xy: calc(x, y) })}> <animated.div class="card1" style={{ transform: props.xy.interpolate(trans1) }} /> <animated.div class="card2" style={{ transform: props.xy.interpolate(trans2) }} /> <animated.div class="card3" style={{ transform: props.xy.interpolate(trans3) }} /> <animated.div class="card4" style={{ transform: props.xy.interpolate(trans4) }} /> </div> ) }

11. https://codesandbox.io/embed/r5x34869vq

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14. const props = useSpring({opacity: toggle ? 1 : 0}) return

    <animated.div style={props}>i will fade</animated.div> useSpring

15. const [show, set] = useState(false) const transitions = useTransition(show, null,

    { from: { position: 'absolute', opacity: 0 }, enter: { opacity: 1 }, leave: { opacity: 0 }, }) return transitions.map(({ item, key, props }) => item && <animated.div key={key} style={props}>✌</animated.div> ) useTransition

16. const trail = useTrail(3, {opacity: 1}) return trail.map(props => <animated.div

    style={props} />) useTrail https://codesandbox.io/embed/8zx4ppk01l

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