Animating Content With React Spring

December 24, 2021

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class TransitionArray extends PureComponent {
  constructor() {
    super()

    this.state = {
      items: NUM_TRANS
    }
  }

  componentDidUpdate(_, prevState) {
    const { items: currItems } = this.state
    const { items: prevItems } = prevState

    if (currItems.length === 0 && prevItems.length !== currItems.length) {
      setTimeout(() => {
        this.setState({
          items: NUM_TRANS
        })
      }, 2000)
    }
  }

  render() {
    return (
      <div style={{ display: "flex" }}>
        <Transition
          items={this.state.items}
          from={{ opacity: 0 }}
          enter={{ opacity: 1 }}
          leave={{ opacity: 0 }}
          delay={200}
          config={config.molasses}
          onRest={() => this.setState({ items: [] })}>
          {({ opacity }, item) => (
            <animated.div
              style={{
                opacity: opacity.to(item.op),
                transform: opacity
                  .to(item.trans)
                  .to((y) => `translate3d(0,${y}px,0)`)
              }}>
              {item.fig}
            </animated.div>
          )}
        </Transition>
      </div>
    )
  }
}