javascript - 每张幻灯片的水平 ScrollMagic 容器中的视差内容断断续续

Question

我有一个固定的 slider ，当您通过更新内部包装器的 X 值到达它时，它会水平移动。这部分效果很好。

但是，对于每张单独的幻灯片，我希望文本具有视差效果(滚动时速度变慢 - 相对于当前幻灯片)。

这是我设置的一个小型(简化)测试用例: https://codepen.io/michaelpumo/pen/EJgWgd

不幸的是，出于某种原因，文本似乎交错并且动画不流畅。这可能是我误解了 ScrollMagic 的 API(它对我来说是新的)。

我有 2 个 Controller ，因为获得“视差”部分的唯一方法是将第二个 Controller 设置为 vertical: false。也许与此有关？

非常感谢您的帮助!

JavaScript

const ease = window.Power4.easeInOut
const el = document.querySelector('#el')
const wrapper = document.querySelector('#wrapper')
const slides = el.querySelectorAll('.El__slide')
const amount = slides.length
const controller = new window.ScrollMagic.Controller()
const horizontalMovement = new window.TimelineMax()

const controller2 = new window.ScrollMagic.Controller({
  vertical: false
})

horizontalMovement
  .add([
    window.TweenMax.to(wrapper, 1, {
      x: `-${(100 / amount) * (amount - 1)}%`
    })
  ])

new window.ScrollMagic.Scene({
    triggerElement: el,
    triggerHook: 'onLeave',
    duration: `${amount * 100}%`
  })
  .setPin(el)
  .setTween(horizontalMovement)
  .addTo(controller)

slides.forEach((item, index) => {
  const title = item.querySelector('h1')
  const subtitle = item.querySelector('h2')
  const tween = new window.TimelineMax()

  tween
    .fromTo(title, 1, { x: 0 }, { x: 500 }, 0)
    .fromTo(subtitle, 1, { x: 600 }, { x: 500 }, 0)

  new window.ScrollMagic.Scene({
      triggerElement: item,
      triggerHook: 1,
      duration: '100%'
    })
    .setTween(tween)
    .addTo(controller2)
})

SCSS

.El {
  width: 100%;
  max-width: 100%;
  overflow: hidden;
  &__wrapper {
    display: flex;
    width: 400vw;
    height: 100vh;
  }
  &__slide {
    display: flex;
    align-items: center;
    width: 100vw;
    padding: 50px;
    &:nth-child(1) {
      background-color: salmon;
    }
    &:nth-child(2) {
      background-color: blue;
    }
    &:nth-child(3) {
      background-color: orange;
    }
    &:nth-child(4) {
      background-color: tomato;
    }
  }
  &__content {
    width: 100%;
  }
  &__title,
  &__subtitle {
    position: relative;
  }
}

HTML

<div id="el" class="El">
  <div id="wrapper" class="El__wrapper">
    <div class="El__slide">
      <div class="El__content">
        <h1 class="El__title">Title A</h1>
        <h2 class="El__subtitle">Subtitle A</h2>
      </div>
    </div>
    <div class="El__slide">
      <div class="El__content">
        <h1 class="El__title">Title B</h1>
        <h2 class="El__subtitle">Subtitle B</h2>
      </div>
    </div>
    <div class="El__slide">
      <div class="El__content">
        <h1 class="El__title">Title C</h1>
        <h2 class="El__subtitle">Subtitle C</h2>
      </div>
    </div>
    <div class="El__slide">
      <div class="El__content">
        <h1 class="El__title">Title D</h1>
        <h2 class="El__subtitle">Subtitle D</h2>
      </div>
    </div>
  </div>
</div>

Answer 1

要使用 ScrollMagic 方法获得所需的效果，您必须将 refreshInterval: 1 设置为 controller2。

文档:http://scrollmagic.io/docs/ScrollMagic.Controller.html#constructor

示例:https://codepen.io/biomagic/pen/dLgzJO

const ease = window.Power4.easeInOut
const el = document.querySelector('#el')
const wrapper = document.querySelector('#wrapper')
const slides = el.querySelectorAll('.El__slide')
const amount = slides.length
const controller = new window.ScrollMagic.Controller()
const horizontalMovement = new window.TimelineMax()

const controller2 = new window.ScrollMagic.Controller({
  vertical: false,
  refreshInterval: 1
})

horizontalMovement
  .add([
    window.TweenMax.to(wrapper, 1, { x: `-${(100 / amount) * (amount - 1)}%` })
  ])

new window.ScrollMagic.Scene({
  triggerElement: el,
  triggerHook: 'onLeave',
  duration: `${amount * 100}%`
})
  .setPin(el)
  .setTween(horizontalMovement)
  .addTo(controller)

slides.forEach((item, index) => {
  const title = item.querySelector('h1')
  const subtitle = item.querySelector('h2')
  const tween = new window.TimelineMax()
  tween
    .fromTo(title, 1, { x: 0 }, { x: 500 }, 0)
    .fromTo(subtitle, 1, { x: 600 }, { x: 500 }, 0)
  new window.ScrollMagic.Scene({
    triggerElement: item,
    triggerHook: 1,
    duration: '100%'
  })
  .setTween(tween)
  .addTo(controller2)
})

另一种方法。您可以将 tweenChanges: true 添加到您的场景中。

文档:http://scrollmagic.io/docs/animation.GSAP.html#newScrollMagic.Sceneoptions

示例:https://codepen.io/biomagic/pen/rbqpMb

const ease = window.Power4.easeInOut
const el = document.querySelector('#el')
const wrapper = document.querySelector('#wrapper')
const slides = el.querySelectorAll('.El__slide')
const amount = slides.length
const controller = new window.ScrollMagic.Controller()
const horizontalMovement = new window.TimelineMax()

const controller2 = new window.ScrollMagic.Controller({
  vertical: false
})

horizontalMovement
  .add([
    window.TweenMax.to(wrapper, 1, { x: `-${(100 / amount) * (amount - 1)}%` })
  ])

new window.ScrollMagic.Scene({
  triggerElement: el,
  triggerHook: 'onLeave',
  duration: `${amount * 100}%`
})
  .setPin(el)
  .setTween(horizontalMovement)
  .addTo(controller)

slides.forEach((item, index) => {
  const title = item.querySelector('h1')
  const subtitle = item.querySelector('h2')
  const tween = new window.TimelineMax()
  tween
    .fromTo(title, 1, { x: 0 }, { x: 500 }, 0)
    .fromTo(subtitle, 1, { x: 600 }, { x: 500 }, 0)
  new window.ScrollMagic.Scene({
    triggerElement: item,
    triggerHook: 1,
    duration: '100%',
    tweenChanges: true
  })
  .setTween(tween)
  .addTo(controller2)
})