vue实现滑动切换效果(仅在手机模式下可用)

tjzc1352640 0 条评论 2020-06-29 15:02

本文实例为大家分享了vue实现滑动时红黄色块左右滑动相应距离,效果如下图

实现过程主要在于实时跟踪手指滑动位置与原位置之间的偏移量,再相应移动红黄块。

红黄块布局如下

back中包含back-l,back-r左右两块,正常情况下为了隐藏其中一块,子模块需要设置display: inline-block,并且宽度都需要设置width: 100%。父模块中设置white-space: nowrap用于处理两个子模块之间的空白。

<template lang="html">
 <div class="back"
 @touchstart.prevent="touchStart"
 @touchmove.prevent="touchMove"
 @touchend="touchEnd" ref="back">
 <div class="back-l" ref="left"></div>
 <div class="back-r" ref="right"></div>
 </div>
</template>
 
<style scoped lang="stylus" rel="stylesheet/stylus">
.back
 position: fixed
 width: 100%
 height: 100px
 white-space: nowrap
 .back-l
 position: relative
 vertical-align: top
 display: inline-block
 width: 100%
 height: 100%
 background-color: red
 .back-r
 display: inline-block
 vertical-align: top
 position: relative
 width: 100%
 height: 100%
 background-color: yellow
</style>

父模块监听滑动事件

滑动事件分为三种:touchstart,touchmove,touchEnd,加上prevent避免页面相应滑动。

在touchstart中记录滑动开始点:

touchStart(e) {
  const touch = e.touches[0]
  this.touch.startX = touch.pageX
  this.touch.startY = touch.pageY
 }

touchmove中为滑动过程,手指未离开页面,离开页面时触发touchend。滑动过程中,当横向偏离位置大于纵向偏离位置时认为滑动有效,记录手指偏离位置,相应移动红黄块。

touchMove(e) {
  console.log("move");
  const touch = e.touches[0]
  //横向和纵向偏离位置
  const deltaX = touch.pageX - this.touch.startX
  const deltaY = touch.pageY - this.touch.startY
  if (Math.abs(deltaY) > Math.abs(deltaX)) {
  return
  }
  const left = this.currentPlay == 'red' ? 0 : -window.innerWidth
  var offsetWidth = Math.min(0, Math.max(-window.innerWidth,left+deltaX))
  //记录滑动的距离占屏幕宽度的百分比,如果滑动太少则不切换
  this.percent = Math.abs(offsetWidth/window.innerWidth)
  //移动红黄块  
  this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)`
  //设置动画时间  
  this.$refs.back.style["transitionDuration"] = 10
 }

计算偏移量时首先需要知道当前偏移位置,如果当前在红块,初始偏移量为0,否则初始偏移量为负的屏幕宽度。初始偏移量加上横向偏移量首先和-window.innerWidth取最大值,-window.innerWidth为最左偏移量。再和0相比较取最小值,偏移量为0或者大于零则不再(向右移动)移动,小于零则可以向左移动。

touchend中处理最终效果,如果滑动距离不大于某一值则恢复原位,否则切换。

touchEnd() {
 console.log("end");
 console.log(this.percent);
 let offsetWidth
 let percent
 //当前为红色,滑动占比大于0.1则切换,否则回到原位置
 if(this.currentPlay === 'red'){
 if(this.percent > 0.1) {
  this.currentPlay = 'yellow'
  offsetWidth = -window.innerWidth
 } else {
  offsetWidth = 0
 }
 } else {
 //当前为黄色,滑动占比大于0.9则切换,否则回到原位置
 if(this.percent < 0.9) {
  this.currentPlay = 'red'
  offsetWidth = 0
 } else {
  offsetWidth = -window.innerWidth
 }
 }
 //这里的transform是针对最开始的位置而言,而不是移动过程中的位置
 this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)`
 this.$refs.back.style["transitionDuration"] = 10
}

完整代码

<template lang="html">
 <div class="back"
 @touchstart.prevent="touchStart" @touchmove.prevent="touchMove"
 @touchend="touchEnd" ref="back">
 <div class="back-l" ref="left"></div>
 <div class="back-r" ref="right"></div>
 
 </div>
</template>
 
<script>
export default {
 data() {
 return {
  currentPlay: 'red',
  percent: 0
 }
 },
 created() {
 this.touch = {}
 },
 methods: {
 touchStart(e) {
  const touch = e.touches[0]
  this.touch.startX = touch.pageX
  this.touch.startY = touch.pageY
 },
 touchMove(e) {
  console.log("move");
  const touch = e.touches[0]
  const deltaX = touch.pageX - this.touch.startX
  const deltaY = touch.pageY - this.touch.startY
  if (Math.abs(deltaY) > Math.abs(deltaX)) {
  return
  }
  const left = this.currentPlay == 'red' ? 0 : -window.innerWidth
  var offsetWidth = Math.min(0, Math.max(-window.innerWidth,left+deltaX))
  this.percent = Math.abs(offsetWidth/window.innerWidth)
  this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)`
  this.$refs.back.style["transitionDuration"] = 10
 
 
 
 },
 touchEnd() {
  console.log("end");
  console.log(this.percent);
  let offsetWidth
  let percent
  if(this.currentPlay === 'red'){
  if(this.percent > 0.1) {
   this.currentPlay = 'yellow'
   offsetWidth = -window.innerWidth
  } else {
   offsetWidth = 0
  }
  } else {
  if(this.percent < 0.9) {
   this.currentPlay = 'red'
   offsetWidth = 0
  } else {
   offsetWidth = -window.innerWidth
  }
  }
  this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)`
  this.$refs.back.style["transitionDuration"] = 10
 }
 }
}
</script>
 
<style scoped lang="stylus" rel="stylesheet/stylus">
.back
 position: fixed
 width: 100%
 height: 100px
 white-space: nowrap
 .back-l
 position: relative
 vertical-align: top
 display: inline-block
 width: 100%
 height: 100%
 background-color: red
 .back-r
 display: inline-block
 vertical-align: top
 position: relative
 width: 100%
 height: 100%
 background-color: yellow
 
 
</style>

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