Vue3——区域内无限滚动

1. 新建组件RegionRoll.vue

<template>
  <div :style="noticeStyle" ref="noticeDivRef">
    <span ref="noticeRef" class="notice-span" :style="noticeSpanStyle">{{ props.text }}</span>
  </div>
</template>
<script setup lang="ts">
import { computed, defineProps, onMounted, ref, nextTick, watch } from 'vue'

const props = defineProps({
  /* 区域宽度(默认200px) */
  w: {
    type: String,
    default: '200px'
  },
  /* 区域高度(默认20px) */
  h: {
    type: String,
    default: '20px'
  },
  /* 区域文本 */
  text: {
    type: String
  },
  /* 过渡速度(默认30,值越大速度越快) */
  speed: {
    type: Number,
    default: 30
  },
  /* 是否默认滚动(默认否) */
  isDefaultRoll: {
    type: Boolean,
    default: false
  }
})
const noticeSpanStyle = ref({})
const noticeRef = ref<HTMLElement>()
const noticeDivRef = ref<HTMLElement>()

const noticeStyle = computed<{}>(() => {
  return {
    width: props.w,
    'white-space': 'nowrap',
    overflow: 'hidden',
    position: 'relative',
    height: props.h
  }
})

onMounted(() => {
  noticeSpanStyle.value = {
    left: `100%`,
    transition: '0s'
  }
})

const setAni = (width) => {
  const delay = width / props.speed
  noticeSpanStyle.value = {
    left: `-${width}px`,
    transition: `${delay}s linear`
  }
  setTimeout(() => {
    noticeSpanStyle.value = {
      left: `100%`,
      transition: `0s linear`
    }
    nextTick(() => {
      setAni(noticeRef.value?.offsetWidth)
    })
  }, delay * 1000)
}

watch(
  () => props.text,
  () => {
    nextTick(() => {
      let spanW = noticeRef.value?.offsetWidth || 0
      let divW = noticeDivRef.value?.offsetWidth || 0
      if (spanW <= divW && !props.isDefaultRoll) {
        noticeSpanStyle.value = {
          left: `0px`,
          transition: '0s'
        }
        return
      }
      setAni(spanW)
    })
  }
)
</script>

<style scoped>
.notice-span {
  position: absolute;
}
</style>

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2. 使用

<script setup lang="ts">
import { ref } from 'vue'
import RegionRoll from '@/components/RegionRoll.vue'
const noticeText = ref('我是文本-我是文本-我是文本-我是文本-我是文本-我是文本-我是文本')
</script>

<template>
  <RegionRoll w="100%" :text="noticeText" />
</template>

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