foton-laws-system-front/src/components/hzwlComponents/phone/PhoneScroll.vue

<template>
  <div class="scroll-wrapper" ref="scroll" :style="{height: height}">
    <div class="scroll-content" ref="content">
      <!-- 下拉刷新 -->
      <template v-if="pullDownRefresh">
        <div v-if="pullDown" class="pullDownText">
          <span v-if="isEnterThreshold">下拉刷新</span>
          <span v-if="isLeaveThreshold">松开刷新</span>
          <van-loading
              v-if="pullDownLoading"
              type="spinner"
              size="16px"
              text-size="12px"
              color="#3170A8"
              style="text-align: center"
          >加载中...</van-loading>
        </div>
      </template>

      <!-- 除上拉和下拉之外的loading -->
      <van-loading
          v-if="loading && !pullDownLoading && !pullUpLoading"
          class="pageLoading"
          type="spinner"
          size="16px"
          text-size="12px"
          color="#3170A8"
          style="text-align: center"
      >加载中...</van-loading>

      <slot></slot>

      <!-- 上拉加载 -->
      <template v-if="pullUpLoad">
        <van-loading
            v-if="pullUpLoading"
            type="spinner"
            size="16px"
            text-size="12px"
            color="#3170A8"
            style="text-align: center"
        >加载中...</van-loading>
        <template v-else>
          <div v-if="isShowAll" style="font-size: 12px;text-align: center;color: #999">已加载全部数据</div>
          <van-empty v-if="isEmpty" description="暂无数据" />
        </template>
      </template>
    </div>
  </div>
</template>

<script>
import BScroll from '@better-scroll/core'
import ScrollBar from '@better-scroll/scroll-bar'
import Pullup from '@better-scroll/pull-up'
import PullDown from '@better-scroll/pull-down'

BScroll.use(ScrollBar)
BScroll.use(Pullup)
BScroll.use(PullDown)

export default {
  name: "PhoneScroll",
  props: {
    // 容器wrapper高度
    height: {
      type: String,
      default: '100%'
    },
    data: {
      type: Array,
      default: () => [],
      required: true
    },
    page: {
      type: Number,
      required: true
    },
    pageSize: {
      type: Number,
      required: true
    },
    // 总数
    total: {
      type: Number,
      required: true
    },
    // 除上拉和下拉之外的loading
    loading: {
      type: Boolean,
      default: false
    },

    // 是否开启上拉加载
    pullUpLoad: {
      type: Boolean,
      default: false
    },
    // 是否开启下拉刷新
    pullDownRefresh: {
      type: Boolean,
      default: false
    },

    // 获取数据回调 返回值必须是Promise
    getDataHandler: {
      type: Function,
      default: (page) => {
        console.log('请传入获取数据回调函数参数getDataHandler', page)
        return Promise.resolve()
      }
    },
  },
  data () {
    return {
      bs: null,

      // 下拉刷新
      pullDown: false,
      isEnterThreshold: false,
      isLeaveThreshold: false,
      pullDownLoading: false,

      // 上拉加载
      pullUpLoading: false,
      isShowAll: false,
      isEmpty: false,
    }
  },
  watch: {
    data() {
      this.refreshScroll()
    }
  },
  methods: {
    refreshScroll () {
      this.$nextTick(() => {
        if (!this.bs) {
          const pullUpLoad = this.pullUpLoad ? {
            threshold: 200
          } : false
          const pullDownRefresh = this.pullDownRefresh ? {
              threshold: 50,
              stop: 40
            } : false
          this.bs = new BScroll(this.$refs.scroll, {
            probeType: 3,
            scrollbar: true,
            pullUpLoad,
            pullDownRefresh,
            click: true
          })

          if (this.pullUpLoad) {
            this.bs.on('pullingUp', this.pullingUpHandler)
          }

          if (this.pullDownRefresh) {
            this.bs.on('pullingDown', this.pullingDownHandler)

            this.bs.on('enterThreshold', () => {
              this.showPullDownText('isEnterThreshold')
            })

            this.bs.on('leaveThreshold', () => {
              this.showPullDownText('isLeaveThreshold')
            })
          }

          this.bs.on('scroll', ({x, y}) => { })

        } else {
          this.bs.refresh()
        }
      })
    },

    // 上拉加载回调
    async pullingUpHandler () {
      if (this.page * this.pageSize <= this.total) {
        this.pullUpLoading = true
        // 从下一页获取数据
        await this.getDataHandler(this.page + 1)
        this.pullUpLoading = false
      }
      this.showPullUpText()
      // 结束上拉加载
      this.bs.finishPullUp()
    },

    // 下拉刷新回调
    async pullingDownHandler () {
      this.showPullDownText('pullDownLoading')

      // 从第一页获取数据
      await this.getDataHandler(1)

      this.hidePullDownText()
      // 结束下拉刷新
      this.bs.finishPullDown()
    },

    showPullUpText () {
      this.isEmpty = false
      this.isShowAll = false
      if (this.data.length === 0) {
        this.isEmpty = true
      } else {
        if (this.data.length >= this.total) {
          this.isShowAll = true
        }
      }
    },
    showPullDownText (key) {
      this.isEnterThreshold = false
      this.isLeaveThreshold = false
      this.pullDownLoading = false
      this[key] = true
      this.pullDown = true
    },
    hidePullDownText () {
      this.isEnterThreshold = false
      this.isLeaveThreshold = false
      this.pullDownLoading = false
      this.pullDown = false
    },
    scrollTo (x, y ,time, easing) {
      if (this.bs) {
        this.bs.scrollTo(x, y, time, easing)
      }
    }
  }
}
</script>

<style scoped>
.scroll-wrapper {
  /*height: calc(100vh - 131px);*/
  overflow: hidden;
  position: relative;
}

.pageLoading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.pullDownText {
  position: absolute;
  text-align: center;
  pointer-events: auto;
  height: 40px;
  line-height: 40px;
  top: -40px;
  width: 100%;
  left: 0;
  font-size: 12px;
  color: #3170A8;
}
</style>