vue-music 使用better-scroll遇到轮播图不能自动轮播

Posted 2020-11-09 shengnan_2017

根据vue-music视频中slider组建的使用，当安装新版本的better-scroll，轮播组件，不能正常轮播

这是因为，better-scroll发布新版本之后，参数设置发生改变

这是旧版本： 组件为slider

<template>
  <div class="slider" ref="slider">
    <div class="slider-group" ref="sliderGroup">
      <slot>
      </slot>
    </div>
    <div class="dots">
      <span class="dot" :class="{active: currentPageIndex === index }" v-for="(item, index) in dots" :key="item.id"></span>
    </div>
  </div>
</template>

<script type="text/ecmascript-6">
import { addClass } from "common/js/dom";
import BScroll from "better-scroll";

export default {
  name: "slider",
  props: {
    loop: {
      type: Boolean,
      default: true
    },
    autoPlay: {
      type: Boolean,
      default: true
    },
    interval: {
      type: Number,
      default: 4000
    }
  },
  data() {
    return {
      dots: [],
      currentPageIndex: 0
    };
  },
  mounted() {
    setTimeout(() => {
      this._setSliderWidth();
      this._initDots();
      this._initSlider();

      if (this.autoPlay) {
        this._play();
      }
    }, 20);

    window.addEventListener("resize", () => {
      if (!this.slider) {
        return;
      }
      this._setSliderWidth(true);
      this.slider.refresh();
    });
  },
  activated() {
    if (this.autoPlay) {
      this._play();
    }
  },
  deactivated() {
    clearTimeout(this.timer);
  },
  beforeDestroy() {
    clearTimeout(this.timer);
  },
  methods: {
    _setSliderWidth(isResize) {
      this.children = this.$refs.sliderGroup.children;

      let width = 0;
      let sliderWidth = this.$refs.slider.clientWidth;
      for (let i = 0; i < this.children.length; i++) {
        let child = this.children[i];
        addClass(child, "slider-item");

        child.style.width = sliderWidth + "px";
        width += sliderWidth;
      }
      if (this.loop && !isResize) {
        width += 2 * sliderWidth;
      }
      this.$refs.sliderGroup.style.width = width + "px";
    },
    _initSlider() {
      // better-scroll 对外暴露了一个 BScroll 的类
      // Vue.js 提供了我们一个获取 DOM 对象的接口—— vm.$refs
      this.slider = new BScroll(this.$refs.slider, {
        scrollX: true,
        scrollY: false,
        momentum: false,
        snap: true,
        snapLoop: this.loop,
        snapThreshold: 0.3,
        snapSpeed: 400
      });
     // 是否派发滚动到底部事件，用于上拉加载
    //  切换到下一张的时候派发的事件
      this.slider.on("scrollEnd", () => {
        let pageIndex = this.slider.getCurrentPage().pageX;
        if (this.loop) {
          pageIndex -= 1;
        }
        this.currentPageIndex = pageIndex;

        if (this.autoPlay) {
          this._play();
        }
      });
     // 是否派发列表滚动开始的事件
      this.slider.on("beforeScrollStart", () => {
        if (this.autoPlay) {
          clearTimeout(this.timer);
        }
      });
    },
    _initDots() {
      this.dots = new Array(this.children.length);
    },
    _play() {
      let pageIndex = this.currentPageIndex + 1;
      if (this.loop) {
        pageIndex += 1;
      }
      this.timer = setTimeout(() => {
        this.slider.goToPage(pageIndex, 0, 400);
      }, this.interval);
    }
  }
};
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
@import \'~common/stylus/variable\';

.slider {
  min-height: 1px;

  .slider-group {
    position: relative;
    overflow: hidden;
    white-space: nowrap;

    .slider-item {
      float: left;
      box-sizing: border-box;
      overflow: hidden;
      text-align: center;

      a {
        display: block;
        width: 100%;
        overflow: hidden;
        text-decoration: none;
      }

      img {
        display: block;
        width: 100%;
      }
    }
  }

  .dots {
    position: absolute;
    right: 0;
    left: 0;
    bottom: 12px;
    text-align: center;
    font-size: 0;

    .dot {
      display: inline-block;
      margin: 0 4px;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: $color-text-l;

      &.active {
        width: 20px;
        border-radius: 5px;
        background: $color-text-ll;
      }
    }
  }
}
</style>

 

 

下面是版本升级之后，做出的变化

<template>
    <div class="slide" ref="slide">
        <div class="slide-group" ref="slideGroup">
            <slot>
            </slot>
        </div>
        <div v-if="showDot" class="dots">
            <span class="dot" :class="{active: currentPageIndex === index }" v-for="(item, index) in dots" :key="index"></span>
        </div>
    </div>
</template>

<script type="text/ecmascript-6">
import { addClass } from "common/js/dom";
import BScroll from "better-scroll";
// const COMPONENT_NAME = "slide";
export default {
//   name: COMPONENT_NAME,
  props: {
    loop: {
      type: Boolean,
      default: true
    },
    autoPlay: {
      type: Boolean,
      default: true
    },
    interval: {
      type: Number,
      default: 4000
    },
    showDot: {
      type: Boolean,
      default: true
    },
    click: {
      type: Boolean,
      default: true
    },
    threshold: {
      type: Number,
      default: 0.3
    },
    speed: {
      type: Number,
      default: 400
    }
  },
  data() {
    return {
      dots: [],
      currentPageIndex: 0
    };
  },
  mounted() {
    this.update();
    window.addEventListener("resize", () => {
      if (!this.slide || !this.slide.enabled) {
        return;
      }
      clearTimeout(this.resizeTimer);
      this.resizeTimer = setTimeout(() => {
        if (this.slide.isInTransition) {
          this._onScrollEnd();
        } else {
          if (this.autoPlay) {
            this._play();
          }
        }
        this.refresh();
      }, 60);
    });
  },
  activated() {
    if (!this.slide) {
      return;
    }
    this.slide.enable();
    let pageIndex = this.slide.getCurrentPage().pageX;
    this.slide.goToPage(pageIndex, 0, 0);
    this.currentPageIndex = pageIndex;
    if (this.autoPlay) {
      this._play();
    }
  },
  deactivated() {
    this.slide.disable();
    clearTimeout(this.timer);
  },
  beforeDestroy() {
    this.slide.disable();
    clearTimeout(this.timer);
  },
  methods: {
    update() {
      if (this.slide) {
        this.slide.destroy();
      }
      this.$nextTick(() => {
        this.init();
      });
    },
    refresh() {
      this._setSlideWidth(true);
      this.slide.refresh();
    },
    prev() {
      this.slide.prev();
    },
    next() {
      this.slide.next();
    },
    init() {
      clearTimeout(this.timer);
      this.currentPageIndex = 0;
      this._setSlideWidth();
      if (this.showDot) {
        this._initDots();
      }
      this._initSlide();
      if (this.autoPlay) {
        this._play();
      }
    },
    _setSlideWidth(isResize) {
      this.children = this.$refs.slideGroup.children;
      let width = 0;
      let slideWidth = this.$refs.slide.clientWidth;
      for (let i = 0; i < this.children.length; i++) {
        let child = this.children[i];
        addClass(child, "slide-item");
        child.style.width = slideWidth + "px";
        width += slideWidth;
      }
      if (this.loop && !isResize) {
        width += 2 * slideWidth;
      }
      this.$refs.slideGroup.style.width = width + "px";
    },
    _initSlide() {
      console.log(this.threshold);
      this.slide = new BScroll(this.$refs.slide, {
        scrollX: true,
        scrollY: false,
        momentum: false,
        snap: {
          loop: this.loop,
          threshold: th
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