<template>
  <div ref="wrapper">
    <slot></slot>
  </div>
</template>

<script type="text/ecmascript-6">
import BScroll from "better-scroll";
export default {
  props: {
    probeType: {
      type: Number,
      default: 1
    },
    click: {
      type: Boolean,
      default: true
    },
    listenScroll: {
      type: Boolean,
      default: false
    },
    data: {
      type: Array,
      default: null
    },
    pullup: {
      type: Boolean,
      default: false
    },
    pulldown: {
      type: Boolean,
      default: false
    },
    beforeScroll: {
      type: Boolean,
      default: false
    },
    refreshDelay: {
      type: Number,
      default: 100
    },
    bounce: {
      type: Boolean,
      default: true
    },
    scrollX: {
      type: Boolean,
      default: false
    },
    scrollY: {
      type: Boolean,
      default: true
    }
  },
  mounted() {
    setTimeout(() => {
      this._initScroll();
    }, 20);
  },
  methods: {
    _initScroll() {
      if (!this.$refs.wrapper) {
        return;
      }
      this.scroll = new BScroll(this.$refs.wrapper, {
        probeType: this.probeType,
        click: this.click,
        bounce: this.bounce,
        scrollX: this.scrollX,
        scrollY: this.scrollY
      });

      if (this.listenScroll) {
        let me = this;
        this.scroll.on("scroll", pos => {
          me.$emit("scroll", pos);
        });
      }

      if (this.pullup) {
        this.scroll.on("scrollEnd", () => {
          if (this.scroll.y <= this.scroll.maxScrollY + 10) {
            // 滚动到底部
            this.$emit("pullup");
          }
        });
      }
      if (this.pulldown) {
        this.scroll.on("touchend", pos => {
          // 下拉动作
          if (pos.y > 50) {
            this.$emit("pulldown");
          }
        });
      }
      if (this.beforeScroll) {
        this.scroll.on("beforeScrollStart", () => {
          this.$emit("beforeScroll");
        });
      }
      // if (this.pos) {
      //   // this.$emit('beforeScroll')
      //   this.scroll.scrollTo(this.pos.x,this.pos.y)
      // }
    },
    disable() {
      this.scroll && this.scroll.disable();
    },
    enable() {
      this.scroll && this.scroll.enable();
    },
    refresh() {
      this.scroll && this.scroll.refresh();
    },
    scrollTo(x, y, time) {
      this.scroll && this.scroll.scrollTo(x, y, time);
    },
    scrollToElement(el, time) {
      this.scroll && this.scroll.scrollToElement(el, time);
    },
    scrollToElement() {
      this.scroll && this.scroll.scrollToElement.apply(this.scroll, arguments);
    }
  },
  watch: {
    data() {
      setTimeout(() => {
        this.refresh();
      }, this.refreshDelay);
    }
  }
};
</script>

<style scoped >
</style>