threeonecheck_web/unpackage/dist/dev/mp-weixin/components/hazardDetail/useHazardDetailScroll.js

"use strict";
const common_vendor = require("../../common/vendor.js");
const components_hazardDetail_hazardDetail = require("./hazardDetail.js");
function useHazardDetailScroll(detailSource, loadingSource) {
  const instance = common_vendor.getCurrentInstance();
  const queryScope = (instance == null ? void 0 : instance.proxy) || instance;
  const historyList = common_vendor.ref([]);
  const activeIndex = common_vendor.ref(0);
  const sectionOffsets = common_vendor.ref([0]);
  const contentViewHeight = common_vendor.ref(0);
  const contentScrollIntoView = common_vendor.ref("");
  const stepScrollIntoView = common_vendor.ref("");
  const scrollWithAnimation = common_vendor.ref(true);
  const isProgrammaticScroll = common_vendor.ref(false);
  let measureLayoutTimer = null;
  const measureLayout = () => {
    if (!historyList.value.length)
      return;
    common_vendor.nextTick$1(() => {
      const query = common_vendor.index.createSelectorQuery().in(queryScope);
      query.select(".content-scroll").boundingClientRect();
      query.select(".content-scroll").scrollOffset();
      query.selectAll(".node-section").boundingClientRect();
      query.exec((res) => {
        const containerRect = res == null ? void 0 : res[0];
        const scrollOffset = res == null ? void 0 : res[1];
        const sections = (res == null ? void 0 : res[2]) || [];
        if (!containerRect || !sections.length)
          return;
        contentViewHeight.value = containerRect.height || 0;
        const baseScrollTop = (scrollOffset == null ? void 0 : scrollOffset.scrollTop) || 0;
        sectionOffsets.value = sections.map(
          (section) => section.top - containerRect.top + baseScrollTop
        );
      });
    });
  };
  const scheduleMeasureLayout = () => {
    clearTimeout(measureLayoutTimer);
    measureLayoutTimer = setTimeout(() => {
      measureLayout();
    }, 80);
  };
  const rebuildHistory = (data) => {
    historyList.value = components_hazardDetail_hazardDetail.generateHazardHistory(data);
    activeIndex.value = 0;
    contentScrollIntoView.value = "";
    scheduleMeasureLayout();
    setTimeout(scheduleMeasureLayout, 300);
  };
  const syncActiveIndex = (scrollTop, scrollHeight = 0) => {
    const count = historyList.value.length;
    if (!count)
      return;
    if (scrollHeight > 0 && contentViewHeight.value > 0) {
      if (scrollTop + contentViewHeight.value >= scrollHeight - 60) {
        if (activeIndex.value !== count - 1) {
          activeIndex.value = count - 1;
        }
        return;
      }
    }
    const offsets = sectionOffsets.value;
    if (!offsets.length)
      return;
    let idx = 0;
    for (let i = offsets.length - 1; i >= 0; i--) {
      if (scrollTop >= offsets[i] - 80) {
        idx = i;
        break;
      }
    }
    if (idx !== activeIndex.value) {
      activeIndex.value = idx;
    }
  };
  const onContentScroll = (e) => {
    if (isProgrammaticScroll.value)
      return;
    const { scrollTop = 0, scrollHeight = 0 } = e.detail || {};
    syncActiveIndex(scrollTop, scrollHeight);
    scheduleMeasureLayout();
  };
  const onScrollToLower = () => {
    const count = historyList.value.length;
    if (count > 0 && activeIndex.value !== count - 1) {
      activeIndex.value = count - 1;
    }
  };
  const scrollToNode = (index) => {
    if (index < 0 || index >= historyList.value.length)
      return;
    isProgrammaticScroll.value = true;
    scrollWithAnimation.value = true;
    activeIndex.value = index;
    contentScrollIntoView.value = "hazard-node-" + index;
    setTimeout(() => {
      contentScrollIntoView.value = "";
      isProgrammaticScroll.value = false;
      scheduleMeasureLayout();
    }, 350);
  };
  common_vendor.watch(
    () => typeof loadingSource === "function" ? loadingSource() : loadingSource == null ? void 0 : loadingSource.value,
    (loading) => {
      if (!loading) {
        scheduleMeasureLayout();
        setTimeout(scheduleMeasureLayout, 300);
      }
    }
  );
  common_vendor.watch(
    () => typeof detailSource === "function" ? detailSource() : detailSource == null ? void 0 : detailSource.value,
    (val) => rebuildHistory(val),
    { immediate: true, deep: true }
  );
  common_vendor.watch(activeIndex, (index) => {
    stepScrollIntoView.value = "hazard-step-" + index;
    setTimeout(() => {
      stepScrollIntoView.value = "";
    }, 300);
  });
  common_vendor.watch(
    () => historyList.value.length,
    () => scheduleMeasureLayout()
  );
  common_vendor.onReady(() => {
    scheduleMeasureLayout();
    setTimeout(scheduleMeasureLayout, 300);
  });
  return {
    historyList,
    activeIndex,
    contentScrollIntoView,
    stepScrollIntoView,
    scrollWithAnimation,
    onContentScroll,
    onScrollToLower,
    scrollToNode,
    scheduleMeasureLayout
  };
}
exports.useHazardDetailScroll = useHazardDetailScroll;
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