tav-ui/lib/packages/hooks/event/useKeepScroll2.js

Tav UI

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var vue = require('vue');

function useKeepScroll(keepScrollOpt) {
  if (!keepScrollOpt.scrollEl && (!keepScrollOpt.getScrollTop || !keepScrollOpt.setScrollTop))
    throw new Error("invalid params!");
  let scrollTop = 0;
  const getScrollTop = keepScrollOpt.getScrollTop ?? function() {
    return keepScrollOpt.scrollEl.scrollTop;
  };
  const setScrollTop = keepScrollOpt.setScrollTop ?? function(value) {
    keepScrollOpt.scrollEl.scrollTop = value;
  };
  function onScroll() {
    scrollTop = getScrollTop();
  }
  const scrollFn = () => {
    setScrollTop(scrollTop);
  };
  scrollFn();
  if (keepScrollOpt.scrollEl) {
    keepScrollOpt.scrollEl.addEventListener("scroll", onScroll);
    vue.onBeforeUnmount(() => {
      keepScrollOpt.scrollEl?.removeEventListener("scroll", onScroll);
    });
  }
  return { onScroll, scrollFn, scrollTop };
}

exports.useKeepScroll = useKeepScroll;
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