InternshipProject/node_modules/rc-virtual-list/lib/hooks/useOriginScroll.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _react = require("react");

var _default = function _default(isScrollAtTop, isScrollAtBottom) {
  // Do lock for a wheel when scrolling
  var lockRef = (0, _react.useRef)(false);
  var lockTimeoutRef = (0, _react.useRef)(null);

  function lockScroll() {
    clearTimeout(lockTimeoutRef.current);
    lockRef.current = true;
    lockTimeoutRef.current = setTimeout(function () {
      lockRef.current = false;
    }, 50);
  } // Pass to ref since global add is in closure


  var scrollPingRef = (0, _react.useRef)({
    top: isScrollAtTop,
    bottom: isScrollAtBottom
  });
  scrollPingRef.current.top = isScrollAtTop;
  scrollPingRef.current.bottom = isScrollAtBottom;
  return function (deltaY) {
    var smoothOffset = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
    var originScroll = // Pass origin wheel when on the top
    deltaY < 0 && scrollPingRef.current.top || // Pass origin wheel when on the bottom
    deltaY > 0 && scrollPingRef.current.bottom;

    if (smoothOffset && originScroll) {
      // No need lock anymore when it's smooth offset from touchMove interval
      clearTimeout(lockTimeoutRef.current);
      lockRef.current = false;
    } else if (!originScroll || lockRef.current) {
      lockScroll();
    }

    return !lockRef.current && originScroll;
  };
};

exports.default = _default;