InternshipProject/node_modules/rc-virtual-list/es/hooks/useMobileTouchMove.js

import * as React from 'react';
import { useRef } from 'react';
var SMOOTH_PTG = 14 / 15;
export default function useMobileTouchMove(inVirtual, listRef, callback) {
  var touchedRef = useRef(false);
  var touchYRef = useRef(0);
  var elementRef = useRef(null); // Smooth scroll

  var intervalRef = useRef(null);
  /* eslint-disable prefer-const */

  var cleanUpEvents;

  var onTouchMove = function onTouchMove(e) {
    if (touchedRef.current) {
      var currentY = Math.ceil(e.touches[0].pageY);
      var offsetY = touchYRef.current - currentY;
      touchYRef.current = currentY;

      if (callback(offsetY)) {
        e.preventDefault();
      } // Smooth interval


      clearInterval(intervalRef.current);
      intervalRef.current = setInterval(function () {
        offsetY *= SMOOTH_PTG;

        if (!callback(offsetY, true) || Math.abs(offsetY) <= 0.1) {
          clearInterval(intervalRef.current);
        }
      }, 16);
    }
  };

  var onTouchEnd = function onTouchEnd() {
    touchedRef.current = false;
    cleanUpEvents();
  };

  var onTouchStart = function onTouchStart(e) {
    cleanUpEvents();

    if (e.touches.length === 1 && !touchedRef.current) {
      touchedRef.current = true;
      touchYRef.current = Math.ceil(e.touches[0].pageY);
      elementRef.current = e.target;
      elementRef.current.addEventListener('touchmove', onTouchMove);
      elementRef.current.addEventListener('touchend', onTouchEnd);
    }
  };

  cleanUpEvents = function cleanUpEvents() {
    if (elementRef.current) {
      elementRef.current.removeEventListener('touchmove', onTouchMove);
      elementRef.current.removeEventListener('touchend', onTouchEnd);
    }
  };

  React.useLayoutEffect(function () {
    if (inVirtual) {
      listRef.current.addEventListener('touchstart', onTouchStart);
    }

    return function () {
      listRef.current.removeEventListener('touchstart', onTouchStart);
      cleanUpEvents();
      clearInterval(intervalRef.current);
    };
  }, [inVirtual]);
}