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

"use strict";

function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

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

var React = _interopRequireWildcard(require("react"));

function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }

function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }

var SMOOTH_PTG = 14 / 15;

function useMobileTouchMove(inVirtual, listRef, callback) {
  var touchedRef = (0, React.useRef)(false);
  var touchYRef = (0, React.useRef)(0);
  var elementRef = (0, React.useRef)(null); // Smooth scroll

  var intervalRef = (0, React.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]);
}