@ccs-design/rc-pro/es/useTouchMove.js

ccs design basic react component

function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

function _iterableToArrayLimit(arr, i) { var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"]; if (_i == null) return; var _arr = []; var _n = true; var _d = false; var _s, _e; try { for (_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }

function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }

import * as React from 'react';
import { useState, useRef } from 'react';
var MIN_SWIPE_DISTANCE = 0.1;
var STOP_SWIPE_DISTANCE = 0.01;
var REFRESH_INTERVAL = 20;
var SPEED_OFF_MULTIPLE = Math.pow(0.995, REFRESH_INTERVAL); // ================================= Hook =================================

export default function useTouchMove(ref, onOffset) {
  var _useState = useState(),
      _useState2 = _slicedToArray(_useState, 2),
      touchPosition = _useState2[0],
      setTouchPosition = _useState2[1];

  var _useState3 = useState(0),
      _useState4 = _slicedToArray(_useState3, 2),
      lastTimestamp = _useState4[0],
      setLastTimestamp = _useState4[1];

  var _useState5 = useState(0),
      _useState6 = _slicedToArray(_useState5, 2),
      lastTimeDiff = _useState6[0],
      setLastTimeDiff = _useState6[1];

  var _useState7 = useState(),
      _useState8 = _slicedToArray(_useState7, 2),
      lastOffset = _useState8[0],
      setLastOffset = _useState8[1];

  var motionRef = useRef(); // ========================= Events =========================
  // >>> Touch events

  function onTouchStart(e) {
    var _e$touches$ = e.touches[0],
        screenX = _e$touches$.screenX,
        screenY = _e$touches$.screenY;
    setTouchPosition({
      x: screenX,
      y: screenY
    });
    window.clearInterval(motionRef.current);
  }

  function onTouchMove(e) {
    if (!touchPosition) return;
    e.preventDefault();
    var _e$touches$2 = e.touches[0],
        screenX = _e$touches$2.screenX,
        screenY = _e$touches$2.screenY;
    setTouchPosition({
      x: screenX,
      y: screenY
    });
    var offsetX = screenX - touchPosition.x;
    var offsetY = screenY - touchPosition.y;
    onOffset(offsetX, offsetY);
    var now = Date.now();
    setLastTimestamp(now);
    setLastTimeDiff(now - lastTimestamp);
    setLastOffset({
      x: offsetX,
      y: offsetY
    });
  }

  function onTouchEnd() {
    if (!touchPosition) return;
    setTouchPosition(null);
    setLastOffset(null); // Swipe if needed

    if (lastOffset) {
      var distanceX = lastOffset.x / lastTimeDiff;
      var distanceY = lastOffset.y / lastTimeDiff;
      var absX = Math.abs(distanceX);
      var absY = Math.abs(distanceY); // Skip swipe if low distance

      if (Math.max(absX, absY) < MIN_SWIPE_DISTANCE) return;
      var currentX = distanceX;
      var currentY = distanceY;
      motionRef.current = window.setInterval(function () {
        if (Math.abs(currentX) < STOP_SWIPE_DISTANCE && Math.abs(currentY) < STOP_SWIPE_DISTANCE) {
          window.clearInterval(motionRef.current);
          return;
        }

        currentX *= SPEED_OFF_MULTIPLE;
        currentY *= SPEED_OFF_MULTIPLE;
        onOffset(currentX * REFRESH_INTERVAL, currentY * REFRESH_INTERVAL);
      }, REFRESH_INTERVAL);
    }
  } // >>> Wheel event


  var lastWheelDirectionRef = useRef();

  function onWheel(e) {
    var deltaX = e.deltaX,
        deltaY = e.deltaY; // Convert both to x & y since wheel only happened on PC

    var mixed = 0;
    var absX = Math.abs(deltaX);
    var absY = Math.abs(deltaY);

    if (absX === absY) {
      mixed = lastWheelDirectionRef.current === 'x' ? deltaX : deltaY;
    } else if (absX > absY) {
      mixed = deltaX;
      lastWheelDirectionRef.current = 'x';
    } else {
      mixed = deltaY;
      lastWheelDirectionRef.current = 'y';
    }

    if (onOffset(-mixed, -mixed)) {
      e.preventDefault();
    }
  } // ========================= Effect =========================


  var touchEventsRef = useRef(null);
  touchEventsRef.current = {
    onTouchStart: onTouchStart,
    onTouchMove: onTouchMove,
    onTouchEnd: onTouchEnd,
    onWheel: onWheel
  };
  React.useEffect(function () {
    var _ref$current, _ref$current2;

    function onProxyTouchStart(e) {
      var _touchEventsRef$curre;

      (_touchEventsRef$curre = touchEventsRef.current) === null || _touchEventsRef$curre === void 0 ? void 0 : _touchEventsRef$curre.onTouchStart(e);
    }

    function onProxyTouchMove(e) {
      var _touchEventsRef$curre2;

      (_touchEventsRef$curre2 = touchEventsRef.current) === null || _touchEventsRef$curre2 === void 0 ? void 0 : _touchEventsRef$curre2.onTouchMove(e);
    }

    function onProxyTouchEnd(e) {
      var _touchEventsRef$curre3;

      (_touchEventsRef$curre3 = touchEventsRef.current) === null || _touchEventsRef$curre3 === void 0 ? void 0 : _touchEventsRef$curre3.onTouchEnd(e);
    }

    function onProxyWheel(e) {
      var _touchEventsRef$curre4;

      (_touchEventsRef$curre4 = touchEventsRef.current) === null || _touchEventsRef$curre4 === void 0 ? void 0 : _touchEventsRef$curre4.onWheel(e);
    }

    document.addEventListener('touchmove', onProxyTouchMove, {
      passive: false
    });
    document.addEventListener('touchend', onProxyTouchEnd, {
      passive: false
    }); // No need to clean up since element removed

    (_ref$current = ref.current) === null || _ref$current === void 0 ? void 0 : _ref$current.addEventListener('touchstart', onProxyTouchStart, {
      passive: false
    });
    (_ref$current2 = ref.current) === null || _ref$current2 === void 0 ? void 0 : _ref$current2.addEventListener('wheel', onProxyWheel);
    return function () {
      document.removeEventListener('touchmove', onProxyTouchMove);
      document.removeEventListener('touchend', onProxyTouchEnd);
    };
  }, []);
}