pay-sdk-react/dist/es/hooks/use-lock-scroll.js

A cross-platform payment SDK for React, supporting Alipay, WeChat Pay, PayPal, Stripe, Payssion, and Airwallex, compatible with H5, PC, and App environments.

import { useEffect } from "react";
import { getScrollParent } from "../utils/get-scroll-parent";
import { supportsPassive } from "../utils/supports-passive";
import { useTouch } from "./use-touch";
let totalLockCount = 0;
const BODY_LOCK_CLASS = "yfm-overflow-hidden";
function getScrollableElement(el) {
  let current = el === null || el === void 0 ? void 0 : el.parentElement;
  while (current) {
    if (current.clientHeight < current.scrollHeight) {
      return current;
    }
    current = current.parentElement;
  }
  return null;
}
export function useLockScroll(rootRef, shouldLock) {
  const touch = useTouch();
  const onTouchMove = event => {
    touch.move(event);
    const direction = touch.deltaY.current > 0 ? "10" : "01";
    const el = getScrollParent(event.target, rootRef.current);
    if (!el) return;

    // This has perf cost but we have to compatible with iOS 12
    if (shouldLock === "strict") {
      const scrollableParent = getScrollableElement(event.target);
      if (scrollableParent === document.body || scrollableParent === document.documentElement) {
        event.preventDefault();
        return;
      }
    }
    const {
      scrollHeight,
      offsetHeight,
      scrollTop
    } = el;
    const {
      height
    } = el.getBoundingClientRect();
    let status = "11";
    if (scrollTop === 0) {
      status = offsetHeight >= scrollHeight ? "00" : "01";
    } else if (scrollHeight <= Math.round(height + scrollTop)) {
      status = "10";
    }
    if (status !== "11" && touch.isVertical() && !(parseInt(status, 2) & parseInt(direction, 2))) {
      if (event.cancelable && supportsPassive) {
        event.preventDefault();
      }
    }
  };
  const lock = () => {
    document.addEventListener("touchstart", touch.start);
    document.addEventListener("touchmove", onTouchMove, supportsPassive ? {
      passive: false
    } : false);
    if (!totalLockCount) {
      document.body.classList.add(BODY_LOCK_CLASS);
    }
    totalLockCount++;
  };
  const unlock = () => {
    if (totalLockCount) {
      document.removeEventListener("touchstart", touch.start);
      document.removeEventListener("touchmove", onTouchMove);
      totalLockCount--;
      if (!totalLockCount) {
        document.body.classList.remove(BODY_LOCK_CLASS);
      }
    }
  };
  useEffect(() => {
    if (shouldLock) {
      lock();
      return () => {
        unlock();
      };
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [shouldLock]);
}