@n0n3br/react-use-scroll-direction/dist/index.cjs

A robust React hook to detect vertical scroll direction ('up', 'down', 'static') for any DOM element or the window.

"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/index.ts
var src_exports = {};
__export(src_exports, {
  useScrollDirection: () => useScrollDirection
});
module.exports = __toCommonJS(src_exports);
var import_react = require("react");
function useScrollDirection(ref, options) {
  const { threshold = 0, throttleDelay = 100 } = options || {};
  const [scrollDirection, setScrollDirection] = (0, import_react.useState)("static");
  const lastScrollPosition = (0, import_react.useRef)(0);
  const throttleTimeoutId = (0, import_react.useRef)(null);
  const getScrollY = (0, import_react.useCallback)(() => {
    if (ref && ref.current) {
      return ref.current.scrollTop;
    }
    return window.scrollY;
  }, [ref]);
  (0, import_react.useEffect)(() => {
    const targetElement = ref && ref.current ? ref.current : window;
    if (!targetElement)
      return;
    lastScrollPosition.current = getScrollY();
    const handleScroll = () => {
      const currentScrollPosition = getScrollY();
      const scrollDifference = currentScrollPosition - lastScrollPosition.current;
      if (Math.abs(scrollDifference) <= threshold) {
        return;
      }
      if (scrollDifference > 0) {
        setScrollDirection("down");
      } else {
        setScrollDirection("up");
      }
      lastScrollPosition.current = currentScrollPosition;
    };
    const throttledHandleScroll = () => {
      if (throttleTimeoutId.current === null) {
        throttleTimeoutId.current = window.requestAnimationFrame(() => {
          handleScroll();
          throttleTimeoutId.current = null;
        });
      }
    };
    const throttledHandleScrollWithDelay = () => {
      if (throttleTimeoutId.current === null) {
        throttleTimeoutId.current = window.setTimeout(() => {
          handleScroll();
          throttleTimeoutId.current = null;
        }, throttleDelay);
      }
    };
    const effectiveThrottledScrollHandler = throttleDelay > 0 && throttleDelay !== 100 ? throttledHandleScrollWithDelay : throttledHandleScroll;
    targetElement.addEventListener("scroll", effectiveThrottledScrollHandler, {
      passive: true
    });
    return () => {
      targetElement.removeEventListener(
        "scroll",
        effectiveThrottledScrollHandler
      );
      if (throttleTimeoutId.current !== null) {
        if (throttleDelay > 0 && throttleDelay !== 100) {
          clearTimeout(throttleTimeoutId.current);
        } else {
          cancelAnimationFrame(throttleTimeoutId.current);
        }
        throttleTimeoutId.current = null;
      }
    };
  }, [ref, threshold, throttleDelay, getScrollY]);
  return scrollDirection;
}
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  useScrollDirection
});