use-scroll-position
Version:
https://bmgaynor.gitlab.io/use-scroll-position/#/
74 lines (61 loc) • 1.73 kB
JavaScript
import { useEffect, useState } from 'react';
var slicedToArray = function () {
function sliceIterator(arr, i) {
var _arr = [];
var _n = true;
var _d = false;
var _e = undefined;
try {
for (var _i = arr[Symbol.iterator](), _s; !(_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"]) _i["return"]();
} finally {
if (_d) throw _e;
}
}
return _arr;
}
return function (arr, i) {
if (Array.isArray(arr)) {
return arr;
} else if (Symbol.iterator in Object(arr)) {
return sliceIterator(arr, i);
} else {
throw new TypeError("Invalid attempt to destructure non-iterable instance");
}
};
}();
var useScrollPosition = function useScrollPosition() {
var _useState = useState(0),
_useState2 = slicedToArray(_useState, 2),
scrollPosition = _useState2[0],
setScrollPosition = _useState2[1];
useEffect(function () {
var last_known_scroll_position = 0;
var ticking = false;
var handleScroll = function handleScroll(e) {
last_known_scroll_position = window.scrollY;
if (!ticking) {
window.requestAnimationFrame(function () {
setScrollPosition(last_known_scroll_position);
ticking = false;
});
ticking = true;
}
};
window.addEventListener('scroll', handleScroll);
return function () {
window.removeEventListener('scroll', handleScroll);
};
});
return scrollPosition;
};
export default useScrollPosition;
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