@josmangarsal/pragmatic-scheduler/dist/hooks/useVisibilityObserver.js

React resource scheduler

"use strict";
var __read = (this && this.__read) || function (o, n) {
    var m = typeof Symbol === "function" && o[Symbol.iterator];
    if (!m) return o;
    var i = m.call(o), r, ar = [], e;
    try {
        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
    }
    catch (error) { e = { error: error }; }
    finally {
        try {
            if (r && !r.done && (m = i["return"])) m.call(i);
        }
        finally { if (e) throw e.error; }
    }
    return ar;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.useVisibilityObserver = void 0;
var react_1 = require("react");
function useVisibilityObserver(_a) {
    var root = _a.root, targetRef = _a.targetRef, _b = _a.threshold, threshold = _b === void 0 ? 1.0 : _b;
    var _c = __read((0, react_1.useState)(false), 2), isVisible = _c[0], setIsVisible = _c[1];
    (0, react_1.useEffect)(function () {
        var target = targetRef.current;
        if (!target || !root)
            return;
        var observer = new IntersectionObserver(function (_a) {
            var _b = __read(_a, 1), entry = _b[0];
            setIsVisible(entry.intersectionRatio >= threshold);
        }, {
            root: root,
            threshold: threshold,
        });
        observer.observe(target);
        return function () {
            observer.disconnect();
        };
    }, [root, targetRef, threshold]);
    return { isVisible: isVisible };
}
exports.useVisibilityObserver = useVisibilityObserver;