@sullivan/react-virtualizer/lib/Reveal.js

Simple pseudo virtualization and reveal components to hide off-window components

"use strict";
var __assign = (this && this.__assign) || function () {
    __assign = Object.assign || function(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
                t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};
var __rest = (this && this.__rest) || function (s, e) {
    var t = {};
    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
        t[p] = s[p];
    if (s != null && typeof Object.getOwnPropertySymbols === "function")
        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
                t[p[i]] = s[p[i]];
        }
    return t;
};
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
    result["default"] = mod;
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
var react_1 = __importStar(require("react"));
require("./VirtualTypes");
var Reveal = function (_a) {
    var children = _a.children, _b = _a.tag, tag = _b === void 0 ? 'div' : _b, props = __rest(_a, ["children", "tag"]);
    var _c = react_1.useState(false), vis = _c[0], setVis = _c[1];
    var ref = react_1.useRef();
    react_1.useEffect(function () {
        var obs = new IntersectionObserver(function (entries) {
            if (entries[0].isIntersecting) {
                setVis(true);
                // @ts-ignore
                obs.unobserve(ref.current);
            }
        }, {
            root: null,
            rootMargin: '0px',
            threshold: [0],
        });
        // @ts-ignore
        obs.observe(ref.current);
        return function () { return obs.disconnect(); };
    }, []);
    return react_1.default.createElement(tag, __assign({}, props, { ref: ref }), vis ? children : []);
};
exports.default = Reveal;