@atlaskit/renderer
Version:
Renderer component
49 lines (48 loc) • 2.85 kB
JavaScript
;
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.useInViewport = void 0;
var _slicedToArray2 = _interopRequireDefault(require("@babel/runtime/helpers/slicedToArray"));
var _react = require("react");
function _createForOfIteratorHelper(r, e) { var t = "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (!t) { if (Array.isArray(r) || (t = _unsupportedIterableToArray(r)) || e && r && "number" == typeof r.length) { t && (r = t); var _n = 0, F = function F() {}; return { s: F, n: function n() { return _n >= r.length ? { done: !0 } : { done: !1, value: r[_n++] }; }, e: function e(r) { throw r; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var o, a = !0, u = !1; return { s: function s() { t = t.call(r); }, n: function n() { var r = t.next(); return a = r.done, r; }, e: function e(r) { u = !0, o = r; }, f: function f() { try { a || null == t.return || t.return(); } finally { if (u) throw o; } } }; }
function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } }
function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; }
var useInViewport = exports.useInViewport = function useInViewport() {
var trackingRef = (0, _react.useRef)(null);
var _useState = (0, _react.useState)(false),
_useState2 = (0, _slicedToArray2.default)(_useState, 2),
isInViewport = _useState2[0],
setIsInViewport = _useState2[1];
(0, _react.useEffect)(function () {
if (!trackingRef || !(trackingRef !== null && trackingRef !== void 0 && trackingRef.current)) {
return;
}
var target = trackingRef.current;
var observer = new IntersectionObserver(function (entries) {
var _iterator = _createForOfIteratorHelper(entries),
_step;
try {
for (_iterator.s(); !(_step = _iterator.n()).done;) {
var entry = _step.value;
if (entry.isIntersecting) {
setIsInViewport(true);
}
}
} catch (err) {
_iterator.e(err);
} finally {
_iterator.f();
}
});
observer.observe(target);
return function () {
return observer.disconnect();
};
}, [trackingRef]);
return {
isInViewport: isInViewport,
trackingRef: trackingRef
};
};