zarm/lib/image/lazy-detector.js

基于 React 的移动端UI库

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

var _typeof = require("@babel/runtime/helpers/typeof");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _slicedToArray2 = _interopRequireDefault(require("@babel/runtime/helpers/slicedToArray"));

var _react = _interopRequireWildcard(require("react"));

var _useInViewport3 = _interopRequireDefault(require("../use-in-viewport"));

function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return null; var r = new WeakMap(), t = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(e) { return e ? t : r; })(e); }

function _interopRequireWildcard(e, r) { if (!r && e && e.__esModule) return e; if (null === e || "object" != _typeof(e) && "function" != typeof e) return { default: e }; var t = _getRequireWildcardCache(r); if (t && t.has(e)) return t.get(e); var n = { __proto__: null }, a = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var u in e) { if ("default" !== u && {}.hasOwnProperty.call(e, u)) { var i = a ? Object.getOwnPropertyDescriptor(e, u) : null; i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u]; } } return n.default = e, t && t.set(e, n), n; }

var LazyDetector = function LazyDetector(props) {
  var ref = (0, _react.useRef)(null);

  var _useInViewport = (0, _useInViewport3.default)(ref),
      _useInViewport2 = (0, _slicedToArray2.default)(_useInViewport, 1),
      inViewport = _useInViewport2[0];

  (0, _react.useEffect)(function () {
    if (inViewport) {
      props.onActive();
    }
  }, [inViewport]);
  return /*#__PURE__*/_react.default.createElement("div", {
    ref: ref
  });
};

var _default = LazyDetector;
exports.default = _default;