@netdata/netdata-ui/dist/es6/components/intersection/index.js

netdata UI kit

var _excluded = ["height", "width", "fallback", "root", "rootMargin", "threshold", "onVisibility", "children", "ref"];
function _extends() { return _extends = Object.assign ? Object.assign.bind() : function (n) { for (var e = 1; e < arguments.length; e++) { var t = arguments[e]; for (var r in t) ({}).hasOwnProperty.call(t, r) && (n[r] = t[r]); } return n; }, _extends.apply(null, arguments); }
function _objectWithoutPropertiesLoose(r, e) { if (null == r) return {}; var t = {}; for (var n in r) if ({}.hasOwnProperty.call(r, n)) { if (-1 !== e.indexOf(n)) continue; t[n] = r[n]; } return t; }
import React, { useRef } from "react";
import usePrevious from "../../hooks/usePrevious";
import Flex from "../templates/flex";
import useIntersection from "../../hooks/useIntersection";
import setParentRef from "../../mixins/set-ref";
var getContent = function getContent(value) {
  return typeof value === "function" ? value() : value;
};
var Intersection = function Intersection(_ref) {
  var _ref$height = _ref.height,
    height = _ref$height === void 0 ? "100%" : _ref$height,
    _ref$width = _ref.width,
    width = _ref$width === void 0 ? "100%" : _ref$width,
    _ref$fallback = _ref.fallback,
    fallback = _ref$fallback === void 0 ? null : _ref$fallback,
    root = _ref.root,
    _ref$rootMargin = _ref.rootMargin,
    rootMargin = _ref$rootMargin === void 0 ? "0px" : _ref$rootMargin,
    _ref$threshold = _ref.threshold,
    threshold = _ref$threshold === void 0 ? 0 : _ref$threshold,
    onVisibility = _ref.onVisibility,
    children = _ref.children,
    parentRef = _ref.ref,
    rest = _objectWithoutPropertiesLoose(_ref, _excluded);
  var _useIntersection = useIntersection({
      root: root,
      rootMargin: rootMargin,
      threshold: threshold,
      onVisibility: onVisibility
    }),
    setRef = _useIntersection[0],
    ref = _useIntersection[1],
    visible = _useIntersection[2];
  var prevVisible = usePrevious(visible);
  var lastHeightRef = useRef(height);
  if (visible !== prevVisible && !visible && ref.current) {
    lastHeightRef.current = ref.current.clientHeight + "px";
  }
  return /*#__PURE__*/React.createElement(Flex, _extends({
    ref: function ref(element) {
      setRef(element);
      setParentRef(parentRef, element);
    },
    width: width,
    height: visible ? height : {
      min: lastHeightRef.current
    }
  }, rest), getContent(visible ? children : fallback));
};
export default Intersection;