@open-condo/miniapp-utils/dist/hooks/useIntersectionObserver.js

A set of helper functions / components / hooks used to build new condo apps fast

"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/hooks/useIntersectionObserver.ts
var useIntersectionObserver_exports = {};
__export(useIntersectionObserver_exports, {
  useIntersectionObserver: () => useIntersectionObserver
});
module.exports = __toCommonJS(useIntersectionObserver_exports);
var import_react = require("react");
function useIntersectionObserver({
  threshold = 0,
  root = null,
  rootMargin = "0%",
  onChange
} = {}) {
  const [ref, setRef] = (0, import_react.useState)(null);
  const [state, setState] = (0, import_react.useState)(() => ({
    isIntersecting: false,
    entry: void 0
  }));
  const callbackRef = (0, import_react.useRef)();
  callbackRef.current = onChange;
  (0, import_react.useEffect)(() => {
    if (!ref) return;
    if (!("IntersectionObserver" in window)) return;
    const observer = new IntersectionObserver((entries) => {
      const thresholds = observer.thresholds;
      entries.forEach((entry) => {
        const isIntersecting = entry.isIntersecting && thresholds.some((threshold2) => entry.intersectionRatio >= threshold2);
        setState({ isIntersecting, entry });
        if (callbackRef.current) {
          callbackRef.current(isIntersecting, entry);
        }
      });
    }, { threshold, root, rootMargin });
    observer.observe(ref);
    return () => {
      observer.disconnect();
    };
  }, [ref, root, rootMargin, threshold]);
  const prevRef = (0, import_react.useRef)(null);
  (0, import_react.useEffect)(() => {
    var _a;
    if (!ref && ((_a = state.entry) == null ? void 0 : _a.target) && prevRef.current !== state.entry.target) {
      prevRef.current = state.entry.target;
      setState({ isIntersecting: false, entry: void 0 });
    }
  }, [ref, state.entry]);
  return {
    entry: state.entry,
    ref: setRef,
    isIntersecting: state.isIntersecting
  };
}
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  useIntersectionObserver
});
//# sourceMappingURL=useIntersectionObserver.js.map