vant/lib/composables/use-visibility-change.js

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);
var stdin_exports = {};
__export(stdin_exports, {
  useVisibilityChange: () => useVisibilityChange
});
module.exports = __toCommonJS(stdin_exports);
var import_utils = require("../utils");
var import_vue = require("vue");
var import_use = require("@vant/use");
function useVisibilityChange(target, onChange) {
  if (!import_utils.inBrowser || !window.IntersectionObserver) {
    return;
  }
  const observer = new IntersectionObserver(
    (entries) => {
      onChange(entries[0].intersectionRatio > 0);
    },
    { root: document.body }
  );
  const observe = () => {
    if (target.value) {
      observer.observe(target.value);
    }
  };
  const unobserve = () => {
    if (target.value) {
      observer.unobserve(target.value);
    }
  };
  (0, import_vue.onDeactivated)(unobserve);
  (0, import_vue.onBeforeUnmount)(unobserve);
  (0, import_use.onMountedOrActivated)(observe);
}