"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __typeError = (msg) => {
  throw TypeError(msg);
};
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 __accessCheck = (obj, member, msg) => member.has(obj) || __typeError("Cannot " + msg);
var __privateGet = (obj, member, getter) => (__accessCheck(obj, member, "read from private field"), getter ? getter.call(obj) : member.get(obj));
var __privateAdd = (obj, member, value) => member.has(obj) ? __typeError("Cannot add the same private member more than once") : member instanceof WeakSet ? member.add(obj) : member.set(obj, value);
var __privateSet = (obj, member, value, setter) => (__accessCheck(obj, member, "write to private field"), setter ? setter.call(obj, value) : member.set(obj, value), value);

// src/focusManager.ts
var focusManager_exports = {};
__export(focusManager_exports, {
  FocusManager: () => FocusManager,
  focusManager: () => focusManager
});
module.exports = __toCommonJS(focusManager_exports);
var import_subscribable = require("./subscribable.cjs");
var _focused, _cleanup, _setup;
var FocusManager = class extends import_subscribable.Subscribable {
  constructor() {
    super();
    __privateAdd(this, _focused);
    __privateAdd(this, _cleanup);
    __privateAdd(this, _setup);
    __privateSet(this, _setup, (onFocus) => {
      if (typeof window !== "undefined" && window.addEventListener) {
        const listener = () => onFocus();
        window.addEventListener("visibilitychange", listener, false);
        return () => {
          window.removeEventListener("visibilitychange", listener);
        };
      }
      return;
    });
  }
  onSubscribe() {
    if (!__privateGet(this, _cleanup)) {
      this.setEventListener(__privateGet(this, _setup));
    }
  }
  onUnsubscribe() {
    var _a;
    if (!this.hasListeners()) {
      (_a = __privateGet(this, _cleanup)) == null ? void 0 : _a.call(this);
      __privateSet(this, _cleanup, void 0);
    }
  }
  setEventListener(setup) {
    var _a;
    __privateSet(this, _setup, setup);
    (_a = __privateGet(this, _cleanup)) == null ? void 0 : _a.call(this);
    __privateSet(this, _cleanup, setup((focused) => {
      if (typeof focused === "boolean") {
        this.setFocused(focused);
      } else {
        this.onFocus();
      }
    }));
  }
  setFocused(focused) {
    const changed = __privateGet(this, _focused) !== focused;
    if (changed) {
      __privateSet(this, _focused, focused);
      this.onFocus();
    }
  }
  onFocus() {
    const isFocused = this.isFocused();
    this.listeners.forEach((listener) => {
      listener(isFocused);
    });
  }
  isFocused() {
    var _a;
    if (typeof __privateGet(this, _focused) === "boolean") {
      return __privateGet(this, _focused);
    }
    return ((_a = globalThis.document) == null ? void 0 : _a.visibilityState) !== "hidden";
  }
};
_focused = new WeakMap();
_cleanup = new WeakMap();
_setup = new WeakMap();
var focusManager = new FocusManager();
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  FocusManager,
  focusManager
});
//# sourceMappingURL=focusManager.cjs.map