"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/focusManager.ts
var focusManager_exports = {};
__export(focusManager_exports, {
  FocusManager: () => FocusManager,
  focusManager: () => focusManager
});
module.exports = __toCommonJS(focusManager_exports);
var import_subscribable = require("./subscribable.cjs");
var FocusManager = class extends import_subscribable.Subscribable {
  #focused;
  #cleanup;
  #setup;
  constructor() {
    super();
    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 (!this.#cleanup) {
      this.setEventListener(this.#setup);
    }
  }
  onUnsubscribe() {
    if (!this.hasListeners()) {
      this.#cleanup?.();
      this.#cleanup = void 0;
    }
  }
  setEventListener(setup) {
    this.#setup = setup;
    this.#cleanup?.();
    this.#cleanup = setup((focused) => {
      if (typeof focused === "boolean") {
        this.setFocused(focused);
      } else {
        this.onFocus();
      }
    });
  }
  setFocused(focused) {
    const changed = this.#focused !== focused;
    if (changed) {
      this.#focused = focused;
      this.onFocus();
    }
  }
  onFocus() {
    const isFocused = this.isFocused();
    this.listeners.forEach((listener) => {
      listener(isFocused);
    });
  }
  isFocused() {
    if (typeof this.#focused === "boolean") {
      return this.#focused;
    }
    return globalThis.document?.visibilityState !== "hidden";
  }
};
var focusManager = new FocusManager();
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  FocusManager,
  focusManager
});
//# sourceMappingURL=focusManager.cjs.map