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Viewing file:     focusManager.js (2.24 KB)      -rw-r--r--

import _inheritsLoose from "@babel/runtime/helpers/esm/inheritsLoose";
import { Subscribable } from './subscribable';
import { isServer } from './utils';

var FocusManager = /*#__PURE__*/function (_Subscribable) {
  _inheritsLoose(FocusManager, _Subscribable);

  function FocusManager() {
    return _Subscribable.apply(this, arguments) || this;
  }

  var _proto = FocusManager.prototype;

  _proto.onSubscribe = function onSubscribe() {
    if (!this.removeEventListener) {
      this.setDefaultEventListener();
    }
  };

  _proto.setEventListener = function setEventListener(setup) {
    var _this = this;

    if (this.removeEventListener) {
      this.removeEventListener();
    }

    this.removeEventListener = setup(function (focused) {
      if (typeof focused === 'boolean') {
        _this.setFocused(focused);
      } else {
        _this.onFocus();
      }
    });
  };

  _proto.setFocused = function setFocused(focused) {
    this.focused = focused;

    if (focused) {
      this.onFocus();
    }
  };

  _proto.onFocus = function onFocus() {
    this.listeners.forEach(function (listener) {
      listener();
    });
  };

  _proto.isFocused = function isFocused() {
    if (typeof this.focused === 'boolean') {
      return this.focused;
    } // document global can be unavailable in react native


    if (typeof document === 'undefined') {
      return true;
    }

    return [undefined, 'visible', 'prerender'].includes(document.visibilityState);
  };

  _proto.setDefaultEventListener = function setDefaultEventListener() {
    var _window;

    if (!isServer && ((_window = window) == null ? void 0 : _window.addEventListener)) {
      this.setEventListener(function (onFocus) {
        var listener = function listener() {
          return onFocus();
        }; // Listen to visibillitychange and focus


        window.addEventListener('visibilitychange', listener, false);
        window.addEventListener('focus', listener, false);
        return function () {
          // Be sure to unsubscribe if a new handler is set
          window.removeEventListener('visibilitychange', listener);
          window.removeEventListener('focus', listener);
        };
      });
    }
  };

  return FocusManager;
}(Subscribable);

export var focusManager = new FocusManager();