import { EventEmitter, Injector } from '@angular/core';
import { HubPortalOptions } from './portal-config';
import { HubPortalRef } from './portal-ref';
import * as i0 from "@angular/core";
export declare class HubPortalStack {
    private _applicationRef;
    private _injector;
    private _environmentInjector;
    private _document;
    private _scrollBar;
    private _activeWindowCmptHasChanged;
    private _ariaHiddenValues;
    private _scrollBarRestoreFn;
    private _portalRefs;
    private _windowCmpts;
    private _activeInstances;
    constructor();
    private _restoreScrollBar;
    private _hideScrollBar;
    open(contentInjector: Injector, content: any, options: HubPortalOptions): HubPortalRef;
    /**
     * Toggles a portal by dismissing all existing portals and waiting for them to be hidden
     * before showing the new one.
     *
     * @param contentInjector - The injector to use for dependency injection
     * @param content - The content to display (component, template, or string)
     * @param options - Portal configuration options
     * @returns A reference to the newly created portal
     */
    toggle(contentInjector: Injector, content: any, options: HubPortalOptions): HubPortalRef;
    get activeInstances(): EventEmitter<HubPortalRef[]>;
    dismissAll(reason?: any): void;
    hasOpenPortals(): boolean;
    private _createWindowComponent;
    private _attachWindowComponent;
    private _getContentRef;
    private _createFromTemplateRef;
    private _createFromString;
    private _createFromComponent;
    private _setAriaHidden;
    private _revertAriaHidden;
    private _registerPortalRef;
    private _registerWindowCmpt;
    /**
     * Attaches click event listeners to elements within a container based on a specified dismiss selector to dismiss a portal.
     *
     * @param {HTMLElement} container - The `container` parameter is an HTMLElement that represents the DOM element which contains the
     * portal content.
     * @param {HubActivePortal} context - The `context` parameter in the `_addDismissEventListener` function refers to the active portal
     * instance that is being displayed. It is used to call the `dismiss` method on the portal instance when a dismissible element is
     * clicked.
     * @param {HubPortalOptions} options - The `options` parameter is an object that contains configuration options for the portal. It
     * may include properties such as `dismissSelector`, which is used to specify a CSS selector for elements that, when clicked, will
     * dismiss the portal by calling the `dismiss` method on the `context` object.
     */
    private _addDismissEventListener;
    /**
     * Attaches click event listeners to elements matching a specified selector to close a portal window.
     *
     * @param {HTMLElement} container - The `container` parameter is an HTMLElement that represents the DOM element which contains the
     * portal content.
     * @param {HubActivePortal} context - The `context` parameter in the `_addCloseEventListener` function is of type `HubActivePortal`.
     * It is used to reference the active portal instance within the function and call the `close()` method on it when a close event is
     * triggered.
     * @param {HubPortalOptions} options - The `options` parameter is an object that contains configuration options for the portal. It
     * may include properties such as `closeSelector`, which is used to specify the selector for elements that can trigger the portal
     * to close when clicked.
     */
    private _addCloseEventListener;
    static ɵfac: i0.ɵɵFactoryDeclaration<HubPortalStack, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<HubPortalStack>;
}