import { ModalInstance } from './modal-instance';
import { NgxSmartModalComponent } from '../components/ngx-smart-modal.component';
import * as i0 from "@angular/core";
export declare class NgxSmartModalStackService {
    private _modalStack;
    constructor();
    /**
     * Add a new modal instance. This step is essential and allows to retrieve any modal at any time.
     * It stores an object that contains the given modal identifier and the modal itself directly in the `modalStack`.
     *
     * @param modalInstance The object that contains the given modal identifier and the modal itself.
     * @param force Optional parameter that forces the overriding of modal instance if it already exists.
     * @returns nothing special.
     */
    addModal(modalInstance: ModalInstance, force?: boolean): void;
    /**
     * Retrieve a modal instance by its identifier.
     *
     * @param id The modal identifier used at creation time.
     */
    getModal(id: string): NgxSmartModalComponent;
    /**
     * Retrieve all the created modals.
     *
     * @returns an array that contains all modal instances.
     */
    getModalStack(): ModalInstance[];
    /**
     * Retrieve all the opened modals. It looks for all modal instances with their `visible` property set to `true`.
     *
     * @returns an array that contains all the opened modals.
     */
    getOpenedModals(): ModalInstance[];
    /**
     * Retrieve the opened modal with highest z-index.
     *
     * @returns the opened modal with highest z-index.
     */
    getTopOpenedModal(): NgxSmartModalComponent;
    /**
     * Get the higher `z-index` value between all the modal instances. It iterates over the `ModalStack` array and
     * calculates a higher value (it takes the highest index value between all the modal instances and adds 1).
     * Use it to make a modal appear foreground.
     *
     * @returns a higher index from all the existing modal instances.
     */
    getHigherIndex(): number;
    /**
     * It gives the number of modal instances. It's helpful to know if the modal stack is empty or not.
     *
     * @returns the number of modal instances.
     */
    getModalStackCount(): number;
    /**
     * Remove a modal instance from the modal stack.
     * Returns the removed modal instance or undefined if no modal was found
     *
     * @param id The modal identifier.
     * @returns the removed modal instance.
     */
    removeModal(id: string): undefined | ModalInstance;
    static ɵfac: i0.ɵɵFactoryDeclaration<NgxSmartModalStackService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<NgxSmartModalStackService>;
}