import { MatDialog } from '@angular/material';
import { Presentation, PresentationEvent } from './presentation';
import { Observable, Subject } from 'rxjs';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/mergeMap';
export declare class PresentationsService {
    private dialog;
    private _activePresentation;
    activePresentationChange: Subject<Presentation>;
    constructor(dialog: MatDialog);
    private setActivePresentation(pres);
    private clearActivePresentation();
    private viewSlide(slides, index);
    present(presentation: Presentation, fromSlide?: number): Observable<PresentationEvent>;
    readonly presenting: boolean;
}