import ScreenObserver from '../screenviewing/observer/ScreenObserver';
export default interface ScreenShareViewFacade {
    /**
     * Opens the connections, must be called after the ScreenShareViewFacade is constructed
     */
    open(): Promise<void>;
    /**
     * Closes screen viewing connection
     */
    close(): Promise<void>;
    /**
     * Starts viewing the screen share within an HTML element. Note that an
     * HTMLCanvas will be placed inside of this element.
     */
    start(element: HTMLDivElement): Promise<void>;
    /**
     * Stops viewing the screen share.
     */
    stop(): Promise<void>;
    /**
     * Changes the presentation policy to scale-to-fit
     */
    presentScaleToFit(): void;
    /**
     * Changes the presentation policy to allow dragging and zooming
     */
    presentDragAndZoom(): void;
    /**
     * Zooms in
     */
    zoomIn(relativeZoomFactor?: number): void;
    /**
     * Zooms out
     */
    zoomOut(relativeZoomFactor?: number): void;
    /**
     * Zooms
     */
    zoom(absoluteZoomFactor: number): void;
    /**
     * Resets zoom
     */
    zoomReset(): void;
    /**
     * Registers an observer
     */
    registerObserver(observer: ScreenObserver): void;
    /**
     * Unregisters an observer
     */
    unregisterObserver(observer: ScreenObserver): void;
}