import { type ICommunicator } from '../Interfaces/ICommunicator';
import { type Desktop } from '../Desktop';
export declare enum UpDown {
    Up = 0,
    Down = 1
}
/**
 * Provides helper functions to handle keyboard
 */
export declare class KeyBoardHelper {
    KeyInputGrab: boolean;
    Comms: ICommunicator;
    parent: Desktop;
    private readonly pressedKeys;
    constructor(parent: Desktop, comms: ICommunicator);
    /**
     * Starts grabbing keyboard events on the document object
     */
    GrabKeyInput(): any;
    /**
     * releases event handlers used for keyboard event handling
     */
    UnGrabKeyInput(): any;
    private handleVisibilityChange;
    private releaseAllKeys;
    private trackAndSend;
    /**
     * halts default keyboard event  handling. Since the sole purpose of this event is to send it to the remote desktop
     * @param e keyboard event
     */
    haltEvent(e: any): boolean;
    handleKeyUp(e: KeyboardEvent): boolean;
    handleKeyDown(e: KeyboardEvent): boolean;
    handleKeyEvent(d: UpDown, ke: KeyboardEvent): boolean;
}