import { Observable, ReplaySubject } from 'rxjs';
export declare class KeyboardEventProvider {
    /**
     * HTML canvas element within the HTML5 document to register event listeners to.
     */
    protected _element: HTMLCanvasElement;
    /**
     * Time frame for events to be buffered (windowTime in rxjs per ReplaySubject).
     */
    protected _timeframe: number | undefined;
    protected _keyDownListener: {
        (event: KeyboardEvent): void;
    };
    protected _keyDownSubject: ReplaySubject<KeyboardEvent>;
    protected _keyPressListener: {
        (event: KeyboardEvent): void;
    };
    protected _keyPressSubject: ReplaySubject<KeyboardEvent>;
    protected _keyUpListener: {
        (event: KeyboardEvent): void;
    };
    protected _keyUpSubject: ReplaySubject<KeyboardEvent>;
    /**
     * This mask saves for which types of events, event.preventDefault should be called. This is useful to disallow
     * some kinds of standard events.
     */
    protected _preventDefaultMask: KeyboardEventType;
    constructor(element: HTMLCanvasElement, timeframe?: number);
    /**
     * Checks whether or not to prevent the default handling of the given event. This depends on the internal
     * `preventDefaultMask` which can be modified using `preventDefault` function @see{@link preventDefault}.
     * @param type - Internal event type of the incoming event.
     * @param event - Actual event to prevent default handling on (if masked).
     */
    protected preventDefaultOnEvent(type: KeyboardEventType, event: KeyboardEvent): void;
    /**
     * Prevent default event handling on specific event types (using preventDefault on the event).
     * @param types - Event types to prevent default handling on.
     */
    preventDefault(...types: KeyboardEventType[]): void;
    /**
     * Allow default event handling on specific event types (not calling preventDefault on the event).
     * @param types - Event types to allow default handling on.
     */
    allowDefault(...types: KeyboardEventType[]): void;
    observable(type: KeyboardEventType): Observable<KeyboardEvent> | undefined;
    get keyDown$(): Observable<KeyboardEvent>;
    get keyPress$(): Observable<KeyboardEvent>;
    get keyUp$(): Observable<KeyboardEvent>;
}
export declare enum KeyboardEventType {
    KeyDown = 1,
    KeyPress = 2,
    KeyUp = 4
}