import { InputDevice, InputState } from "../input-device";
/**
 * See key mappings in http://gcctech.org/csc/javascript/javascript_keycodes.htm
 */
export declare enum Key {
    ARROW_LEFT = 37,
    ARROW_UP = 38,
    ARROW_RIGHT = 39,
    ARROW_DOWN = 40,
    N0 = 48,
    N1 = 49,
    N2 = 50,
    N3 = 51,
    N4 = 52,
    N5 = 53,
    N6 = 54,
    N7 = 55,
    N8 = 56,
    N9 = 57,
    A = 65,
    B = 66,
    C = 67,
    D = 68,
    E = 69,
    F = 70,
    G = 71,
    H = 72,
    I = 73,
    J = 74,
    K = 75,
    L = 76,
    M = 77,
    N = 78,
    O = 79,
    P = 80,
    Q = 81,
    R = 82,
    S = 83,
    T = 84,
    U = 85,
    V = 86,
    W = 87,
    X = 88,
    Y = 89,
    Z = 90
}
export declare class KeyState extends InputState {
    constructor();
}
export declare class Keyboard extends InputDevice {
    private static readonly DEFAULT_KEY;
    private _isPaused;
    private readonly _keys;
    private readonly _states;
    private _holdFrameDelay;
    private _element;
    constructor();
    /**
     * Get or Set the frame-delay of when the PRESSED event is changed into the HELD event.
     * Default is 5 frame delay
     */
    get holdFrameDelay(): number;
    set holdFrameDelay(delay: number);
    /**
     * Checks if the provided keyboard key has been pressed/clicked
     *
     * @param key - the keyboard key to check
     */
    isPressed(key: Key, firstOnly?: boolean): boolean;
    /**
     * Checks if the provided keyboard key has been released. This normally follows
     * a pressed event.
     *
     * @param key - the keyboard key to check
     */
    isReleased(key: Key): boolean;
    /**
     * Checks if the provided keyboard key has been pressed/held down without release.
     *
     * @param key - the keyboard key to check
     */
    isPressedDown(key: Key): boolean;
    /**
     * Returns the current state of the provided key
     * @param key - the key to check
     */
    key(key: Key): KeyState;
    setup(element?: HTMLElement | null): void;
    pause(): void;
    resume(): void;
    update(): void;
    private static _fillKeys;
    private readonly _handlerDown;
    private readonly _handlerUp;
}