import * as OBC from '@thatopen/components';
export type NavigationMode = 'Orbit' | 'FirstPerson';
export declare const MIN_MOVE_SPEED = 1;
export declare const MAX_MOVE_SPEED = 10;
export declare const DEFAULT_MOVE_SPEED = 4;
export interface CameraNavigationState {
    mode: NavigationMode;
    moveSpeed: number;
    lockElevation: boolean;
}
/**
 * Walk-mode navigation for the BIM camera: the mode, the walk speed, an elevation lock and
 * WASD/arrow movement. Owns the loop so a closed sidebar cannot strand a held key.
 */
export declare class CameraNavigation extends OBC.Component implements OBC.Disposable {
    static readonly uuid: "6a4f1c92-7d38-4b5e-9f21-0c7ab3e5d184";
    readonly onChanged: OBC.Event<CameraNavigationState>;
    readonly onElevationChanged: OBC.Event<number>;
    readonly onDisposed: OBC.Event<unknown>;
    enabled: boolean;
    private currentMode;
    private currentMoveSpeed;
    private elevationLocked;
    private readonly pressed;
    private frameHandle;
    private lastFrame;
    private lockedElevation;
    private reportedElevation;
    constructor(components: OBC.Components);
    get state(): CameraNavigationState;
    get mode(): NavigationMode;
    /** First person cannot run under an orthographic lens, so it is refused rather than half-applied. */
    canUse(mode: NavigationMode): boolean;
    setMode(mode: NavigationMode): void;
    setMoveSpeed(moveSpeed: number): void;
    setLockElevation(lockElevation: boolean): void;
    /** Metres in world space, which for a Y-up scene is the camera's height. */
    get elevation(): number | null;
    setElevation(metres: number): void;
    dispose(): void;
    private publish;
    private camera;
    private controls;
    private applyMoveSpeed;
    private readonly onKeyDown;
    private readonly onKeyUp;
    private readonly releaseKeys;
    private startLoop;
    private stopLoop;
    private readonly step;
    private wake;
    private reportElevation;
    private walk;
    private holdElevation;
}
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