import { BaseViewerType } from '../_Base';
export declare class ViewerAudioController {
    private _viewer;
    private __iconContainer;
    private _onIcon;
    private _offIcon;
    constructor(_viewer: BaseViewerType);
    update(): void;
    unmount(): void;
    private _showIcon;
    private _hideIcon;
    private _iconContainer;
    private _createIconContainer;
    private _setIconContainerStyle;
    private offIcon;
    private onIcon;
    private _toggleSound;
    private _updateIcon;
}