import { ISurfaceContext } from '@devexpress/analytics-core/analytics-elements';
import * as ko from 'knockout';
import { XRControlSurface } from './xrControl';
import { XRRichViewModel } from './xrRichText';
export declare class XRRichSurface extends XRControlSurface {
    private _primaryProperties;
    private _secondaryPropertiesChangedRequest;
    private _lastRequestedProperty;
    private _innerUpdate;
    private _sendCallback;
    constructor(control: XRRichViewModel, context: ISurfaceContext);
    hasContentBinding: ko.PureComputed<boolean>;
    imageSrc: ko.Observable<string>;
    isLoading: ko.Observable<boolean>;
    dragDropFileEnabled: ko.Observable<boolean>;
}