import ViewerEvent from '../../viewer/ViewerEvent';
import DraggableTool from '../DraggableTool';
import Viewer from '../../viewer/Viewer';
import { Tool } from '../Tool';
/**
 * PagerTool handles mouse drag and performs the paging of the stacked images.
 */
export default class PagerTool extends DraggableTool implements Tool {
    private currentStep;
    activate(viewer: Viewer): void;
    deactivate(viewer: Viewer): void;
    dragHandler(ev: ViewerEvent): void;
    dragStartHandler(ev: ViewerEvent): void;
    private translateBy;
}