import DraggableTool from '../DraggableTool';
import ViewerEvent from '../../viewer/ViewerEvent';
import Viewer from '../../viewer/Viewer';
import { Tool } from '../Tool';
/**
 * WindowTool handles mouse drag and modifies the window level/width accordingly.
 */
export default class WindowTool extends DraggableTool implements Tool {
    activate(viewer: Viewer): void;
    deactivate(viewer: Viewer): void;
    dragHandler(ev: ViewerEvent): void;
}