import { HandlerObject } from '../../base/handler-object';
export declare class ScrollWheelZoomHandler extends HandlerObject {
    _delta: number;
    _startTime: number;
    _timer: number;
    _lastMousePos: any;
    addHooks(): void;
    removeHooks(): void;
    _onWheelScroll(e: any): void;
    _performZoom(): void;
}