import { IKnobWidget } from '../types/widgets';
import { BaseWidget, DrawWidgetOptions, WidgetEventOptions } from './BaseWidget';
export declare class KnobWidget extends BaseWidget<IKnobWidget> implements IKnobWidget {
    type: "knob";
    /**
     * Compute the layout size of the widget.
     * @returns The layout size of the widget.
     */
    computeLayoutSize(): {
        minHeight: number;
        maxHeight?: number;
        minWidth: number;
        maxWidth?: number;
    };
    get height(): number;
    drawWidget(ctx: CanvasRenderingContext2D, { width, showText, }: DrawWidgetOptions): void;
    onClick(): void;
    current_drag_offset: number;
    onDrag(options: WidgetEventOptions): void;
}