/**
 * DragSliceTool - Drag-based slice navigation
 *
 * Extracted from DragOperator.ts:
 * - updateIndex
 * - drawDragSlice
 * - drawMaskToLayerCtx
 * - cleanCanvases
 * - updateShowNumDiv / updateCurrentContrastSlice
 */
import { BaseTool } from "./BaseTool";
import type { ToolContext } from "./BaseTool";
import type { ILayerRenderTarget } from "../core/types";
import type { DragSliceHostDeps } from "./ToolHost";
interface IDragEffectCanvases {
    drawingCanvasLayerMaster: HTMLCanvasElement;
    displayCanvas: HTMLCanvasElement;
    layerTargets: Map<string, ILayerRenderTarget>;
    [key: string]: HTMLCanvasElement | Map<string, ILayerRenderTarget>;
}
export declare class DragSliceTool extends BaseTool {
    private callbacks;
    private showDragNumberDiv;
    private dragEffectCanvases;
    constructor(ctx: ToolContext, callbacks: DragSliceHostDeps, showDragNumberDiv: HTMLDivElement, dragEffectCanvases: IDragEffectCanvases);
    setShowDragNumberDiv(div: HTMLDivElement): void;
    updateIndex(move: number): void;
    private drawDragSlice;
    private cleanCanvases;
    updateShowNumDiv(contrastNum: number): void;
    updateCurrentContrastSlice(): any;
}
export {};