import { LayoutEngine } from '../virtualization/LayoutEngine';
import { Column } from '../models/Column';
/**
 * Drag a column header to reorder columns. A press that moves past the threshold
 * starts a drag, shows a drop marker at the nearest column boundary, and commits
 * the move on release.
 */
export declare class ColumnDragger {
    private header;
    private layout;
    private columns;
    private commit;
    private groupZone?;
    private onGroupBy?;
    private onGroupHover?;
    private srcCol;
    private startX;
    private dragging;
    private overZone;
    private marker;
    private ghost?;
    private insertAt;
    private readonly onDown;
    private readonly onMove;
    private readonly onUp;
    constructor(header: HTMLElement, layout: LayoutEngine, columns: () => Column[], commit: (from: number, to: number) => void, groupZone?: (() => DOMRect | null) | undefined, onGroupBy?: ((col: number) => void) | undefined, onGroupHover?: ((active: boolean) => void) | undefined);
    dispose(): void;
    private showGhost;
    private moveGhost;
    private removeGhost;
    private contentX;
    private colAt;
    private isEdge;
    private isOverGroupZone;
}