import { Object3D } from 'three/webgpu';
import { DIVESelectable } from '../../../index.ts';
type SelectionChangeCallback = (selected: (Object3D & DIVESelectable) | null) => void;
/**
 * Manages selection state and notifies listeners on changes.
 *
 * Provides a centralized way to track what object is currently selected
 * and allows tools like TransformTool to react to selection changes.
 *
 * @module
 */
export declare class SelectionState {
    private _selected;
    private _listeners;
    /**
     * Currently selected object, or null if nothing is selected.
     */
    get selected(): (Object3D & DIVESelectable) | null;
    /**
     * Select an object. Deselects any previously selected object.
     * Calls onSelect on the new object and onDeselect on the previous.
     */
    select(obj: Object3D & DIVESelectable): void;
    /**
     * Deselect the currently selected object.
     * Calls onDeselect on the object.
     */
    deselect(): void;
    /**
     * Register a callback to be notified when selection changes.
     */
    onChange(callback: SelectionChangeCallback): void;
    /**
     * Unregister a previously registered callback.
     */
    offChange(callback: SelectionChangeCallback): void;
    /**
     * Dispose of the selection state and clear all listeners.
     */
    dispose(): void;
    private notifyListeners;
}
export {};