import { ExtensionBase } from '../ExtensionBase';
export type AreaSelectionMode = "lasso" | "box";
export type { SelectionBehavior } from './computeSelectedElements';
export declare class AreaSelectionState {
    enabled: boolean;
    mode: AreaSelectionMode;
    /** When true, selection updates live while dragging. */
    liveUpdate: boolean;
}
/**
 * Extension that provides lasso and box area selection in the 3D viewer.
 *
 * When enabled, left-click + drag draws a lasso or box selection region.
 * On release, elements within the region are selected via SceneManager.updateSelection().
 * Hold Ctrl/Meta to add to existing selection.
 */
export declare class AreaSelectionExtension extends ExtensionBase {
    static getName: () => string;
    state: AreaSelectionState;
    private tool;
    private overlay;
    private isDragging;
    private startX;
    private startY;
    private currentBehavior;
    private additive;
    private substractive;
    private invertBehavior;
    private readonly boundPointerDown;
    private readonly boundPointerMove;
    private readonly boundPointerUp;
    private readonly boundResize;
    private readonly boundKeyDown;
    private ac;
    private renderManager;
    private sharedToolbar;
    constructor(viewerName: string, options: {
        saveStateHandler?: (stateName: string, state: any) => void;
        restoreStateHandler?: (stateName: string, state: any) => Promise<any>;
    });
    setMode(mode: AreaSelectionMode): void;
    enable(): void;
    disable(): void;
    toggle(): void;
    private onPointerDown;
    private onPointerMove;
    private onPointerUp;
    private applySelection;
    private onResize;
    private onKeyDown;
    private onKeyUp;
    sharedToolbarRender(container: HTMLElement): void;
    added(): Promise<void>;
    deleted(): void;
}