import { ConnectionPoint, Point } from '../types';
import * as i0 from "@angular/core";
/**
 * Lightweight signal-based service for communicating arrow-connection UI state
 * from tools (ArrowTool, SelectTool) to the canvas component.
 */
export declare class ConnectionUIService {
    /** Snap indicator position – shown when cursor is near a connectable shape */
    private readonly _snapIndicator;
    readonly snapIndicator: import("@angular/core").Signal<Point | null>;
    /** Connection points currently visible (hovered connectable shapes) */
    private readonly _visibleConnectionPoints;
    readonly visibleConnectionPoints: import("@angular/core").Signal<ConnectionPoint[]>;
    setSnapIndicator(point: Point | null): void;
    setVisibleConnectionPoints(points: ConnectionPoint[]): void;
    /** Clear all UI hints (called when tool finishes or deactivates) */
    clearAll(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<ConnectionUIService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ConnectionUIService>;
}