import * as i0 from "@angular/core";
export interface DropEvent<T = unknown> {
    data: T;
    sourceElement: HTMLElement;
    targetElement: HTMLElement;
    x: number;
    y: number;
}
export declare class DragDropService {
    private readonly _drop$;
    private readonly _dragEnter$;
    private readonly _dragLeave$;
    readonly drop$: import("rxjs").Observable<DropEvent<unknown>>;
    readonly dragEnter$: import("rxjs").Observable<HTMLElement>;
    readonly dragLeave$: import("rxjs").Observable<HTMLElement>;
    private readonly droppableEls;
    private activeDroppableEl;
    private sourceEl;
    registerDroppable(el: HTMLElement): void;
    unregisterDroppable(el: HTMLElement): void;
    startDrag(sourceEl: HTMLElement): void;
    /** Called on every mousemove — detects enter/leave transitions. */
    updateDragPosition(x: number, y: number): void;
    /** Called on mouseup — emits the drop event and resets state. */
    endDrag(x: number, y: number, data: unknown): void;
    /**
     * Uses elementsFromPoint to find the topmost registered droppable at (x, y),
     * skipping the element being dragged itself.
     */
    private findDroppableAt;
    static ɵfac: i0.ɵɵFactoryDeclaration<DragDropService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<DragDropService>;
}