/**
 * @license
 * Copyright 2021 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { Rect } from '../utils/rect.js';
import type { IComponent } from './i_component.js';
import { IDraggable } from './i_draggable.js';
/**
 * Interface for a component with custom behaviour when a block or bubble is
 * dragged over or dropped on top of it.
 */
export interface IDragTarget extends IComponent {
    /**
     * Returns the bounding rectangle of the drag target area in pixel units
     * relative to viewport.
     *
     * @returns The component's bounding box. Null if drag target area should be
     *     ignored.
     */
    getClientRect(): Rect | null;
    /**
     * Handles when a cursor with a block or bubble enters this drag target.
     *
     * @param dragElement The block or bubble currently being dragged.
     */
    onDragEnter(dragElement: IDraggable): void;
    /**
     * Handles when a cursor with a block or bubble is dragged over this drag
     * target.
     *
     * @param dragElement The block or bubble currently being dragged.
     */
    onDragOver(dragElement: IDraggable): void;
    /**
     * Handles when a cursor with a block or bubble exits this drag target.
     *
     * @param dragElement The block or bubble currently being dragged.
     */
    onDragExit(dragElement: IDraggable): void;
    /**
     * Handles when a block or bubble is dropped on this component.
     * Should not handle delete here.
     *
     * @param dragElement The block or bubble currently being dragged.
     */
    onDrop(dragElement: IDraggable): void;
    /**
     * Returns whether the provided block or bubble should not be moved after
     * being dropped on this component. If true, the element will return to where
     * it was when the drag started.
     *
     * @param dragElement The block or bubble currently being dragged.
     * @returns Whether the block or bubble provided should be returned to drag
     *     start.
     */
    shouldPreventMove(dragElement: IDraggable): boolean;
}
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