META-INF.resources.js.components.criteria_builder.EmptyDropZone.js Maven / Gradle / Ivy

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/**
 * SPDX-FileCopyrightText: (c) 2000 Liferay, Inc. https://liferay.com
 * SPDX-License-Identifier: LGPL-2.1-or-later OR LicenseRef-Liferay-DXP-EULA-2.0.0-2023-06
 */

import classNames from 'classnames';
import PropTypes from 'prop-types';
import React, {useEffect, useRef} from 'react';
import {DropTarget as dropTarget} from 'react-dnd';

import {
	POSITIONS,
	useMovementTarget,
} from '../../contexts/KeyboardMovementContext';
import {DragTypes} from '../../utils/dragTypes';
import getDropZoneElementClassName from '../../utils/getDropZoneElementClassName';
import EmptyPlaceholder from './EmptyPlaceholder.es';

/**
 * Prevents items from being dropped from other contributors.
 * This method must be called `canDrop`.
 * @param {Object} props Component's current props.
 * @param {DropTargetMonitor} monitor
 * @returns {boolean} True if the target should accept the item.
 */
function canDrop(props, monitor) {
	const {propertyKey: destPropertyKey} = props;
	const {propertyKey: startPropertyKey} = monitor.getItem();

	return destPropertyKey === startPropertyKey;
}

/**
 * Implements the behavior of what will occur when an item is dropped.
 * Adds the criterion dropped.
 * This method must be called `drop`.
 * @param {Object} props Component's current props.
 * @param {DropTargetMonitor} monitor
 */
function drop(props, monitor) {
	const {criterion} = monitor.getItem();

	props.onCriterionAdd(0, criterion);
}

function EmptyDropZone({
	canDrop,
	connectDropTarget,
	emptyContributors,
	hover,
	propertyKey,
}) {
	const movementTarget = useMovementTarget();

	const ref = useRef();

	const isKeyboardTarget = movementTarget?.groupId === 'root';

	const displayEmptyDropZone =
		canDrop || !emptyContributors || isKeyboardTarget;

	const dropZoneClassName = getDropZoneElementClassName(
		propertyKey,
		'root',
		0,
		POSITIONS.middle
	);

	useEffect(() => {
		if (isKeyboardTarget) {
			ref.current?.scrollIntoView?.({
				behavior: 'smooth',
				block: 'nearest',
				inline: 'nearest',
			});
		}
	}, [isKeyboardTarget]);

	return connectDropTarget(
		displayEmptyDropZone ? (
			
		) : (
			
				
			
		)
	);
}

EmptyDropZone.propTypes = {
	canDrop: PropTypes.bool,
	connectDropTarget: PropTypes.func,
	emptyContributors: PropTypes.bool,
	hover: PropTypes.bool,
	onCriterionAdd: PropTypes.func.isRequired,
	propertyKey: PropTypes.string.isRequired,
};

export default dropTarget(
	DragTypes.PROPERTY,
	{
		canDrop,
		drop,
	},
	(connect, monitor) => ({
		canDrop: monitor.canDrop(),
		connectDropTarget: connect.dropTarget(),
		hover: monitor.isOver(),
	})
)(EmptyDropZone);