@ckeditor/ckeditor5-list/src/listproperties/liststartcommand.js

/**
 * @license Copyright (c) 2003-2023, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */
/**
 * @module list/listproperties/liststartcommand
 */
import { Command } from 'ckeditor5/src/core';
import { getSelectedListItems } from '../list/utils';
/**
 * The list start index command. It changes the `listStart` attribute of the selected list items.
 * It is used by the {@link module:list/listproperties~ListProperties list properties feature}.
 */
export default class ListStartCommand extends Command {
    /**
     * @inheritDoc
     */
    refresh() {
        const value = this._getValue();
        this.value = value;
        this.isEnabled = value != null;
    }
    /**
     * Executes the command.
     *
     * @fires execute
     * @param options.startIndex The list start index.
     */
    execute({ startIndex = 1 } = {}) {
        const model = this.editor.model;
        const listItems = getSelectedListItems(model)
            .filter(item => item.getAttribute('listType') == 'numbered');
        model.change(writer => {
            for (const item of listItems) {
                writer.setAttribute('listStart', startIndex >= 0 ? startIndex : 1, item);
            }
        });
    }
    /**
     * Checks the command's {@link #value}.
     *
     * @returns The current value.
     */
    _getValue() {
        const listItem = this.editor.model.document.selection.getFirstPosition().parent;
        if (listItem && listItem.is('element', 'listItem') && listItem.getAttribute('listType') == 'numbered') {
            return listItem.getAttribute('listStart');
        }
        return null;
    }
}