@wordpress/block-editor/build-module/components/block-switcher/block-styles-menu.js

Generic block editor.

import { createElement } from "@wordpress/element";

/**
 * WordPress dependencies
 */
import { __ } from '@wordpress/i18n';
import { MenuGroup } from '@wordpress/components';
import { useState } from '@wordpress/element';
import { useSelect } from '@wordpress/data';
import { cloneBlock, getBlockFromExample, store as blocksStore } from '@wordpress/blocks';
/**
 * Internal dependencies
 */

import BlockStyles from '../block-styles';
import PreviewBlockPopover from './preview-block-popover';
export default function BlockStylesMenu({
  hoveredBlock,
  onSwitch
}) {
  const {
    name,
    clientId
  } = hoveredBlock;
  const [hoveredClassName, setHoveredClassName] = useState();
  const blockType = useSelect(select => select(blocksStore).getBlockType(name), [name]);
  return createElement(MenuGroup, {
    label: __('Styles'),
    className: "block-editor-block-switcher__styles__menugroup"
  }, hoveredClassName && createElement(PreviewBlockPopover, {
    blocks: blockType.example ? getBlockFromExample(blockType.name, {
      attributes: { ...blockType.example.attributes,
        className: hoveredClassName
      },
      innerBlocks: blockType.example.innerBlocks
    }) : cloneBlock(hoveredBlock, {
      className: hoveredClassName
    })
  }), createElement(BlockStyles, {
    clientId: clientId,
    onSwitch: onSwitch,
    onHoverClassName: setHoveredClassName,
    itemRole: "menuitem"
  }));
}
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