@wordpress/block-editor/build-module/components/block-list/use-block-props/use-is-hovered.js

Generic block editor.

/**
 * WordPress dependencies
 */
import { useRefEffect } from '@wordpress/compose';
import { useDispatch } from '@wordpress/data';

/**
 * Internal dependencies
 */
import { store as blockEditorStore } from '../../../store';

/*
 * Adds `is-hovered` class when the block is hovered and in navigation or
 * outline mode.
 */
export function useIsHovered({
  clientId
}) {
  const {
    hoverBlock
  } = useDispatch(blockEditorStore);
  function listener(event) {
    if (event.defaultPrevented) {
      return;
    }
    const action = event.type === 'mouseover' ? 'add' : 'remove';
    event.preventDefault();
    event.currentTarget.classList[action]('is-hovered');
    if (action === 'add') {
      hoverBlock(clientId);
    } else {
      hoverBlock(null);
    }
  }
  return useRefEffect(node => {
    node.addEventListener('mouseout', listener);
    node.addEventListener('mouseover', listener);
    return () => {
      node.removeEventListener('mouseout', listener);
      node.removeEventListener('mouseover', listener);

      // Remove class in case it lingers.
      node.classList.remove('is-hovered');
      hoverBlock(null);
    };
  }, []);
}
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