@wordpress/block-editor/build-module/components/block-list/use-in-between-inserter.js

Generic block editor.

/**
 * WordPress dependencies
 */
import { useRefEffect } from '@wordpress/compose';
import { useSelect, useDispatch } from '@wordpress/data';
import { useContext } from '@wordpress/element';
/**
 * Internal dependencies
 */

import { store as blockEditorStore } from '../../store';
import { InsertionPointOpenRef } from '../block-tools/insertion-point';
export function useInBetweenInserter() {
  const openRef = useContext(InsertionPointOpenRef);
  const {
    getBlockListSettings,
    getBlockRootClientId,
    getBlockIndex,
    isBlockInsertionPointVisible,
    isMultiSelecting
  } = useSelect(blockEditorStore);
  const {
    showInsertionPoint,
    hideInsertionPoint
  } = useDispatch(blockEditorStore);
  return useRefEffect(node => {
    function onMouseMove(event) {
      var _getBlockListSettings;

      if (openRef.current) {
        return;
      }

      if (isMultiSelecting()) {
        return;
      }

      if (!event.target.classList.contains('block-editor-block-list__layout')) {
        if (isBlockInsertionPointVisible()) {
          hideInsertionPoint();
        }

        return;
      }

      let rootClientId;

      if (!event.target.classList.contains('is-root-container')) {
        const blockElement = !!event.target.getAttribute('data-block') ? event.target : event.target.closest('[data-block]');
        rootClientId = blockElement.getAttribute('data-block');
      }

      const orientation = ((_getBlockListSettings = getBlockListSettings(rootClientId)) === null || _getBlockListSettings === void 0 ? void 0 : _getBlockListSettings.orientation) || 'vertical';
      const rect = event.target.getBoundingClientRect();
      const offsetTop = event.clientY - rect.top;
      const offsetLeft = event.clientX - rect.left;
      const children = Array.from(event.target.children);
      let element = children.find(blockEl => {
        return blockEl.classList.contains('wp-block') && orientation === 'vertical' && blockEl.offsetTop > offsetTop || blockEl.classList.contains('wp-block') && orientation === 'horizontal' && blockEl.offsetLeft > offsetLeft;
      });

      if (!element) {
        return;
      } // The block may be in an alignment wrapper, so check the first direct
      // child if the element has no ID.


      if (!element.id) {
        element = element.firstElementChild;

        if (!element) {
          return;
        }
      }

      const clientId = element.id.slice('block-'.length);

      if (!clientId) {
        return;
      }

      const elementRect = element.getBoundingClientRect();

      if (orientation === 'horizontal' && (event.clientY > elementRect.bottom || event.clientY < elementRect.top) || orientation === 'vertical' && (event.clientX > elementRect.right || event.clientX < elementRect.left)) {
        if (isBlockInsertionPointVisible()) {
          hideInsertionPoint();
        }

        return;
      }

      const index = getBlockIndex(clientId, rootClientId); // Don't show the in-between inserter before the first block in
      // the list (preserves the original behaviour).

      if (index === 0) {
        if (isBlockInsertionPointVisible()) {
          hideInsertionPoint();
        }

        return;
      }

      showInsertionPoint(rootClientId, index, {
        __unstableWithInserter: true
      });
    }

    node.addEventListener('mousemove', onMouseMove);
    return () => {
      node.removeEventListener('mousemove', onMouseMove);
    };
  }, [openRef, getBlockListSettings, getBlockRootClientId, getBlockIndex, isBlockInsertionPointVisible, isMultiSelecting, showInsertionPoint, hideInsertionPoint]);
}
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