@wordpress/block-editor/build-module/components/block-controls/slot.js

Generic block editor.

import _extends from "@babel/runtime/helpers/esm/extends";
import { createElement } from "@wordpress/element";

/**
 * WordPress dependencies
 */
import { useContext, useMemo } from '@wordpress/element';
import { privateApis, __experimentalToolbarContext as ToolbarContext, ToolbarGroup, __experimentalUseSlotFills as useSlotFills } from '@wordpress/components';
import warning from '@wordpress/warning';
/**
 * Internal dependencies
 */

import groups from './groups';
import { unlock } from '../../lock-unlock';
const {
  ComponentsContext
} = unlock(privateApis);
export default function BlockControlsSlot({
  group = 'default',
  ...props
}) {
  const toolbarState = useContext(ToolbarContext);
  const contextState = useContext(ComponentsContext);
  const fillProps = useMemo(() => ({
    forwardedContext: [[ToolbarContext.Provider, {
      value: toolbarState
    }], [ComponentsContext.Provider, {
      value: contextState
    }]]
  }), [toolbarState, contextState]);
  const Slot = groups[group]?.Slot;
  const fills = useSlotFills(Slot?.__unstableName);

  if (!Slot) {
    typeof process !== "undefined" && process.env && process.env.NODE_ENV !== "production" ? warning(`Unknown BlockControls group "${group}" provided.`) : void 0;
    return null;
  }

  if (!fills?.length) {
    return null;
  }

  const slot = createElement(Slot, _extends({}, props, {
    bubblesVirtually: true,
    fillProps: fillProps
  }));

  if (group === 'default') {
    return slot;
  }

  return createElement(ToolbarGroup, null, slot);
}
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