@wordpress/block-editor/build-module/components/block-toolbar/use-has-block-toolbar.js

Generic block editor.

/**
 * WordPress dependencies
 */
import { useSelect } from '@wordpress/data';
import { getBlockType, hasBlockSupport } from '@wordpress/blocks';
/**
 * Internal dependencies
 */
import { store as blockEditorStore } from '../../store';

/**
 * Returns true if the block toolbar should be shown.
 *
 * @return {boolean} Whether the block toolbar component will be rendered.
 */
export function useHasBlockToolbar() {
  const enabled = useSelect(select => {
    const {
      getBlockEditingMode,
      getBlockName,
      getBlockSelectionStart
    } = select(blockEditorStore);

    // we only care about the 1st selected block
    // for the toolbar, so we use getBlockSelectionStart
    // instead of getSelectedBlockClientIds
    const selectedBlockClientId = getBlockSelectionStart();
    const blockType = selectedBlockClientId && getBlockType(getBlockName(selectedBlockClientId));
    return blockType && hasBlockSupport(blockType, '__experimentalToolbar', true) && getBlockEditingMode(selectedBlockClientId) !== 'disabled';
  }, []);
  return enabled;
}
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