Show patterns in inserter for non-root level insert destinations

packages/block-editor/src/components/inserter/block-patterns-tab.js

@@ -18,12 +18,14 @@ import usePatternsState from './hooks/use-patterns-state';
 import BlockPatternList from '../block-patterns-list';
 
 function BlockPatternsCategory( {
+	rootClientId,
 	onInsert,
 	selectedCategory,
 	onClickCategory,
 } ) {
 	const [ allPatterns, allCategories, onClick ] = usePatternsState(
-		onInsert
+		onInsert,
+		rootClientId
 	);
 
 	// Remove any empty categories
@@ -120,9 +122,15 @@ function BlockPatternsCategory( {
 	);
 }
 
-function BlockPatternsTabs( { onInsert, onClickCategory, selectedCategory } ) {
+function BlockPatternsTabs( {
+	rootClientId,
+	onInsert,
+	onClickCategory,
+	selectedCategory,
+} ) {
 	return (
 		<BlockPatternsCategory
+			rootClientId={ rootClientId }
 			selectedCategory={ selectedCategory }
 			onInsert={ onInsert }
 			onClickCategory={ onClickCategory }

packages/block-editor/src/components/inserter/hooks/use-patterns-state.js

@@ -15,21 +15,25 @@ import { store as noticesStore } from '@wordpress/notices';
 /**
  * Retrieves the block patterns inserter state.
  *
- * @param {Function} onInsert function called when inserter a list of blocks.
+ * @param {Function} onInsert     function called when inserter a list of blocks.
+ * @param {string=}  rootClientId Insertion's root client ID.
  *
  * @return {Array} Returns the patterns state. (patterns, categories, onSelect handler)
  */
-const usePatternsState = ( onInsert ) => {
-	const { patternCategories, patterns } = useSelect( ( select ) => {
-		const {
-			__experimentalBlockPatterns,
-			__experimentalBlockPatternCategories,
-		} = select( 'core/block-editor' ).getSettings();
-		return {
-			patterns: __experimentalBlockPatterns,
-			patternCategories: __experimentalBlockPatternCategories,
-		};
-	}, [] );
+const usePatternsState = ( onInsert, rootClientId ) => {
+	const { patternCategories, patterns } = useSelect(
+		( select ) => {
+			const { __experimentalGetAllowedPatterns, getSettings } = select(
+				'core/block-editor'
+			);
+			return {
+				patterns: __experimentalGetAllowedPatterns( rootClientId ),
+				patternCategories: getSettings()
+					.__experimentalBlockPatternCategories,
+			};
+		},
+		[ rootClientId ]
+	);
 	const { createSuccessNotice } = useDispatch( noticesStore );
 	const onClickPattern = useCallback( ( pattern, blocks ) => {
 		onInsert(

packages/block-editor/src/components/inserter/menu.js

@@ -46,19 +46,24 @@ function InserterMenu( {
 		selectBlockOnInsert: __experimentalSelectBlockOnInsert,
 		insertionIndex: __experimentalInsertionIndex,
 	} );
-	const { hasPatterns, hasReusableBlocks } = useSelect( ( select ) => {
-		const {
-			__experimentalBlockPatterns,
-			__experimentalReusableBlocks,
-		} = select( 'core/block-editor' ).getSettings();
+	const { showPatterns, hasReusableBlocks } = useSelect(
+		( select ) => {
+			const { __experimentalGetAllowedPatterns, getSettings } = select(
+				'core/block-editor'
+			);
 
-		return {
-			hasPatterns: !! __experimentalBlockPatterns?.length,
-			hasReusableBlocks: !! __experimentalReusableBlocks?.length,
-		};
-	}, [] );
-
-	const showPatterns = ! destinationRootClientId && hasPatterns;
+			return {
+				showPatterns:
+					! destinationRootClientId ||
+					!! __experimentalGetAllowedPatterns(
+						destinationRootClientId
+					).length,
+				hasReusableBlocks: !! getSettings().__experimentalReusableBlocks
+					?.length,
+			};
+		},
+		[ destinationRootClientId ]
+	);
 
 	const onInsert = useCallback(
 		( blocks ) => {
@@ -125,12 +130,18 @@ function InserterMenu( {
 	const patternsTab = useMemo(
 		() => (
 			<BlockPatternsTabs
+				rootClientId={ destinationRootClientId }
 				onInsert={ onInsertPattern }
 				onClickCategory={ onClickPatternCategory }
 				selectedCategory={ selectedPatternCategory }
 			/>
 		),
-		[ onInsertPattern, onClickPatternCategory, selectedPatternCategory ]
+		[
+			destinationRootClientId,
+			onInsertPattern,
+			onClickPatternCategory,
+			selectedPatternCategory,
+		]
 	);
 
 	const reusableBlocksTab = useMemo(

packages/block-editor/src/components/inserter/quick-inserter.js

@@ -44,9 +44,11 @@ export default function QuickInserter( {
 		onInsertBlocks
 	);
 
-	const [ patterns ] = usePatternsState( onInsertBlocks );
-	const showPatterns =
-		! destinationRootClientId && patterns.length && !! filterValue;
+	const [ patterns ] = usePatternsState(
+		onInsertBlocks,
+		destinationRootClientId
+	);
+	const showPatterns = patterns.length && !! filterValue;
 	const showSearch =
 		( showPatterns && patterns.length > SEARCH_THRESHOLD ) ||
 		blockTypes.length > SEARCH_THRESHOLD;

packages/block-editor/src/components/inserter/search-results.js

@@ -54,7 +54,8 @@ function InserterSearchResults( {
 		onSelectBlockType,
 	] = useBlockTypesState( destinationRootClientId, onInsertBlocks );
 	const [ patterns, , onSelectBlockPattern ] = usePatternsState(
-		onInsertBlocks
+		onInsertBlocks,
+		destinationRootClientId
 	);
 
 	const filteredBlockTypes = useMemo( () => {

packages/block-editor/src/store/selectors.js

@@ -15,6 +15,7 @@ import {
 	filter,
 	mapKeys,
 	orderBy,
+	every,
 } from 'lodash';
 import createSelector from 'rememo';
 
@@ -1735,6 +1736,50 @@ export const __experimentalGetAllowedBlocks = createSelector(
 	]
 );
 
+const __experimentalGetParsedPatterns = createSelector(
+	( state ) => {
+		const patterns = state.settings.__experimentalBlockPatterns;
+		return map( patterns, ( pattern ) => ( {
+			...pattern,
+			contentBlocks: parse( pattern.content ),
+		} ) );
+	},
+	( state ) => [ state.settings.__experimentalBlockPatterns ]
+);
+
+/**
+ * Returns the list of allowed patterns for inner blocks children
+ *
+ * @param {Object}  state        Editor state.
+ * @param {?string} rootClientId Optional target root client ID.
+ *
+ * @return {Array?} The list of allowed block types.
+ */
+export const __experimentalGetAllowedPatterns = createSelector(
+	( state, rootClientId = null ) => {
+		const patterns = __experimentalGetParsedPatterns( state );
+
+		if ( ! rootClientId ) {
+			return patterns;
+		}
+
+		const patternsAllowed = filter( patterns, ( { contentBlocks } ) => {
+			return every( contentBlocks, ( { name } ) =>
+				canInsertBlockType( state, name, rootClientId )
+			);
+		} );
+
+		return patternsAllowed;
+	},
+	( state, rootClientId ) => [
+		state.settings.__experimentalBlockPatterns,
+		state.settings.allowedBlockTypes,
+		state.settings.templateLock,
+		state.blockListSettings[ rootClientId ],
+		state.blocks.byClientId[ rootClientId ],
+	]
+);
+
 /**
  * Returns the Block List settings of a block, if any exist.
  *

packages/block-editor/src/store/test/selectors.js

@@ -71,6 +71,7 @@ const {
 	getLowestCommonAncestorWithSelectedBlock,
 	__experimentalGetActiveBlockIdByBlockNames: getActiveBlockIdByBlockNames,
 	__experimentalGetParsedReusableBlock,
+	__experimentalGetAllowedPatterns,
 } = selectors;
 
 describe( 'selectors', () => {
@@ -3349,6 +3350,58 @@ describe( 'selectors', () => {
 			).toEqual( 'client-id-03' );
 		} );
 	} );
+
+	describe( '__experimentalGetAllowedPatterns', () => {
+		const state = {
+			blocks: {
+				byClientId: {
+					block1: { name: 'core/test-block-a' },
+					block2: { name: 'core/test-block-b' },
+				},
+				attributes: {
+					block1: {},
+					block2: {},
+				},
+			},
+			blockListSettings: {
+				block1: {
+					allowedBlocks: [ 'core/test-block-b' ],
+				},
+				block2: {
+					allowedBlocks: [],
+				},
+			},
+			settings: {
+				__experimentalBlockPatterns: [
+					{
+						title: 'pattern with a',
+						content: `<!-- wp:test-block-a --><!-- /wp:test-block-a -->`,
+					},
+					{
+						title: 'pattern with b',
+						content:
+							'<!-- wp:test-block-b --><!-- /wp:test-block-b -->',
+					},
+				],
+			},
+		};
+
+		it( 'should return all patterns for root level', () => {
+			expect(
+				__experimentalGetAllowedPatterns( state, null )
+			).toHaveLength( 2 );
+		} );
+
+		it( 'should return patterns that consists of blocks allowed for the specified client ID', () => {
+			expect(
+				__experimentalGetAllowedPatterns( state, 'block1' )
+			).toHaveLength( 1 );
+
+			expect(
+				__experimentalGetAllowedPatterns( state, 'block2' )
+			).toHaveLength( 0 );
+		} );
+	} );
 } );
 
 describe( '__experimentalGetParsedReusableBlock', () => {

packages/edit-post/src/editor.js

@@ -82,6 +82,10 @@ function Editor( {
 		const isFSETheme = getEditorSettings().isFSETheme;
 		const isViewable = getPostType( postType )?.viewable ?? false;
 
+		// Prefetch and parse patterns. This ensures patterns are loaded and parsed when
+		// the editor is loaded rather than degrading the performance of the inserter.
+		select( 'core/block-editor' ).__experimentalGetAllowedPatterns();
+
 		return {
 			hasFixedToolbar:
 				isFeatureActive( 'fixedToolbar' ) ||

packages/edit-site/src/components/editor/index.js

@@ -71,6 +71,10 @@ function Editor() {
 		const postType = getEditedPostType();
 		const postId = getEditedPostId();
 
+		// Prefetch and parse patterns. This ensures patterns are loaded and parsed when
+		// the editor is loaded rather than degrading the performance of the inserter.
+		select( 'core/block-editor' ).__experimentalGetAllowedPatterns();
+
 		// The currently selected entity to display. Typically template or template part.
 		return {
 			isInserterOpen: isInserterOpened(),