Template Parts & Reusable Blocks - try overlay element for clickthrough to edit pattern.

packages/base-styles/_functions.scss

@@ -0,0 +1,9 @@
+/**
+*  Converts a hex value into the rgb equivalent.
+*
+* @param {string} hex - the hexadecimal value to convert
+* @return {string} comma separated rgb values
+*/
+@function hex-to-rgb($hex) {
+	@return red($hex), green($hex), blue($hex);
+}

packages/base-styles/_mixins.scss

@@ -1,3 +1,5 @@
+@import "./functions";
+
 /**
  * Breakpoint mixins
  */
@@ -440,11 +442,15 @@
 }
 
 @mixin admin-scheme($color-primary) {
+	// Define RGB equivalents for use in rgba function.
+	// Hexadecimal css vars do not work in the rgba function.
 	--wp-admin-theme-color: #{$color-primary};
-
+	--wp-admin-theme-color--rgb: #{hex-to-rgb($color-primary)};
 	// Darker shades.
 	--wp-admin-theme-color-darker-10: #{darken($color-primary, 5%)};
+	--wp-admin-theme-color-darker-10--rgb: #{hex-to-rgb(darken($color-primary, 5%))};
 	--wp-admin-theme-color-darker-20: #{darken($color-primary, 10%)};
+	--wp-admin-theme-color-darker-20--rgb: #{hex-to-rgb(darken($color-primary, 10%))};
 
 	// Focus style width.
 	// Avoid rounding issues by showing a whole 2px for 1x screens, and 1.5px on high resolution screens.

packages/base-styles/_z-index.scss

@@ -73,6 +73,9 @@ $z-layers: (
 	// The toolbar, when contextual, should be above any adjacent nested block click overlays.
 	".block-editor-block-contextual-toolbar": 61,
 
+	// Ensures content overlay appears higher than resize containers used for image/video/etc.
+	".block-editor-block-content-overlay__overlay": 10,
+
 	// The block mover, particularly in nested contexts,
 	// should overlap most block content.
 	".block-editor-block-list__block.is-{selected,hovered} .block-editor-block-mover": 61,

packages/block-editor/src/components/block-content-overlay/index.js

@@ -0,0 +1,101 @@
+/**
+ * WordPress dependencies
+ */
+import { useSelect } from '@wordpress/data';
+import { useState, useEffect } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import { store as blockEditorStore } from '../../store';
+
+/**
+ * External dependencies
+ */
+import classnames from 'classnames';
+
+export default function BlockContentOverlay( {
+	clientId,
+	tagName: TagName = 'div',
+	wrapperProps,
+	className,
+} ) {
+	const baseClassName = 'block-editor-block-content-overlay';
+	const [ isOverlayActive, setIsOverlayActive ] = useState( true );
+	const [ isHovered, setIsHovered ] = useState( false );
+
+	const {
+		isParentSelected,
+		hasChildSelected,
+		isDraggingBlocks,
+		isParentHighlighted,
+	} = useSelect(
+		( select ) => {
+			const {
+				isBlockSelected,
+				hasSelectedInnerBlock,
+				isDraggingBlocks: _isDraggingBlocks,
+				isBlockHighlighted,
+			} = select( blockEditorStore );
+			return {
+				isParentSelected: isBlockSelected( clientId ),
+				hasChildSelected: hasSelectedInnerBlock( clientId, true ),
+				isDraggingBlocks: _isDraggingBlocks(),
+				isParentHighlighted: isBlockHighlighted( clientId ),
+			};
+		},
+		[ clientId ]
+	);
+
+	const classes = classnames(
+		baseClassName,
+		wrapperProps?.className,
+		className,
+		{
+			'overlay-active': isOverlayActive,
+			'parent-highlighted': isParentHighlighted,
+			'is-dragging-blocks': isDraggingBlocks,
+		}
+	);
+
+	useEffect( () => {
+		// Reenable when blocks are not in use.
+		if ( ! isParentSelected && ! hasChildSelected && ! isOverlayActive ) {
+			setIsOverlayActive( true );
+		}
+		// Disable if parent selected by another means (such as list view).
+		// We check hover to ensure the overlay click interaction is not taking place.
+		// Trying to click the overlay will select the parent block via its 'focusin'
+		// listener on the wrapper, so if the block is selected while hovered we will
+		// let the mouseup disable the overlay instead.
+		if ( isParentSelected && ! isHovered && isOverlayActive ) {
+			setIsOverlayActive( false );
+		}
+		// Ensure overlay is disabled if a child block is selected.
+		if ( hasChildSelected && isOverlayActive ) {
+			setIsOverlayActive( false );
+		}
+	}, [ isParentSelected, hasChildSelected, isOverlayActive, isHovered ] );
+
+	// Disabled because the overlay div doesn't actually have a role or functionality
+	// as far as the a11y is concerned. We're just catching the first click so that
+	// the block can be selected without interacting with its contents.
+	/* eslint-disable jsx-a11y/no-static-element-interactions */
+	return (
+		<TagName
+			{ ...wrapperProps }
+			className={ classes }
+			onMouseEnter={ () => setIsHovered( true ) }
+			onMouseLeave={ () => setIsHovered( false ) }
+		>
+			{ isOverlayActive && (
+				<div
+					className={ `${ baseClassName }__overlay` }
+					onMouseUp={ () => setIsOverlayActive( false ) }
+				/>
+			) }
+			{ wrapperProps?.children }
+		</TagName>
+	);
+}
+/* eslint-enable jsx-a11y/no-static-element-interactions */

packages/block-editor/src/components/block-content-overlay/style.scss

@@ -0,0 +1,41 @@
+// Specificity required to ensure overlay width is not restricted to that
+// of standard block content.  The overlay's width should be as wide as
+// its children require.
+.editor-styles-wrapper .wp-block .block-editor-block-content-overlay__overlay {
+	max-width: none;
+}
+
+.block-editor-block-content-overlay {
+	.block-editor-block-content-overlay__overlay {
+		position: absolute;
+		top: 0;
+		left: 0;
+		width: 100%;
+		height: 100%;
+		background: transparent;
+		border: none;
+		border-radius: $radius-block-ui;
+		z-index: z-index(".block-editor-block-content-overlay__overlay");
+	}
+
+	&:hover:not(.is-dragging-blocks),
+	&.parent-highlighted {
+		> .block-editor-block-content-overlay__overlay {
+			background: rgba(var(--wp-admin-theme-color--rgb), 0.1);
+			box-shadow: 0 0 0 $border-width var(--wp-admin-theme-color) inset;
+		}
+	}
+
+	&.overlay-active:not(.is-dragging-blocks) {
+		*:not(.block-editor-block-content-overlay__overlay) {
+			pointer-events: none;
+		}
+	}
+
+	&.is-dragging-blocks {
+		box-shadow: 0 0 0 $border-width var(--wp-admin-theme-color);
+		.block-editor-block-content-overlay__overlay {
+			pointer-events: none;
+		}
+	}
+}

packages/block-editor/src/components/index.js

@@ -14,6 +14,7 @@ export {
 export { default as __experimentalBlockFullHeightAligmentControl } from './block-full-height-alignment-control';
 export { default as __experimentalBlockAlignmentMatrixControl } from './block-alignment-matrix-control';
 export { default as BlockBreadcrumb } from './block-breadcrumb';
+export { default as __experimentalBlockContentOverlay } from './block-content-overlay';
 export { BlockContextProvider } from './block-context';
 export {
 	default as BlockControls,

packages/block-editor/src/style.scss

@@ -15,6 +15,7 @@
 @import "./components/block-breadcrumb/style.scss";
 @import "./components/block-card/style.scss";
 @import "./components/block-compare/style.scss";
+@import "./components/block-content-overlay/style.scss";
 @import "./components/block-draggable/style.scss";
 @import "./components/block-mobile-toolbar/style.scss";
 @import "./components/block-mover/style.scss";

packages/block-library/src/block/edit.js

@@ -19,6 +19,7 @@ import { __ } from '@wordpress/i18n';
 import {
 	__experimentalUseInnerBlocksProps as useInnerBlocksProps,
 	__experimentalUseNoRecursiveRenders as useNoRecursiveRenders,
+	__experimentalBlockContentOverlay as BlockContentOverlay,
 	InnerBlocks,
 	BlockControls,
 	InspectorControls,
@@ -70,6 +71,8 @@ export default function ReusableBlockEdit( { attributes: { ref }, clientId } ) {
 		ref
 	);
 
+	const blockProps = useBlockProps();
+
 	const innerBlocksProps = useInnerBlocksProps(
 		{},
 		{
@@ -82,8 +85,6 @@ export default function ReusableBlockEdit( { attributes: { ref }, clientId } ) {
 		}
 	);
 
-	const blockProps = useBlockProps();
-
 	if ( hasAlreadyRendered ) {
 		return (
 			<div { ...blockProps }>
@@ -136,9 +137,11 @@ export default function ReusableBlockEdit( { attributes: { ref }, clientId } ) {
 						/>
 					</PanelBody>
 				</InspectorControls>
-				<div className="block-library-block__reusable-block-container">
-					{ <div { ...innerBlocksProps } /> }
-				</div>
+				<BlockContentOverlay
+					clientId={ clientId }
+					wrapperProps={ innerBlocksProps }
+					className="block-library-block__reusable-block-container"
+				/>
 			</div>
 		</RecursionProvider>
 	);

packages/block-library/src/template-part/edit/index.js

@@ -192,6 +192,7 @@ export default function TemplatePartEdit( {
 			) }
 			{ isEntityAvailable && (
 				<TemplatePartInnerBlocks
+					clientId={ clientId }
 					tagName={ TagName }
 					blockProps={ blockProps }
 					postId={ templatePartId }

packages/block-library/src/template-part/edit/inner-blocks.js

@@ -5,6 +5,7 @@ import { useEntityBlockEditor } from '@wordpress/core-data';
 import {
 	InnerBlocks,
 	__experimentalUseInnerBlocksProps as useInnerBlocksProps,
+	__experimentalBlockContentOverlay as BlockContentOverlay,
 	useSetting,
 	store as blockEditorStore,
 } from '@wordpress/block-editor';
@@ -15,8 +16,9 @@ export default function TemplatePartInnerBlocks( {
 	postId: id,
 	hasInnerBlocks,
 	layout,
-	tagName: TagName,
+	tagName,
 	blockProps,
+	clientId,
 } ) {
 	const themeSupportsLayout = useSelect( ( select ) => {
 		const { getSettings } = select( blockEditorStore );
@@ -45,6 +47,7 @@ export default function TemplatePartInnerBlocks( {
 		'wp_template_part',
 		{ id }
 	);
+
 	const innerBlocksProps = useInnerBlocksProps( blockProps, {
 		value: blocks,
 		onInput,
@@ -54,5 +57,12 @@ export default function TemplatePartInnerBlocks( {
 			: InnerBlocks.ButtonBlockAppender,
 		__experimentalLayout: _layout,
 	} );
-	return <TagName { ...innerBlocksProps } />;
+
+	return (
+		<BlockContentOverlay
+			clientId={ clientId }
+			tagName={ tagName }
+			wrapperProps={ innerBlocksProps }
+		/>
+	);
 }

packages/e2e-test-utils/src/inserter.js

@@ -196,7 +196,7 @@ export async function insertReusableBlock( searchTerm ) {
 	await waitForInserterCloseAndContentFocus();
 	// We should wait until the block is loaded
 	await page.waitForXPath(
-		'//*[@class="block-library-block__reusable-block-container"]'
+		'//*[contains(@class,"block-library-block__reusable-block-container")]'
 	);
 }
 

packages/e2e-tests/specs/experiments/multi-entity-editing.test.js

@@ -10,6 +10,7 @@ import {
 	canvas,
 	openDocumentSettingsSidebar,
 	pressKeyWithModifier,
+	selectBlockByClientId,
 } from '@wordpress/e2e-test-utils';
 
 /**
@@ -218,7 +219,7 @@ describe( 'Multi-entity editor states', () => {
 			removeErrorMocks();
 		} );
 
-		afterEach( async () => {
+		const saveAndWaitResponse = async () => {
 			await Promise.all( [
 				saveAllEntities(),
 
@@ -241,7 +242,7 @@ describe( 'Multi-entity editor states', () => {
 				} ),
 			] );
 			removeErrorMocks();
-		} );
+		};
 
 		it( 'should only dirty the parent entity when editing the parent', async () => {
 			// Clear selection so that the block is not added to the template part.
@@ -253,9 +254,12 @@ describe( 'Multi-entity editor states', () => {
 			expect( await isEntityDirty( templateName ) ).toBe( true );
 			expect( await isEntityDirty( templatePartName ) ).toBe( false );
 			expect( await isEntityDirty( nestedTPName ) ).toBe( false );
+			await saveAndWaitResponse();
 		} );
 
 		it( 'should only dirty the child when editing the child', async () => {
+			// Select parent TP to unlock selecting content.
+			await canvas().click( '.wp-block-template-part' );
 			await canvas().click(
 				'.wp-block-template-part .wp-block[data-type="core/paragraph"]'
 			);
@@ -264,9 +268,16 @@ describe( 'Multi-entity editor states', () => {
 			expect( await isEntityDirty( templateName ) ).toBe( false );
 			expect( await isEntityDirty( templatePartName ) ).toBe( true );
 			expect( await isEntityDirty( nestedTPName ) ).toBe( false );
+			await saveAndWaitResponse();
 		} );
 
 		it( 'should only dirty the nested entity when editing the nested entity', async () => {
+			// Select parent TP to unlock selecting child.
+			await canvas().click( '.wp-block-template-part' );
+			// Select child TP to unlock selecting content.
+			await canvas().click(
+				'.wp-block-template-part .wp-block-template-part'
+			);
 			await canvas().click(
 				'.wp-block-template-part .wp-block-template-part .wp-block[data-type="core/paragraph"]'
 			);
@@ -275,6 +286,21 @@ describe( 'Multi-entity editor states', () => {
 			expect( await isEntityDirty( templateName ) ).toBe( false );
 			expect( await isEntityDirty( templatePartName ) ).toBe( false );
 			expect( await isEntityDirty( nestedTPName ) ).toBe( true );
+			await saveAndWaitResponse();
+		} );
+
+		it( 'should not allow selecting template part content without parent selected', async () => {
+			// Unselect blocks.
+			await selectBlockByClientId();
+			// Try to select a child block of a template part.
+			await canvas().click(
+				'.wp-block-template-part .wp-block-template-part .wp-block[data-type="core/paragraph"]'
+			);
+
+			const selectedBlock = await page.evaluate( () => {
+				return wp.data.select( 'core/block-editor' ).getSelectedBlock();
+			} );
+			expect( selectedBlock?.name ).toBe( 'core/template-part' );
 		} );
 	} );
 } );

packages/e2e-tests/specs/experiments/multi-entity-saving.test.js

@@ -105,8 +105,6 @@ describe( 'Multi-entity save flow', () => {
 			);
 			await createNewButton.click();
 			await page.waitForSelector( activatedTemplatePartSelector );
-			await page.keyboard.press( 'Tab' );
-			await page.keyboard.type( 'test-template-part' );
 			await page.click( '.block-editor-button-block-appender' );
 			await page.click( '.editor-block-list-item-paragraph' );
 			await page.keyboard.type( 'some words...' );
@@ -163,6 +161,9 @@ describe( 'Multi-entity save flow', () => {
 
 			// Update template part.
 			await page.click( templatePartSelector );
+			await page.click(
+				`${ templatePartSelector } .wp-block[data-type="core/paragraph"]`
+			);
 			await page.keyboard.type( '...some more words...' );
 			await page.keyboard.press( 'Enter' );