feat: Add slide template picker and templates for carousel block

package.json

@@ -42,6 +42,7 @@
     "@wordpress/data": "^10.10.0",
     "@wordpress/dom-ready": "^4.37.0",
     "@wordpress/element": "6.38.0",
+    "@wordpress/hooks": "4.41.0",
     "@wordpress/i18n": "^6.10.0",
     "@wordpress/icons": "11.5.0",
     "@wordpress/interactivity": "6.37.0",

src/blocks/carousel/__tests__/templates.test.ts

@@ -0,0 +1,124 @@
+/**
+ * Unit tests for slide template definitions and the template registry.
+ *
+ * Verifies:
+ * - All default templates have the required shape
+ * - Template inner blocks produce valid BlockInstance arrays
+ * - Query Loop template is flagged correctly
+ * - The `rtcamp.carouselKit.slideTemplates` filter hook is applied
+ *
+ * @package
+ */
+
+import { getSlideTemplates } from '../templates';
+
+/* ── Mocks ────────────────────────────────────────────────────────────────── */
+
+// Provide a minimal createBlock mock that returns a plain object.
+jest.mock( '@wordpress/blocks', () => ( {
+	createBlock: jest.fn( ( name: string, attrs = {}, inner = [] ) => ( {
+		name,
+		attributes: attrs,
+		innerBlocks: inner,
+		clientId: `mock-${ name }-${ Math.random().toString( 36 ).slice( 2, 8 ) }`,
+	} ) ),
+} ) );
+
+jest.mock( '@wordpress/hooks', () => ( {
+	applyFilters: jest.fn( ( _hookName: string, value: unknown ) => value ),
+} ) );
+
+jest.mock( '@wordpress/i18n', () => ( {
+	__: jest.fn( ( str: string ) => str ),
+} ) );
+
+/* ── Tests ────────────────────────────────────────────────────────────────── */
+
+describe( 'Slide Templates', () => {
+	describe( 'getSlideTemplates()', () => {
+		it( 'returns an array of templates', () => {
+			const templates = getSlideTemplates();
+			expect( Array.isArray( templates ) ).toBe( true );
+			expect( templates.length ).toBeGreaterThanOrEqual( 5 );
+		} );
+
+		it( 'applies the rtcamp.carouselKit.slideTemplates filter', () => {
+			const { applyFilters } = require( '@wordpress/hooks' );
+			getSlideTemplates();
+			expect( applyFilters ).toHaveBeenCalledWith(
+				'rtcamp.carouselKit.slideTemplates',
+				expect.any( Array ),
+			);
+		} );
+	} );
+
+	describe( 'Template Shape', () => {
+		const templates = getSlideTemplates();
+
+		it.each( templates.map( ( t ) => [ t.name, t ] ) )(
+			'template "%s" has required properties',
+			( _name, template ) => {
+				expect( typeof template.name ).toBe( 'string' );
+				expect( template.name.length ).toBeGreaterThan( 0 );
+				expect( typeof template.label ).toBe( 'string' );
+				expect( typeof template.description ).toBe( 'string' );
+				expect( typeof template.icon ).toBe( 'object' );
+				expect( typeof template.innerBlocks ).toBe( 'function' );
+			},
+		);
+
+		it( 'each template has a unique name', () => {
+			const names = templates.map( ( t ) => t.name );
+			expect( new Set( names ).size ).toBe( names.length );
+		} );
+	} );
+
+	describe( 'Default Templates', () => {
+		const templates = getSlideTemplates();
+		const byName = ( name: string ) =>
+			templates.find( ( t ) => t.name === name )!;
+
+		it( 'blank template produces a paragraph block', () => {
+			const blocks = byName( 'blank' ).innerBlocks();
+			expect( blocks ).toHaveLength( 1 );
+			expect( blocks[ 0 ].name ).toBe( 'core/paragraph' );
+		} );
+
+		it( 'image template produces an image block', () => {
+			const blocks = byName( 'image' ).innerBlocks();
+			expect( blocks ).toHaveLength( 1 );
+			expect( blocks[ 0 ].name ).toBe( 'core/image' );
+		} );
+
+		it( 'hero template produces a cover with heading, paragraph, and button', () => {
+			const blocks = byName( 'hero' ).innerBlocks();
+			expect( blocks ).toHaveLength( 1 );
+			expect( blocks[ 0 ].name ).toBe( 'core/cover' );
+			const inner = blocks[ 0 ].innerBlocks;
+			expect( inner ).toHaveLength( 3 );
+			expect( inner[ 0 ].name ).toBe( 'core/heading' );
+			expect( inner[ 1 ].name ).toBe( 'core/paragraph' );
+			expect( inner[ 2 ].name ).toBe( 'core/buttons' );
+		} );
+
+		it( 'image-caption template produces an image and a paragraph', () => {
+			const blocks = byName( 'image-caption' ).innerBlocks();
+			expect( blocks ).toHaveLength( 2 );
+			expect( blocks[ 0 ].name ).toBe( 'core/image' );
+			expect( blocks[ 1 ].name ).toBe( 'core/paragraph' );
+		} );
+
+		it( 'query-loop template is flagged as isQueryLoop', () => {
+			const ql = byName( 'query-loop' );
+			expect( ql.isQueryLoop ).toBe( true );
+		} );
+
+		it( 'non-query-loop templates are not flagged as isQueryLoop', () => {
+			templates
+				.filter( ( t ) => t.name !== 'query-loop' )
+				.forEach( ( t ) => {
+					expect( t.isQueryLoop ).toBeFalsy();
+				} );
+		} );
+	} );
+} );

src/blocks/carousel/components/TemplatePicker.tsx

@@ -0,0 +1,53 @@
+/**
+ * TemplatePicker — grid of slide template options shown during block setup.
+ *
+ * @package
+ */
+
+import { __ } from '@wordpress/i18n';
+import { Button, Icon } from '@wordpress/components';
+import type { SlideTemplate } from '../templates';
+
+interface TemplatePickerProps {
+	templates: SlideTemplate[];
+	onSelect: ( template: SlideTemplate ) => void;
+	onBack: () => void;
+}
+
+export default function TemplatePicker( {
+	templates,
+	onSelect,
+	onBack,
+}: TemplatePickerProps ) {
+	return (
+		<div className="carousel-kit-template-picker">
+			<div className="carousel-kit-template-picker__grid">
+				{ templates.map( ( template ) => (
+					<button
+						key={ template.name }
+						type="button"
+						className="carousel-kit-template-picker__item"
+						onClick={ () => onSelect( template ) }
+					>
+						<div className="carousel-kit-template-picker__icon">
+							<Icon icon={ template.icon } size={ 28 } />
+						</div>
+						<div className="carousel-kit-template-picker__label">
+							{ template.label }
+						</div>
+						<div className="carousel-kit-template-picker__description">
+							{ template.description }
+						</div>
+					</button>
+				) ) }
+			</div>
+			<Button
+				variant="link"
+				className="carousel-kit-template-picker__back"
+				onClick={ onBack }
+			>
+				{ __( 'Back', 'carousel-kit' ) }
+			</Button>
+		</div>
+	);
+}

src/blocks/carousel/edit.tsx

@@ -25,6 +25,10 @@ import { createBlock, type BlockConfiguration } from '@wordpress/blocks';
 import type { CarouselAttributes } from './types';
 import { EditorCarouselContext } from './editor-context';
 import type { EmblaCarouselType } from 'embla-carousel';
+import { getSlideTemplates, type SlideTemplate } from './templates';
+import TemplatePicker from './components/TemplatePicker';
+
+type SetupStep = 'slide-count' | 'template';
 
 export default function Edit( {
 	attributes,
@@ -55,6 +59,8 @@ export default function Edit( {
 	const [ emblaApi, setEmblaApi ] = useState<EmblaCarouselType | undefined>();
 	const [ canScrollPrev, setCanScrollPrev ] = useState( false );
 	const [ canScrollNext, setCanScrollNext ] = useState( false );
+	const [ setupStep, setSetupStep ] = useState<SetupStep>( 'slide-count' );
+	const [ pendingSlideCount, setPendingSlideCount ] = useState<number>( 0 );
 
 	const { replaceInnerBlocks, insertBlock } = useDispatch( 'core/block-editor' );
 
@@ -155,16 +161,35 @@ export default function Edit( {
 			],
 		);
 
-	const handleSetup = ( slideCount: number ) => {
-		const slides = Array.from( { length: slideCount }, () =>
-			createBlock( 'carousel-kit/carousel-slide', {}, [
-				createBlock( 'core/paragraph', {} ),
-			] ),
-		);
+	/**
+	 * Handle the initial setup of the carousel block
+	 *
+	 * @param {number} count - The number of slides selected by the user.
+	 */
+	const handleSlideCountPicked = ( count: number ) => {
+		setPendingSlideCount( count );
+		setSetupStep( 'template' );
+	};
+
+	/**
+	 * Handle the selection of a slide template during setup.
+	 *
+	 * @param {SlideTemplate} template - The slide template selected by the user.
+	 */
+	const handleTemplateSelected = ( template: SlideTemplate ) => {
+		// Query Loop goes directly inside the viewport; regular templates get slide wrappers.
+		const viewportChildren = template.isQueryLoop
+			? [ createBlock( 'core/query', {}, [] ) ]
+			: Array.from( { length: Math.max( pendingSlideCount, 1 ) }, () =>
+				createBlock( 'carousel-kit/carousel-slide', {}, template.innerBlocks() ),
+			);
 
 		replaceInnerBlocks(
 			clientId,
-			[ createBlock( 'carousel-kit/carousel-viewport', {}, slides ), createNavGroup() ],
+			[
+				createBlock( 'carousel-kit/carousel-viewport', {}, viewportChildren ),
+				createNavGroup(),
+			],
 			false,
 		);
 	};
@@ -393,30 +418,45 @@ export default function Edit( {
 					<Placeholder
 						icon="columns"
 						label={ __( 'Carousel', 'carousel-kit' ) }
-						instructions={ __( 'How many slides would you like to start with?', 'carousel-kit' ) }
+						instructions={
+							setupStep === 'slide-count'
+								? __( 'How many slides would you like to start with?', 'carousel-kit' )
+								: __( 'Choose a slide template:', 'carousel-kit' )
+						}
 						className="carousel-kit-setup"
 					>
-						<div className="carousel-kit-setup__options">
-							{ [ 1, 2, 3, 4 ].map( ( count ) => (
+						{ setupStep === 'slide-count' && (
+							<>
+								<div className="carousel-kit-setup__options">
+									{ [ 1, 2, 3, 4 ].map( ( count ) => (
+										<Button
+											key={ count }
+											variant="secondary"
+											className="carousel-kit-setup__option"
+											onClick={ () => handleSlideCountPicked( count ) }
+										>
+											{ count === 1
+												? __( '1 Slide', 'carousel-kit' )
+												: `${ count } ${ __( 'Slides', 'carousel-kit' ) }` }
+										</Button>
+									) ) }
+								</div>
 								<Button
-									key={ count }
-									variant="secondary"
-									className="carousel-kit-setup__option"
-									onClick={ () => handleSetup( count ) }
+									variant="link"
+									className="carousel-kit-setup__skip"
+									onClick={ handleSkip }
 								>
-									{ count === 1
-										? __( '1 Slide', 'carousel-kit' )
-										: `${ count } ${ __( 'Slides', 'carousel-kit' ) }` }
+									{ __( 'Skip', 'carousel-kit' ) }
 								</Button>
-							) ) }
-						</div>
-						<Button
-							variant="link"
-							className="carousel-kit-setup__skip"
-							onClick={ handleSkip }
-						>
-							{ __( 'Skip', 'carousel-kit' ) }
-						</Button>
+							</>
+						) }
+						{ setupStep === 'template' && (
+							<TemplatePicker
+								templates={ getSlideTemplates() }
+								onSelect={ handleTemplateSelected }
+								onBack={ () => setSetupStep( 'slide-count' ) }
+							/>
+						) }
 					</Placeholder>
 				</div>
 			</EditorCarouselContext.Provider>