Fix: Align Hook: Impossible to set no alignment when a default align exists

docs/block-api.md

@@ -412,6 +412,19 @@ align: true,
 // Pick which alignment options to display.
 align: [ 'left', 'right', 'full' ],
 ```
+When supports align is used the block attributes definition is extended to include an align attribute with a string type.
+By default, no alignment is assigned to the block. 
+The block can apply a default alignment by specifying its own align attribute with a default e.g.:
+```
+attributes: {
+	...
+	align: {
+		type: 'string',
+		default: 'right'
+	},
+	...
+}
+```
 
 - `alignWide` (default `true`): This property allows to enable [wide alignment](../docs/extensibility/theme-support.md#wide-alignment) for your theme. To disable this behavior for a single block, set this flag to `false`.
 

packages/editor/src/hooks/align.js

@@ -2,14 +2,14 @@
  * External dependencies
  */
 import classnames from 'classnames';
-import { assign, get, includes } from 'lodash';
+import { assign, get, has, includes } from 'lodash';
 
 /**
  * WordPress dependencies
  */
 import { createHigherOrderComponent } from '@wordpress/compose';
 import { addFilter } from '@wordpress/hooks';
-import { hasBlockSupport, getBlockSupport } from '@wordpress/blocks';
+import { hasBlockSupport, getBlockSupport, getBlockType } from '@wordpress/blocks';
 
 /**
  * Internal dependencies
@@ -24,7 +24,7 @@ import { BlockControls, BlockAlignmentToolbar } from '../components';
  */
 export function addAttribute( settings ) {
 	// allow blocks to specify their own attribute definition with default values if needed.
-	if ( get( settings.attributes, [ 'align', 'type' ] ) === 'string' ) {
+	if ( has( settings.attributes, [ 'align', 'type' ] ) ) {
 		return settings;
 	}
 	if ( hasBlockSupport( settings, 'align' ) ) {
@@ -77,7 +77,16 @@ export const withToolbarControls = createHigherOrderComponent( ( BlockEdit ) =>
 	return ( props ) => {
 		const validAlignments = getBlockValidAlignments( props.name );
 
-		const updateAlignment = ( nextAlign ) => props.setAttributes( { align: nextAlign } );
+		const updateAlignment = ( nextAlign ) => {
+			if ( ! nextAlign ) {
+				const blockType = getBlockType( props.name );
+				const blockDefaultAlign = get( blockType, [ 'attributes', 'align', 'default' ] );
+				if ( blockDefaultAlign ) {
+					nextAlign = '';
+				}
+			}
+			props.setAttributes( { align: nextAlign } );
+		};
 
 		return [
 			validAlignments.length > 0 && props.isSelected && (

test/e2e/specs/__snapshots__/align-hook.test.js.snap

@@ -0,0 +1,43 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Align Hook Works As Expected Block with align array Correctly applies the selected alignment and correctly removes the alignment 1`] = `
+"<!-- wp:test/test-align-array {\\"align\\":\\"center\\"} -->
+<div style=\\"outline:1px solid gray;padding:5px\\" class=\\"wp-block-test-test-align-array aligncenter\\">Test Align Hook</div>
+<!-- /wp:test/test-align-array -->"
+`;
+
+exports[`Align Hook Works As Expected Block with align array Correctly applies the selected alignment and correctly removes the alignment 2`] = `
+"<!-- wp:test/test-align-array -->
+<div style=\\"outline:1px solid gray;padding:5px\\" class=\\"wp-block-test-test-align-array\\">Test Align Hook</div>
+<!-- /wp:test/test-align-array -->"
+`;
+
+exports[`Align Hook Works As Expected Block with align true Correctly applies the selected alignment and correctly removes the alignment 1`] = `
+"<!-- wp:test/test-align-true {\\"align\\":\\"right\\"} -->
+<div style=\\"outline:1px solid gray;padding:5px\\" class=\\"wp-block-test-test-align-true alignright\\">Test Align Hook</div>
+<!-- /wp:test/test-align-true -->"
+`;
+
+exports[`Align Hook Works As Expected Block with align true Correctly applies the selected alignment and correctly removes the alignment 2`] = `
+"<!-- wp:test/test-align-true -->
+<div style=\\"outline:1px solid gray;padding:5px\\" class=\\"wp-block-test-test-align-true\\">Test Align Hook</div>
+<!-- /wp:test/test-align-true -->"
+`;
+
+exports[`Align Hook Works As Expected Block with default align Correctly applies the selected alignment and correctly removes the alignment 1`] = `
+"<!-- wp:test/test-default-align {\\"align\\":\\"center\\"} -->
+<div style=\\"outline:1px solid gray;padding:5px\\" class=\\"wp-block-test-test-default-align aligncenter\\">Test Align Hook</div>
+<!-- /wp:test/test-default-align -->"
+`;
+
+exports[`Align Hook Works As Expected Block with default align Correctly applies the selected alignment and correctly removes the alignment 2`] = `
+"<!-- wp:test/test-default-align {\\"align\\":\\"\\"} -->
+<div style=\\"outline:1px solid gray;padding:5px\\" class=\\"wp-block-test-test-default-align\\">Test Align Hook</div>
+<!-- /wp:test/test-default-align -->"
+`;
+
+exports[`Align Hook Works As Expected Block with no alignment set Does not save any alignment related attribute or class 1`] = `
+"<!-- wp:test/test-no-alignment-set -->
+<div style=\\"outline:1px solid gray;padding:5px\\" class=\\"wp-block-test-test-no-alignment-set\\">Test Align Hook</div>
+<!-- /wp:test/test-no-alignment-set -->"
+`;

test/e2e/specs/align-hook.test.js

@@ -0,0 +1,196 @@
+/**
+ * Internal dependencies
+ */
+import {
+	newPost,
+	insertBlock,
+	getEditedPostContent,
+	setPostContent,
+	getAllBlocks,
+	selectBlockByClientId,
+} from '../support/utils';
+import { activatePlugin, deactivatePlugin } from '../support/plugins';
+
+describe( 'Align Hook Works As Expected', () => {
+	beforeAll( async () => {
+		await activatePlugin( 'gutenberg-test-align-hook' );
+	} );
+
+	beforeEach( async () => {
+		await newPost();
+	} );
+
+	afterAll( async () => {
+		await deactivatePlugin( 'gutenberg-test-align-hook' );
+	} );
+
+	const getAlignmentToolbarLabels = async () => {
+		const buttonLabels = await page.evaluate( () => {
+			return Array.from(
+				document.querySelectorAll(
+					'.editor-block-toolbar button[aria-label^="Align"]'
+				)
+			).map(
+				( button ) => {
+					return button.getAttribute( 'aria-label' );
+				}
+			);
+		} );
+		return buttonLabels;
+	};
+
+	const createShowsTheExpectedButtonsTest = ( blockName, buttonLabels ) => {
+		it( 'Shows the expected buttons on the alignment toolbar',
+			async () => {
+				await insertBlock( blockName );
+				expect(
+					await getAlignmentToolbarLabels()
+				).toEqual( buttonLabels );
+			} );
+	};
+
+	const createDoesNotApplyAlignmentByDefaultTest = ( blockName ) => {
+		it( 'Does not apply any alignment by default', async () => {
+			await insertBlock( blockName );
+			// verify no alignment button is in pressed state
+			const pressedButtons = await page.$$( '.editor-block-toolbar button[aria-label^="Align"][aria-pressed="true"]' );
+			expect( pressedButtons ).toHaveLength( 0 );
+		} );
+	};
+
+	const verifyMarkupIsValid = async ( htmlMarkup ) => {
+		await setPostContent( htmlMarkup );
+		const blocks = await getAllBlocks();
+		expect( blocks ).toHaveLength( 1 );
+		expect( blocks[ 0 ].isValid ).toBeTruthy();
+	};
+
+	const createCorrectlyAppliesAndRemovesAlignmentTest = ( blockName, alignment ) => {
+		it( 'Correctly applies the selected alignment and correctly removes the alignment',
+			async () => {
+				const BUTTON_SELECTOR = `.editor-block-toolbar button[aria-label="Align ${ alignment }"]`;
+				const BUTTON_PRESSED_SELECTOR = `${ BUTTON_SELECTOR }[aria-pressed="true"]`;
+				// set the specified alignment.
+				await insertBlock( blockName );
+				await page.click( BUTTON_SELECTOR );
+
+				// verify the button of the specified alignment is pressed.
+				let pressedButtons = await page.$$( BUTTON_PRESSED_SELECTOR );
+				expect( pressedButtons ).toHaveLength( 1 );
+
+				let htmlMarkup = await getEditedPostContent();
+
+				// verify the markup of the selected alignment was generated.
+				expect( htmlMarkup ).toMatchSnapshot();
+
+				// verify the markup can be correctly parsed
+				await verifyMarkupIsValid( htmlMarkup );
+
+				await selectBlockByClientId(
+					( await getAllBlocks() )[ 0 ].clientId
+				);
+
+				// remove the alignment.
+				await page.click( BUTTON_SELECTOR );
+
+				// verify no alignment button is in pressed state.
+				pressedButtons = await page.$$( BUTTON_PRESSED_SELECTOR );
+				expect( pressedButtons ).toHaveLength( 0 );
+
+				// verify alignment markup was removed from the block.
+				htmlMarkup = await getEditedPostContent();
+				expect( htmlMarkup ).toMatchSnapshot();
+
+				// verify the markup when no alignment is set is valid
+				await verifyMarkupIsValid( htmlMarkup );
+
+				await selectBlockByClientId(
+					( await getAllBlocks() )[ 0 ].clientId
+				);
+
+				// verify no alignment button is in pressed state after parsing the block.
+				pressedButtons = await page.$$( BUTTON_PRESSED_SELECTOR );
+				expect( pressedButtons ).toHaveLength( 0 );
+			}
+		);
+	};
+
+	describe( 'Block with no alignment set', () => {
+		const BLOCK_NAME = 'Test No Alignment Set';
+		it( 'Shows no alignment buttons on the alignment toolbar',
+			async () => {
+				expect( await getAlignmentToolbarLabels() ).toHaveLength( 0 );
+			}
+		);
+
+		it( 'Does not save any alignment related attribute or class',
+			async () => {
+				await insertBlock( BLOCK_NAME );
+				expect( await getEditedPostContent() ).toMatchSnapshot();
+			}
+		);
+	} );
+
+	describe( 'Block with align true', () => {
+		const BLOCK_NAME = 'Test Align True';
+
+		createShowsTheExpectedButtonsTest( BLOCK_NAME, [
+			'Align left',
+			'Align center',
+			'Align right',
+		] );
+
+		createDoesNotApplyAlignmentByDefaultTest( BLOCK_NAME );
+
+		createCorrectlyAppliesAndRemovesAlignmentTest( BLOCK_NAME, 'right' );
+	} );
+
+	describe( 'Block with align array', () => {
+		const BLOCK_NAME = 'Test Align Array';
+
+		createShowsTheExpectedButtonsTest( BLOCK_NAME, [
+			'Align left',
+			'Align center',
+		] );
+
+		createDoesNotApplyAlignmentByDefaultTest( BLOCK_NAME );
+
+		createCorrectlyAppliesAndRemovesAlignmentTest( BLOCK_NAME, 'center' );
+	} );
+
+	describe( 'Block with default align', () => {
+		const BLOCK_NAME = 'Test Default Align';
+		const PRESSED_BUTTON_SELECTOR = '.editor-block-toolbar button[aria-label="Align right"][aria-pressed="true"]';
+		createShowsTheExpectedButtonsTest( BLOCK_NAME, [
+			'Align left',
+			'Align center',
+			'Align right',
+		] );
+
+		it( 'Applies the selected alignment by default', async () => {
+			await insertBlock( BLOCK_NAME );
+			// verify the correct alignment button is pressed
+			const pressedButtons = await page.$$( PRESSED_BUTTON_SELECTOR );
+			expect( pressedButtons ).toHaveLength( 1 );
+		} );
+
+		it( 'The default markup does not contain the alignment attribute but contains the alignment class',
+			async () => {
+				await insertBlock( BLOCK_NAME );
+				const markup = await getEditedPostContent();
+				expect( markup ).not.toContain( '"align":"right"' );
+				expect( markup ).toContain( 'alignright' );
+			}
+		);
+
+		it( 'Can remove the default alignment and the align attribute equals none but alignnone class is not applied', async () => {
+			await insertBlock( BLOCK_NAME );
+			// remove the alignment.
+			await page.click( PRESSED_BUTTON_SELECTOR );
+			const markup = await getEditedPostContent();
+			expect( markup ).toContain( '"align":""' );
+		} );
+
+		createCorrectlyAppliesAndRemovesAlignmentTest( BLOCK_NAME, 'center' );
+	} );
+} );

test/e2e/support/utils.js

@@ -411,3 +411,29 @@ export async function clickOnCloseModalButton( modalClassName ) {
 		await page.click( closeButtonClassName );
 	}
 }
+
+/**
+ * Sets code editor content
+ * @param {string} content New code editor content.
+ *
+ * @return {Promise} Promise resolving with an array containing all blocks in the document.
+ */
+export async function setPostContent( content ) {
+	return await page.evaluate( ( _content ) => {
+		const { dispatch } = window.wp.data;
+		const blocks = wp.blocks.parse( _content );
+		dispatch( 'core/editor' ).resetBlocks( blocks );
+	}, content );
+}
+
+/**
+ * Returns an array with all blocks; Equivalent to calling wp.data.select( 'core/editor' ).getBlocks();
+ *
+ * @return {Promise} Promise resolving with an array containing all blocks in the document.
+ */
+export async function getAllBlocks() {
+	return await page.evaluate( () => {
+		const { select } = window.wp.data;
+		return select( 'core/editor' ).getBlocks();
+	} );
+}

test/e2e/test-plugins/align-hook.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Plugin Name: Gutenberg Test Align Hook
+ * Plugin URI: https://github.com/WordPress/gutenberg
+ * Author: Gutenberg Team
+ *
+ * @package gutenberg-test-align-hook
+ */
+wp_enqueue_script(
+	'gutenberg-test-align-hook',
+	plugins_url( 'align-hook/index.js', __FILE__ ),
+	array(
+		'wp-blocks',
+		'wp-element',
+		'wp-editor',
+		'wp-i18n'
+	),
+	filemtime( plugin_dir_path( __FILE__ ) . 'align-hook/index.js' ),
+	true
+);