Create a Book block

.editorconfig

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+# This file is for unifying the coding style for different editors and IDEs
+# editorconfig.org
+
+# WordPress Coding Standards
+# https://make.wordpress.org/core/handbook/coding-standards/
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+
+[*.yml]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.{gradle,java,kt}]
+indent_style = space
+
+[packages/react-native-*/**.xml]
+indent_style = space

.wp-env.json

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+{
+	"core": "WordPress/WordPress#master",
+	"plugins": [ "." ]
+}

blocks/book/editor.scss

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+/**
+ * The following styles get applied inside the editor only.
+ *
+ * Replace them with your own styles or remove the file completely.
+ */
+
+// This selector should be revisited if/when we can leverage lightBlockWrapper.
+.wp-block-a8c-book {
+	.wp-block-a8c-book__cover {
+		// Ensure the correct aspect ratio of the cover image, even when the source image is way too big.
+		height: 100% !important; // Needs high specificity to override an inline style. Would be nice if this could be output by the component itself instead.
+
+		// Make the placeholder look like a book.
+		.components-placeholder {
+			box-shadow: none;
+			height: 100%;
+		}
+	}
+
+	.wp-block-a8c-book__cover-placeholder {
+		// Default to 33% width.
+		min-width: 140px;
+		min-height: 230px;
+		width: 33% !important;
+		padding-top: 50%;
+
+		.components-placeholder {
+			position: absolute;
+			top: 0;
+			right: 0;
+			bottom: 0;
+			left: 0;
+		}
+
+		// Hide the resize handles on the placeholder.
+		.components-resizable-box__handle {
+			display: none;
+		}
+	}
+}
+
+.wp-block[data-align='center'] > .wp-block-a8c-book {
+	display: flex;
+	flex-direction: column;
+	align-items: center;
+}
+.wp-block[data-align='left'] > .wp-block-a8c-book {
+	margin-right: 1em;
+}
+
+.wp-block[data-align='right'] > .wp-block-a8c-book {
+	margin-left: 1em;
+}
+
+.wp-block[data-align='left'],
+.wp-block[data-align='right'] {
+	> .wp-block-a8c-book {
+		margin-top: 0;
+		margin-bottom: 0;
+	}
+}

blocks/book/index.php

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+<?php
+
+add_action( 'init', function() {
+	register_block_type( 'a8c/book', [
+		'editor_script' => 'wpcom-blocks',
+		'style' => 'wpcom-blocks',
+		'editor_style' => 'wpcom-blocks-editor',
+	] );
+} );

blocks/book/src/edit.js

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+import {
+	BlockControls,
+	MediaPlaceholder,
+	MediaUpload,
+	RichText,
+	__experimentalBlock as Block,
+} from '@wordpress/block-editor';
+import { Button, ResizableBox, Toolbar } from '@wordpress/components';
+/**
+ * Retrieves the translation of text.
+ *
+ * @see https://developer.wordpress.org/block-editor/packages/packages-i18n/
+ */
+import { __ } from '@wordpress/i18n';
+import { isEmpty } from 'lodash';
+
+import classnames from 'classnames';
+import prefixClasses from './prefixClasses';
+
+/**
+ * The edit function describes the structure of your block in the context of the
+ * editor. This represents what the editor will render when the block is used.
+ *
+ * @see https://developer.wordpress.org/block-editor/developers/block-api/block-edit-save/#edit
+ *
+ * @param {Object} [props]           Properties passed from the editor.
+ * @param {string} [props.className] Class name generated for the block.
+ *
+ * @return {WPElement} Element to render.
+ */
+
+export default function Edit( {
+	className,
+	isSelected,
+	setAttributes,
+	attributes,
+} ) {
+	const {
+		author,
+		align,
+		height,
+		imageId,
+		imageUrl,
+		publicationDate,
+		publisher,
+		title,
+		width,
+	} = attributes;
+	const hasMedia = !! imageId;
+
+	const handleResize = ( event, direction, elt, delta ) =>
+		setAttributes( {
+			height: parseInt( height + delta.height, 10 ),
+			width: parseInt( width + delta.width, 10 ),
+		} );
+
+	const handleSelectCoverImage = ( media ) =>
+		setAttributes( { imageId: media.id, imageUrl: media.url } );
+
+	const handleImageLoad = ( event ) => {
+		const { currentTarget } = event;
+		const { naturalHeight, naturalWidth } = currentTarget;
+
+		setAttributes( { height: naturalHeight, width: naturalWidth } );
+	};
+
+	const classes = classnames( 'wp-block-a8c-book', className );
+
+	/**
+	 * Function that creates an event handler for the RichText element,
+	 *  which will update the given `attribute`.
+	 *
+	 * @param {String} attribute
+	 */
+	const updateAttribute = ( attribute ) => ( value ) =>
+		setAttributes( { [ attribute ]: value } );
+
+	const enabledHandles = {
+		top: false,
+		right: align === 'left' || ! align || align === 'center',
+		left: align === 'right' || align === 'center',
+		bottom: true,
+		topRight: false,
+		bottomRight: false,
+		bottomLeft: false,
+		topLeft: false,
+	};
+
+	const resizableBoxClasses = classnames( prefixClasses( '__cover' ), {
+		[ `${ prefixClasses( '__cover-placeholder' ) }` ]: ! hasMedia,
+	} );
+
+	const shouldDisplayField = ( field ) =>
+		! RichText.isEmpty( field ) || isSelected;
+	const shouldDisplayMetadata =
+		title || author || publisher || publicationDate || isSelected;
+
+	return (
+		<Block.div className={ classes }>
+			{ hasMedia && (
+				<BlockControls>
+					<Toolbar>
+						<MediaUpload
+							onSelect={ handleSelectCoverImage }
+							allowedTypes={ [ 'image' ] }
+							value={ imageId }
+							render={ ( { open } ) => (
+								<Button
+									className="components-toolbar__control"
+									onClick={ open }
+								>
+									{ __( 'Replace' ) }
+								</Button>
+							) }
+						/>
+					</Toolbar>
+				</BlockControls>
+			) }
+			<ResizableBox
+				enable={ enabledHandles }
+				className={ resizableBoxClasses }
+				size={ {
+					height,
+					width,
+				} }
+				defaultSize={ { width: '100%' } }
+				maxWidth="100%"
+				onResizeStop={ handleResize }
+				showHandle={ isSelected }
+				lockAspectRatio
+			>
+				{ hasMedia ? (
+					<img
+						src={ imageUrl }
+						alt={ title }
+						onLoad={ handleImageLoad }
+					/>
+				) : (
+					<MediaPlaceholder
+						allowedTypes={ [ 'image' ] }
+						onSelect={ handleSelectCoverImage }
+						labels={ {
+							title: __( 'Book cover image' ),
+							instructions: __(
+								"Upload the book's cover image."
+							),
+						} }
+						value={ { id: imageId } }
+					/>
+				) }
+			</ResizableBox>
+
+			{ shouldDisplayMetadata && (
+				<section
+					className={ prefixClasses( '__meta' ) }
+					style={ { width } }
+				>
+					{ shouldDisplayField( title ) && (
+						<RichText
+							keepPlaceholderOnFocus
+							name="title"
+							tagName="p"
+							value={ title }
+							placeholder="Book title"
+							className={ prefixClasses( '__title' ) }
+							onChange={ updateAttribute( 'title' ) }
+						/>
+					) }
+					{ shouldDisplayField( author ) && (
+						<RichText
+							keepPlaceholderOnFocus
+							name="author"
+							tagName="p"
+							value={ author }
+							placeholder="Author name"
+							onChange={ updateAttribute( 'author' ) }
+						/>
+					) }
+					<p className={ prefixClasses( '__publication' ) }>
+						{ shouldDisplayField( publisher ) && (
+							<RichText
+								keepPlaceholderOnFocus
+								name="publisher"
+								tagName="span"
+								value={ publisher }
+								placeholder="Publisher"
+								onChange={ updateAttribute( 'publisher' ) }
+							/>
+						) }
+						{ shouldDisplayField( publicationDate ) && (
+							<RichText
+								keepPlaceholderOnFocus
+								name="publicationDate"
+								tagName="span"
+								value={ publicationDate }
+								placeholder="Publication date"
+								onChange={ updateAttribute(
+									'publicationDate'
+								) }
+							/>
+						) }
+					</p>
+				</section>
+			) }
+		</Block.div>
+	);
+}

blocks/book/src/icon.js

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+/**
+ * WordPress depedencies
+ */
+
+import { Path, SVG } from '@wordpress/components';
+
+export const BookIcon = () => (
+	<SVG xmlns="http://www.w3.org/2000/svg"
+		width="24" height="24"
+		viewBox="0 0 24 24"
+	>
+		<Path d="M5 5v14c0 1.1.9 2 2 2h10V3H7c-1.1 0-2 .9-2 2zm7 2.5l2 2.5V4.5h1.5v15H7c-.3 0-.5-.2-.5-.5V5c0-.3.2-.5.5-.5h3V10l2-2.5zM18.5 3v18H20V3h-1.5z" />
+	</SVG>
+);