Add Gallery Block

blocks/library/gallery/gallery-image.js

@@ -0,0 +1,8 @@
+
+export default function GalleryImage( props ) {
+	return (
+		<figure key={ props.i } className="blocks-gallery-image">
+			<img src={ props.img.url } alt={ props.img.alt } />
+		</figure>
+	);
+}

blocks/library/gallery/index.js

@@ -0,0 +1,142 @@
+/**
+ * Internal dependencies
+ */
+import './style.scss';
+import { registerBlockType, query as hpq } from '../../api';
+
+import Placeholder from 'components/placeholder';
+import MediaUploadButton from '../../media-upload-button';
+
+import GalleryImage from './gallery-image';
+
+const { query, attr } = hpq;
+
+const editMediaLibrary = ( attributes, setAttributes ) => {
+	const frameConfig = {
+		frame: 'post',
+		title: wp.i18n.__( 'Update Gallery media' ),
+		button: {
+			text: wp.i18n.__( 'Select' ),
+		},
+		multiple: true,
+		state: 'gallery-edit',
+		selection: new wp.media.model.Selection( attributes.images, { multiple: true } ),
+	};
+
+	const editFrame = wp.media( frameConfig );
+	function updateFn() {
+		setAttributes( {
+			images: this.frame.state().attributes.library.models.map( ( a ) => {
+				return a.attributes;
+			} ),
+		} );
+	}
+
+	editFrame.on( 'insert', updateFn );
+	editFrame.state( 'gallery-edit' ).on( 'update', updateFn );
+	editFrame.open( 'gutenberg-gallery' );
+};
+
+/**
+ * Returns an attribute setter with behavior that if the target value is
+ * already the assigned attribute value, it will be set to undefined.
+ *
+ * @param  {string}   align Alignment value
+ * @return {Function}       Attribute setter
+ */
+function toggleAlignment( align ) {
+	return ( attributes, setAttributes ) => {
+		const nextAlign = attributes.align === align ? undefined : align;
+		setAttributes( { align: nextAlign } );
+	};
+}
+
+registerBlockType( 'core/gallery', {
+	title: wp.i18n.__( 'Gallery' ),
+	icon: 'format-gallery',
+	category: 'common',
+
+	attributes: {
+		images:
+			query( 'div.blocks-gallery figure.blocks-gallery-image img', {
+				url: attr( 'src' ),
+				alt: attr( 'alt' ),
+			} ),
+	},
+
+	controls: [
+		{
+			icon: 'format-image',
+			title: wp.i18n.__( 'Edit Gallery' ),
+			onClick: editMediaLibrary,
+		},
+		{
+			icon: 'align-left',
+			title: wp.i18n.__( 'Align left' ),
+			isActive: ( { align } ) => 'left' === align,
+			onClick: toggleAlignment( 'left' ),
+		},
+		{
+			icon: 'align-center',
+			title: wp.i18n.__( 'Align center' ),
+			isActive: ( { align } ) => ! align || 'center' === align,
+			onClick: toggleAlignment( 'center' ),
+		},
+		{
+			icon: 'align-right',
+			title: wp.i18n.__( 'Align right' ),
+			isActive: ( { align } ) => 'right' === align,
+			onClick: toggleAlignment( 'right' ),
+		},
+		{
+			icon: 'align-full-width',
+			title: wp.i18n.__( 'Wide width' ),
+			isActive: ( { align } ) => 'wide' === align,
+			onClick: toggleAlignment( 'wide' ),
+		},
+	],
+
+	edit( { attributes, setAttributes } ) {
+		const { images, align = 'none' } = attributes;
+		if ( ! images ) {
+			const setMediaUrl = ( imgs ) => setAttributes( { images: imgs } );
+			return (
+				<Placeholder
+					instructions={ wp.i18n.__( 'Drag images here or insert from media library' ) }
+					icon="format-gallery"
+					label={ wp.i18n.__( 'Gallery' ) }
+					className="blocks-gallery">
+					<MediaUploadButton
+						onSelect={ setMediaUrl }
+						type="image"
+						auto-open
+						multiple="true"
+					>
+						{ wp.i18n.__( 'Insert from Media Library' ) }
+					</MediaUploadButton>
+				</Placeholder>
+			);
+		}
+
+		return (
+			<div className={ `blocks-gallery align${ align }` }>
+				{ images.map( ( img, i ) => (
+					<GalleryImage key={ i } img={ img } />
+				) ) }
+			</div>
+		);
+	},
+
+	save( { attributes } ) {
+		const { images, align = 'none' } = attributes;
+
+		return (
+			<div className={ `blocks-gallery align${ align }` } >
+				{ images.map( ( img, i ) => (
+					<GalleryImage key={ i } img={ img } />
+				) ) }
+			</div>
+		);
+	},
+
+} );

blocks/library/gallery/style.scss

@@ -0,0 +1,37 @@
+
+.blocks-gallery {
+
+	display: flex;
+	flex-wrap: wrap;
+
+	.blocks-gallery-image {
+
+		margin: 8px;
+
+		img {
+			max-width: 120px;
+		}
+	}
+}
+
+.blocks-gallery.is-placeholder {
+	margin: -15px;
+	padding: 6em 0;
+	border: 2px solid $light-gray-500;
+	text-align: center;
+}
+
+.blocks-gallery__placeholder-label {
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	font-weight: bold;
+
+	.dashicon {
+		margin-right: 1ch;
+	}
+}
+
+.blocks-gallery__placeholder-instructions {
+	margin: 1.8em 0;
+}

blocks/library/index.js

@@ -11,4 +11,5 @@ import './pullquote';
 import './table';
 import './preformatted';
 import './code';
+import './gallery';
 import './latest-posts';

blocks/test/fixtures/core-gallery.html

@@ -0,0 +1,10 @@
+<!-- wp:core/gallery -->
+<div class="blocks-gallery">
+	<figure class="blocks-gallery-image">
+		<img src="https://cldup.com/uuUqE_dXzy.jpg" alt="title" />
+	</figure>
+	<figure class="blocks-gallery-image">
+		<img src="https://cldup.com/uuUqE_dXzy.jpg" alt="title" />
+	</figure>
+</div>
+<!-- /wp:core/gallery -->

blocks/test/fixtures/core-gallery.json

@@ -0,0 +1,12 @@
+[
+    {
+        "uid": "_uid_0",
+        "name": "core/gallery",
+        "attributes": {
+            "images": [
+                { "url": "https://cldup.com/uuUqE_dXzy.jpg", "alt": "title" },
+                { "url": "https://cldup.com/uuUqE_dXzy.jpg", "alt": "title" }
+            ]
+        }
+    }
+]

blocks/test/fixtures/core-gallery.serialized.html

@@ -0,0 +1,7 @@
+<!-- wp:core/gallery -->
+<div class="blocks-gallery alignnone">
+    <figure class="blocks-gallery-image"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt="title" /></figure>
+    <figure class="blocks-gallery-image"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt="title" /></figure>
+</div>
+<!-- /wp:core/gallery -->
+

blocks/test/full-content.js

@@ -53,7 +53,10 @@ function normalizeReactTree( element ) {
 		return element.map( child => normalizeReactTree( child ) );
 	}
 
-	if ( isObject( element ) ) {
+	// Check if we got an object first, then if it actually has a `type` like a
+	// React component.  Sometimes we get other stuff here, which probably
+	// indicates a bug.
+	if ( isObject( element ) && element.type ) {
 		const toReturn = {
 			type: element.type,
 		};