[Mobile] Refactor gallery as nested image blocks

lib/experiments-page.php

@@ -58,7 +58,7 @@ function gutenberg_initialize_experiments_settings() {
 		'gutenberg-experiments',
 		'gutenberg_experiments_section',
 		array(
-			'label' => __( 'Test a new gallery block that uses nested image blocks', 'gutenberg' ),
+			'label' => __( 'Test a new gallery block that uses nested image blocks (Warning: The new gallery is not compatible with WordPress mobile apps prior to version 18.1. If you use the mobile app, please update to the latest version to avoid content loss.)', 'gutenberg' ),
 			'id'    => 'gutenberg-gallery-refactor',
 		)
 	);

packages/block-editor/src/components/block-list/block-list-item.native.js

@@ -16,6 +16,8 @@ import { ReadableContentView, alignmentHelpers } from '@wordpress/components';
  */
 import BlockListBlock from './block';
 import BlockInsertionPoint from './insertion-point';
+import Grid from './grid-item';
+
 import styles from './block-list-item.native.scss';
 import { store as blockEditorStore } from '../../store';
 
@@ -104,7 +106,7 @@ export class BlockListItem extends Component {
 		];
 	}
 
-	render() {
+	renderContent() {
 		const {
 			blockAlignment,
 			clientId,
@@ -123,10 +125,6 @@ export class BlockListItem extends Component {
 			contentResizeMode === 'stretch' && stretchStyle;
 		const { isContainerRelated } = alignmentHelpers;
 
-		if ( ! blockWidth ) {
-			return null;
-		}
-
 		return (
 			<ReadableContentView
 				align={ blockAlignment }
@@ -162,6 +160,34 @@ export class BlockListItem extends Component {
 			</ReadableContentView>
 		);
 	}
+
+	render() {
+		const {
+			gridProperties,
+			clientId,
+			parentWidth,
+			items,
+			blockWidth,
+		} = this.props;
+
+		if ( ! blockWidth ) {
+			return null;
+		}
+
+		if ( gridProperties ) {
+			return (
+				<Grid
+					numOfColumns={ gridProperties.numColumns }
+					tileCount={ items.length }
+					index={ items.indexOf( clientId ) }
+					maxWidth={ parentWidth }
+				>
+					{ this.renderContent() }
+				</Grid>
+			);
+		}
+		return this.renderContent();
+	}
 }
 
 export default compose( [

packages/block-editor/src/components/block-list/block-list-item.native.scss

@@ -10,3 +10,7 @@
 .fullAlignmentPadding {
 	padding: $block-edge-to-content;
 }
+
+.gridItem {
+	overflow: visible;
+}

packages/block-editor/src/components/block-list/grid-item.native.js

@@ -0,0 +1,58 @@
+/**
+ * External dependencies
+ */
+import { View } from 'react-native';
+
+/**
+ * Internal dependencies
+ */
+import styles from './block-list-item.scss';
+
+function Grid( props ) {
+	/**
+	 * Since we don't have `calc()`, we must calculate our spacings here in
+	 * order to preserve even spacing between tiles and equal width for tiles
+	 * in a given row.
+	 *
+	 * In order to ensure equal sizing of tile contents, we distribute the
+	 * spacing such that each tile has an equal "share" of the fixed spacing. To
+	 * keep the tiles properly aligned within their rows, we calculate the left
+	 * and right paddings based on the tile's relative position within the row.
+	 *
+	 * Note: we use padding instead of margins so that the fixed spacing is
+	 * included within the relative spacing (i.e. width percentage), and
+	 * wrapping behavior is preserved.
+	 *
+	 * - The left most tile in a row must have left padding of zero.
+	 * - The right most tile in a row must have a right padding of zero.
+	 *
+	 * The values of these left and right paddings are interpolated for tiles in
+	 * between. The right padding is complementary with the left padding of the
+	 * next tile (i.e. the right padding of [tile n] + the left padding of
+	 * [tile n + 1] will be equal for all tiles except the last one in a given
+	 * row).
+	 *
+	 */
+	const { numOfColumns, children, tileCount, index, maxWidth } = props;
+	const lastTile = tileCount - 1;
+	const lastRow = Math.floor( lastTile / numOfColumns );
+
+	const row = Math.floor( index / numOfColumns );
+	const rowLength =
+		row === lastRow ? ( lastTile % numOfColumns ) + 1 : numOfColumns;
+
+	return (
+		<View
+			style={ [
+				{
+					width: maxWidth / rowLength,
+				},
+				styles.gridItem,
+			] }
+		>
+			{ children }
+		</View>
+	);
+}
+
+export default Grid;

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

@@ -47,6 +47,7 @@ const getStyles = (
 	const computedStyles = [
 		isStackedHorizontally && styles.horizontal,
 		horizontalAlignment && styles[ `is-aligned-${ horizontalAlignment }` ],
+		styles.overflowVisible,
 	];
 	stylesMemo[ styleName ] = computedStyles;
 	return computedStyles;
@@ -128,6 +129,7 @@ export class BlockList extends Component {
 			onDeleteBlock,
 			contentStyle,
 			renderAppender,
+			gridProperties,
 		} = this.props;
 		const { blockWidth } = this.state;
 		if (
@@ -136,7 +138,8 @@ export class BlockList extends Component {
 			this.extraData.onDeleteBlock !== onDeleteBlock ||
 			this.extraData.contentStyle !== contentStyle ||
 			this.extraData.renderAppender !== renderAppender ||
-			this.extraData.blockWidth !== blockWidth
+			this.extraData.blockWidth !== blockWidth ||
+			this.extraData.gridProperties !== gridProperties
 		) {
 			this.extraData = {
 				parentWidth,
@@ -145,6 +148,7 @@ export class BlockList extends Component {
 				contentStyle,
 				renderAppender,
 				blockWidth,
+				gridProperties,
 			};
 		}
 		return this.extraData;
@@ -312,9 +316,11 @@ export class BlockList extends Component {
 			onDeleteBlock,
 			rootClientId,
 			isStackedHorizontally,
+			blockClientIds,
 			parentWidth,
 			marginVertical = styles.defaultBlock.marginTop,
 			marginHorizontal = styles.defaultBlock.marginLeft,
+			gridProperties,
 		} = this.props;
 		const { blockWidth } = this.state;
 		return (
@@ -333,6 +339,8 @@ export class BlockList extends Component {
 					this.shouldShowInnerBlockAppender
 				}
 				blockWidth={ blockWidth }
+				gridProperties={ gridProperties }
+				items={ blockClientIds }
 			/>
 		);
 	}

packages/block-editor/src/components/block-styles/preview.native.js

@@ -71,7 +71,7 @@ function StylePreview( { onPress, isActive, style, url } ) {
 			return (
 				<Animated.View
 					style={ [ outlineStyle, { opacity }, styles[ name ] ] }
-					key={ outlineStyle.borderColor }
+					key={ JSON.stringify( outlineStyle ) }
 				/>
 			);
 		} );

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

@@ -18,7 +18,10 @@ export * from './colors';
 export * from './gradients';
 export * from './font-sizes';
 export { AlignmentControl, AlignmentToolbar } from './alignment-control';
-export { default as InnerBlocks } from './inner-blocks';
+export {
+	default as InnerBlocks,
+	useInnerBlocksProps as __experimentalUseInnerBlocksProps,
+} from './inner-blocks';
 export { default as InspectorAdvancedControls } from './inspector-advanced-controls';
 export { default as InspectorControls } from './inspector-controls';
 export {

packages/block-editor/src/components/inner-blocks/index.native.js

@@ -3,6 +3,7 @@
  */
 import { useSelect } from '@wordpress/data';
 import { getBlockType, withBlockContentContext } from '@wordpress/blocks';
+import { useRef } from '@wordpress/element';
 
 /**
  * Internal dependencies
@@ -23,6 +24,44 @@ import { BlockContextProvider } from '../block-context';
 import { defaultLayout, LayoutProvider } from '../block-list/layout';
 import { store as blockEditorStore } from '../../store';
 
+/**
+ * This hook is used to lightly mark an element as an inner blocks wrapper
+ * element. Call this hook and pass the returned props to the element to mark as
+ * an inner blocks wrapper, automatically rendering inner blocks as children. If
+ * you define a ref for the element, it is important to pass the ref to this
+ * hook, which the hook in turn will pass to the component through the props it
+ * returns. Optionally, you can also pass any other props through this hook, and
+ * they will be merged and returned.
+ *
+ * @param {Object} props   Optional. Props to pass to the element. Must contain
+ *                         the ref if one is defined.
+ * @param {Object} options Optional. Inner blocks options.
+ *
+ * @see https://github.com/WordPress/gutenberg/blob/master/packages/block-editor/src/components/inner-blocks/README.md
+ */
+export function useInnerBlocksProps( props = {}, options = {} ) {
+	const fallbackRef = useRef();
+	const { clientId } = useBlockEditContext();
+
+	const ref = props.ref || fallbackRef;
+	const InnerBlocks =
+		options.value && options.onChange
+			? ControlledInnerBlocks
+			: UncontrolledInnerBlocks;
+
+	return {
+		...props,
+		ref,
+		children: (
+			<InnerBlocks
+				{ ...options }
+				clientId={ clientId }
+				wrapperRef={ ref }
+			/>
+		),
+	};
+}
+
 /**
  * InnerBlocks is a component which allows a single block to have multiple blocks
  * as children. The UncontrolledInnerBlocks component is used whenever the inner
@@ -53,6 +92,7 @@ function UncontrolledInnerBlocks( props ) {
 		filterInnerBlocks,
 		blockWidth,
 		__experimentalLayout: layout = defaultLayout,
+		gridProperties,
 	} = props;
 
 	const block = useSelect(
@@ -86,6 +126,7 @@ function UncontrolledInnerBlocks( props ) {
 			onAddBlock={ onAddBlock }
 			onDeleteBlock={ onDeleteBlock }
 			filterInnerBlocks={ filterInnerBlocks }
+			gridProperties={ gridProperties }
 			blockWidth={ blockWidth }
 		/>
 	);

packages/block-editor/src/components/media-placeholder/index.native.js

@@ -38,6 +38,7 @@ function MediaPlaceholder( props ) {
 		labels = {},
 		icon,
 		onSelect,
+		onFocus,
 		__experimentalOnlyMediaLibrary,
 		isAppender,
 		disableMediaButtons,
@@ -175,7 +176,7 @@ function MediaPlaceholder( props ) {
 							accessibilityRole={ 'button' }
 							accessibilityHint={ accessibilityHint }
 							onPress={ ( event ) => {
-								props.onFocus( event );
+								onFocus?.( event );
 								open();
 							} }
 						>

packages/block-editor/src/store/defaults.native.js

@@ -8,6 +8,9 @@ import {
 
 const SETTINGS_DEFAULTS = {
 	...SETTINGS,
+	// FOR TESTING ONLY - Later, this will come from a REST API
+	// eslint-disable-next-line no-undef
+	__unstableGalleryWithImageBlocks: __DEV__,
 	alignWide: true,
 };
 

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

@@ -61,17 +61,13 @@ const linkOptions = [
 ];
 const ALLOWED_MEDIA_TYPES = [ 'image' ];
 
-const PLACEHOLDER_TEXT = Platform.select( {
-	web: __(
-		'Drag images, upload new ones or select files from your library.'
-	),
-	native: __( 'ADD MEDIA' ),
-} );
-
-const MOBILE_CONTROL_PROPS_RANGE_CONTROL = Platform.select( {
-	web: {},
-	native: { type: 'stepper' },
-} );
+const PLACEHOLDER_TEXT = Platform.isNative
+	? __( 'ADD MEDIA' )
+	: __( 'Drag images, upload new ones or select files from your library.' );
+
+const MOBILE_CONTROL_PROPS_RANGE_CONTROL = Platform.isNative
+	? { type: 'stepper' }
+	: {};
 
 function GalleryEdit( props ) {
 	const {
@@ -491,7 +487,7 @@ function GalleryEdit( props ) {
 							hideCancelButton={ true }
 						/>
 					) }
-					{ ! imageSizeOptions && (
+					{ Platform.isWeb && ! imageSizeOptions && (
 						<BaseControl className={ 'gallery-image-sizes' }>
 							<BaseControl.VisualLabel>
 								{ __( 'Image size' ) }

packages/block-library/src/gallery/gallery-styles.native.scss

@@ -1,5 +1,7 @@
-.galleryTilesContainerSelected {
-	margin-bottom: 16px;
+@import "./v1/gallery-styles.native.scss";
+
+.galleryAppender {
+	padding-top: $grid-unit-20;
 }
 
 .fullWidth {