Introduce a support key for support global style colors in blocks

packages/block-editor/src/components/block-list/block-wrapper.js

@@ -199,7 +199,11 @@ const BlockComponent = forwardRef(
 				{ ...props }
 				id={ blockElementId }
 				ref={ wrapper }
-				className={ classnames( className, props.className ) }
+				className={ classnames(
+					className,
+					props.className,
+					wrapperProps && wrapperProps.className
+				) }
 				data-block={ clientId }
 				data-type={ name }
 				data-title={ blockTitle }
@@ -209,6 +213,7 @@ const BlockComponent = forwardRef(
 				onMouseLeave={ isSelected ? onMouseLeave : undefined }
 				tabIndex="0"
 				style={ {
+					...( wrapperProps ? wrapperProps.style : {} ),
 					...( props.style || {} ),
 					...animationStyle,
 				} }

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

@@ -88,7 +88,7 @@ function BlockListBlock( {
 		isDraggingBlocks && ( isSelected || isPartOfMultiSelection );
 
 	// Determine whether the block has props to apply to the wrapper.
-	if ( ! lightBlockWrapper && blockType.getEditWrapperProps ) {
+	if ( blockType.getEditWrapperProps ) {
 		wrapperProps = {
 			...wrapperProps,
 			...blockType.getEditWrapperProps( attributes ),

packages/block-editor/src/hooks/color.js

@@ -0,0 +1,249 @@
+/**
+ * External dependencies
+ */
+import classnames from 'classnames';
+
+/**
+ * WordPress dependencies
+ */
+import { addFilter } from '@wordpress/hooks';
+import { hasBlockSupport } from '@wordpress/blocks';
+import { createHigherOrderComponent } from '@wordpress/compose';
+import { __ } from '@wordpress/i18n';
+import { useState, useEffect } from '@wordpress/element';
+import { useSelect } from '@wordpress/data';
+
+/**
+ * Internal dependencies
+ */
+import {
+	getColorClassName,
+	getColorObjectByColorValue,
+	getColorObjectByAttributeValues,
+} from '../components/colors';
+import PanelColorSettings from '../components/panel-color-settings';
+import ContrastChecker from '../components/contrast-checker';
+import InspectorControls from '../components/inspector-controls';
+import { getBlockDOMNode } from '../utils/dom';
+
+export const COLOR_SUPPORT_KEY = '__experimentalColor';
+
+/**
+ * Filters registered block settings, extending attributes to include
+ * `backgroundColor` and `textColor` attribute.
+ *
+ * @param  {Object} settings Original block settings
+ * @return {Object}          Filtered block settings
+ */
+function addAttributes( settings ) {
+	if ( ! hasBlockSupport( settings, COLOR_SUPPORT_KEY ) ) {
+		return settings;
+	}
+
+	// allow blocks to specify their own attribute definition with default values if needed.
+	if ( ! settings.attributes.backgroundColor ) {
+		Object.assign( settings.attributes, {
+			backgroundColor: {
+				type: 'string',
+			},
+		} );
+	}
+	if ( ! settings.attributes.textColor ) {
+		Object.assign( settings.attributes, {
+			textColor: {
+				type: 'string',
+			},
+		} );
+	}
+
+	return settings;
+}
+
+/**
+ * Override props assigned to save component to inject colors classnames.
+ *
+ * @param  {Object} props      Additional props applied to save element
+ * @param  {Object} blockType  Block type
+ * @param  {Object} attributes Block attributes
+ * @return {Object}            Filtered props applied to save element
+ */
+export function addSaveProps( props, blockType, attributes ) {
+	if ( ! hasBlockSupport( blockType, COLOR_SUPPORT_KEY ) ) {
+		return props;
+	}
+
+	// I'd have prefered to avoid the "style" attribute usage here
+	const { backgroundColor, textColor, style } = attributes;
+
+	const backgroundClass = getColorClassName(
+		'background-color',
+		backgroundColor
+	);
+	const textClass = getColorClassName( 'color', textColor );
+	props.className = classnames( props.className, backgroundClass, textClass, {
+		'has-text-color': textColor || style?.color?.text,
+		'has-background': backgroundColor || style?.color?.background,
+	} );
+
+	return props;
+}
+
+/**
+ * Filters registered block settings to extand the block edit wrapper
+ * to apply the desired styles and classnames properly.
+ *
+ * @param  {Object} settings Original block settings
+ * @return {Object}          Filtered block settings
+ */
+export function addEditProps( settings ) {
+	if ( ! hasBlockSupport( settings, COLOR_SUPPORT_KEY ) ) {
+		return settings;
+	}
+	const existingGetEditWrapperProps = settings.getEditWrapperProps;
+	settings.getEditWrapperProps = ( attributes ) => {
+		let props = {};
+		if ( existingGetEditWrapperProps ) {
+			props = existingGetEditWrapperProps( attributes );
+		}
+		return addSaveProps( props, settings, attributes );
+	};
+
+	return settings;
+}
+
+const ColorPanel = ( { colorSettings, clientId } ) => {
+	const { getComputedStyle, Node } = window;
+
+	const [ detectedBackgroundColor, setDetectedBackgroundColor ] = useState();
+	const [ detectedColor, setDetectedColor ] = useState();
+
+	useEffect( () => {
+		const colorsDetectionElement = getBlockDOMNode( clientId );
+		setDetectedColor( getComputedStyle( colorsDetectionElement ).color );
+
+		let backgroundColorNode = colorsDetectionElement;
+		let backgroundColor = getComputedStyle( backgroundColorNode )
+			.backgroundColor;
+		while (
+			backgroundColor === 'rgba(0, 0, 0, 0)' &&
+			backgroundColorNode.parentNode &&
+			backgroundColorNode.parentNode.nodeType === Node.ELEMENT_NODE
+		) {
+			backgroundColorNode = backgroundColorNode.parentNode;
+			backgroundColor = getComputedStyle( backgroundColorNode )
+				.backgroundColor;
+		}
+
+		setDetectedBackgroundColor( backgroundColor );
+	} );
+
+	return (
+		<InspectorControls>
+			<PanelColorSettings
+				title={ __( 'Color settings' ) }
+				initialOpen={ false }
+				colorSettings={ colorSettings }
+			>
+				<ContrastChecker
+					backgroundColor={ detectedBackgroundColor }
+					textColor={ detectedColor }
+				/>
+			</PanelColorSettings>
+		</InspectorControls>
+	);
+};
+
+/**
+ * Override the default edit UI to include new inspector controls for block
+ * color, if block defines support.
+ *
+ * @param  {Function} BlockEdit Original component
+ * @return {Function}           Wrapped component
+ */
+export const withBlockControls = createHigherOrderComponent(
+	( BlockEdit ) => ( props ) => {
+		const { name: blockName } = props;
+		const colors = useSelect( ( select ) => {
+			return select( 'core/block-editor' ).getSettings().colors;
+		}, [] );
+
+		if ( ! hasBlockSupport( blockName, COLOR_SUPPORT_KEY ) ) {
+			return <BlockEdit key="edit" { ...props } />;
+		}
+		const { style, textColor, backgroundColor } = props.attributes;
+
+		const onChangeColor = ( name ) => ( value ) => {
+			const colorObject = getColorObjectByColorValue( colors, value );
+			const attributeName = name + 'Color';
+			const newStyle = {
+				...style,
+				color: {
+					...style?.color,
+					[ name ]: colorObject?.slug ? undefined : value,
+				},
+			};
+			const newNamedColor = colorObject?.slug
+				? colorObject.slug
+				: undefined;
+			props.setAttributes( {
+				style: newStyle,
+				[ attributeName ]: newNamedColor,
+			} );
+		};
+
+		return [
+			<ColorPanel
+				key="colors"
+				clientId={ props.clientId }
+				colorSettings={ [
+					{
+						label: __( 'Text Color' ),
+						onChange: onChangeColor( 'text' ),
+						colors,
+						value: getColorObjectByAttributeValues(
+							colors,
+							textColor,
+							style?.color?.text
+						).color,
+					},
+					{
+						label: __( 'Background Color' ),
+						onChange: onChangeColor( 'background' ),
+						colors,
+						value: getColorObjectByAttributeValues(
+							colors,
+							backgroundColor,
+							style?.color?.background
+						).color,
+					},
+				] }
+			/>,
+			<BlockEdit key="edit" { ...props } />,
+		];
+	},
+	'withToolbarControls'
+);
+
+addFilter(
+	'blocks.registerBlockType',
+	'core/color/addAttribute',
+	addAttributes
+);
+
+addFilter(
+	'blocks.getSaveContent.extraProps',
+	'core/color/addSaveProps',
+	addSaveProps
+);
+
+addFilter(
+	'blocks.registerBlockType',
+	'core/color/addEditProps',
+	addEditProps
+);
+
+addFilter(
+	'editor.BlockEdit',
+	'core/color/with-block-controls',
+	withBlockControls
+);

packages/block-editor/src/hooks/index.js

@@ -5,5 +5,7 @@ import { AlignmentHookSettingsProvider } from './align';
 import './anchor';
 import './custom-class-name';
 import './generated-class-name';
+import './style';
+import './color';
 
 export { AlignmentHookSettingsProvider };