Block Support: Update border support to allow non-pixel units

lib/block-supports/border.php

@@ -56,8 +56,14 @@ function gutenberg_apply_border_support( $block_type, $block_attributes ) {
 		gutenberg_has_border_feature_support( $block_type, 'radius' ) &&
 		isset( $block_attributes['style']['border']['radius'] )
 	) {
-		$border_radius = (int) $block_attributes['style']['border']['radius'];
-		$styles[]      = sprintf( 'border-radius: %dpx;', $border_radius );
+		$border_radius = $block_attributes['style']['border']['radius'];
+
+		// This check handles original unitless implementation.
+		if ( is_numeric( $border_radius ) ) {
+			$border_radius .= 'px';
+		}
+
+		$styles[] = sprintf( 'border-radius: %s;', $border_radius );
 	}
 
 	// Border style.
@@ -74,8 +80,14 @@ function gutenberg_apply_border_support( $block_type, $block_attributes ) {
 		gutenberg_has_border_feature_support( $block_type, 'width' ) &&
 		isset( $block_attributes['style']['border']['width'] )
 	) {
-		$border_width = intval( $block_attributes['style']['border']['width'] );
-		$styles[]     = sprintf( 'border-width: %dpx;', $border_width );
+		$border_width = $block_attributes['style']['border']['width'];
+
+		// This check handles original unitless implementation.
+		if ( is_numeric( $border_width ) ) {
+			$border_width .= 'px';
+		}
+
+		$styles[] = sprintf( 'border-width: %s;', $border_width );
 	}
 
 	// Border color.

packages/block-editor/src/hooks/border-radius.js

@@ -1,16 +1,17 @@
 /**
  * WordPress dependencies
  */
-import { RangeControl } from '@wordpress/components';
+import { __experimentalUnitControl as UnitControl } from '@wordpress/components';
+import { useState } from '@wordpress/element';
 import { __ } from '@wordpress/i18n';
 
 /**
  * Internal dependencies
  */
+import { CSS_UNITS, parseUnit } from './border';
 import { cleanEmptyObject } from './utils';
 
 const MIN_BORDER_RADIUS_VALUE = 0;
-const MAX_BORDER_RADIUS_VALUE = 50;
 
 /**
  * Inspector control panel containing the border radius related configuration.
@@ -24,6 +25,15 @@ export function BorderRadiusEdit( props ) {
 		setAttributes,
 	} = props;
 
+	// Step value is maintained in state so step is appropriate for current unit
+	// even when current radius value is undefined.
+	const initialStep = parseUnit( style?.border?.radius ) === 'px' ? 1 : 0.25;
+	const [ step, setStep ] = useState( initialStep );
+
+	const onUnitChange = ( newUnit ) => {
+		setStep( newUnit === 'px' ? 1 : 0.25 );
+	};
+
 	const onChange = ( newRadius ) => {
 		let newStyle = {
 			...style,
@@ -33,22 +43,22 @@ export function BorderRadiusEdit( props ) {
 			},
 		};
 
-		if ( newRadius === undefined ) {
+		if ( newRadius === undefined || newRadius === '' ) {
 			newStyle = cleanEmptyObject( newStyle );
 		}
 
 		setAttributes( { style: newStyle } );
 	};
 
 	return (
-		<RangeControl
+		<UnitControl
 			value={ style?.border?.radius }
 			label={ __( 'Border radius' ) }
 			min={ MIN_BORDER_RADIUS_VALUE }
-			max={ MAX_BORDER_RADIUS_VALUE }
-			initialPosition={ 0 }
-			allowReset
 			onChange={ onChange }
+			onUnitChange={ onUnitChange }
+			step={ step }
+			units={ CSS_UNITS }
 		/>
 	);
 }

packages/block-editor/src/hooks/border-width.js

@@ -1,16 +1,17 @@
 /**
  * WordPress dependencies
  */
-import { RangeControl } from '@wordpress/components';
+import { __experimentalUnitControl as UnitControl } from '@wordpress/components';
+import { useState } from '@wordpress/element';
 import { __ } from '@wordpress/i18n';
 
 /**
  * Internal dependencies
  */
+import { CSS_UNITS, parseUnit } from './border';
 import { cleanEmptyObject } from './utils';
 
 const MIN_BORDER_WIDTH = 0;
-const MAX_BORDER_WIDTH = 50;
 
 /**
  * Inspector control for configuring border width property.
@@ -24,27 +25,40 @@ export const BorderWidthEdit = ( props ) => {
 		setAttributes,
 	} = props;
 
+	// Step value is maintained in state so step is appropriate for current unit
+	// even when current radius value is undefined.
+	const initialStep = parseUnit( style?.border?.width ) === 'px' ? 1 : 0.25;
+	const [ step, setStep ] = useState( initialStep );
+
+	const onUnitChange = ( newUnit ) => {
+		setStep( newUnit === 'px' ? 1 : 0.25 );
+	};
+
 	const onChange = ( newWidth ) => {
-		const newStyle = {
+		let newStyle = {
 			...style,
 			border: {
 				...style?.border,
 				width: newWidth,
 			},
 		};
 
-		setAttributes( { style: cleanEmptyObject( newStyle ) } );
+		if ( newWidth === undefined || newWidth === '' ) {
+			newStyle = cleanEmptyObject( newStyle );
+		}
+
+		setAttributes( { style: newStyle } );
 	};
 
 	return (
-		<RangeControl
+		<UnitControl
 			value={ style?.border?.width }
 			label={ __( 'Border width' ) }
 			min={ MIN_BORDER_WIDTH }
-			max={ MAX_BORDER_WIDTH }
-			initialPosition={ 0 }
-			allowReset
 			onChange={ onChange }
+			onUnitChange={ onUnitChange }
+			step={ step }
+			units={ CSS_UNITS }
 		/>
 	);
 };

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

@@ -16,7 +16,44 @@ import { BorderRadiusEdit } from './border-radius';
 import { BorderStyleEdit } from './border-style';
 import { BorderWidthEdit } from './border-width';
 
+const isWeb = Platform.OS === 'web';
+
 export const BORDER_SUPPORT_KEY = '__experimentalBorder';
+export const CSS_UNITS = [
+	{
+		value: 'px',
+		label: isWeb ? 'px' : __( 'Pixels (px)' ),
+		default: '',
+		a11yLabel: __( 'Pixels (px)' ),
+	},
+	{
+		value: 'em',
+		label: isWeb ? 'em' : __( 'Relative to parent font size (em)' ),
+		default: '',
+		a11yLabel: __( 'Relative to parent font size (em)' ),
+	},
+	{
+		value: 'rem',
+		label: isWeb ? 'rem' : __( 'Relative to root font size (rem)' ),
+		default: '',
+		a11yLabel: __( 'Relative to root font size (rem)' ),
+	},
+];
+
+/**
+ * Parses a CSS unit from a border CSS value.
+ *
+ * @param  {string} cssValue CSS value to parse e.g. `10px` or `1.5em`.
+ * @return {string}          CSS unit from provided value or default 'px'.
+ */
+export function parseUnit( cssValue ) {
+	const value = String( cssValue ).trim();
+	const unitMatch = value.match( /[\d.\-\+]*\s*(.*)/ )[ 1 ];
+	const unit = unitMatch !== undefined ? unitMatch.toLowerCase() : '';
+	const currentUnit = CSS_UNITS.find( ( item ) => item.value === unit );
+
+	return currentUnit?.value || 'px';
+}
 
 export function BorderPanel( props ) {
 	const isDisabled = useIsBorderDisabled( props );
@@ -44,7 +81,11 @@ export function BorderPanel( props ) {
 
 	return (
 		<InspectorControls>
-			<PanelBody title={ __( 'Border settings' ) } initialOpen={ false }>
+			<PanelBody
+				className="block-editor-hooks__border-controls"
+				title={ __( 'Border settings' ) }
+				initialOpen={ false }
+			>
 				{ isStyleSupported && <BorderStyleEdit { ...props } /> }
 				{ isWidthSupported && <BorderWidthEdit { ...props } /> }
 				{ isRadiusSupported && <BorderRadiusEdit { ...props } /> }

packages/block-editor/src/hooks/border.scss

@@ -0,0 +1,10 @@
+.block-editor-hooks__border-controls {
+	.components-unit-control-wrapper {
+		margin-bottom: $grid-unit-30;
+
+		&:last-child {
+			margin-bottom: $grid-unit-10;
+		}
+	}
+}
+

packages/block-editor/src/hooks/test/style.js

@@ -18,8 +18,8 @@ describe( 'getInlineStyles', () => {
 				color: { text: 'red', background: 'black' },
 				typography: { lineHeight: 1.5, fontSize: 10 },
 				border: {
-					radius: 10,
-					width: 3,
+					radius: '10px',
+					width: '1em',
 					style: 'dotted',
 					color: '#21759b',
 				},
@@ -31,9 +31,9 @@ describe( 'getInlineStyles', () => {
 		).toEqual( {
 			backgroundColor: 'black',
 			borderColor: '#21759b',
-			borderRadius: 10,
+			borderRadius: '10px',
 			borderStyle: 'dotted',
-			borderWidth: 3,
+			borderWidth: '1em',
 			color: 'red',
 			lineHeight: 1.5,
 			fontSize: 10,

packages/block-editor/src/style.scss

@@ -58,6 +58,7 @@
 @import "./components/warning/style.scss";
 @import "./hooks/anchor.scss";
 @import "./hooks/layout.scss";
+@import "./hooks/border.scss";
 
 // This tag marks the end of the styles that apply to editing canvas contents and need to be manipulated when we resize the editor.
 #end-resizable-editor-section {

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

@@ -225,9 +225,7 @@ function ButtonEdit( props ) {
 						}
 					) }
 					style={ {
-						borderRadius: borderRadius
-							? borderRadius + 'px'
-							: undefined,
+						borderRadius: borderRadius ? borderRadius : undefined,
 						...colorProps.style,
 					} }
 					onSplit={ ( value ) =>

packages/block-library/src/button/save.js

@@ -38,7 +38,7 @@ export default function save( { attributes, className } ) {
 		}
 	);
 	const buttonStyle = {
-		borderRadius: borderRadius ? borderRadius + 'px' : undefined,
+		borderRadius: borderRadius ? borderRadius : undefined,
 		...colorProps.style,
 	};
 

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

@@ -50,7 +50,7 @@ import {
 
 // Used to calculate border radius adjustment to avoid "fat" corners when
 // button is placed inside wrapper.
-const DEFAULT_INNER_PADDING = 4;
+const DEFAULT_INNER_PADDING = '4px';
 
 export default function SearchEdit( {
 	className,
@@ -323,10 +323,16 @@ export default function SearchEdit( {
 		if ( 'button-inside' === buttonPosition && style?.border?.radius ) {
 			// We have button inside wrapper and a border radius value to apply.
 			// Add default padding so we don't get "fat" corners.
-			const outerRadius =
-				parseInt( style?.border?.radius, 10 ) + DEFAULT_INNER_PADDING;
+			//
+			// CSS calc() is used here to support non-pixel units. The inline
+			// style using calc() will only apply if both values have units.
+			const radius = Number.isInteger( borderRadius )
+				? `${ borderRadius }px`
+				: borderRadius;
 
-			return { borderRadius: `${ outerRadius }px` };
+			return {
+				borderRadius: `calc(${ radius } + ${ DEFAULT_INNER_PADDING })`,
+			};
 		}
 
 		return undefined;

packages/block-library/src/search/index.php

@@ -190,7 +190,8 @@ function styles_for_block_core_search( $attributes ) {
 	if ( $has_border_radius ) {
 		// Shared style for button and input radius values.
 		$border_radius   = $attributes['style']['border']['radius'];
-		$shared_styles[] = sprintf( 'border-radius: %spx;', esc_attr( $border_radius ) );
+		$border_radius   = is_numeric( $border_radius ) ? $border_radius . 'px' : $border_radius;
+		$shared_styles[] = sprintf( 'border-radius: %s;', esc_attr( $border_radius ) );
 
 		// Apply wrapper border radius if button placed inside.
 		$button_inside = ! empty( $attributes['buttonPosition'] ) &&
@@ -199,10 +200,13 @@ function styles_for_block_core_search( $attributes ) {
 		if ( $button_inside ) {
 			// We adjust the border radius value for the outer wrapper element
 			// to make it visually consistent with the radius applied to inner
-			// elements.
-			$default_padding  = 4;
-			$adjusted_radius  = $border_radius + $default_padding;
-			$wrapper_styles[] = sprintf( 'border-radius: %dpx;', esc_attr( $adjusted_radius ) );
+			// elements. calc() is used to support non-pixel CSS units.
+			$default_padding  = '4px';
+			$wrapper_styles[] = sprintf(
+				'border-radius: calc(%s + %s);',
+				esc_attr( $border_radius ),
+				esc_attr( $default_padding )
+			);
 		}
 	}