Fluid typography: add configurable settings for minimum font size to theme.json

docs/reference-guides/theme-json-reference/theme-json-living.md

@@ -119,7 +119,7 @@ Settings related to typography.
 | customFontSize | boolean | true |  |
 | fontStyle | boolean | true |  |
 | fontWeight | boolean | true |  |
-| fluid | boolean |  |  |
+| fluid | undefined | false |  |
 | letterSpacing | boolean | true |  |
 | lineHeight | boolean | false |  |
 | textDecoration | boolean | true |  |

lib/block-supports/typography.php

@@ -451,18 +451,25 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 
 	// Checks if fluid font sizes are activated.
 	$typography_settings         = gutenberg_get_global_settings( array( 'typography' ) );
-	$should_use_fluid_typography = isset( $typography_settings['fluid'] ) && true === $typography_settings['fluid'] ? true : $should_use_fluid_typography;
+	$should_use_fluid_typography
+		= isset( $typography_settings['fluid'] ) &&
+		( true === $typography_settings['fluid'] || is_array( $typography_settings['fluid'] ) ) ?
+		true :
+		$should_use_fluid_typography;
 
 	if ( ! $should_use_fluid_typography ) {
 		return $preset['size'];
 	}
 
+	$fluid_settings = isset( $typography_settings['fluid'] ) && is_array( $typography_settings['fluid'] ) ? $typography_settings['fluid'] : array();
+
 	// Defaults.
 	$default_maximum_viewport_width   = '1600px';
 	$default_minimum_viewport_width   = '768px';
 	$default_minimum_font_size_factor = 0.75;
 	$default_scale_factor             = 1;
-	$default_minimum_font_size_limit  = '14px';
+	$has_min_font_size                = isset( $fluid_settings['minFontSize'] ) && ! empty( gutenberg_get_typography_value_and_unit( $fluid_settings['minFontSize'] ) );
+	$default_minimum_font_size_limit  = $has_min_font_size ? $fluid_settings['minFontSize'] : '14px';
 
 	// Font sizes.
 	$fluid_font_size_settings = isset( $preset['fluid'] ) ? $preset['fluid'] : null;

packages/block-editor/CHANGELOG.md

@@ -9,6 +9,7 @@
 ### Enhancements
 
 -   `URLInput`: the `renderSuggestions` callback prop now receives `currentInputValue` as a new parameter ([45806](https://github.com/WordPress/gutenberg/pull/45806)).
+-   Fluid typography: add configurable fluid typography settings for minimum font size to theme.json ([#42489](https://github.com/WordPress/gutenberg/pull/42489)).
 
 ### Bug Fix
 

packages/block-editor/README.md

@@ -428,6 +428,7 @@ _Parameters_
 -   _args.minimumFontSize_ `?string`: Minimum font size for any clamp() calculation. Optional.
 -   _args.scaleFactor_ `?number`: A scale factor to determine how fast a font scales within boundaries. Optional.
 -   _args.minimumFontSizeFactor_ `?number`: How much to scale defaultFontSize by to derive minimumFontSize. Optional.
+-   _args.minimumFontSizeLimit_ `?string`: The smallest a calculated font size may be. Optional.
 
 _Returns_
 
@@ -520,7 +521,7 @@ attributes.
 _Parameters_
 
 -   _attributes_ `Object`: Block attributes.
--   _isFluidFontSizeActive_ `boolean`: Whether the function should try to convert font sizes to fluid values.
+-   _fluidTypographySettings_ `Object|boolean`: If boolean, whether the function should try to convert font sizes to fluid values, otherwise an object containing theme fluid typography settings.
 
 _Returns_
 

packages/block-editor/src/components/font-sizes/fluid-utils.js

@@ -40,6 +40,7 @@ const DEFAULT_MINIMUM_FONT_SIZE_LIMIT = '14px';
  * @param {?string}       args.minimumFontSize       Minimum font size for any clamp() calculation. Optional.
  * @param {?number}       args.scaleFactor           A scale factor to determine how fast a font scales within boundaries. Optional.
  * @param {?number}       args.minimumFontSizeFactor How much to scale defaultFontSize by to derive minimumFontSize. Optional.
+ * @param {?string}       args.minimumFontSizeLimit  The smallest a calculated font size may be. Optional.
  *
  * @return {string|null} A font-size value using clamp().
  */
@@ -51,8 +52,13 @@ export function getComputedFluidTypographyValue( {
 	maximumViewPortWidth = DEFAULT_MAXIMUM_VIEWPORT_WIDTH,
 	scaleFactor = DEFAULT_SCALE_FACTOR,
 	minimumFontSizeFactor = DEFAULT_MINIMUM_FONT_SIZE_FACTOR,
-	minimumFontSizeLimit = DEFAULT_MINIMUM_FONT_SIZE_LIMIT,
+	minimumFontSizeLimit,
 } ) {
+	// Validate incoming settings and set defaults.
+	minimumFontSizeLimit = !! getTypographyValueAndUnit( minimumFontSizeLimit )
+		? minimumFontSizeLimit
+		: DEFAULT_MINIMUM_FONT_SIZE_LIMIT;
+
 	/*
 	 * Calculates missing minimumFontSize and maximumFontSize from
 	 * defaultFontSize if provided.

packages/block-editor/src/hooks/font-size.js

@@ -324,13 +324,22 @@ function addEditPropsForFluidCustomFontSizes( blockType ) {
 		// BlockListContext.Provider. If we set fontSize using editor.
 		// BlockListBlock instead of using getEditWrapperProps then the value is
 		// clobbered when the core/style/addEditProps filter runs.
-		const isFluidTypographyEnabled =
-			!! select( blockEditorStore ).getSettings().__experimentalFeatures
+		const fluidTypographyConfig =
+			select( blockEditorStore ).getSettings().__experimentalFeatures
 				?.typography?.fluid;
 
+		const fluidTypographySettings =
+			typeof fluidTypographyConfig === 'object'
+				? fluidTypographyConfig
+				: {};
+
 		const newFontSize =
-			fontSize && isFluidTypographyEnabled
-				? getComputedFluidTypographyValue( { fontSize } )
+			fontSize && !! fluidTypographyConfig
+				? getComputedFluidTypographyValue( {
+						fontSize,
+						minimumFontSizeLimit:
+							fluidTypographySettings?.minFontSize,
+				  } )
 				: null;
 
 		if ( newFontSize === null ) {

packages/block-editor/src/hooks/test/use-typography-props.js

@@ -47,4 +47,30 @@ describe( 'getTypographyClassesAndStyles', () => {
 			},
 		} );
 	} );
+
+	it( 'should return configured fluid font size styles', () => {
+		const attributes = {
+			fontFamily: 'tofu',
+			style: {
+				typography: {
+					textDecoration: 'underline',
+					fontSize: '2rem',
+					textTransform: 'uppercase',
+				},
+			},
+		};
+		expect(
+			getTypographyClassesAndStyles( attributes, {
+				minFontSize: '1rem',
+			} )
+		).toEqual( {
+			className: 'has-tofu-font-family',
+			style: {
+				textDecoration: 'underline',
+				fontSize:
+					'clamp(1.5rem, 1.5rem + ((1vw - 0.48rem) * 0.962), 2rem)',
+				textTransform: 'uppercase',
+			},
+		} );
+	} );
 } );

packages/block-editor/src/hooks/use-typography-props.js

@@ -19,23 +19,31 @@ import { getComputedFluidTypographyValue } from '../components/font-sizes/fluid-
  * Provides the CSS class names and inline styles for a block's typography support
  * attributes.
  *
- * @param {Object}  attributes            Block attributes.
- * @param {boolean} isFluidFontSizeActive Whether the function should try to convert font sizes to fluid values.
+ * @param {Object}         attributes              Block attributes.
+ * @param {Object|boolean} fluidTypographySettings If boolean, whether the function should try to convert font sizes to fluid values,
+ *                                                 otherwise an object containing theme fluid typography settings.
  *
  * @return {Object} Typography block support derived CSS classes & styles.
  */
 export function getTypographyClassesAndStyles(
 	attributes,
-	isFluidFontSizeActive
+	fluidTypographySettings
 ) {
 	let typographyStyles = attributes?.style?.typography || {};
 
-	if ( isFluidFontSizeActive ) {
+	if (
+		!! fluidTypographySettings &&
+		( true === fluidTypographySettings ||
+			Object.keys( fluidTypographySettings ).length !== 0 )
+	) {
+		const newFontSize =
+			getComputedFluidTypographyValue( {
+				fontSize: attributes?.style?.typography?.fontSize,
+				minimumFontSizeLimit: fluidTypographySettings?.minFontSize,
+			} ) || attributes?.style?.typography?.fontSize;
 		typographyStyles = {
 			...typographyStyles,
-			fontSize: getComputedFluidTypographyValue( {
-				fontSize: attributes?.style?.typography?.fontSize,
-			} ),
+			fontSize: newFontSize,
 		};
 	}
 

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

@@ -114,10 +114,10 @@ export default function SearchEdit( {
 	}
 
 	const colorProps = useColorProps( attributes );
-	const fluidTypographyEnabled = useSetting( 'typography.fluid' );
+	const fluidTypographySettings = useSetting( 'typography.fluid' );
 	const typographyProps = useTypographyProps(
 		attributes,
-		fluidTypographyEnabled
+		fluidTypographySettings
 	);
 	const unitControlInstanceId = useInstanceId( UnitControl );
 	const unitControlInputId = `wp-block-search__width-${ unitControlInstanceId }`;

packages/edit-site/CHANGELOG.md

@@ -4,7 +4,11 @@
 
 ### Breaking Changes
 
--   Updated dependencies to require React 18 ([45235](https://github.com/WordPress/gutenberg/pull/45235))
+-   Updated dependencies to require React 18 ([45235](https://github.com/WordPress/gutenberg/pull/45235)).
+
+### Enhancements
+
+-   Fluid typography: add configurable fluid typography settings for minimum font size to theme.json ([#42489](https://github.com/WordPress/gutenberg/pull/42489)).
 
 ## 4.19.0 (2022-11-16)