Font size: Allow for custom font size handling

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

@@ -4,7 +4,6 @@
 import { addFilter } from '@wordpress/hooks';
 import { hasBlockSupport } from '@wordpress/blocks';
 import TokenList from '@wordpress/token-list';
-import { select } from '@wordpress/data';
 
 /**
  * Internal dependencies
@@ -22,7 +21,6 @@ import {
 	shouldSkipSerialization,
 } from './utils';
 import { useSettings } from '../components/use-settings';
-import { store as blockEditorStore } from '../store';
 import {
 	getTypographyFontSizeValue,
 	getFluidTypographyOptionsFromSettings,
@@ -154,58 +152,61 @@ export function useIsFontSizeDisabled( { name: blockName } = {} ) {
 }
 
 function useBlockProps( { name, fontSize, style } ) {
-	const [ fontSizes ] = useSettings( 'typography.fontSizes' );
+	const [ fontSizes, fluidTypographySettings, layoutSettings ] = useSettings(
+		'typography.fontSizes',
+		'typography.fluid',
+		'layout'
+	);
 
-	// Only add inline styles if the block supports font sizes,
-	// doesn't skip serialization of font sizes,
-	// doesn't already have an inline font size,
-	// and does have a class to extract the font size from.
+	/*
+	 * Only add inline styles if the block supports font sizes,
+	 * doesn't skip serialization of font sizes,
+	 * and has either a custom font size or a preset font size.
+	 */
 	if (
 		! hasBlockSupport( name, FONT_SIZE_SUPPORT_KEY ) ||
 		shouldSkipSerialization( name, TYPOGRAPHY_SUPPORT_KEY, 'fontSize' ) ||
-		! fontSize
+		( ! fontSize && ! style?.typography?.fontSize )
 	) {
 		return;
 	}
 
-	let props = {};
+	let props;
+
+	if ( style?.typography?.fontSize ) {
+		const fluidSettings = getFluidTypographyOptionsFromSettings( {
+			typography: {
+				fluid: fluidTypographySettings,
+			},
+			layout: layoutSettings,
+		} );
 
-	if ( ! style?.typography?.fontSize ) {
 		props = {
 			style: {
-				fontSize: getFontSize(
-					fontSizes,
-					fontSize,
-					style?.typography?.fontSize
-				).size,
+				fontSize: getTypographyFontSizeValue(
+					{ size: style.typography.fontSize },
+					fluidSettings
+				),
 			},
 		};
 	}
 
-	// TODO: This sucks! We should be using useSetting( 'typography.fluid' )
-	// or even useSelect( blockEditorStore ). We can't do either here
-	// because getEditWrapperProps is a plain JavaScript function called by
-	// BlockListBlock and not a React component rendered within
-	// 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.
-
-	// TODO: We can do the thing above now.
-	const fluidTypographySettings = getFluidTypographyOptionsFromSettings(
-		select( blockEditorStore ).getSettings().__experimentalFeatures
-	);
-
 	if ( fontSize ) {
 		props = {
 			style: {
-				fontSize: getTypographyFontSizeValue(
-					{ size: fontSize },
-					fluidTypographySettings
-				),
+				fontSize: getFontSize(
+					fontSizes,
+					fontSize,
+					style?.typography?.fontSize
+				).size,
 			},
 		};
 	}
 
+	if ( ! props ) {
+		return;
+	}
+
 	return addSaveProps( props, name, { fontSize } );
 }
 

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

@@ -0,0 +1,164 @@
+/**
+ * External dependencies
+ */
+import { renderHook } from '@testing-library/react';
+
+/**
+ * WordPress dependencies
+ */
+import { addFilter, removeFilter } from '@wordpress/hooks';
+import {
+	getBlockTypes,
+	registerBlockType,
+	unregisterBlockType,
+} from '@wordpress/blocks';
+
+/**
+ * Internal dependencies
+ */
+import _fontSize from '../font-size';
+
+const noop = () => {};
+
+function addUseSettingFilter( callback ) {
+	addFilter(
+		'blockEditor.useSetting.before',
+		'test/useSetting.before',
+		callback
+	);
+}
+
+describe( 'useBlockProps', () => {
+	const blockSettings = {
+		save: () => noop,
+		category: 'text',
+		title: 'font size title',
+		name: 'test/font-size',
+		supports: {
+			typography: {
+				fontSize: true,
+			},
+		},
+	};
+
+	afterEach( () => {
+		getBlockTypes().forEach( ( block ) => {
+			unregisterBlockType( block.name );
+		} );
+		removeFilter(
+			'blockEditor.useSetting.before',
+			'test/useSetting.before'
+		);
+	} );
+
+	it( 'should return preset classname', () => {
+		registerBlockType( blockSettings.name, blockSettings );
+		addUseSettingFilter( ( result, path ) => {
+			if ( 'typography.fontSizes' === path ) {
+				return [
+					{
+						name: 'A larger font',
+						size: '32px',
+						slug: 'larger',
+					},
+				];
+			}
+
+			if ( 'typography.fluid' === path ) {
+				return false;
+			}
+
+			if ( 'layout' === path ) {
+				return {};
+			}
+
+			return result;
+		} );
+
+		const { result } = renderHook( () =>
+			_fontSize.useBlockProps( {
+				name: blockSettings.name,
+				fontSize: 'larger',
+			} )
+		);
+		const { style, className } = result.current;
+		expect( className ).toBe( 'has-larger-font-size' );
+		expect( style.fontSize ).toBe( '32px' );
+
+		removeFilter(
+			'blockEditor.useSetting.before',
+			'test/useSetting.before'
+		);
+	} );
+
+	it( 'should return custom font size', () => {
+		registerBlockType( blockSettings.name, blockSettings );
+		addUseSettingFilter( ( result, path ) => {
+			if ( 'typography.fontSizes' === path ) {
+				return [];
+			}
+
+			if ( 'typography.fluid' === path ) {
+				return false;
+			}
+
+			if ( 'layout' === path ) {
+				return {};
+			}
+
+			return result;
+		} );
+
+		const { result } = renderHook( () =>
+			_fontSize.useBlockProps( {
+				name: blockSettings.name,
+				style: {
+					typography: {
+						fontSize: '28px',
+					},
+				},
+			} )
+		);
+		const { style } = result.current;
+		expect( style.fontSize ).toBe( '28px' );
+
+		removeFilter(
+			'blockEditor.useSetting.before',
+			'test/useSetting.before'
+		);
+	} );
+
+	it( 'should convert custom font sizes to fluid', () => {
+		registerBlockType( blockSettings.name, blockSettings );
+		addUseSettingFilter( ( result, path ) => {
+			if ( 'typography.fontSizes' === path ) {
+				return [];
+			}
+
+			if ( 'typography.fluid' === path ) {
+				return true;
+			}
+
+			if ( 'layout' === path ) {
+				return {};
+			}
+
+			return result;
+		} );
+
+		const { result } = renderHook( () =>
+			_fontSize.useBlockProps( {
+				name: blockSettings.name,
+				style: {
+					typography: {
+						fontSize: '28px',
+					},
+				},
+			} )
+		);
+		const { style } = result.current;
+		expect( style.fontSize ).toBe(
+			'clamp(17.905px, 1.119rem + ((1vw - 3.2px) * 0.789), 28px)'
+		);
+	} );
+} );