adding ui for size presets

packages/edit-site/src/components/global-styles/font-sizes/confirm-delete-font-size-dialog.js

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+/**
+ * WordPress dependencies
+ */
+import {
+	__experimentalConfirmDialog as ConfirmDialog,
+	__experimentalUseNavigator as useNavigator,
+} from '@wordpress/components';
+import { __, sprintf } from '@wordpress/i18n';
+
+function ConfirmDeleteFontSizeDialog( {
+	fontSize,
+	isOpen,
+	toggleOpen,
+	handleRemoveFontSize,
+} ) {
+	const navigator = useNavigator();
+
+	const handleConfirm = async () => {
+		toggleOpen();
+		handleRemoveFontSize( fontSize );
+		navigator.goTo( '/typography/' );
+	};
+
+	const handleCancel = () => {
+		toggleOpen();
+	};
+
+	return (
+		<ConfirmDialog
+			isOpen={ isOpen }
+			cancelButtonText={ __( 'Cancel' ) }
+			confirmButtonText={ __( 'Delete' ) }
+			onCancel={ handleCancel }
+			onConfirm={ handleConfirm }
+			size="medium"
+		>
+			{ fontSize &&
+				sprintf(
+					/* translators: %s: Name of the font size preset. */
+					__(
+						'Are you sure you want to delete "%s" font size preset?'
+					),
+					fontSize.name
+				) }
+		</ConfirmDialog>
+	);
+}
+
+export default ConfirmDeleteFontSizeDialog;

packages/edit-site/src/components/global-styles/font-sizes/font-size-preview.js

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+/**
+ * WordPress dependencies
+ */
+import { privateApis as blockEditorPrivateApis } from '@wordpress/block-editor';
+import { __ } from '@wordpress/i18n';
+
+/**
+ * Internal dependencies
+ */
+import { unlock } from '../../../lock-unlock';
+const { useGlobalStyle } = unlock( blockEditorPrivateApis );
+
+function FontSizePreview( { fontSize } ) {
+	const [ font ] = useGlobalStyle( 'typography' );
+	return (
+		<div
+			className="edit-site-typography-preview"
+			style={ {
+				fontSize: fontSize.size,
+				fontFamily: font?.fontFamily ?? 'serif',
+			} }
+		>
+			{ __( 'Aa' ) }
+		</div>
+	);
+}
+
+export default FontSizePreview;

packages/edit-site/src/components/global-styles/font-sizes/font-size.js

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+/**
+ * WordPress dependencies
+ */
+import { privateApis as blockEditorPrivateApis } from '@wordpress/block-editor';
+import { __, sprintf } from '@wordpress/i18n';
+import {
+	__experimentalSpacer as Spacer,
+	__experimentalUseNavigator as useNavigator,
+	__experimentalView as View,
+	__experimentalHStack as HStack,
+	__experimentalVStack as VStack,
+	privateApis as componentsPrivateApis,
+	Button,
+	FlexItem,
+	ToggleControl,
+} from '@wordpress/components';
+import { moreVertical } from '@wordpress/icons';
+import { useState } from '@wordpress/element';
+
+/**
+ * Internal dependencies
+ */
+import { unlock } from '../../../lock-unlock';
+const {
+	DropdownMenuV2: DropdownMenu,
+	DropdownMenuItemV2: DropdownMenuItem,
+	DropdownMenuItemLabelV2: DropdownMenuItemLabel,
+} = unlock( componentsPrivateApis );
+const { useGlobalSetting } = unlock( blockEditorPrivateApis );
+import ScreenHeader from '../header';
+import FontSizePreview from './font-size-preview';
+import ConfirmDeleteFontSizeDialog from './confirm-delete-font-size-dialog';
+import RenameFontSizeDialog from './rename-font-size-dialog';
+import SizeControl from '../size-control';
+
+function FontSize() {
+	const [ isDeleteConfirmOpen, setIsDeleteConfirmOpen ] = useState( false );
+	const [ isRenameDialogOpen, setIsRenameDialogOpen ] = useState( false );
+
+	const {
+		params: { slug },
+		goBack,
+	} = useNavigator();
+	const [ fontSizes, setFontSizes ] = useGlobalSetting(
+		'typography.fontSizes'
+	);
+	// Get the font sizes from the theme or use the default ones.
+	const sizes = fontSizes.theme ?? fontSizes.default ?? [];
+
+	// Get the font size by slug.
+	const fontSize = sizes.find( ( size ) => size.slug === slug );
+
+	// Whether fluid is true or an object, set it to true, otherwise false.
+	const isFluid = !! fontSize.fluid ?? false;
+
+	// Whether custom fluid values are used.
+	const isCustomFluid = typeof fontSize.fluid === 'object';
+
+	const handleNameChange = ( value ) => {
+		updateFontSize( 'name', value );
+	};
+
+	const handleFontSizeChange = ( value ) => {
+		updateFontSize( 'size', value );
+	};
+
+	const handleFluidChange = ( value ) => {
+		updateFontSize( 'fluid', value );
+	};
+
+	const handleCustomFluidValues = ( value ) => {
+		if ( value ) {
+			// If custom values are used, init the values with the current ones.
+			updateFontSize( 'fluid', {
+				min: fontSize.size,
+				max: fontSize.size,
+			} );
+		} else {
+			// If custom fluid values are disabled, set fluid to true.
+			updateFontSize( 'fluid', true );
+		}
+	};
+
+	const handleMinChange = ( value ) => {
+		updateFontSize( 'fluid', { ...fontSize.fluid, min: value } );
+	};
+
+	const handleMaxChange = ( value ) => {
+		updateFontSize( 'fluid', { ...fontSize.fluid, max: value } );
+	};
+
+	const updateFontSize = ( key, value ) => {
+		const newFontSizes = sizes.map( ( size ) => {
+			if ( size.slug === slug ) {
+				return { ...size, [ key ]: value }; // Create a new object with updated key
+			}
+			return size;
+		} );
+
+		setFontSizes( {
+			...fontSizes,
+			theme: newFontSizes,
+		} );
+	};
+
+	const handleRemoveFontSize = () => {
+		// Navigate to the font sizes list.
+		goBack();
+
+		const newFontSizes = sizes.filter( ( size ) => size.slug !== slug );
+		setFontSizes( {
+			...fontSizes,
+			theme: newFontSizes,
+		} );
+	};
+
+	const toggleDeleteConfirm = () => {
+		setIsDeleteConfirmOpen( ! isDeleteConfirmOpen );
+	};
+
+	const toggleRenameDialog = () => {
+		setIsRenameDialogOpen( ! isRenameDialogOpen );
+	};
+
+	return (
+		<>
+			<ConfirmDeleteFontSizeDialog
+				fontSize={ fontSize }
+				isOpen={ isDeleteConfirmOpen }
+				toggleOpen={ toggleDeleteConfirm }
+				handleRemoveFontSize={ handleRemoveFontSize }
+			/>
+
+			{ isRenameDialogOpen && (
+				<RenameFontSizeDialog
+					fontSize={ fontSize }
+					isOpen={ isRenameDialogOpen }
+					toggleOpen={ toggleRenameDialog }
+					handleRename={ handleNameChange }
+				/>
+			) }
+
+			<VStack spacing={ 4 }>
+				<HStack justify="space-between" align="flex-start">
+					<ScreenHeader
+						title={ fontSize.name }
+						description={ sprintf(
+							/* translators: %s: font size preset name. */
+							__( 'Manage the font size %s.' ),
+							fontSize.name
+						) }
+					/>
+					<FlexItem>
+						<Spacer
+							marginTop={ 3 }
+							marginBottom={ 0 }
+							paddingX={ 4 }
+						>
+							<DropdownMenu
+								trigger={
+									<Button
+										size="small"
+										icon={ moreVertical }
+										label={ __( 'Menu' ) }
+									/>
+								}
+							>
+								<DropdownMenuItem
+									onClick={ toggleRenameDialog }
+								>
+									<DropdownMenuItemLabel>
+										{ __( 'Rename' ) }
+									</DropdownMenuItemLabel>
+								</DropdownMenuItem>
+								<DropdownMenuItem
+									onClick={ toggleDeleteConfirm }
+								>
+									<DropdownMenuItemLabel>
+										{ __( 'Delete' ) }
+									</DropdownMenuItemLabel>
+								</DropdownMenuItem>
+							</DropdownMenu>
+						</Spacer>
+					</FlexItem>
+				</HStack>
+
+				<View>
+					<Spacer paddingX={ 4 }>
+						<VStack spacing={ 4 }>
+							<FlexItem>
+								<FontSizePreview fontSize={ fontSize } />
+							</FlexItem>
+
+							<SizeControl
+								label={ __( 'Size' ) }
+								value={ fontSize.size }
+								onChange={ handleFontSizeChange }
+							/>
+
+							<ToggleControl
+								label={ __( 'Fluid typography' ) }
+								checked={ isFluid }
+								onChange={ handleFluidChange }
+								__nextHasNoMarginBottom
+							/>
+
+							{ isFluid && (
+								<ToggleControl
+									label={ __( 'Custom fluid values' ) }
+									help={ __(
+										'Set custom min and max values for the fluid font size.'
+									) }
+									checked={ isCustomFluid }
+									onChange={ handleCustomFluidValues }
+									__nextHasNoMarginBottom
+								/>
+							) }
+
+							{ isCustomFluid && (
+								<>
+									<SizeControl
+										label={ __( 'Minimum' ) }
+										value={ fontSize.fluid?.min }
+										onChange={ handleMinChange }
+									/>
+									<SizeControl
+										label={ __( 'Maximum' ) }
+										value={ fontSize.fluid?.max }
+										onChange={ handleMaxChange }
+									/>
+								</>
+							) }
+						</VStack>
+					</Spacer>
+				</View>
+			</VStack>
+		</>
+	);
+}
+
+export default FontSize;