WP 6.1: backport fluid typography

lib/block-supports/typography.php

@@ -108,7 +108,11 @@ function gutenberg_apply_typography_support( $block_type, $block_attributes ) {
 	if ( $has_font_size_support && ! $should_skip_font_size ) {
 		$preset_font_size                    = array_key_exists( 'fontSize', $block_attributes ) ? "var:preset|font-size|{$block_attributes['fontSize']}" : null;
 		$custom_font_size                    = isset( $block_attributes['style']['typography']['fontSize'] ) ? $block_attributes['style']['typography']['fontSize'] : null;
-		$typography_block_styles['fontSize'] = $preset_font_size ? $preset_font_size : $custom_font_size;
+		$typography_block_styles['fontSize'] = $preset_font_size ? $preset_font_size : gutenberg_get_typography_font_size_value(
+			array(
+				'size' => $custom_font_size,
+			)
+		);
 	}
 
 	if ( $has_font_family_support && ! $should_skip_font_family ) {
@@ -228,13 +232,42 @@ function gutenberg_typography_get_css_variable_inline_style( $attributes, $featu
 	return sprintf( '%s:var(--wp--preset--%s--%s);', $css_property, $css_property, $slug );
 }
 
+/**
+ * Renders typography styles/content to the block wrapper.
+ *
+ * @param  string $block_content Rendered block content.
+ * @param  array  $block         Block object.
+ * @return string                Filtered block content.
+ */
+function gutenberg_render_typography_support( $block_content, $block ) {
+	if ( ! isset( $block['attrs']['style']['typography']['fontSize'] ) ) {
+		return $block_content;
+	}
+
+	$custom_font_size = $block['attrs']['style']['typography']['fontSize'];
+	$fluid_font_size  = gutenberg_get_typography_font_size_value( array( 'size' => $custom_font_size ) );
+
+	/*
+	 * Checks that $fluid_font_size does not match $custom_font_size,
+	 * which means it's been mutated by the fluid font size functions.
+	 */
+	if ( ! empty( $fluid_font_size ) && $fluid_font_size !== $custom_font_size ) {
+		// Replaces the first instance of `font-size:$custom_font_size` with `font-size:$fluid_font_size`.
+		return preg_replace( '/font-size\s*:\s*' . preg_quote( $custom_font_size, '/' ) . '\s*;?/', 'font-size:' . esc_attr( $fluid_font_size ) . ';', $block_content, 1 );
+	}
+
+	return $block_content;
+
+}
+
 /**
  * Internal method that checks a string for a unit and value and returns an array consisting of `'value'` and `'unit'`, e.g., [ '42', 'rem' ].
+ * A raw font size of `value + unit` is expected. If the value is a number, it will convert to `value + 'px'`.
  *
  * @access private
  *
- * @param string $raw_value Raw size value from theme.json.
- * @param array  $options   {
+ * @param string|int|float $raw_value Raw size value from theme.json.
+ * @param array            $options   {
  *     Optional. An associative array of options. Default is empty array.
  *
  *     @type string        $coerce_to        Coerce the value to rem or px. Default `'rem'`.
@@ -244,10 +277,25 @@ function gutenberg_typography_get_css_variable_inline_style( $attributes, $featu
  * @return array An array consisting of `'value'` and `'unit'` properties.
  */
 function gutenberg_get_typography_value_and_unit( $raw_value, $options = array() ) {
+	if ( ! is_string( $raw_value ) && ! is_int( $raw_value ) && ! is_float( $raw_value ) ) {
+		_doing_it_wrong(
+			__FUNCTION__,
+			__( 'Raw size value must be a string, integer or a float.', 'gutenberg' ),
+			'6.1.0'
+		);
+		return null;
+	}
+
+	// Converts numeric values to pixel values by default.
 	if ( empty( $raw_value ) ) {
 		return null;
 	}
 
+	// Converts numbers to pixel values by default.
+	if ( is_numeric( $raw_value ) ) {
+		$raw_value = $raw_value . 'px';
+	}
+
 	$defaults = array(
 		'coerce_to'        => '',
 		'root_size_value'  => 16,
@@ -368,15 +416,27 @@ function gutenberg_get_computed_fluid_typography_value( $args = array() ) {
  * @param array $preset                     {
  *     Required. fontSizes preset value as seen in theme.json.
  *
- *     @type string $name Name of the font size preset.
- *     @type string $slug Kebab-case unique identifier for the font size preset.
- *     @type string $size CSS font-size value, including units where applicable.
+ *     @type string           $name Name of the font size preset.
+ *     @type string           $slug Kebab-case unique identifier for the font size preset.
+ *     @type string|int|float $size CSS font-size value, including units where applicable.
  * }
  * @param bool  $should_use_fluid_typography An override to switch fluid typography "on". Can be used for unit testing. Default is `false`.
  *
- * @return string Font-size value.
+ * @return string|null Font-size value or `null` if a size is not passed in $preset.
  */
 function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_typography = false ) {
+	if ( ! isset( $preset['size'] ) ) {
+		return null;
+	}
+
+	/*
+	 * Catches empty values and 0/'0'.
+	 * Fluid calculations cannot be performed on 0.
+	 */
+	if ( empty( $preset['size'] ) ) {
+		return $preset['size'];
+	}
+
 	// Check 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;
@@ -446,3 +506,8 @@ function gutenberg_get_typography_font_size_value( $preset, $should_use_fluid_ty
 		'apply'              => 'gutenberg_apply_typography_support',
 	)
 );
+
+if ( function_exists( 'wp_render_typography_support' ) ) {
+	remove_filter( 'render_block', 'wp_render_typography_support' );
+}
+add_filter( 'render_block', 'gutenberg_render_typography_support', 10, 2 );

lib/compat/wordpress-6.1/class-wp-theme-json-6-1.php

@@ -967,6 +967,18 @@ protected static function compute_style_properties( $styles, $settings = array()
 				continue;
 			}
 
+			// Calculates fluid typography rules where available.
+			if ( 'font-size' === $css_property ) {
+				/*
+				 * gutenberg_get_typography_font_size_value() will check
+				 * if fluid typography has been activated and also
+				 * whether the incoming value can be converted to a fluid value.
+				 * Values that already have a "clamp()" function will not pass the test,
+				 * and therefore the original $value will be returned.
+				 */
+				$value = gutenberg_get_typography_font_size_value( array( 'size' => $value ) );
+			}
+
 			$declarations[] = array(
 				'name'  => $css_property,
 				'value' => $value,

packages/block-editor/CHANGELOG.md

@@ -2,6 +2,15 @@
 
 ## Unreleased
 
+### Bug Fix
+
+-   `FontSizePicker`: Update fluid utils so that only string, floats and integers are treated as valid font sizes for the purposes of fluid typography ([#44847](https://github.com/WordPress/gutenberg/pull/44847))
+-   `getTypographyClassesAndStyles()`: Ensure that font sizes are transformed into fluid values if fluid typography is activated ([#44852](https://github.com/WordPress/gutenberg/pull/44852))
+
+## 10.2.0 (2022-10-05)
+
+## 10.1.0 (2022-09-21)
+
 ## 10.0.0 (2022-09-13)
 
 ### Breaking change

packages/block-editor/README.md

@@ -395,6 +395,45 @@ _Returns_
 
 -   `?Object`: Color object included in the colors array whose color property equals colorValue. Returns undefined if no color object matches this requirement.
 
+### getComputedFluidTypographyValue
+
+Computes a fluid font-size value that uses clamp(). A minimum and maxinmum
+font size OR a single font size can be specified.
+
+If a single font size is specified, it is scaled up and down by
+minimumFontSizeFactor and maximumFontSizeFactor to arrive at the minimum and
+maximum sizes.
+
+_Usage_
+
+```js
+// Calculate fluid font-size value from a minimum and maximum value.
+const fontSize = getComputedFluidTypographyValue( {
+	minimumFontSize: '20px',
+	maximumFontSize: '45px',
+} );
+// Calculate fluid font-size value from a single font size.
+const fontSize = getComputedFluidTypographyValue( {
+	fontSize: '30px',
+} );
+```
+
+_Parameters_
+
+-   _args_ `Object`:
+-   _args.minimumViewPortWidth_ `?string`: Minimum viewport size from which type will have fluidity. Optional if fontSize is specified.
+-   _args.maximumViewPortWidth_ `?string`: Maximum size up to which type will have fluidity. Optional if fontSize is specified.
+-   _args.fontSize_ `[string|number]`: Size to derive maximumFontSize and minimumFontSize from, if necessary. Optional if minimumFontSize and maximumFontSize are specified.
+-   _args.maximumFontSize_ `?string`: Maximum font size for any clamp() calculation. Optional.
+-   _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.maximumFontSizeFactor_ `?number`: How much to scale defaultFontSize by to derive maximumFontSize. Optional.
+
+_Returns_
+
+-   `string|null`: A font-size value using clamp().
+
 ### getFontSize
 
 Returns the font size object based on an array of named font sizes and the namedFontSize and customFontSize values.
@@ -482,6 +521,7 @@ attributes.
 _Parameters_
 
 -   _attributes_ `Object`: Block attributes.
+-   _isFluidFontSizeActive_ `boolean`: Whether the function should try to convert font sizes to fluid values.
 
 _Returns_