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Diffstat (limited to 'wp-includes/block-supports/typography.php')
| -rw-r--r-- | wp-includes/block-supports/typography.php | 652 |
1 files changed, 652 insertions, 0 deletions
diff --git a/wp-includes/block-supports/typography.php b/wp-includes/block-supports/typography.php new file mode 100644 index 0000000..bccde4f --- /dev/null +++ b/wp-includes/block-supports/typography.php @@ -0,0 +1,652 @@ +<?php +/** + * Typography block support flag. + * + * @package WordPress + * @since 5.6.0 + */ + +/** + * Registers the style and typography block attributes for block types that support it. + * + * @since 5.6.0 + * @since 6.3.0 Added support for text-columns. + * @access private + * + * @param WP_Block_Type $block_type Block Type. + */ +function wp_register_typography_support( $block_type ) { + if ( ! ( $block_type instanceof WP_Block_Type ) ) { + return; + } + + $typography_supports = isset( $block_type->supports['typography'] ) ? $block_type->supports['typography'] : false; + if ( ! $typography_supports ) { + return; + } + + $has_font_family_support = isset( $typography_supports['__experimentalFontFamily'] ) ? $typography_supports['__experimentalFontFamily'] : false; + $has_font_size_support = isset( $typography_supports['fontSize'] ) ? $typography_supports['fontSize'] : false; + $has_font_style_support = isset( $typography_supports['__experimentalFontStyle'] ) ? $typography_supports['__experimentalFontStyle'] : false; + $has_font_weight_support = isset( $typography_supports['__experimentalFontWeight'] ) ? $typography_supports['__experimentalFontWeight'] : false; + $has_letter_spacing_support = isset( $typography_supports['__experimentalLetterSpacing'] ) ? $typography_supports['__experimentalLetterSpacing'] : false; + $has_line_height_support = isset( $typography_supports['lineHeight'] ) ? $typography_supports['lineHeight'] : false; + $has_text_columns_support = isset( $typography_supports['textColumns'] ) ? $typography_supports['textColumns'] : false; + $has_text_decoration_support = isset( $typography_supports['__experimentalTextDecoration'] ) ? $typography_supports['__experimentalTextDecoration'] : false; + $has_text_transform_support = isset( $typography_supports['__experimentalTextTransform'] ) ? $typography_supports['__experimentalTextTransform'] : false; + $has_writing_mode_support = isset( $typography_supports['__experimentalWritingMode'] ) ? $typography_supports['__experimentalWritingMode'] : false; + + $has_typography_support = $has_font_family_support + || $has_font_size_support + || $has_font_style_support + || $has_font_weight_support + || $has_letter_spacing_support + || $has_line_height_support + || $has_text_columns_support + || $has_text_decoration_support + || $has_text_transform_support + || $has_writing_mode_support; + + if ( ! $block_type->attributes ) { + $block_type->attributes = array(); + } + + if ( $has_typography_support && ! array_key_exists( 'style', $block_type->attributes ) ) { + $block_type->attributes['style'] = array( + 'type' => 'object', + ); + } + + if ( $has_font_size_support && ! array_key_exists( 'fontSize', $block_type->attributes ) ) { + $block_type->attributes['fontSize'] = array( + 'type' => 'string', + ); + } + + if ( $has_font_family_support && ! array_key_exists( 'fontFamily', $block_type->attributes ) ) { + $block_type->attributes['fontFamily'] = array( + 'type' => 'string', + ); + } +} + +/** + * Adds CSS classes and inline styles for typography features such as font sizes + * to the incoming attributes array. This will be applied to the block markup in + * the front-end. + * + * @since 5.6.0 + * @since 6.1.0 Used the style engine to generate CSS and classnames. + * @since 6.3.0 Added support for text-columns. + * @access private + * + * @param WP_Block_Type $block_type Block type. + * @param array $block_attributes Block attributes. + * @return array Typography CSS classes and inline styles. + */ +function wp_apply_typography_support( $block_type, $block_attributes ) { + if ( ! ( $block_type instanceof WP_Block_Type ) ) { + return array(); + } + + $typography_supports = isset( $block_type->supports['typography'] ) + ? $block_type->supports['typography'] + : false; + if ( ! $typography_supports ) { + return array(); + } + + if ( wp_should_skip_block_supports_serialization( $block_type, 'typography' ) ) { + return array(); + } + + $has_font_family_support = isset( $typography_supports['__experimentalFontFamily'] ) ? $typography_supports['__experimentalFontFamily'] : false; + $has_font_size_support = isset( $typography_supports['fontSize'] ) ? $typography_supports['fontSize'] : false; + $has_font_style_support = isset( $typography_supports['__experimentalFontStyle'] ) ? $typography_supports['__experimentalFontStyle'] : false; + $has_font_weight_support = isset( $typography_supports['__experimentalFontWeight'] ) ? $typography_supports['__experimentalFontWeight'] : false; + $has_letter_spacing_support = isset( $typography_supports['__experimentalLetterSpacing'] ) ? $typography_supports['__experimentalLetterSpacing'] : false; + $has_line_height_support = isset( $typography_supports['lineHeight'] ) ? $typography_supports['lineHeight'] : false; + $has_text_columns_support = isset( $typography_supports['textColumns'] ) ? $typography_supports['textColumns'] : false; + $has_text_decoration_support = isset( $typography_supports['__experimentalTextDecoration'] ) ? $typography_supports['__experimentalTextDecoration'] : false; + $has_text_transform_support = isset( $typography_supports['__experimentalTextTransform'] ) ? $typography_supports['__experimentalTextTransform'] : false; + $has_writing_mode_support = isset( $typography_supports['__experimentalWritingMode'] ) ? $typography_supports['__experimentalWritingMode'] : false; + + // Whether to skip individual block support features. + $should_skip_font_size = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontSize' ); + $should_skip_font_family = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontFamily' ); + $should_skip_font_style = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontStyle' ); + $should_skip_font_weight = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontWeight' ); + $should_skip_line_height = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'lineHeight' ); + $should_skip_text_columns = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textColumns' ); + $should_skip_text_decoration = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textDecoration' ); + $should_skip_text_transform = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textTransform' ); + $should_skip_letter_spacing = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'letterSpacing' ); + $should_skip_writing_mode = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'writingMode' ); + + $typography_block_styles = array(); + 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 : wp_get_typography_font_size_value( + array( + 'size' => $custom_font_size, + ) + ); + } + + if ( $has_font_family_support && ! $should_skip_font_family ) { + $preset_font_family = array_key_exists( 'fontFamily', $block_attributes ) + ? "var:preset|font-family|{$block_attributes['fontFamily']}" + : null; + $custom_font_family = isset( $block_attributes['style']['typography']['fontFamily'] ) + ? wp_typography_get_preset_inline_style_value( $block_attributes['style']['typography']['fontFamily'], 'font-family' ) + : null; + $typography_block_styles['fontFamily'] = $preset_font_family ? $preset_font_family : $custom_font_family; + } + + if ( + $has_font_style_support && + ! $should_skip_font_style && + isset( $block_attributes['style']['typography']['fontStyle'] ) + ) { + $typography_block_styles['fontStyle'] = wp_typography_get_preset_inline_style_value( + $block_attributes['style']['typography']['fontStyle'], + 'font-style' + ); + } + + if ( + $has_font_weight_support && + ! $should_skip_font_weight && + isset( $block_attributes['style']['typography']['fontWeight'] ) + ) { + $typography_block_styles['fontWeight'] = wp_typography_get_preset_inline_style_value( + $block_attributes['style']['typography']['fontWeight'], + 'font-weight' + ); + } + + if ( $has_line_height_support && ! $should_skip_line_height ) { + $typography_block_styles['lineHeight'] = isset( $block_attributes['style']['typography']['lineHeight'] ) + ? $block_attributes['style']['typography']['lineHeight'] + : null; + } + + if ( $has_text_columns_support && ! $should_skip_text_columns && isset( $block_attributes['style']['typography']['textColumns'] ) ) { + $typography_block_styles['textColumns'] = isset( $block_attributes['style']['typography']['textColumns'] ) + ? $block_attributes['style']['typography']['textColumns'] + : null; + } + + if ( + $has_text_decoration_support && + ! $should_skip_text_decoration && + isset( $block_attributes['style']['typography']['textDecoration'] ) + ) { + $typography_block_styles['textDecoration'] = wp_typography_get_preset_inline_style_value( + $block_attributes['style']['typography']['textDecoration'], + 'text-decoration' + ); + } + + if ( + $has_text_transform_support && + ! $should_skip_text_transform && + isset( $block_attributes['style']['typography']['textTransform'] ) + ) { + $typography_block_styles['textTransform'] = wp_typography_get_preset_inline_style_value( + $block_attributes['style']['typography']['textTransform'], + 'text-transform' + ); + } + + if ( + $has_letter_spacing_support && + ! $should_skip_letter_spacing && + isset( $block_attributes['style']['typography']['letterSpacing'] ) + ) { + $typography_block_styles['letterSpacing'] = wp_typography_get_preset_inline_style_value( + $block_attributes['style']['typography']['letterSpacing'], + 'letter-spacing' + ); + } + + if ( $has_writing_mode_support && + ! $should_skip_writing_mode && + isset( $block_attributes['style']['typography']['writingMode'] ) + ) { + $typography_block_styles['writingMode'] = isset( $block_attributes['style']['typography']['writingMode'] ) + ? $block_attributes['style']['typography']['writingMode'] + : null; + } + + $attributes = array(); + $styles = wp_style_engine_get_styles( + array( 'typography' => $typography_block_styles ), + array( 'convert_vars_to_classnames' => true ) + ); + + if ( ! empty( $styles['classnames'] ) ) { + $attributes['class'] = $styles['classnames']; + } + + if ( ! empty( $styles['css'] ) ) { + $attributes['style'] = $styles['css']; + } + + return $attributes; +} + +/** + * Generates an inline style value for a typography feature e.g. text decoration, + * text transform, and font style. + * + * Note: This function is for backwards compatibility. + * * It is necessary to parse older blocks whose typography styles contain presets. + * * It mostly replaces the deprecated `wp_typography_get_css_variable_inline_style()`, + * but skips compiling a CSS declaration as the style engine takes over this role. + * @link https://github.com/wordpress/gutenberg/pull/27555 + * + * @since 6.1.0 + * + * @param string $style_value A raw style value for a single typography feature from a block's style attribute. + * @param string $css_property Slug for the CSS property the inline style sets. + * @return string A CSS inline style value. + */ +function wp_typography_get_preset_inline_style_value( $style_value, $css_property ) { + // If the style value is not a preset CSS variable go no further. + if ( empty( $style_value ) || ! str_contains( $style_value, "var:preset|{$css_property}|" ) ) { + return $style_value; + } + + /* + * For backwards compatibility. + * Presets were removed in WordPress/gutenberg#27555. + * A preset CSS variable is the style. + * Gets the style value from the string and return CSS style. + */ + $index_to_splice = strrpos( $style_value, '|' ) + 1; + $slug = _wp_to_kebab_case( substr( $style_value, $index_to_splice ) ); + + // Return the actual CSS inline style value, + // e.g. `var(--wp--preset--text-decoration--underline);`. + return sprintf( 'var(--wp--preset--%s--%s);', $css_property, $slug ); +} + +/** + * Renders typography styles/content to the block wrapper. + * + * @since 6.1.0 + * + * @param string $block_content Rendered block content. + * @param array $block Block object. + * @return string Filtered block content. + */ +function wp_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 = wp_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; +} + +/** + * Checks a string for a unit and value and returns an array + * consisting of `'value'` and `'unit'`, e.g. array( '42', 'rem' ). + * + * @since 6.1.0 + * + * @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'`. + * @type int $root_size_value Value of root font size for rem|em <-> px conversion. Default `16`. + * @type string[] $acceptable_units An array of font size units. Default `array( 'rem', 'px', 'em' )`; + * } + * @return array|null An array consisting of `'value'` and `'unit'` properties on success. + * `null` on failure. + */ +function wp_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 float.' ), + '6.1.0' + ); + return null; + } + + 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, + 'acceptable_units' => array( 'rem', 'px', 'em' ), + ); + + $options = wp_parse_args( $options, $defaults ); + + $acceptable_units_group = implode( '|', $options['acceptable_units'] ); + $pattern = '/^(\d*\.?\d+)(' . $acceptable_units_group . '){1,1}$/'; + + preg_match( $pattern, $raw_value, $matches ); + + // Bails out if not a number value and a px or rem unit. + if ( ! isset( $matches[1] ) || ! isset( $matches[2] ) ) { + return null; + } + + $value = $matches[1]; + $unit = $matches[2]; + + /* + * Default browser font size. Later, possibly could inject some JS to + * compute this `getComputedStyle( document.querySelector( "html" ) ).fontSize`. + */ + if ( 'px' === $options['coerce_to'] && ( 'em' === $unit || 'rem' === $unit ) ) { + $value = $value * $options['root_size_value']; + $unit = $options['coerce_to']; + } + + if ( 'px' === $unit && ( 'em' === $options['coerce_to'] || 'rem' === $options['coerce_to'] ) ) { + $value = $value / $options['root_size_value']; + $unit = $options['coerce_to']; + } + + /* + * No calculation is required if swapping between em and rem yet, + * since we assume a root size value. Later we might like to differentiate between + * :root font size (rem) and parent element font size (em) relativity. + */ + if ( ( 'em' === $options['coerce_to'] || 'rem' === $options['coerce_to'] ) && ( 'em' === $unit || 'rem' === $unit ) ) { + $unit = $options['coerce_to']; + } + + return array( + 'value' => round( $value, 3 ), + 'unit' => $unit, + ); +} + +/** + * Internal implementation of CSS clamp() based on available min/max viewport + * width and min/max font sizes. + * + * @since 6.1.0 + * @since 6.3.0 Checks for unsupported min/max viewport values that cause invalid clamp values. + * @access private + * + * @param array $args { + * Optional. An associative array of values to calculate a fluid formula + * for font size. Default is empty array. + * + * @type string $maximum_viewport_width Maximum size up to which type will have fluidity. + * @type string $minimum_viewport_width Minimum viewport size from which type will have fluidity. + * @type string $maximum_font_size Maximum font size for any clamp() calculation. + * @type string $minimum_font_size Minimum font size for any clamp() calculation. + * @type int $scale_factor A scale factor to determine how fast a font scales within boundaries. + * } + * @return string|null A font-size value using clamp() on success, otherwise null. + */ +function wp_get_computed_fluid_typography_value( $args = array() ) { + $maximum_viewport_width_raw = isset( $args['maximum_viewport_width'] ) ? $args['maximum_viewport_width'] : null; + $minimum_viewport_width_raw = isset( $args['minimum_viewport_width'] ) ? $args['minimum_viewport_width'] : null; + $maximum_font_size_raw = isset( $args['maximum_font_size'] ) ? $args['maximum_font_size'] : null; + $minimum_font_size_raw = isset( $args['minimum_font_size'] ) ? $args['minimum_font_size'] : null; + $scale_factor = isset( $args['scale_factor'] ) ? $args['scale_factor'] : null; + + // Normalizes the minimum font size in order to use the value for calculations. + $minimum_font_size = wp_get_typography_value_and_unit( $minimum_font_size_raw ); + + /* + * We get a 'preferred' unit to keep units consistent when calculating, + * otherwise the result will not be accurate. + */ + $font_size_unit = isset( $minimum_font_size['unit'] ) ? $minimum_font_size['unit'] : 'rem'; + + // Normalizes the maximum font size in order to use the value for calculations. + $maximum_font_size = wp_get_typography_value_and_unit( + $maximum_font_size_raw, + array( + 'coerce_to' => $font_size_unit, + ) + ); + + // Checks for mandatory min and max sizes, and protects against unsupported units. + if ( ! $maximum_font_size || ! $minimum_font_size ) { + return null; + } + + // Uses rem for accessible fluid target font scaling. + $minimum_font_size_rem = wp_get_typography_value_and_unit( + $minimum_font_size_raw, + array( + 'coerce_to' => 'rem', + ) + ); + + // Viewport widths defined for fluid typography. Normalize units. + $maximum_viewport_width = wp_get_typography_value_and_unit( + $maximum_viewport_width_raw, + array( + 'coerce_to' => $font_size_unit, + ) + ); + $minimum_viewport_width = wp_get_typography_value_and_unit( + $minimum_viewport_width_raw, + array( + 'coerce_to' => $font_size_unit, + ) + ); + + // Protects against unsupported units in min and max viewport widths. + if ( ! $minimum_viewport_width || ! $maximum_viewport_width ) { + return null; + } + + /* + * Build CSS rule. + * Borrowed from https://websemantics.uk/tools/responsive-font-calculator/. + */ + $view_port_width_offset = round( $minimum_viewport_width['value'] / 100, 3 ) . $font_size_unit; + $linear_factor = 100 * ( ( $maximum_font_size['value'] - $minimum_font_size['value'] ) / ( $maximum_viewport_width['value'] - $minimum_viewport_width['value'] ) ); + $linear_factor_scaled = round( $linear_factor * $scale_factor, 3 ); + $linear_factor_scaled = empty( $linear_factor_scaled ) ? 1 : $linear_factor_scaled; + $fluid_target_font_size = implode( '', $minimum_font_size_rem ) . " + ((1vw - $view_port_width_offset) * $linear_factor_scaled)"; + + return "clamp($minimum_font_size_raw, $fluid_target_font_size, $maximum_font_size_raw)"; +} + +/** + * Returns a font-size value based on a given font-size preset. + * Takes into account fluid typography parameters and attempts to return a CSS + * formula depending on available, valid values. + * + * @since 6.1.0 + * @since 6.1.1 Adjusted rules for min and max font sizes. + * @since 6.2.0 Added 'settings.typography.fluid.minFontSize' support. + * @since 6.3.0 Using layout.wideSize as max viewport width, and logarithmic scale factor to calculate minimum font scale. + * @since 6.4.0 Added configurable min and max viewport width values to the typography.fluid theme.json schema. + * + * @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|int|float $size CSS font-size value, including units if 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|null Font-size value or null if a size is not passed in $preset. + */ +function wp_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']; + } + + // Checks if fluid font sizes are activated. + $global_settings = wp_get_global_settings(); + $typography_settings = isset( $global_settings['typography'] ) ? $global_settings['typography'] : array(); + $layout_settings = isset( $global_settings['layout'] ) ? $global_settings['layout'] : array(); + + if ( + isset( $typography_settings['fluid'] ) && + ( true === $typography_settings['fluid'] || is_array( $typography_settings['fluid'] ) ) + ) { + $should_use_fluid_typography = true; + } + + 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 = '320px'; + $default_minimum_font_size_factor_max = 0.75; + $default_minimum_font_size_factor_min = 0.25; + $default_scale_factor = 1; + $default_minimum_font_size_limit = '14px'; + + // Defaults overrides. + $minimum_viewport_width = isset( $fluid_settings['minViewportWidth'] ) ? $fluid_settings['minViewportWidth'] : $default_minimum_viewport_width; + $maximum_viewport_width = isset( $layout_settings['wideSize'] ) && ! empty( wp_get_typography_value_and_unit( $layout_settings['wideSize'] ) ) ? $layout_settings['wideSize'] : $default_maximum_viewport_width; + if ( isset( $fluid_settings['maxViewportWidth'] ) ) { + $maximum_viewport_width = $fluid_settings['maxViewportWidth']; + } + $has_min_font_size = isset( $fluid_settings['minFontSize'] ) && ! empty( wp_get_typography_value_and_unit( $fluid_settings['minFontSize'] ) ); + $minimum_font_size_limit = $has_min_font_size ? $fluid_settings['minFontSize'] : $default_minimum_font_size_limit; + + // Font sizes. + $fluid_font_size_settings = isset( $preset['fluid'] ) ? $preset['fluid'] : null; + + // A font size has explicitly bypassed fluid calculations. + if ( false === $fluid_font_size_settings ) { + return $preset['size']; + } + + // Try to grab explicit min and max fluid font sizes. + $minimum_font_size_raw = isset( $fluid_font_size_settings['min'] ) ? $fluid_font_size_settings['min'] : null; + $maximum_font_size_raw = isset( $fluid_font_size_settings['max'] ) ? $fluid_font_size_settings['max'] : null; + + // Font sizes. + $preferred_size = wp_get_typography_value_and_unit( $preset['size'] ); + + // Protects against unsupported units. + if ( empty( $preferred_size['unit'] ) ) { + return $preset['size']; + } + + /* + * Normalizes the minimum font size limit according to the incoming unit, + * in order to perform comparative checks. + */ + $minimum_font_size_limit = wp_get_typography_value_and_unit( + $minimum_font_size_limit, + array( + 'coerce_to' => $preferred_size['unit'], + ) + ); + + // Don't enforce minimum font size if a font size has explicitly set a min and max value. + if ( ! empty( $minimum_font_size_limit ) && ( ! $minimum_font_size_raw && ! $maximum_font_size_raw ) ) { + /* + * If a minimum size was not passed to this function + * and the user-defined font size is lower than $minimum_font_size_limit, + * do not calculate a fluid value. + */ + if ( $preferred_size['value'] <= $minimum_font_size_limit['value'] ) { + return $preset['size']; + } + } + + // If no fluid max font size is available use the incoming value. + if ( ! $maximum_font_size_raw ) { + $maximum_font_size_raw = $preferred_size['value'] . $preferred_size['unit']; + } + + /* + * If no minimumFontSize is provided, create one using + * the given font size multiplied by the min font size scale factor. + */ + if ( ! $minimum_font_size_raw ) { + $preferred_font_size_in_px = 'px' === $preferred_size['unit'] ? $preferred_size['value'] : $preferred_size['value'] * 16; + + /* + * The scale factor is a multiplier that affects how quickly the curve will move towards the minimum, + * that is, how quickly the size factor reaches 0 given increasing font size values. + * For a - b * log2(), lower values of b will make the curve move towards the minimum faster. + * The scale factor is constrained between min and max values. + */ + $minimum_font_size_factor = min( max( 1 - 0.075 * log( $preferred_font_size_in_px, 2 ), $default_minimum_font_size_factor_min ), $default_minimum_font_size_factor_max ); + $calculated_minimum_font_size = round( $preferred_size['value'] * $minimum_font_size_factor, 3 ); + + // Only use calculated min font size if it's > $minimum_font_size_limit value. + if ( ! empty( $minimum_font_size_limit ) && $calculated_minimum_font_size <= $minimum_font_size_limit['value'] ) { + $minimum_font_size_raw = $minimum_font_size_limit['value'] . $minimum_font_size_limit['unit']; + } else { + $minimum_font_size_raw = $calculated_minimum_font_size . $preferred_size['unit']; + } + } + + $fluid_font_size_value = wp_get_computed_fluid_typography_value( + array( + 'minimum_viewport_width' => $minimum_viewport_width, + 'maximum_viewport_width' => $maximum_viewport_width, + 'minimum_font_size' => $minimum_font_size_raw, + 'maximum_font_size' => $maximum_font_size_raw, + 'scale_factor' => $default_scale_factor, + ) + ); + + if ( ! empty( $fluid_font_size_value ) ) { + return $fluid_font_size_value; + } + + return $preset['size']; +} + +// Register the block support. +WP_Block_Supports::get_instance()->register( + 'typography', + array( + 'register_attribute' => 'wp_register_typography_support', + 'apply' => 'wp_apply_typography_support', + ) +); |