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typography.php
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<?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. * @since 7.0.0 Added support for text-indent. * @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 = $block_type->supports['typography'] ?? false; if ( ! $typography_supports ) { return; } $has_font_family_support = $typography_supports['__experimentalFontFamily'] ?? false; $has_font_size_support = $typography_supports['fontSize'] ?? false; $has_font_style_support = $typography_supports['__experimentalFontStyle'] ?? false; $has_font_weight_support = $typography_supports['__experimentalFontWeight'] ?? false; $has_letter_spacing_support = $typography_supports['__experimentalLetterSpacing'] ?? false; $has_line_height_support = $typography_supports['lineHeight'] ?? false; $has_text_align_support = $typography_supports['textAlign'] ?? false; $has_text_columns_support = $typography_supports['textColumns'] ?? false; $has_text_decoration_support = $typography_supports['__experimentalTextDecoration'] ?? false; $has_text_transform_support = $typography_supports['__experimentalTextTransform'] ?? false; $has_text_indent_support = $typography_supports['textIndent'] ?? false; $has_writing_mode_support = $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_align_support || $has_text_columns_support || $has_text_decoration_support || $has_text_transform_support || $has_text_indent_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. * @since 7.0.0 Added support for text-indent. * @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 = $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 = $typography_supports['__experimentalFontFamily'] ?? false; $has_font_size_support = $typography_supports['fontSize'] ?? false; $has_font_style_support = $typography_supports['__experimentalFontStyle'] ?? false; $has_font_weight_support = $typography_supports['__experimentalFontWeight'] ?? false; $has_letter_spacing_support = $typography_supports['__experimentalLetterSpacing'] ?? false; $has_line_height_support = $typography_supports['lineHeight'] ?? false; $has_text_align_support = $typography_supports['textAlign'] ?? false; $has_text_columns_support = $typography_supports['textColumns'] ?? false; $has_text_decoration_support = $typography_supports['__experimentalTextDecoration'] ?? false; $has_text_transform_support = $typography_supports['__experimentalTextTransform'] ?? false; $has_text_indent_support = $typography_supports['textIndent'] ?? false; $has_writing_mode_support = $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_align = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textAlign' ); $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_text_indent = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textIndent' ); $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 = $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'] = $block_attributes['style']['typography']['lineHeight'] ?? null; } if ( $has_text_align_support && ! $should_skip_text_align ) { $typography_block_styles['textAlign'] = $block_attributes['style']['typography']['textAlign'] ?? null; } if ( $has_text_columns_support && ! $should_skip_text_columns && isset( $block_attributes['style']['typography']['textColumns'] ) ) { $typography_block_styles['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'] = $block_attributes['style']['typography']['writingMode'] ?? null; } if ( $has_text_indent_support && ! $should_skip_text_indent && isset( $block_attributes['style']['typography']['textIndent'] ) ) { $typography_block_styles['textIndent'] = $block_attributes['style']['typography']['textIndent'] ?? null; } $attributes = array(); $classnames = array(); $styles = wp_style_engine_get_styles( array( 'typography' => $typography_block_styles ), array( 'convert_vars_to_classnames' => true ) ); if ( ! empty( $styles['classnames'] ) ) { $classnames[] = $styles['classnames']; } if ( $has_text_align_support && ! $should_skip_text_align && isset( $block_attributes['style']['typography']['textAlign'] ) ) { $classnames[] = 'has-text-align-' . $block_attributes['style']['typography']['textAlign']; } if ( ! empty( $classnames ) ) { $attributes['class'] = implode( ' ', $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 ( ! empty( $block['attrs']['fitText'] ) && $block['attrs']['fitText'] && ! is_admin() ) { wp_enqueue_script_module( '@wordpress/block-editor/utils/fit-text-frontend' ); // Add Interactivity API directives for fit text to work with client-side navigation. if ( ! empty( $block_content ) ) { $processor = new WP_HTML_Tag_Processor( $block_content ); if ( $processor->next_tag() ) { if ( ! $processor->get_attribute( 'data-wp-interactive' ) ) { $processor->set_attribute( 'data-wp-interactive', true ); } $processor->set_attribute( 'data-wp-context---core-fit-text', 'core/fit-text::{"fontSize":""}' ); $processor->set_attribute( 'data-wp-init---core-fit-text', 'core/fit-text::callbacks.init' ); $processor->set_attribute( 'data-wp-style--font-size', 'core/fit-text::context.fontSize' ); $block_content = $processor->get_updated_html(); } } // fitText supersedes any other typography features return $block_content; } 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. * @phpstan-param array{ * coerce_to?: string, * root_size_value?: positive-int, * acceptable_units?: non-empty-array<non-empty-string>, * } $options * @phpstan-return array{ value: float, unit: non-empty-string }|null */ function wp_get_typography_value_and_unit( $raw_value, $options = array() ): ?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' ), ); /** * @var array{ * coerce_to: string, * root_size_value: positive-int, * acceptable_units: non-empty-array<non-empty-string>, * } $options */ $options = wp_parse_args( $options, $defaults ); // Bails out if the raw value can't be parsed. if ( ! preg_match( '/^(\d*\.?\d+)([a-zA-Z]+|%)$/', $raw_value, $matches ) ) { return null; } $value = (float) $matches[1]; $unit = $matches[2]; if ( ! in_array( $unit, $options['acceptable_units'], true ) ) { return null; } /* * 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. * @since 6.5.0 Returns early when min and max viewport subtraction is zero to avoid division by zero. * @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 = $args['maximum_viewport_width'] ?? null; $minimum_viewport_width_raw = $args['minimum_viewport_width'] ?? null; $maximum_font_size_raw = $args['maximum_font_size'] ?? null; $minimum_font_size_raw = $args['minimum_font_size'] ?? null; $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 = $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; } // Calculates the linear factor denominator. If it's 0, we cannot calculate a fluid value. $linear_factor_denominator = $maximum_viewport_width['value'] - $minimum_viewport_width['value']; if ( empty( $linear_factor_denominator ) ) { 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'] ) / ( $linear_factor_denominator ) ); $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. * @since 6.6.0 Deprecated bool argument $should_use_fluid_typography. * @since 6.7.0 Font size presets can enable fluid typography individually, even if it’s disabled globally. * * @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|array $settings Optional Theme JSON settings array that overrides any global theme settings. * 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, $settings = array() ) { if ( ! isset( $preset['size'] ) ) { return null; } /* * Catches falsy values and 0/'0'. Fluid calculations cannot be performed on `0`. * Also returns early when a preset font size explicitly disables fluid typography with `false`. */ $fluid_font_size_settings = $preset['fluid'] ?? null; if ( false === $fluid_font_size_settings || empty( $preset['size'] ) ) { return $preset['size']; } /* * As a boolean (deprecated since 6.6), $settings acts as an override to switch fluid typography "on" (`true`) or "off" (`false`). */ if ( is_bool( $settings ) ) { _deprecated_argument( __FUNCTION__, '6.6.0', __( '`boolean` type for second argument `$settings` is deprecated. Use `array()` instead.' ) ); $settings = array( 'typography' => array( 'fluid' => $settings, ), ); } // Fallback to global settings as default. $global_settings = wp_get_global_settings(); $settings = wp_parse_args( $settings, $global_settings ); $typography_settings = $settings['typography'] ?? array(); /* * Return early when fluid typography is disabled in the settings, and there * are no local settings to enable it for the individual preset. * * If this condition isn't met, either the settings or individual preset settings * have enabled fluid typography. */ if ( empty( $typography_settings['fluid'] ) && empty( $fluid_font_size_settings ) ) { return $preset['size']; } $fluid_settings = $typography_settings['fluid'] ?? array(); $layout_settings = $settings['layout'] ?? 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 = $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; // Try to grab explicit min and max fluid font sizes. $minimum_font_size_raw = $fluid_font_size_settings['min'] ?? null; $maximum_font_size_raw = $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 = clamp( 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', ) );