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730d9d4b49
This commit: * Adds default minimum font size limits so that min font size, where provided, does not become smaller than `14px`/`0.875rem`/`0.875em`. * For font sizes of `< 14px` that have no defined minimum sizes, uses the font size to set the floor of the `clamp()` value. This bugfix prevents converting existing small font sizes to clamp values that will reduce their font size even further in narrow widths. It therefore improves backward compatibility and accessibility. Original PR from Gutenberg repository: * [https://github.com/WordPress/gutenberg/pull/44993 #44993 Fluid typography: add font size constraints] Follow-up to [54260], [54360], [54497], [54500]. Props ramonopoly, andrewserong, isabel_brison, Joen, bernhard-reiter. See #56467. Built from https://develop.svn.wordpress.org/trunk@54646 git-svn-id: http://core.svn.wordpress.org/trunk@54198 1a063a9b-81f0-0310-95a4-ce76da25c4cd
585 lines
22 KiB
PHP
585 lines
22 KiB
PHP
<?php
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/**
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* Typography block support flag.
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*
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* @package WordPress
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* @since 5.6.0
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*/
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/**
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* Registers the style and typography block attributes for block types that support it.
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*
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* @since 5.6.0
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* @access private
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*
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* @param WP_Block_Type $block_type Block Type.
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*/
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function wp_register_typography_support( $block_type ) {
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if ( ! property_exists( $block_type, 'supports' ) ) {
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return;
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}
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$typography_supports = _wp_array_get( $block_type->supports, array( 'typography' ), false );
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if ( ! $typography_supports ) {
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return;
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}
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$has_font_family_support = _wp_array_get( $typography_supports, array( '__experimentalFontFamily' ), false );
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$has_font_size_support = _wp_array_get( $typography_supports, array( 'fontSize' ), false );
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$has_font_style_support = _wp_array_get( $typography_supports, array( '__experimentalFontStyle' ), false );
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$has_font_weight_support = _wp_array_get( $typography_supports, array( '__experimentalFontWeight' ), false );
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$has_letter_spacing_support = _wp_array_get( $typography_supports, array( '__experimentalLetterSpacing' ), false );
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$has_line_height_support = _wp_array_get( $typography_supports, array( 'lineHeight' ), false );
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$has_text_decoration_support = _wp_array_get( $typography_supports, array( '__experimentalTextDecoration' ), false );
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$has_text_transform_support = _wp_array_get( $typography_supports, array( '__experimentalTextTransform' ), false );
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$has_typography_support = $has_font_family_support
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|| $has_font_size_support
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|| $has_font_style_support
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|| $has_font_weight_support
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|| $has_letter_spacing_support
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|| $has_line_height_support
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|| $has_text_decoration_support
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|| $has_text_transform_support;
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if ( ! $block_type->attributes ) {
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$block_type->attributes = array();
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}
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if ( $has_typography_support && ! array_key_exists( 'style', $block_type->attributes ) ) {
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$block_type->attributes['style'] = array(
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'type' => 'object',
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);
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}
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if ( $has_font_size_support && ! array_key_exists( 'fontSize', $block_type->attributes ) ) {
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$block_type->attributes['fontSize'] = array(
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'type' => 'string',
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);
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}
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if ( $has_font_family_support && ! array_key_exists( 'fontFamily', $block_type->attributes ) ) {
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$block_type->attributes['fontFamily'] = array(
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'type' => 'string',
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);
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}
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}
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/**
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* Adds CSS classes and inline styles for typography features such as font sizes
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* to the incoming attributes array. This will be applied to the block markup in
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* the front-end.
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*
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* @since 5.6.0
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* @since 6.1.0 Used the style engine to generate CSS and classnames.
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* @access private
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*
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* @param WP_Block_Type $block_type Block type.
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* @param array $block_attributes Block attributes.
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* @return array Typography CSS classes and inline styles.
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*/
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function wp_apply_typography_support( $block_type, $block_attributes ) {
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if ( ! property_exists( $block_type, 'supports' ) ) {
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return array();
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}
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$typography_supports = _wp_array_get( $block_type->supports, array( 'typography' ), false );
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if ( ! $typography_supports ) {
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return array();
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}
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if ( wp_should_skip_block_supports_serialization( $block_type, 'typography' ) ) {
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return array();
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}
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$has_font_family_support = _wp_array_get( $typography_supports, array( '__experimentalFontFamily' ), false );
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$has_font_size_support = _wp_array_get( $typography_supports, array( 'fontSize' ), false );
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$has_font_style_support = _wp_array_get( $typography_supports, array( '__experimentalFontStyle' ), false );
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$has_font_weight_support = _wp_array_get( $typography_supports, array( '__experimentalFontWeight' ), false );
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$has_letter_spacing_support = _wp_array_get( $typography_supports, array( '__experimentalLetterSpacing' ), false );
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$has_line_height_support = _wp_array_get( $typography_supports, array( 'lineHeight' ), false );
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$has_text_decoration_support = _wp_array_get( $typography_supports, array( '__experimentalTextDecoration' ), false );
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$has_text_transform_support = _wp_array_get( $typography_supports, array( '__experimentalTextTransform' ), false );
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// Whether to skip individual block support features.
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$should_skip_font_size = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontSize' );
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$should_skip_font_family = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontFamily' );
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$should_skip_font_style = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontStyle' );
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$should_skip_font_weight = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontWeight' );
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$should_skip_line_height = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'lineHeight' );
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$should_skip_text_decoration = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textDecoration' );
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$should_skip_text_transform = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textTransform' );
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$should_skip_letter_spacing = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'letterSpacing' );
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$typography_block_styles = array();
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if ( $has_font_size_support && ! $should_skip_font_size ) {
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$preset_font_size = array_key_exists( 'fontSize', $block_attributes )
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? "var:preset|font-size|{$block_attributes['fontSize']}"
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: null;
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$custom_font_size = isset( $block_attributes['style']['typography']['fontSize'] )
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? $block_attributes['style']['typography']['fontSize']
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: null;
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$typography_block_styles['fontSize'] = $preset_font_size ? $preset_font_size : wp_get_typography_font_size_value(
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array(
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'size' => $custom_font_size,
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)
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);
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}
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if ( $has_font_family_support && ! $should_skip_font_family ) {
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$preset_font_family = array_key_exists( 'fontFamily', $block_attributes )
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? "var:preset|font-family|{$block_attributes['fontFamily']}"
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: null;
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$custom_font_family = isset( $block_attributes['style']['typography']['fontFamily'] )
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? wp_typography_get_preset_inline_style_value( $block_attributes['style']['typography']['fontFamily'], 'font-family' )
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: null;
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$typography_block_styles['fontFamily'] = $preset_font_family ? $preset_font_family : $custom_font_family;
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}
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if (
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$has_font_style_support &&
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! $should_skip_font_style &&
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isset( $block_attributes['style']['typography']['fontStyle'] )
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) {
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$typography_block_styles['fontStyle'] = wp_typography_get_preset_inline_style_value(
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$block_attributes['style']['typography']['fontStyle'],
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'font-style'
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);
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}
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if (
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$has_font_weight_support &&
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! $should_skip_font_weight &&
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isset( $block_attributes['style']['typography']['fontWeight'] )
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) {
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$typography_block_styles['fontWeight'] = wp_typography_get_preset_inline_style_value(
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$block_attributes['style']['typography']['fontWeight'],
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'font-weight'
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);
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}
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if ( $has_line_height_support && ! $should_skip_line_height ) {
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$typography_block_styles['lineHeight'] = _wp_array_get( $block_attributes, array( 'style', 'typography', 'lineHeight' ) );
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}
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if (
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$has_text_decoration_support &&
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! $should_skip_text_decoration &&
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isset( $block_attributes['style']['typography']['textDecoration'] )
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) {
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$typography_block_styles['textDecoration'] = wp_typography_get_preset_inline_style_value(
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$block_attributes['style']['typography']['textDecoration'],
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'text-decoration'
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);
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}
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if (
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$has_text_transform_support &&
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! $should_skip_text_transform &&
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isset( $block_attributes['style']['typography']['textTransform'] )
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) {
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$typography_block_styles['textTransform'] = wp_typography_get_preset_inline_style_value(
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$block_attributes['style']['typography']['textTransform'],
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'text-transform'
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);
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}
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if (
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$has_letter_spacing_support &&
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! $should_skip_letter_spacing &&
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isset( $block_attributes['style']['typography']['letterSpacing'] )
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) {
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$typography_block_styles['letterSpacing'] = wp_typography_get_preset_inline_style_value(
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$block_attributes['style']['typography']['letterSpacing'],
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'letter-spacing'
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);
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}
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$attributes = array();
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$styles = wp_style_engine_get_styles(
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array( 'typography' => $typography_block_styles ),
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array( 'convert_vars_to_classnames' => true )
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);
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if ( ! empty( $styles['classnames'] ) ) {
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$attributes['class'] = $styles['classnames'];
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}
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if ( ! empty( $styles['css'] ) ) {
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$attributes['style'] = $styles['css'];
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}
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return $attributes;
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}
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/**
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* Generates an inline style value for a typography feature e.g. text decoration,
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* text transform, and font style.
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*
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* Note: This function is for backwards compatibility.
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* * It is necessary to parse older blocks whose typography styles contain presets.
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* * It mostly replaces the deprecated `wp_typography_get_css_variable_inline_style()`,
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* but skips compiling a CSS declaration as the style engine takes over this role.
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* @link https://github.com/wordpress/gutenberg/pull/27555
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*
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* @since 6.1.0
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*
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* @param string $style_value A raw style value for a single typography feature from a block's style attribute.
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* @param string $css_property Slug for the CSS property the inline style sets.
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* @return string A CSS inline style value.
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*/
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function wp_typography_get_preset_inline_style_value( $style_value, $css_property ) {
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// If the style value is not a preset CSS variable go no further.
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if ( empty( $style_value ) || ! str_contains( $style_value, "var:preset|{$css_property}|" ) ) {
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return $style_value;
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}
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/*
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* For backwards compatibility.
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* Presets were removed in WordPress/gutenberg#27555.
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* A preset CSS variable is the style.
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* Gets the style value from the string and return CSS style.
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*/
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$index_to_splice = strrpos( $style_value, '|' ) + 1;
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$slug = _wp_to_kebab_case( substr( $style_value, $index_to_splice ) );
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// Return the actual CSS inline style value,
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// e.g. `var(--wp--preset--text-decoration--underline);`.
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return sprintf( 'var(--wp--preset--%s--%s);', $css_property, $slug );
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}
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/**
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* Renders typography styles/content to the block wrapper.
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*
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* @since 6.1.0
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*
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* @param string $block_content Rendered block content.
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* @param array $block Block object.
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* @return string Filtered block content.
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*/
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function wp_render_typography_support( $block_content, $block ) {
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if ( ! isset( $block['attrs']['style']['typography']['fontSize'] ) ) {
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return $block_content;
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}
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$custom_font_size = $block['attrs']['style']['typography']['fontSize'];
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$fluid_font_size = wp_get_typography_font_size_value( array( 'size' => $custom_font_size ) );
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/*
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* Checks that $fluid_font_size does not match $custom_font_size,
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* which means it's been mutated by the fluid font size functions.
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*/
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if ( ! empty( $fluid_font_size ) && $fluid_font_size !== $custom_font_size ) {
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// Replaces the first instance of `font-size:$custom_font_size` with `font-size:$fluid_font_size`.
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return preg_replace( '/font-size\s*:\s*' . preg_quote( $custom_font_size, '/' ) . '\s*;?/', 'font-size:' . esc_attr( $fluid_font_size ) . ';', $block_content, 1 );
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}
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return $block_content;
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}
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/**
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* Checks a string for a unit and value and returns an array
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* consisting of `'value'` and `'unit'`, e.g. array( '42', 'rem' ).
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*
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* @since 6.1.0
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*
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* @param string|int|float $raw_value Raw size value from theme.json.
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* @param array $options {
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* Optional. An associative array of options. Default is empty array.
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*
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* @type string $coerce_to Coerce the value to rem or px. Default `'rem'`.
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* @type int $root_size_value Value of root font size for rem|em <-> px conversion. Default `16`.
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* @type string[] $acceptable_units An array of font size units. Default `array( 'rem', 'px', 'em' )`;
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* }
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* @return array|null An array consisting of `'value'` and `'unit'` properties on success.
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* `null` on failure.
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*/
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function wp_get_typography_value_and_unit( $raw_value, $options = array() ) {
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if ( ! is_string( $raw_value ) && ! is_int( $raw_value ) && ! is_float( $raw_value ) ) {
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_doing_it_wrong(
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__FUNCTION__,
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__( 'Raw size value must be a string, integer, or float.' ),
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'6.1.0'
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);
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return null;
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}
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if ( empty( $raw_value ) ) {
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return null;
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}
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// Converts numbers to pixel values by default.
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if ( is_numeric( $raw_value ) ) {
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$raw_value = $raw_value . 'px';
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}
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$defaults = array(
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'coerce_to' => '',
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'root_size_value' => 16,
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'acceptable_units' => array( 'rem', 'px', 'em' ),
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);
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$options = wp_parse_args( $options, $defaults );
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$acceptable_units_group = implode( '|', $options['acceptable_units'] );
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$pattern = '/^(\d*\.?\d+)(' . $acceptable_units_group . '){1,1}$/';
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preg_match( $pattern, $raw_value, $matches );
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// Bails out if not a number value and a px or rem unit.
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if ( ! isset( $matches[1] ) || ! isset( $matches[2] ) ) {
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return null;
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}
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$value = $matches[1];
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$unit = $matches[2];
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/*
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* Default browser font size. Later, possibly could inject some JS to
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* compute this `getComputedStyle( document.querySelector( "html" ) ).fontSize`.
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*/
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if ( 'px' === $options['coerce_to'] && ( 'em' === $unit || 'rem' === $unit ) ) {
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$value = $value * $options['root_size_value'];
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$unit = $options['coerce_to'];
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}
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if ( 'px' === $unit && ( 'em' === $options['coerce_to'] || 'rem' === $options['coerce_to'] ) ) {
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$value = $value / $options['root_size_value'];
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$unit = $options['coerce_to'];
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}
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/*
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* No calculation is required if swapping between em and rem yet,
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* since we assume a root size value. Later we might like to differentiate between
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* :root font size (rem) and parent element font size (em) relativity.
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*/
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if ( ( 'em' === $options['coerce_to'] || 'rem' === $options['coerce_to'] ) && ( 'em' === $unit || 'rem' === $unit ) ) {
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$unit = $options['coerce_to'];
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}
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return array(
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'value' => round( $value, 3 ),
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'unit' => $unit,
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);
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}
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/**
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* Internal implementation of CSS clamp() based on available min/max viewport
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* width and min/max font sizes.
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*
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* @since 6.1.0
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* @access private
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*
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* @param array $args {
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* Optional. An associative array of values to calculate a fluid formula
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* for font size. Default is empty array.
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*
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* @type string $maximum_viewport_width Maximum size up to which type will have fluidity.
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* @type string $minimum_viewport_width Minimum viewport size from which type will have fluidity.
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* @type string $maximum_font_size Maximum font size for any clamp() calculation.
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* @type string $minimum_font_size Minimum font size for any clamp() calculation.
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* @type int $scale_factor A scale factor to determine how fast a font scales within boundaries.
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* }
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* @return string|null A font-size value using clamp() on success, otherwise null.
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*/
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function wp_get_computed_fluid_typography_value( $args = array() ) {
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$maximum_viewport_width_raw = isset( $args['maximum_viewport_width'] ) ? $args['maximum_viewport_width'] : null;
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$minimum_viewport_width_raw = isset( $args['minimum_viewport_width'] ) ? $args['minimum_viewport_width'] : null;
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$maximum_font_size_raw = isset( $args['maximum_font_size'] ) ? $args['maximum_font_size'] : null;
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$minimum_font_size_raw = isset( $args['minimum_font_size'] ) ? $args['minimum_font_size'] : null;
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$scale_factor = isset( $args['scale_factor'] ) ? $args['scale_factor'] : null;
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// Normalizes the minimum font size in order to use the value for calculations.
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$minimum_font_size = wp_get_typography_value_and_unit( $minimum_font_size_raw );
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/*
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* We get a 'preferred' unit to keep units consistent when calculating,
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* otherwise the result will not be accurate.
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*/
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$font_size_unit = isset( $minimum_font_size['unit'] ) ? $minimum_font_size['unit'] : 'rem';
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// Normalizes the maximum font size in order to use the value for calculations.
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$maximum_font_size = wp_get_typography_value_and_unit(
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$maximum_font_size_raw,
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array(
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'coerce_to' => $font_size_unit,
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)
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);
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// Checks for mandatory min and max sizes, and protects against unsupported units.
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if ( ! $maximum_font_size || ! $minimum_font_size ) {
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return null;
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}
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// 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,
|
|
)
|
|
);
|
|
|
|
/*
|
|
* 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
|
|
*
|
|
* @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.
|
|
$typography_settings = wp_get_global_settings( array( 'typography' ) );
|
|
$should_use_fluid_typography = isset( $typography_settings['fluid'] ) && true === $typography_settings['fluid'] ? true : $should_use_fluid_typography;
|
|
|
|
if ( ! $should_use_fluid_typography ) {
|
|
return $preset['size'];
|
|
}
|
|
|
|
// Defaults.
|
|
$default_maximum_viewport_width = '1600px';
|
|
$default_minimum_viewport_width = '768px';
|
|
$default_minimum_font_size_factor = 0.75;
|
|
$default_maximum_font_size_factor = 1.5;
|
|
$default_scale_factor = 1;
|
|
$default_minimum_font_size_limit = '14px';
|
|
|
|
// 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'] );
|
|
|
|
// Protect against unsupported units.
|
|
if ( empty( $preferred_size['unit'] ) ) {
|
|
return $preset['size'];
|
|
}
|
|
|
|
// If no fluid max font size is available, create one using max font size factor.
|
|
if ( ! $maximum_font_size_raw ) {
|
|
$maximum_font_size_raw = round( $preferred_size['value'] * $default_maximum_font_size_factor, 3 ) . $preferred_size['unit'];
|
|
}
|
|
|
|
// If no fluid min font size is available, create one using min font size factor.
|
|
if ( ! $minimum_font_size_raw ) {
|
|
$minimum_font_size_raw = round( $preferred_size['value'] * $default_minimum_font_size_factor, 3 ) . $preferred_size['unit'];
|
|
}
|
|
|
|
// Normalizes the minimum font size limit according to the incoming unit, so we can perform checks using it.
|
|
$minimum_font_size_limit = wp_get_typography_value_and_unit(
|
|
$default_minimum_font_size_limit,
|
|
array(
|
|
'coerce_to' => $preferred_size['unit'],
|
|
)
|
|
);
|
|
|
|
if ( ! empty( $minimum_font_size_limit ) ) {
|
|
/*
|
|
* If a minimum size was not passed to this function
|
|
* and the user-defined font size is lower than $minimum_font_size_limit,
|
|
* then use the user-defined font size as the minimum font-size.
|
|
*/
|
|
if ( ! isset( $fluid_font_size_settings['min'] ) && $preferred_size['value'] < $minimum_font_size_limit['value'] ) {
|
|
$minimum_font_size_raw = implode( '', $preferred_size );
|
|
} else {
|
|
$minimum_font_size_parsed = wp_get_typography_value_and_unit(
|
|
$minimum_font_size_raw,
|
|
array(
|
|
'coerce_to' => $preferred_size['unit'],
|
|
)
|
|
);
|
|
|
|
/*
|
|
* If the passed or calculated minimum font size is lower than $minimum_font_size_limit
|
|
* use $minimum_font_size_limit instead.
|
|
*/
|
|
if ( ! empty( $minimum_font_size_parsed ) && $minimum_font_size_parsed['value'] < $minimum_font_size_limit['value'] ) {
|
|
$minimum_font_size_raw = implode( '', $minimum_font_size_limit );
|
|
}
|
|
}
|
|
}
|
|
|
|
$fluid_font_size_value = wp_get_computed_fluid_typography_value(
|
|
array(
|
|
'minimum_viewport_width' => $default_minimum_viewport_width,
|
|
'maximum_viewport_width' => $default_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',
|
|
)
|
|
);
|