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1 <?php 2 /** 3 * Typography block support flag. 4 * 5 * @package WordPress 6 * @since 5.6.0 7 */ 8 9 /** 10 * Registers the style and typography block attributes for block types that support it. 11 * 12 * @since 5.6.0 13 * @since 6.3.0 Added support for text-columns. 14 * @access private 15 * 16 * @param WP_Block_Type $block_type Block Type. 17 */ 18 function wp_register_typography_support( $block_type ) { 19 if ( ! ( $block_type instanceof WP_Block_Type ) ) { 20 return; 21 } 22 23 $typography_supports = isset( $block_type->supports['typography'] ) ? $block_type->supports['typography'] : false; 24 if ( ! $typography_supports ) { 25 return; 26 } 27 28 $has_font_family_support = isset( $typography_supports['__experimentalFontFamily'] ) ? $typography_supports['__experimentalFontFamily'] : false; 29 $has_font_size_support = isset( $typography_supports['fontSize'] ) ? $typography_supports['fontSize'] : false; 30 $has_font_style_support = isset( $typography_supports['__experimentalFontStyle'] ) ? $typography_supports['__experimentalFontStyle'] : false; 31 $has_font_weight_support = isset( $typography_supports['__experimentalFontWeight'] ) ? $typography_supports['__experimentalFontWeight'] : false; 32 $has_letter_spacing_support = isset( $typography_supports['__experimentalLetterSpacing'] ) ? $typography_supports['__experimentalLetterSpacing'] : false; 33 $has_line_height_support = isset( $typography_supports['lineHeight'] ) ? $typography_supports['lineHeight'] : false; 34 $has_text_columns_support = isset( $typography_supports['textColumns'] ) ? $typography_supports['textColumns'] : false; 35 $has_text_decoration_support = isset( $typography_supports['__experimentalTextDecoration'] ) ? $typography_supports['__experimentalTextDecoration'] : false; 36 $has_text_transform_support = isset( $typography_supports['__experimentalTextTransform'] ) ? $typography_supports['__experimentalTextTransform'] : false; 37 $has_writing_mode_support = isset( $typography_supports['__experimentalWritingMode'] ) ? $typography_supports['__experimentalWritingMode'] : false; 38 39 $has_typography_support = $has_font_family_support 40 || $has_font_size_support 41 || $has_font_style_support 42 || $has_font_weight_support 43 || $has_letter_spacing_support 44 || $has_line_height_support 45 || $has_text_columns_support 46 || $has_text_decoration_support 47 || $has_text_transform_support 48 || $has_writing_mode_support; 49 50 if ( ! $block_type->attributes ) { 51 $block_type->attributes = array(); 52 } 53 54 if ( $has_typography_support && ! array_key_exists( 'style', $block_type->attributes ) ) { 55 $block_type->attributes['style'] = array( 56 'type' => 'object', 57 ); 58 } 59 60 if ( $has_font_size_support && ! array_key_exists( 'fontSize', $block_type->attributes ) ) { 61 $block_type->attributes['fontSize'] = array( 62 'type' => 'string', 63 ); 64 } 65 66 if ( $has_font_family_support && ! array_key_exists( 'fontFamily', $block_type->attributes ) ) { 67 $block_type->attributes['fontFamily'] = array( 68 'type' => 'string', 69 ); 70 } 71 } 72 73 /** 74 * Adds CSS classes and inline styles for typography features such as font sizes 75 * to the incoming attributes array. This will be applied to the block markup in 76 * the front-end. 77 * 78 * @since 5.6.0 79 * @since 6.1.0 Used the style engine to generate CSS and classnames. 80 * @since 6.3.0 Added support for text-columns. 81 * @access private 82 * 83 * @param WP_Block_Type $block_type Block type. 84 * @param array $block_attributes Block attributes. 85 * @return array Typography CSS classes and inline styles. 86 */ 87 function wp_apply_typography_support( $block_type, $block_attributes ) { 88 if ( ! ( $block_type instanceof WP_Block_Type ) ) { 89 return array(); 90 } 91 92 $typography_supports = isset( $block_type->supports['typography'] ) 93 ? $block_type->supports['typography'] 94 : false; 95 if ( ! $typography_supports ) { 96 return array(); 97 } 98 99 if ( wp_should_skip_block_supports_serialization( $block_type, 'typography' ) ) { 100 return array(); 101 } 102 103 $has_font_family_support = isset( $typography_supports['__experimentalFontFamily'] ) ? $typography_supports['__experimentalFontFamily'] : false; 104 $has_font_size_support = isset( $typography_supports['fontSize'] ) ? $typography_supports['fontSize'] : false; 105 $has_font_style_support = isset( $typography_supports['__experimentalFontStyle'] ) ? $typography_supports['__experimentalFontStyle'] : false; 106 $has_font_weight_support = isset( $typography_supports['__experimentalFontWeight'] ) ? $typography_supports['__experimentalFontWeight'] : false; 107 $has_letter_spacing_support = isset( $typography_supports['__experimentalLetterSpacing'] ) ? $typography_supports['__experimentalLetterSpacing'] : false; 108 $has_line_height_support = isset( $typography_supports['lineHeight'] ) ? $typography_supports['lineHeight'] : false; 109 $has_text_columns_support = isset( $typography_supports['textColumns'] ) ? $typography_supports['textColumns'] : false; 110 $has_text_decoration_support = isset( $typography_supports['__experimentalTextDecoration'] ) ? $typography_supports['__experimentalTextDecoration'] : false; 111 $has_text_transform_support = isset( $typography_supports['__experimentalTextTransform'] ) ? $typography_supports['__experimentalTextTransform'] : false; 112 $has_writing_mode_support = isset( $typography_supports['__experimentalWritingMode'] ) ? $typography_supports['__experimentalWritingMode'] : false; 113 114 // Whether to skip individual block support features. 115 $should_skip_font_size = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontSize' ); 116 $should_skip_font_family = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontFamily' ); 117 $should_skip_font_style = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontStyle' ); 118 $should_skip_font_weight = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontWeight' ); 119 $should_skip_line_height = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'lineHeight' ); 120 $should_skip_text_columns = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textColumns' ); 121 $should_skip_text_decoration = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textDecoration' ); 122 $should_skip_text_transform = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textTransform' ); 123 $should_skip_letter_spacing = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'letterSpacing' ); 124 $should_skip_writing_mode = wp_should_skip_block_supports_serialization( $block_type, 'typography', 'writingMode' ); 125 126 $typography_block_styles = array(); 127 if ( $has_font_size_support && ! $should_skip_font_size ) { 128 $preset_font_size = array_key_exists( 'fontSize', $block_attributes ) 129 ? "var:preset|font-size|{$block_attributes['fontSize']}" 130 : null; 131 $custom_font_size = isset( $block_attributes['style']['typography']['fontSize'] ) 132 ? $block_attributes['style']['typography']['fontSize'] 133 : null; 134 $typography_block_styles['fontSize'] = $preset_font_size ? $preset_font_size : wp_get_typography_font_size_value( 135 array( 136 'size' => $custom_font_size, 137 ) 138 ); 139 } 140 141 if ( $has_font_family_support && ! $should_skip_font_family ) { 142 $preset_font_family = array_key_exists( 'fontFamily', $block_attributes ) 143 ? "var:preset|font-family|{$block_attributes['fontFamily']}" 144 : null; 145 $custom_font_family = isset( $block_attributes['style']['typography']['fontFamily'] ) 146 ? wp_typography_get_preset_inline_style_value( $block_attributes['style']['typography']['fontFamily'], 'font-family' ) 147 : null; 148 $typography_block_styles['fontFamily'] = $preset_font_family ? $preset_font_family : $custom_font_family; 149 } 150 151 if ( 152 $has_font_style_support && 153 ! $should_skip_font_style && 154 isset( $block_attributes['style']['typography']['fontStyle'] ) 155 ) { 156 $typography_block_styles['fontStyle'] = wp_typography_get_preset_inline_style_value( 157 $block_attributes['style']['typography']['fontStyle'], 158 'font-style' 159 ); 160 } 161 162 if ( 163 $has_font_weight_support && 164 ! $should_skip_font_weight && 165 isset( $block_attributes['style']['typography']['fontWeight'] ) 166 ) { 167 $typography_block_styles['fontWeight'] = wp_typography_get_preset_inline_style_value( 168 $block_attributes['style']['typography']['fontWeight'], 169 'font-weight' 170 ); 171 } 172 173 if ( $has_line_height_support && ! $should_skip_line_height ) { 174 $typography_block_styles['lineHeight'] = isset( $block_attributes['style']['typography']['lineHeight'] ) 175 ? $block_attributes['style']['typography']['lineHeight'] 176 : null; 177 } 178 179 if ( $has_text_columns_support && ! $should_skip_text_columns && isset( $block_attributes['style']['typography']['textColumns'] ) ) { 180 $typography_block_styles['textColumns'] = isset( $block_attributes['style']['typography']['textColumns'] ) 181 ? $block_attributes['style']['typography']['textColumns'] 182 : null; 183 } 184 185 if ( 186 $has_text_decoration_support && 187 ! $should_skip_text_decoration && 188 isset( $block_attributes['style']['typography']['textDecoration'] ) 189 ) { 190 $typography_block_styles['textDecoration'] = wp_typography_get_preset_inline_style_value( 191 $block_attributes['style']['typography']['textDecoration'], 192 'text-decoration' 193 ); 194 } 195 196 if ( 197 $has_text_transform_support && 198 ! $should_skip_text_transform && 199 isset( $block_attributes['style']['typography']['textTransform'] ) 200 ) { 201 $typography_block_styles['textTransform'] = wp_typography_get_preset_inline_style_value( 202 $block_attributes['style']['typography']['textTransform'], 203 'text-transform' 204 ); 205 } 206 207 if ( 208 $has_letter_spacing_support && 209 ! $should_skip_letter_spacing && 210 isset( $block_attributes['style']['typography']['letterSpacing'] ) 211 ) { 212 $typography_block_styles['letterSpacing'] = wp_typography_get_preset_inline_style_value( 213 $block_attributes['style']['typography']['letterSpacing'], 214 'letter-spacing' 215 ); 216 } 217 218 if ( $has_writing_mode_support && 219 ! $should_skip_writing_mode && 220 isset( $block_attributes['style']['typography']['writingMode'] ) 221 ) { 222 $typography_block_styles['writingMode'] = isset( $block_attributes['style']['typography']['writingMode'] ) 223 ? $block_attributes['style']['typography']['writingMode'] 224 : null; 225 } 226 227 $attributes = array(); 228 $styles = wp_style_engine_get_styles( 229 array( 'typography' => $typography_block_styles ), 230 array( 'convert_vars_to_classnames' => true ) 231 ); 232 233 if ( ! empty( $styles['classnames'] ) ) { 234 $attributes['class'] = $styles['classnames']; 235 } 236 237 if ( ! empty( $styles['css'] ) ) { 238 $attributes['style'] = $styles['css']; 239 } 240 241 return $attributes; 242 } 243 244 /** 245 * Generates an inline style value for a typography feature e.g. text decoration, 246 * text transform, and font style. 247 * 248 * Note: This function is for backwards compatibility. 249 * * It is necessary to parse older blocks whose typography styles contain presets. 250 * * It mostly replaces the deprecated `wp_typography_get_css_variable_inline_style()`, 251 * but skips compiling a CSS declaration as the style engine takes over this role. 252 * @link https://github.com/wordpress/gutenberg/pull/27555 253 * 254 * @since 6.1.0 255 * 256 * @param string $style_value A raw style value for a single typography feature from a block's style attribute. 257 * @param string $css_property Slug for the CSS property the inline style sets. 258 * @return string A CSS inline style value. 259 */ 260 function wp_typography_get_preset_inline_style_value( $style_value, $css_property ) { 261 // If the style value is not a preset CSS variable go no further. 262 if ( empty( $style_value ) || ! str_contains( $style_value, "var:preset|{$css_property}|" ) ) { 263 return $style_value; 264 } 265 266 /* 267 * For backwards compatibility. 268 * Presets were removed in WordPress/gutenberg#27555. 269 * A preset CSS variable is the style. 270 * Gets the style value from the string and return CSS style. 271 */ 272 $index_to_splice = strrpos( $style_value, '|' ) + 1; 273 $slug = _wp_to_kebab_case( substr( $style_value, $index_to_splice ) ); 274 275 // Return the actual CSS inline style value, 276 // e.g. `var(--wp--preset--text-decoration--underline);`. 277 return sprintf( 'var(--wp--preset--%s--%s);', $css_property, $slug ); 278 } 279 280 /** 281 * Renders typography styles/content to the block wrapper. 282 * 283 * @since 6.1.0 284 * 285 * @param string $block_content Rendered block content. 286 * @param array $block Block object. 287 * @return string Filtered block content. 288 */ 289 function wp_render_typography_support( $block_content, $block ) { 290 if ( ! isset( $block['attrs']['style']['typography']['fontSize'] ) ) { 291 return $block_content; 292 } 293 294 $custom_font_size = $block['attrs']['style']['typography']['fontSize']; 295 $fluid_font_size = wp_get_typography_font_size_value( array( 'size' => $custom_font_size ) ); 296 297 /* 298 * Checks that $fluid_font_size does not match $custom_font_size, 299 * which means it's been mutated by the fluid font size functions. 300 */ 301 if ( ! empty( $fluid_font_size ) && $fluid_font_size !== $custom_font_size ) { 302 // Replaces the first instance of `font-size:$custom_font_size` with `font-size:$fluid_font_size`. 303 return preg_replace( '/font-size\s*:\s*' . preg_quote( $custom_font_size, '/' ) . '\s*;?/', 'font-size:' . esc_attr( $fluid_font_size ) . ';', $block_content, 1 ); 304 } 305 306 return $block_content; 307 } 308 309 /** 310 * Checks a string for a unit and value and returns an array 311 * consisting of `'value'` and `'unit'`, e.g. array( '42', 'rem' ). 312 * 313 * @since 6.1.0 314 * 315 * @param string|int|float $raw_value Raw size value from theme.json. 316 * @param array $options { 317 * Optional. An associative array of options. Default is empty array. 318 * 319 * @type string $coerce_to Coerce the value to rem or px. Default `'rem'`. 320 * @type int $root_size_value Value of root font size for rem|em <-> px conversion. Default `16`. 321 * @type string[] $acceptable_units An array of font size units. Default `array( 'rem', 'px', 'em' )`; 322 * } 323 * @return array|null An array consisting of `'value'` and `'unit'` properties on success. 324 * `null` on failure. 325 */ 326 function wp_get_typography_value_and_unit( $raw_value, $options = array() ) { 327 if ( ! is_string( $raw_value ) && ! is_int( $raw_value ) && ! is_float( $raw_value ) ) { 328 _doing_it_wrong( 329 __FUNCTION__, 330 __( 'Raw size value must be a string, integer, or float.' ), 331 '6.1.0' 332 ); 333 return null; 334 } 335 336 if ( empty( $raw_value ) ) { 337 return null; 338 } 339 340 // Converts numbers to pixel values by default. 341 if ( is_numeric( $raw_value ) ) { 342 $raw_value = $raw_value . 'px'; 343 } 344 345 $defaults = array( 346 'coerce_to' => '', 347 'root_size_value' => 16, 348 'acceptable_units' => array( 'rem', 'px', 'em' ), 349 ); 350 351 $options = wp_parse_args( $options, $defaults ); 352 353 $acceptable_units_group = implode( '|', $options['acceptable_units'] ); 354 $pattern = '/^(\d*\.?\d+)(' . $acceptable_units_group . '){1,1}$/'; 355 356 preg_match( $pattern, $raw_value, $matches ); 357 358 // Bails out if not a number value and a px or rem unit. 359 if ( ! isset( $matches[1] ) || ! isset( $matches[2] ) ) { 360 return null; 361 } 362 363 $value = $matches[1]; 364 $unit = $matches[2]; 365 366 /* 367 * Default browser font size. Later, possibly could inject some JS to 368 * compute this `getComputedStyle( document.querySelector( "html" ) ).fontSize`. 369 */ 370 if ( 'px' === $options['coerce_to'] && ( 'em' === $unit || 'rem' === $unit ) ) { 371 $value = $value * $options['root_size_value']; 372 $unit = $options['coerce_to']; 373 } 374 375 if ( 'px' === $unit && ( 'em' === $options['coerce_to'] || 'rem' === $options['coerce_to'] ) ) { 376 $value = $value / $options['root_size_value']; 377 $unit = $options['coerce_to']; 378 } 379 380 /* 381 * No calculation is required if swapping between em and rem yet, 382 * since we assume a root size value. Later we might like to differentiate between 383 * :root font size (rem) and parent element font size (em) relativity. 384 */ 385 if ( ( 'em' === $options['coerce_to'] || 'rem' === $options['coerce_to'] ) && ( 'em' === $unit || 'rem' === $unit ) ) { 386 $unit = $options['coerce_to']; 387 } 388 389 return array( 390 'value' => round( $value, 3 ), 391 'unit' => $unit, 392 ); 393 } 394 395 /** 396 * Internal implementation of CSS clamp() based on available min/max viewport 397 * width and min/max font sizes. 398 * 399 * @since 6.1.0 400 * @since 6.3.0 Checks for unsupported min/max viewport values that cause invalid clamp values. 401 * @since 6.5.0 Returns early when min and max viewport subtraction is zero to avoid division by zero. 402 * @access private 403 * 404 * @param array $args { 405 * Optional. An associative array of values to calculate a fluid formula 406 * for font size. Default is empty array. 407 * 408 * @type string $maximum_viewport_width Maximum size up to which type will have fluidity. 409 * @type string $minimum_viewport_width Minimum viewport size from which type will have fluidity. 410 * @type string $maximum_font_size Maximum font size for any clamp() calculation. 411 * @type string $minimum_font_size Minimum font size for any clamp() calculation. 412 * @type int $scale_factor A scale factor to determine how fast a font scales within boundaries. 413 * } 414 * @return string|null A font-size value using clamp() on success, otherwise null. 415 */ 416 function wp_get_computed_fluid_typography_value( $args = array() ) { 417 $maximum_viewport_width_raw = isset( $args['maximum_viewport_width'] ) ? $args['maximum_viewport_width'] : null; 418 $minimum_viewport_width_raw = isset( $args['minimum_viewport_width'] ) ? $args['minimum_viewport_width'] : null; 419 $maximum_font_size_raw = isset( $args['maximum_font_size'] ) ? $args['maximum_font_size'] : null; 420 $minimum_font_size_raw = isset( $args['minimum_font_size'] ) ? $args['minimum_font_size'] : null; 421 $scale_factor = isset( $args['scale_factor'] ) ? $args['scale_factor'] : null; 422 423 // Normalizes the minimum font size in order to use the value for calculations. 424 $minimum_font_size = wp_get_typography_value_and_unit( $minimum_font_size_raw ); 425 426 /* 427 * We get a 'preferred' unit to keep units consistent when calculating, 428 * otherwise the result will not be accurate. 429 */ 430 $font_size_unit = isset( $minimum_font_size['unit'] ) ? $minimum_font_size['unit'] : 'rem'; 431 432 // Normalizes the maximum font size in order to use the value for calculations. 433 $maximum_font_size = wp_get_typography_value_and_unit( 434 $maximum_font_size_raw, 435 array( 436 'coerce_to' => $font_size_unit, 437 ) 438 ); 439 440 // Checks for mandatory min and max sizes, and protects against unsupported units. 441 if ( ! $maximum_font_size || ! $minimum_font_size ) { 442 return null; 443 } 444 445 // Uses rem for accessible fluid target font scaling. 446 $minimum_font_size_rem = wp_get_typography_value_and_unit( 447 $minimum_font_size_raw, 448 array( 449 'coerce_to' => 'rem', 450 ) 451 ); 452 453 // Viewport widths defined for fluid typography. Normalize units. 454 $maximum_viewport_width = wp_get_typography_value_and_unit( 455 $maximum_viewport_width_raw, 456 array( 457 'coerce_to' => $font_size_unit, 458 ) 459 ); 460 $minimum_viewport_width = wp_get_typography_value_and_unit( 461 $minimum_viewport_width_raw, 462 array( 463 'coerce_to' => $font_size_unit, 464 ) 465 ); 466 467 // Protects against unsupported units in min and max viewport widths. 468 if ( ! $minimum_viewport_width || ! $maximum_viewport_width ) { 469 return null; 470 } 471 472 // Calculates the linear factor denominator. If it's 0, we cannot calculate a fluid value. 473 $linear_factor_denominator = $maximum_viewport_width['value'] - $minimum_viewport_width['value']; 474 if ( empty( $linear_factor_denominator ) ) { 475 return null; 476 } 477 478 /* 479 * Build CSS rule. 480 * Borrowed from https://websemantics.uk/tools/responsive-font-calculator/. 481 */ 482 $view_port_width_offset = round( $minimum_viewport_width['value'] / 100, 3 ) . $font_size_unit; 483 $linear_factor = 100 * ( ( $maximum_font_size['value'] - $minimum_font_size['value'] ) / ( $linear_factor_denominator ) ); 484 $linear_factor_scaled = round( $linear_factor * $scale_factor, 3 ); 485 $linear_factor_scaled = empty( $linear_factor_scaled ) ? 1 : $linear_factor_scaled; 486 $fluid_target_font_size = implode( '', $minimum_font_size_rem ) . " + ((1vw - $view_port_width_offset) * $linear_factor_scaled)"; 487 488 return "clamp($minimum_font_size_raw, $fluid_target_font_size, $maximum_font_size_raw)"; 489 } 490 491 /** 492 * Returns a font-size value based on a given font-size preset. 493 * Takes into account fluid typography parameters and attempts to return a CSS 494 * formula depending on available, valid values. 495 * 496 * @since 6.1.0 497 * @since 6.1.1 Adjusted rules for min and max font sizes. 498 * @since 6.2.0 Added 'settings.typography.fluid.minFontSize' support. 499 * @since 6.3.0 Using layout.wideSize as max viewport width, and logarithmic scale factor to calculate minimum font scale. 500 * @since 6.4.0 Added configurable min and max viewport width values to the typography.fluid theme.json schema. 501 * 502 * @param array $preset { 503 * Required. fontSizes preset value as seen in theme.json. 504 * 505 * @type string $name Name of the font size preset. 506 * @type string $slug Kebab-case, unique identifier for the font size preset. 507 * @type string|int|float $size CSS font-size value, including units if applicable. 508 * } 509 * @param bool $should_use_fluid_typography An override to switch fluid typography "on". Can be used for unit testing. 510 * Default is false. 511 * @return string|null Font-size value or null if a size is not passed in $preset. 512 */ 513 function wp_get_typography_font_size_value( $preset, $should_use_fluid_typography = false ) { 514 if ( ! isset( $preset['size'] ) ) { 515 return null; 516 } 517 518 /* 519 * Catches empty values and 0/'0'. 520 * Fluid calculations cannot be performed on 0. 521 */ 522 if ( empty( $preset['size'] ) ) { 523 return $preset['size']; 524 } 525 526 // Checks if fluid font sizes are activated. 527 $global_settings = wp_get_global_settings(); 528 $typography_settings = isset( $global_settings['typography'] ) ? $global_settings['typography'] : array(); 529 $layout_settings = isset( $global_settings['layout'] ) ? $global_settings['layout'] : array(); 530 531 if ( 532 isset( $typography_settings['fluid'] ) && 533 ( true === $typography_settings['fluid'] || is_array( $typography_settings['fluid'] ) ) 534 ) { 535 $should_use_fluid_typography = true; 536 } 537 538 if ( ! $should_use_fluid_typography ) { 539 return $preset['size']; 540 } 541 542 $fluid_settings = isset( $typography_settings['fluid'] ) && is_array( $typography_settings['fluid'] ) 543 ? $typography_settings['fluid'] 544 : array(); 545 546 // Defaults. 547 $default_maximum_viewport_width = '1600px'; 548 $default_minimum_viewport_width = '320px'; 549 $default_minimum_font_size_factor_max = 0.75; 550 $default_minimum_font_size_factor_min = 0.25; 551 $default_scale_factor = 1; 552 $default_minimum_font_size_limit = '14px'; 553 554 // Defaults overrides. 555 $minimum_viewport_width = isset( $fluid_settings['minViewportWidth'] ) ? $fluid_settings['minViewportWidth'] : $default_minimum_viewport_width; 556 $maximum_viewport_width = isset( $layout_settings['wideSize'] ) && ! empty( wp_get_typography_value_and_unit( $layout_settings['wideSize'] ) ) ? $layout_settings['wideSize'] : $default_maximum_viewport_width; 557 if ( isset( $fluid_settings['maxViewportWidth'] ) ) { 558 $maximum_viewport_width = $fluid_settings['maxViewportWidth']; 559 } 560 $has_min_font_size = isset( $fluid_settings['minFontSize'] ) && ! empty( wp_get_typography_value_and_unit( $fluid_settings['minFontSize'] ) ); 561 $minimum_font_size_limit = $has_min_font_size ? $fluid_settings['minFontSize'] : $default_minimum_font_size_limit; 562 563 // Font sizes. 564 $fluid_font_size_settings = isset( $preset['fluid'] ) ? $preset['fluid'] : null; 565 566 // A font size has explicitly bypassed fluid calculations. 567 if ( false === $fluid_font_size_settings ) { 568 return $preset['size']; 569 } 570 571 // Try to grab explicit min and max fluid font sizes. 572 $minimum_font_size_raw = isset( $fluid_font_size_settings['min'] ) ? $fluid_font_size_settings['min'] : null; 573 $maximum_font_size_raw = isset( $fluid_font_size_settings['max'] ) ? $fluid_font_size_settings['max'] : null; 574 575 // Font sizes. 576 $preferred_size = wp_get_typography_value_and_unit( $preset['size'] ); 577 578 // Protects against unsupported units. 579 if ( empty( $preferred_size['unit'] ) ) { 580 return $preset['size']; 581 } 582 583 /* 584 * Normalizes the minimum font size limit according to the incoming unit, 585 * in order to perform comparative checks. 586 */ 587 $minimum_font_size_limit = wp_get_typography_value_and_unit( 588 $minimum_font_size_limit, 589 array( 590 'coerce_to' => $preferred_size['unit'], 591 ) 592 ); 593 594 // Don't enforce minimum font size if a font size has explicitly set a min and max value. 595 if ( ! empty( $minimum_font_size_limit ) && ( ! $minimum_font_size_raw && ! $maximum_font_size_raw ) ) { 596 /* 597 * If a minimum size was not passed to this function 598 * and the user-defined font size is lower than $minimum_font_size_limit, 599 * do not calculate a fluid value. 600 */ 601 if ( $preferred_size['value'] <= $minimum_font_size_limit['value'] ) { 602 return $preset['size']; 603 } 604 } 605 606 // If no fluid max font size is available use the incoming value. 607 if ( ! $maximum_font_size_raw ) { 608 $maximum_font_size_raw = $preferred_size['value'] . $preferred_size['unit']; 609 } 610 611 /* 612 * If no minimumFontSize is provided, create one using 613 * the given font size multiplied by the min font size scale factor. 614 */ 615 if ( ! $minimum_font_size_raw ) { 616 $preferred_font_size_in_px = 'px' === $preferred_size['unit'] ? $preferred_size['value'] : $preferred_size['value'] * 16; 617 618 /* 619 * The scale factor is a multiplier that affects how quickly the curve will move towards the minimum, 620 * that is, how quickly the size factor reaches 0 given increasing font size values. 621 * For a - b * log2(), lower values of b will make the curve move towards the minimum faster. 622 * The scale factor is constrained between min and max values. 623 */ 624 $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 ); 625 $calculated_minimum_font_size = round( $preferred_size['value'] * $minimum_font_size_factor, 3 ); 626 627 // Only use calculated min font size if it's > $minimum_font_size_limit value. 628 if ( ! empty( $minimum_font_size_limit ) && $calculated_minimum_font_size <= $minimum_font_size_limit['value'] ) { 629 $minimum_font_size_raw = $minimum_font_size_limit['value'] . $minimum_font_size_limit['unit']; 630 } else { 631 $minimum_font_size_raw = $calculated_minimum_font_size . $preferred_size['unit']; 632 } 633 } 634 635 $fluid_font_size_value = wp_get_computed_fluid_typography_value( 636 array( 637 'minimum_viewport_width' => $minimum_viewport_width, 638 'maximum_viewport_width' => $maximum_viewport_width, 639 'minimum_font_size' => $minimum_font_size_raw, 640 'maximum_font_size' => $maximum_font_size_raw, 641 'scale_factor' => $default_scale_factor, 642 ) 643 ); 644 645 if ( ! empty( $fluid_font_size_value ) ) { 646 return $fluid_font_size_value; 647 } 648 649 return $preset['size']; 650 } 651 652 // Register the block support. 653 WP_Block_Supports::get_instance()->register( 654 'typography', 655 array( 656 'register_attribute' => 'wp_register_typography_support', 657 'apply' => 'wp_apply_typography_support', 658 ) 659 );
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| Generated : Fri Apr 19 08:20:01 2024 | Cross-referenced by PHPXref |