class-twenty-twenty-one-custom-colors.php (5044B)
1 <?php 2 /** 3 * Custom Colors Class 4 * 5 * @package WordPress 6 * @subpackage Twenty_Twenty_One 7 * @since Twenty Twenty-One 1.0 8 */ 9 10 /** 11 * This class is in charge of color customization via the Customizer. 12 */ 13 class Twenty_Twenty_One_Custom_Colors { 14 15 /** 16 * Instantiate the object. 17 * 18 * @since Twenty Twenty-One 1.0 19 */ 20 public function __construct() { 21 22 // Enqueue color variables for customizer & frontend. 23 add_action( 'wp_enqueue_scripts', array( $this, 'custom_color_variables' ) ); 24 25 // Enqueue color variables for editor. 26 add_action( 'enqueue_block_editor_assets', array( $this, 'editor_custom_color_variables' ) ); 27 28 // Add body-class if needed. 29 add_filter( 'body_class', array( $this, 'body_class' ) ); 30 } 31 32 /** 33 * Determine the luminance of the given color and then return #fff or #000 so that the text is always readable. 34 * 35 * @since Twenty Twenty-One 1.0 36 * 37 * @param string $background_color The background color. 38 * @return string (hex color) 39 */ 40 public function custom_get_readable_color( $background_color ) { 41 return ( 127 < self::get_relative_luminance_from_hex( $background_color ) ) ? '#000' : '#fff'; 42 } 43 44 /** 45 * Generate color variables. 46 * 47 * Adjust the color value of the CSS variables depending on the background color theme mod. 48 * Both text and link colors needs to be updated. 49 * The code below needs to be updated, because the colors are no longer theme mods. 50 * 51 * @since Twenty Twenty-One 1.0 52 * 53 * @param string|null $context Can be "editor" or null. 54 * @return string 55 */ 56 public function generate_custom_color_variables( $context = null ) { 57 58 $theme_css = 'editor' === $context ? ':root .editor-styles-wrapper{' : ':root{'; 59 $background_color = get_theme_mod( 'background_color', 'D1E4DD' ); 60 61 if ( 'd1e4dd' !== strtolower( $background_color ) ) { 62 $theme_css .= '--global--color-background: #' . $background_color . ';'; 63 $theme_css .= '--global--color-primary: ' . $this->custom_get_readable_color( $background_color ) . ';'; 64 $theme_css .= '--global--color-secondary: ' . $this->custom_get_readable_color( $background_color ) . ';'; 65 $theme_css .= '--button--color-background: ' . $this->custom_get_readable_color( $background_color ) . ';'; 66 $theme_css .= '--button--color-text-hover: ' . $this->custom_get_readable_color( $background_color ) . ';'; 67 68 if ( '#fff' === $this->custom_get_readable_color( $background_color ) ) { 69 $theme_css .= '--table--stripes-border-color: rgba(240, 240, 240, 0.15);'; 70 $theme_css .= '--table--stripes-background-color: rgba(240, 240, 240, 0.15);'; 71 } 72 } 73 74 $theme_css .= '}'; 75 76 return $theme_css; 77 } 78 79 /** 80 * Customizer & frontend custom color variables. 81 * 82 * @since Twenty Twenty-One 1.0 83 * 84 * @return void 85 */ 86 public function custom_color_variables() { 87 if ( 'd1e4dd' !== strtolower( get_theme_mod( 'background_color', 'D1E4DD' ) ) ) { 88 wp_add_inline_style( 'twenty-twenty-one-style', $this->generate_custom_color_variables() ); 89 } 90 } 91 92 /** 93 * Editor custom color variables. 94 * 95 * @since Twenty Twenty-One 1.0 96 * 97 * @return void 98 */ 99 public function editor_custom_color_variables() { 100 wp_enqueue_style( 101 'twenty-twenty-one-custom-color-overrides', 102 get_theme_file_uri( 'assets/css/custom-color-overrides.css' ), 103 array(), 104 wp_get_theme()->get( 'Version' ) 105 ); 106 107 $background_color = get_theme_mod( 'background_color', 'D1E4DD' ); 108 if ( 'd1e4dd' !== strtolower( $background_color ) ) { 109 wp_add_inline_style( 'twenty-twenty-one-custom-color-overrides', $this->generate_custom_color_variables( 'editor' ) ); 110 } 111 } 112 113 /** 114 * Get luminance from a HEX color. 115 * 116 * @static 117 * 118 * @since Twenty Twenty-One 1.0 119 * 120 * @param string $hex The HEX color. 121 * @return int Returns a number (0-255). 122 */ 123 public static function get_relative_luminance_from_hex( $hex ) { 124 125 // Remove the "#" symbol from the beginning of the color. 126 $hex = ltrim( $hex, '#' ); 127 128 // Make sure there are 6 digits for the below calculations. 129 if ( 3 === strlen( $hex ) ) { 130 $hex = substr( $hex, 0, 1 ) . substr( $hex, 0, 1 ) . substr( $hex, 1, 1 ) . substr( $hex, 1, 1 ) . substr( $hex, 2, 1 ) . substr( $hex, 2, 1 ); 131 } 132 133 // Get red, green, blue. 134 $red = hexdec( substr( $hex, 0, 2 ) ); 135 $green = hexdec( substr( $hex, 2, 2 ) ); 136 $blue = hexdec( substr( $hex, 4, 2 ) ); 137 138 // Calculate the luminance. 139 $lum = ( 0.2126 * $red ) + ( 0.7152 * $green ) + ( 0.0722 * $blue ); 140 return (int) round( $lum ); 141 } 142 143 /** 144 * Adds a class to <body> if the background-color is dark. 145 * 146 * @since Twenty Twenty-One 1.0 147 * 148 * @param array $classes The existing body classes. 149 * @return array 150 */ 151 public function body_class( $classes ) { 152 $background_color = get_theme_mod( 'background_color', 'D1E4DD' ); 153 $luminance = self::get_relative_luminance_from_hex( $background_color ); 154 155 if ( 127 > $luminance ) { 156 $classes[] = 'is-dark-theme'; 157 } else { 158 $classes[] = 'is-light-theme'; 159 } 160 161 if ( 225 <= $luminance ) { 162 $classes[] = 'has-background-white'; 163 } 164 165 return $classes; 166 } 167 }