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   1  <?php
   2  /**
   3   * Twenty Sixteen functions and definitions
   4   *
   5   * Sets up the theme and provides some helper functions, which are used in the
   6   * theme as custom template tags. Others are attached to action and filter
   7   * hooks in WordPress to change core functionality.
   8   *
   9   * When using a child theme you can override certain functions (those wrapped
  10   * in a function_exists() call) by defining them first in your child theme's
  11   * functions.php file. The child theme's functions.php file is included before
  12   * the parent theme's file, so the child theme functions would be used.
  13   *
  14   * @link https://developer.wordpress.org/themes/basics/theme-functions/
  15   * @link https://developer.wordpress.org/themes/advanced-topics/child-themes/
  16   *
  17   * Functions that are not pluggable (not wrapped in function_exists()) are
  18   * instead attached to a filter or action hook.
  19   *
  20   * For more information on hooks, actions, and filters,
  21   * {@link https://developer.wordpress.org/plugins/}
  22   *
  23   * @package WordPress
  24   * @subpackage Twenty_Sixteen
  25   * @since Twenty Sixteen 1.0
  26   */
  27  
  28  /**
  29   * Twenty Sixteen only works in WordPress 4.4 or later.
  30   */
  31  if ( version_compare( $GLOBALS['wp_version'], '4.4-alpha', '<' ) ) {
  32      require get_template_directory() . '/inc/back-compat.php';
  33  }
  34  
  35  if ( ! function_exists( 'twentysixteen_setup' ) ) :
  36      /**
  37       * Sets up theme defaults and registers support for various WordPress features.
  38       *
  39       * Note that this function is hooked into the after_setup_theme hook, which
  40       * runs before the init hook. The init hook is too late for some features, such
  41       * as indicating support for post thumbnails.
  42       *
  43       * Create your own twentysixteen_setup() function to override in a child theme.
  44       *
  45       * @since Twenty Sixteen 1.0
  46       */
  47  	function twentysixteen_setup() {
  48          /*
  49           * Make theme available for translation.
  50           * Translations can be filed at WordPress.org. See: https://translate.wordpress.org/projects/wp-themes/twentysixteen
  51           * If you're building a theme based on Twenty Sixteen, use a find and replace
  52           * to change 'twentysixteen' to the name of your theme in all the template files.
  53           *
  54           * Manual loading of text domain is not required after the introduction of
  55           * just in time translation loading in WordPress version 4.6.
  56           *
  57           * @ticket 58318
  58           */
  59          if ( version_compare( $GLOBALS['wp_version'], '4.6', '<' ) ) {
  60              load_theme_textdomain( 'twentysixteen' );
  61          }
  62  
  63          // Add default posts and comments RSS feed links to head.
  64          add_theme_support( 'automatic-feed-links' );
  65  
  66          /*
  67           * Let WordPress manage the document title.
  68           * By adding theme support, we declare that this theme does not use a
  69           * hard-coded <title> tag in the document head, and expect WordPress to
  70           * provide it for us.
  71           */
  72          add_theme_support( 'title-tag' );
  73  
  74          /*
  75           * Enable support for custom logo.
  76           *
  77           *  @since Twenty Sixteen 1.2
  78           */
  79          add_theme_support(
  80              'custom-logo',
  81              array(
  82                  'height'      => 240,
  83                  'width'       => 240,
  84                  'flex-height' => true,
  85              )
  86          );
  87  
  88          /*
  89           * Enable support for Post Thumbnails on posts and pages.
  90           *
  91           * @link https://developer.wordpress.org/reference/functions/add_theme_support/#post-thumbnails
  92           */
  93          add_theme_support( 'post-thumbnails' );
  94          set_post_thumbnail_size( 1200, 9999 );
  95  
  96          // This theme uses wp_nav_menu() in two locations.
  97          register_nav_menus(
  98              array(
  99                  'primary' => __( 'Primary Menu', 'twentysixteen' ),
 100                  'social'  => __( 'Social Links Menu', 'twentysixteen' ),
 101              )
 102          );
 103  
 104          /*
 105           * Switch default core markup for search form, comment form, and comments
 106           * to output valid HTML5.
 107           */
 108          add_theme_support(
 109              'html5',
 110              array(
 111                  'search-form',
 112                  'comment-form',
 113                  'comment-list',
 114                  'gallery',
 115                  'caption',
 116                  'script',
 117                  'style',
 118                  'navigation-widgets',
 119              )
 120          );
 121  
 122          /*
 123           * Enable support for Post Formats.
 124           *
 125           * See: https://developer.wordpress.org/advanced-administration/wordpress/post-formats/
 126           */
 127          add_theme_support(
 128              'post-formats',
 129              array(
 130                  'aside',
 131                  'image',
 132                  'video',
 133                  'quote',
 134                  'link',
 135                  'gallery',
 136                  'status',
 137                  'audio',
 138                  'chat',
 139              )
 140          );
 141  
 142          /*
 143           * This theme styles the visual editor to resemble the theme style,
 144           * specifically font, colors, icons, and column width. When fonts are
 145           * self-hosted, the theme directory needs to be removed first.
 146           */
 147          $font_stylesheet = str_replace(
 148              array( get_template_directory_uri() . '/', get_stylesheet_directory_uri() . '/' ),
 149              '',
 150              (string) twentysixteen_fonts_url()
 151          );
 152          add_editor_style( array( 'css/editor-style.css', $font_stylesheet ) );
 153  
 154          // Load regular editor styles into the new block-based editor.
 155          add_theme_support( 'editor-styles' );
 156  
 157          // Load default block styles.
 158          add_theme_support( 'wp-block-styles' );
 159  
 160          // Add support for responsive embeds.
 161          add_theme_support( 'responsive-embeds' );
 162  
 163          // Add support for custom color scheme.
 164          add_theme_support(
 165              'editor-color-palette',
 166              array(
 167                  array(
 168                      'name'  => __( 'Dark Gray', 'twentysixteen' ),
 169                      'slug'  => 'dark-gray',
 170                      'color' => '#1a1a1a',
 171                  ),
 172                  array(
 173                      'name'  => __( 'Medium Gray', 'twentysixteen' ),
 174                      'slug'  => 'medium-gray',
 175                      'color' => '#686868',
 176                  ),
 177                  array(
 178                      'name'  => __( 'Light Gray', 'twentysixteen' ),
 179                      'slug'  => 'light-gray',
 180                      'color' => '#e5e5e5',
 181                  ),
 182                  array(
 183                      'name'  => __( 'White', 'twentysixteen' ),
 184                      'slug'  => 'white',
 185                      'color' => '#fff',
 186                  ),
 187                  array(
 188                      'name'  => __( 'Blue Gray', 'twentysixteen' ),
 189                      'slug'  => 'blue-gray',
 190                      'color' => '#4d545c',
 191                  ),
 192                  array(
 193                      'name'  => __( 'Bright Blue', 'twentysixteen' ),
 194                      'slug'  => 'bright-blue',
 195                      'color' => '#007acc',
 196                  ),
 197                  array(
 198                      'name'  => __( 'Light Blue', 'twentysixteen' ),
 199                      'slug'  => 'light-blue',
 200                      'color' => '#9adffd',
 201                  ),
 202                  array(
 203                      'name'  => __( 'Dark Brown', 'twentysixteen' ),
 204                      'slug'  => 'dark-brown',
 205                      'color' => '#402b30',
 206                  ),
 207                  array(
 208                      'name'  => __( 'Medium Brown', 'twentysixteen' ),
 209                      'slug'  => 'medium-brown',
 210                      'color' => '#774e24',
 211                  ),
 212                  array(
 213                      'name'  => __( 'Dark Red', 'twentysixteen' ),
 214                      'slug'  => 'dark-red',
 215                      'color' => '#640c1f',
 216                  ),
 217                  array(
 218                      'name'  => __( 'Bright Red', 'twentysixteen' ),
 219                      'slug'  => 'bright-red',
 220                      'color' => '#ff675f',
 221                  ),
 222                  array(
 223                      'name'  => __( 'Yellow', 'twentysixteen' ),
 224                      'slug'  => 'yellow',
 225                      'color' => '#ffef8e',
 226                  ),
 227              )
 228          );
 229  
 230          // Indicate widget sidebars can use selective refresh in the Customizer.
 231          add_theme_support( 'customize-selective-refresh-widgets' );
 232  
 233          // Add support for custom line height controls.
 234          add_theme_support( 'custom-line-height' );
 235      }
 236  endif; // twentysixteen_setup()
 237  add_action( 'after_setup_theme', 'twentysixteen_setup' );
 238  
 239  /**
 240   * Sets the content width in pixels, based on the theme's design and stylesheet.
 241   *
 242   * Priority 0 to make it available to lower priority callbacks.
 243   *
 244   * @global int $content_width
 245   *
 246   * @since Twenty Sixteen 1.0
 247   */
 248  function twentysixteen_content_width() {
 249      /**
 250       * Filters Twenty Sixteen content width of the theme.
 251       *
 252       * @since Twenty Sixteen 1.0
 253       *
 254       * @param int $content_width Content width in pixels.
 255       */
 256      $GLOBALS['content_width'] = apply_filters( 'twentysixteen_content_width', 840 );
 257  }
 258  add_action( 'after_setup_theme', 'twentysixteen_content_width', 0 );
 259  
 260  /**
 261   * Adds preconnect for Google Fonts.
 262   *
 263   * @since Twenty Sixteen 1.6
 264   * @deprecated Twenty Sixteen 2.9 Disabled filter because, by default, fonts are self-hosted.
 265   *
 266   * @param array  $urls          URLs to print for resource hints.
 267   * @param string $relation_type The relation type the URLs are printed.
 268   * @return array URLs to print for resource hints.
 269   */
 270  function twentysixteen_resource_hints( $urls, $relation_type ) {
 271      if ( wp_style_is( 'twentysixteen-fonts', 'queue' ) && 'preconnect' === $relation_type ) {
 272          $urls[] = array(
 273              'href' => 'https://fonts.gstatic.com',
 274              'crossorigin',
 275          );
 276      }
 277  
 278      return $urls;
 279  }
 280  // add_filter( 'wp_resource_hints', 'twentysixteen_resource_hints', 10, 2 );
 281  
 282  /**
 283   * Registers a widget area.
 284   *
 285   * @link https://developer.wordpress.org/reference/functions/register_sidebar/
 286   *
 287   * @since Twenty Sixteen 1.0
 288   */
 289  function twentysixteen_widgets_init() {
 290      register_sidebar(
 291          array(
 292              'name'          => __( 'Sidebar', 'twentysixteen' ),
 293              'id'            => 'sidebar-1',
 294              'description'   => __( 'Add widgets here to appear in your sidebar.', 'twentysixteen' ),
 295              'before_widget' => '<section id="%1$s" class="widget %2$s">',
 296              'after_widget'  => '</section>',
 297              'before_title'  => '<h2 class="widget-title">',
 298              'after_title'   => '</h2>',
 299          )
 300      );
 301  
 302      register_sidebar(
 303          array(
 304              'name'          => __( 'Content Bottom 1', 'twentysixteen' ),
 305              'id'            => 'sidebar-2',
 306              'description'   => __( 'Appears at the bottom of the content on posts and pages.', 'twentysixteen' ),
 307              'before_widget' => '<section id="%1$s" class="widget %2$s">',
 308              'after_widget'  => '</section>',
 309              'before_title'  => '<h2 class="widget-title">',
 310              'after_title'   => '</h2>',
 311          )
 312      );
 313  
 314      register_sidebar(
 315          array(
 316              'name'          => __( 'Content Bottom 2', 'twentysixteen' ),
 317              'id'            => 'sidebar-3',
 318              'description'   => __( 'Appears at the bottom of the content on posts and pages.', 'twentysixteen' ),
 319              'before_widget' => '<section id="%1$s" class="widget %2$s">',
 320              'after_widget'  => '</section>',
 321              'before_title'  => '<h2 class="widget-title">',
 322              'after_title'   => '</h2>',
 323          )
 324      );
 325  }
 326  add_action( 'widgets_init', 'twentysixteen_widgets_init' );
 327  
 328  if ( ! function_exists( 'twentysixteen_fonts_url' ) ) :
 329      /**
 330       * Registers fonts for Twenty Sixteen.
 331       *
 332       * Create your own twentysixteen_fonts_url() function to override in a child theme.
 333       *
 334       * @since Twenty Sixteen 1.0
 335       * @since Twenty Sixteen 2.9 Replaced Google URL with self-hosted fonts.
 336       *
 337       * @return string Font stylesheet URL or empty string if disabled.
 338       */
 339  	function twentysixteen_fonts_url() {
 340          $fonts_url = '';
 341          $fonts     = array();
 342  
 343          /*
 344           * translators: If there are characters in your language that are not supported
 345           * by Merriweather, translate this to 'off'. Do not translate into your own language.
 346           */
 347          if ( 'off' !== _x( 'on', 'Merriweather font: on or off', 'twentysixteen' ) ) {
 348              $fonts[] = 'merriweather';
 349          }
 350  
 351          /*
 352           * translators: If there are characters in your language that are not supported
 353           * by Montserrat, translate this to 'off'. Do not translate into your own language.
 354           */
 355          if ( 'off' !== _x( 'on', 'Montserrat font: on or off', 'twentysixteen' ) ) {
 356              $fonts[] = 'montserrat';
 357          }
 358  
 359          /*
 360           * translators: If there are characters in your language that are not supported
 361           * by Inconsolata, translate this to 'off'. Do not translate into your own language.
 362           */
 363          if ( 'off' !== _x( 'on', 'Inconsolata font: on or off', 'twentysixteen' ) ) {
 364              $fonts[] = 'inconsolata';
 365          }
 366  
 367          if ( $fonts ) {
 368              $fonts_url = get_template_directory_uri() . '/fonts/' . implode( '-plus-', $fonts ) . '.css';
 369          }
 370  
 371          return $fonts_url;
 372      }
 373  endif;
 374  
 375  /**
 376   * Handles JavaScript detection.
 377   *
 378   * Adds a `js` class to the root `<html>` element when JavaScript is detected.
 379   *
 380   * @since Twenty Sixteen 1.0
 381   */
 382  function twentysixteen_javascript_detection() {
 383      $js  = "(function(html){html.className = html.className.replace(/\bno-js\b/,'js')})(document.documentElement);";
 384      $js .= "\n//# sourceURL=" . rawurlencode( __FUNCTION__ );
 385  
 386      if ( function_exists( 'wp_print_inline_script_tag' ) ) {
 387          wp_print_inline_script_tag( $js );
 388      } else {
 389          echo "<script>$js</script>\n";
 390      }
 391  }
 392  add_action( 'wp_head', 'twentysixteen_javascript_detection', 0 );
 393  
 394  /**
 395   * Enqueues scripts and styles.
 396   *
 397   * @since Twenty Sixteen 1.0
 398   */
 399  function twentysixteen_scripts() {
 400      // Add custom fonts, used in the main stylesheet.
 401      $font_version = ( 0 === strpos( (string) twentysixteen_fonts_url(), get_template_directory_uri() . '/' ) ) ? '20230328' : null;
 402      wp_enqueue_style( 'twentysixteen-fonts', twentysixteen_fonts_url(), array(), $font_version );
 403  
 404      // Add Genericons, used in the main stylesheet.
 405      wp_enqueue_style( 'genericons', get_template_directory_uri() . '/genericons/genericons.css', array(), '20251101' );
 406  
 407      // Theme stylesheet.
 408      wp_enqueue_style( 'twentysixteen-style', get_stylesheet_uri(), array(), '20251202' );
 409  
 410      // Theme block stylesheet.
 411      wp_enqueue_style( 'twentysixteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentysixteen-style' ), '20240817' );
 412  
 413      // Register handles for removed stylesheets and scripts.
 414      wp_register_style( 'twentysixteen-ie', false, array( 'twentysixteen-style' ) );
 415      wp_register_style( 'twentysixteen-ie8', false, array( 'twentysixteen-style' ) );
 416      wp_register_style( 'twentysixteen-ie7', false, array( 'twentysixteen-style' ) );
 417      wp_register_script( 'twentysixteen-html5', false );
 418      wp_register_script( 'twentysixteen-skip-link-focus-fix', get_template_directory_uri() . '/js/skip-link-focus-fix.js', array(), '20230526', array( 'in_footer' => true ) );
 419  
 420      if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
 421          wp_enqueue_script( 'comment-reply' );
 422      }
 423  
 424      if ( is_singular() && wp_attachment_is_image() ) {
 425          wp_enqueue_script( 'twentysixteen-keyboard-image-navigation', get_template_directory_uri() . '/js/keyboard-image-navigation.js', array( 'jquery' ), '20170530' );
 426      }
 427  
 428      wp_enqueue_script(
 429          'twentysixteen-script',
 430          get_template_directory_uri() . '/js/functions.js',
 431          array( 'jquery' ),
 432          '20230629',
 433          array(
 434              'in_footer' => false, // Because involves header.
 435              'strategy'  => 'defer',
 436          )
 437      );
 438  
 439      wp_localize_script(
 440          'twentysixteen-script',
 441          'screenReaderText',
 442          array(
 443              'expand'   => __( 'expand child menu', 'twentysixteen' ),
 444              'collapse' => __( 'collapse child menu', 'twentysixteen' ),
 445          )
 446      );
 447  }
 448  add_action( 'wp_enqueue_scripts', 'twentysixteen_scripts' );
 449  
 450  /**
 451   * Enqueues styles for the block-based editor.
 452   *
 453   * @since Twenty Sixteen 1.6
 454   */
 455  function twentysixteen_block_editor_styles() {
 456      // Block styles.
 457      wp_enqueue_style( 'twentysixteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20250715' );
 458      // Add custom fonts.
 459      $font_version = ( 0 === strpos( (string) twentysixteen_fonts_url(), get_template_directory_uri() . '/' ) ) ? '20230328' : null;
 460      wp_enqueue_style( 'twentysixteen-fonts', twentysixteen_fonts_url(), array(), $font_version );
 461  }
 462  add_action( 'enqueue_block_editor_assets', 'twentysixteen_block_editor_styles' );
 463  
 464  /**
 465   * Adds custom classes to the array of body classes.
 466   *
 467   * @since Twenty Sixteen 1.0
 468   *
 469   * @param array $classes Classes for the body element.
 470   * @return array (Maybe) filtered body classes.
 471   */
 472  function twentysixteen_body_classes( $classes ) {
 473      // Adds a class of custom-background-image to sites with a custom background image.
 474      if ( get_background_image() ) {
 475          $classes[] = 'custom-background-image';
 476      }
 477  
 478      // Adds a class of group-blog to sites with more than 1 published author.
 479      if ( is_multi_author() ) {
 480          $classes[] = 'group-blog';
 481      }
 482  
 483      // Adds a class of no-sidebar to sites without active sidebar.
 484      if ( ! is_active_sidebar( 'sidebar-1' ) ) {
 485          $classes[] = 'no-sidebar';
 486      }
 487  
 488      // Adds a class of hfeed to non-singular pages.
 489      if ( ! is_singular() ) {
 490          $classes[] = 'hfeed';
 491      }
 492  
 493      return $classes;
 494  }
 495  add_filter( 'body_class', 'twentysixteen_body_classes' );
 496  
 497  /**
 498   * Converts a HEX value to RGB.
 499   *
 500   * @since Twenty Sixteen 1.0
 501   *
 502   * @param string $color The original color, in 3- or 6-digit hexadecimal form.
 503   * @return array Array containing RGB (red, green, and blue) values for the given
 504   *               HEX code, empty array otherwise.
 505   */
 506  function twentysixteen_hex2rgb( $color ) {
 507      $color = trim( $color, '#' );
 508  
 509      if ( strlen( $color ) === 3 ) {
 510          $r = hexdec( substr( $color, 0, 1 ) . substr( $color, 0, 1 ) );
 511          $g = hexdec( substr( $color, 1, 1 ) . substr( $color, 1, 1 ) );
 512          $b = hexdec( substr( $color, 2, 1 ) . substr( $color, 2, 1 ) );
 513      } elseif ( strlen( $color ) === 6 ) {
 514          $r = hexdec( substr( $color, 0, 2 ) );
 515          $g = hexdec( substr( $color, 2, 2 ) );
 516          $b = hexdec( substr( $color, 4, 2 ) );
 517      } else {
 518          return array();
 519      }
 520  
 521      return array(
 522          'red'   => $r,
 523          'green' => $g,
 524          'blue'  => $b,
 525      );
 526  }
 527  
 528  /**
 529   * Custom template tags for this theme.
 530   */
 531  require get_template_directory() . '/inc/template-tags.php';
 532  
 533  
 534  /**
 535   * Registers block patterns and pattern categories.
 536   *
 537   * @since Twenty Sixteen 3.4
 538   */
 539  function twentysixteen_register_block_patterns() {
 540      require get_template_directory() . '/inc/block-patterns.php';
 541  }
 542  
 543  add_action( 'init', 'twentysixteen_register_block_patterns' );
 544  
 545  /**
 546   * Customizer additions.
 547   */
 548  require get_template_directory() . '/inc/customizer.php';
 549  
 550  /**
 551   * Adds custom image sizes attribute to enhance responsive image functionality
 552   * for content images
 553   *
 554   * @since Twenty Sixteen 1.0
 555   *
 556   * @param string $sizes A source size value for use in a 'sizes' attribute.
 557   * @param array  $size  Image size. Accepts an array of width and height
 558   *                      values in pixels (in that order).
 559   * @return string A source size value for use in a content image 'sizes' attribute.
 560   */
 561  function twentysixteen_content_image_sizes_attr( $sizes, $size ) {
 562      $width = $size[0];
 563  
 564      if ( 840 <= $width ) {
 565          $sizes = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px';
 566      }
 567  
 568      if ( 'page' === get_post_type() ) {
 569          if ( 840 > $width ) {
 570              $sizes = '(max-width: ' . $width . 'px) 85vw, ' . $width . 'px';
 571          }
 572      } else {
 573          if ( 840 > $width && 600 <= $width ) {
 574              $sizes = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px';
 575          } elseif ( 600 > $width ) {
 576              $sizes = '(max-width: ' . $width . 'px) 85vw, ' . $width . 'px';
 577          }
 578      }
 579  
 580      return $sizes;
 581  }
 582  add_filter( 'wp_calculate_image_sizes', 'twentysixteen_content_image_sizes_attr', 10, 2 );
 583  
 584  /**
 585   * Adds custom image sizes attribute to enhance responsive image functionality
 586   * for post thumbnails
 587   *
 588   * @since Twenty Sixteen 1.0
 589   *
 590   * @param string[]     $attr       Array of attribute values for the image markup, keyed by attribute name.
 591   *                                 See wp_get_attachment_image().
 592   * @param WP_Post      $attachment Image attachment post.
 593   * @param string|int[] $size       Requested image size. Can be any registered image size name, or
 594   *                                 an array of width and height values in pixels (in that order).
 595   * @return string[] The filtered attributes for the image markup.
 596   */
 597  function twentysixteen_post_thumbnail_sizes_attr( $attr, $attachment, $size ) {
 598      if ( 'post-thumbnail' === $size ) {
 599          if ( is_active_sidebar( 'sidebar-1' ) ) {
 600              $attr['sizes'] = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 60vw, (max-width: 1362px) 62vw, 840px';
 601          } else {
 602              $attr['sizes'] = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 88vw, 1200px';
 603          }
 604      }
 605      return $attr;
 606  }
 607  add_filter( 'wp_get_attachment_image_attributes', 'twentysixteen_post_thumbnail_sizes_attr', 10, 3 );
 608  
 609  /**
 610   * Modifies tag cloud widget arguments to display all tags in the same font size
 611   * and use list format for better accessibility.
 612   *
 613   * @since Twenty Sixteen 1.1
 614   *
 615   * @param array $args Arguments for tag cloud widget.
 616   * @return array The filtered arguments for tag cloud widget.
 617   */
 618  function twentysixteen_widget_tag_cloud_args( $args ) {
 619      $args['largest']  = 1;
 620      $args['smallest'] = 1;
 621      $args['unit']     = 'em';
 622      $args['format']   = 'list';
 623  
 624      return $args;
 625  }
 626  add_filter( 'widget_tag_cloud_args', 'twentysixteen_widget_tag_cloud_args' );