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   1  <?php
   2  /**
   3   * Align block support flag.
   4   *
   5   * @package WordPress
   6   * @since 5.6.0
   7   */
   8  
   9  /**
  10   * Registers the align block attribute for block types that support it.
  11   *
  12   * @since 5.6.0
  13   * @access private
  14   *
  15   * @param WP_Block_Type $block_type Block Type.
  16   */
  17  function wp_register_alignment_support( $block_type ) {
  18      $has_align_support = block_has_support( $block_type, 'align', false );
  19      if ( $has_align_support ) {
  20          if ( ! $block_type->attributes ) {
  21              $block_type->attributes = array();
  22          }
  23  
  24          if ( ! array_key_exists( 'align', $block_type->attributes ) ) {
  25              $block_type->attributes['align'] = array(
  26                  'type' => 'string',
  27                  'enum' => array( 'left', 'center', 'right', 'wide', 'full', '' ),
  28              );
  29          }
  30      }
  31  }
  32  
  33  /**
  34   * Adds CSS classes for block alignment to the incoming attributes array.
  35   * This will be applied to the block markup in the front-end.
  36   *
  37   * @since 5.6.0
  38   * @access private
  39   *
  40   * @param WP_Block_Type $block_type       Block Type.
  41   * @param array         $block_attributes Block attributes.
  42   * @return array Block alignment CSS classes and inline styles.
  43   */
  44  function wp_apply_alignment_support( $block_type, $block_attributes ) {
  45      $attributes        = array();
  46      $has_align_support = block_has_support( $block_type, 'align', false );
  47      if ( $has_align_support ) {
  48          $has_block_alignment = array_key_exists( 'align', $block_attributes );
  49  
  50          if ( $has_block_alignment ) {
  51              $attributes['class'] = sprintf( 'align%s', $block_attributes['align'] );
  52          }
  53      }
  54  
  55      return $attributes;
  56  }
  57  
  58  // Register the block support.
  59  WP_Block_Supports::get_instance()->register(
  60      'align',
  61      array(
  62          'register_attribute' => 'wp_register_alignment_support',
  63          'apply'              => 'wp_apply_alignment_support',
  64      )
  65  );