block_form_alter-8.x-1.x-dev/block_form_alter.module

<?php

/**
 * @file
 * This module provides block form alter functions.
 */

use Drupal\Core\Form\FormStateInterface;

/**
 * Implements hook_form_alter().
 */
function block_form_alter_form_alter(&$form, FormStateInterface &$form_state, $form_id) {
  /*
   * Blocks are plugins; however, plugin information is not consistently
   * available from the various modules that render block forms (both core
   * and contrib). Resultantly, it is necessary to perform a variety of checks
   * to determine the plugin of a given block.
   *
   * Block forms for all plugins, excluding block_content and inline_block, can
   * be altered with hook_block_plugin_form_alter().
   *
   * Block forms for the block_content and inline_block plugins can be altered
   * with hook_block_type_form_alter().
   */

  // If block form is rendered by Block module.
  if ($form_id == 'block_form') {
    $build_info = $form_state->getBuildInfo();
    $plugin_id = $build_info['callback_object']->getEntity()->getPluginId();
    _block_form_alter_block_plugin_form_alter_invoke($form, $form_state, $plugin_id);
  }

  // If block form is rendered by Block Content module.
  elseif (preg_match('/block_content_(.*)_edit_form/', $form_id, $matches) || preg_match('/block_content_(.*)_form/', $form_id, $matches)) {
    $block_type = $matches[1];
    _block_form_alter_block_type_form_alter_invoke($form, $form_state, $block_type);
  }

  // If block form is rendered by Layout Builder module.
  elseif ($form_id == 'layout_builder_add_block' || $form_id == 'layout_builder_update_block') {
    if ($form_id == 'layout_builder_add_block') {
      $storage = $form_state->getStorage();
      $component_config = $storage['layout_builder__component']->get('configuration');

    }
    elseif ($form_id == 'layout_builder_update_block') {
      $build_info = $form_state->getBuildInfo();
      $block = $build_info['callback_object']->getCurrentComponent();
      $component_config = $block->get('configuration');
    }
    $block_id = explode(':', $component_config['id']);
    $plugin_id = $block_id[0];

    // Inline blocks.
    if ($plugin_id == 'inline_block') {
      // Because the block form is added with a process function for
      // inline blocks, it is necessary to alter them via a subsequent process
      // function.
      $form['settings']['block_form']['#process'][] = '_block_form_alter_block_type_form_alter_inline_block_process';
    }
    // All other block plugins.
    else {
      _block_form_alter_block_plugin_form_alter_invoke($form, $form_state, $plugin_id);
    }
  }
}

/**
 * Process callback for inline block forms.
 *
 * @param array $element
 *   The containing element.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The form state.
 *
 * @return array
 *   The containing element, as altered.
 */
function _block_form_alter_block_type_form_alter_inline_block_process(array &$element, FormStateInterface &$form_state) {
  $block_type = $element['#block']->bundle();
  _block_form_alter_block_type_form_alter_invoke($element, $form_state, $block_type);
  return $element;
}

/**
 * Helper function to alter forms for block_content and inline_block plugins.
 *
 * @param array $form
 *   Nested array of form elements that comprise the form.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The form state.
 * @param string $block_type
 *   The machine name of the custom block bundle.
 */
function _block_form_alter_block_type_form_alter_invoke(array &$form, FormStateInterface &$form_state, string $block_type) {
  \Drupal::moduleHandler()->invokeAll('block_type_form_alter', [
    &$form,
    &$form_state,
    $block_type,
  ]);
}

/**
 * Helper function to alter forms for block plugins.
 *
 * Block forms for the 'block_content' and 'inline_content' plugins must use
 * _block_form_alter_block_type_form_alter_invoke().
 *
 * @param array $form
 *   Nested array of form elements that comprise the form.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The form state.
 * @param string $plugin
 *   The machine name of the plugin implementing the block.
 */
function _block_form_alter_block_plugin_form_alter_invoke(array &$form, FormStateInterface &$form_state, string $plugin) {
  if ($plugin == 'block_content' || $plugin == 'inline_block') {
    return;
  }
  \Drupal::moduleHandler()->invokeAll('block_plugin_form_alter', [
    &$form,
    &$form_state,
    $plugin,
  ]);
}