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d_p module for Droopler distribution

The ParagraphSetting plugin

The d_p module provides a new plugin type ParagraphSetting which is used in the setting field widget on the paragraphs form. You can review the plugins implemented by the module under the namespace Plugin\ParagraphSetting. The paragraph setting plugins are based on the Drupal Form API which is used to render, process and validate the settings form elements.

Plugin manager

The plugins are managed by the plugin manager d_p.paragraph_settings.plugin.manager. This manager is responsible for loading all the available plugins into the widget, as an array of the form elements. The configuration form is built only once, then it is stored in the cache. You need to clear the cache each time you changed something in your plugin.

Adding the custom plugin

In order to create a custom paragraph setting plugin, you need to put your plugin file in the your_module/src/Plugin/ParagraphSettings directory of your custom module. The easiest way is to extend the Drupal\d_p\ParagraphSettingPluginBase and give your own implementation of some methods ex.formElement. All the methods are documented in the class and the interface. If the type of your form element will be the select then it is required to implement the Drupal\d_p\ParagraphSettingSelectInterface as this interface is checked in the further processing of the select elements.

Each plugin needs to be described using Drupal\d_p\Annotation\ParagraphSetting annotation. In addition to the id which is always required to define a unique plugin, there are the label and the settings that should be defined. The settings array may contain the weight and the parent keys (at least those two are only used in the further processing).

By default, the annotation is used in the form element and to define the relations between the elements:

  • label - is used as #title and it is returned by the
  • ParagraphSettingPluginBase::label
  • weight - is used as #weight to defined the order of the elements
  • and it is returned by the ParagraphSettingPluginBase::getWeight
  • parent - is used to nest the element under the defined parent id

The example of the plugin annotation may look like this:

/**
 * @ParagraphSetting(
 *   id = "example-plugin-id",
 *   label = @Translation("Example paragraph setting plugin"),
 *   settings = {
 *      "parent" = "example-parent-plugin-id",
 *      "weight" = -10,
 *   }
 * )
 */

Alterations

Replacing the existing plugin

By default, the plugin manager sets the alter info id which is used to invoke a specific hook to alter the plugins definitions. In order to alter the ParagraphSetting plugin you will have to define hook: hook_paragraph_setting_info_alter.

The example hook may look like this:

function my_module_paragraph_setting_info_alter(array &$definitions) {
  $definitions['example_plugin_id'] = [
    'class' => 'Drupal\my_module\Plugin\ParagraphSetting\ExampleAltered',
  ];
}

Replace the setting form

The setting from containing all the form elements defined by each ParagraphSetting plugin is built by the plugin manager. These form elements may be altered right before being stored in the cache. In order to do that, you can use the hook_d_settings_alter hook described in the d_p.api.php.

The example hook implementation may look like this:

function my_module_d_settings_alter(array &$settings_form) {
  $settings_form['example_plugin_id']['#weight'] = 10;
}

Altering the widget

You can alter the Drupal\d_p\Plugin\Field\FieldWidget\SettingsWidget (field_d_p_set_settings) widget the same way you usually alter any other Drupal widget. It is possible to define a new widget which extends the SettingsWidget and use it instead. You can also use hooks to alter the widget forms:

Note: This method is not recommended, as long as there is no other way to alter the form elements or validate them using the alter methods described above.