public function PluginTypeExampleController::description in Examples for Developers 8

Same name and namespace in other branches

3.x modules/plugin_type_example/src/Controller/PluginTypeExampleController.php \Drupal\plugin_type_example\Controller\PluginTypeExampleController::description()

Displays a page with an overview of our plugin type and plugins.

Lists all the Sandwich plugin definitions by using methods on the \Drupal\plugin_type_example\SandwichPluginManager class. Lists out the description for each plugin found by invoking methods defined on the plugins themselves. You can find the plugins we have defined in the \Drupal\plugin_type_example\Plugin\Sandwich namespace.

Return value

array Render API array with content for the page at /examples/plugin_type_example.

1 string reference to 'PluginTypeExampleController::description'

plugin_type_example.routing.yml in plugin_type_example/plugin_type_example.routing.yml: plugin_type_example/plugin_type_example.routing.yml

File

plugin_type_example/src/Controller/PluginTypeExampleController.php, line 47

Class

PluginTypeExampleController: Controller for our example pages.

Namespace

Drupal\plugin_type_example\Controller

Code

public function description() {
  $build = [];
  $build['intro'] = [
    '#markup' => $this
      ->t("This page lists the sandwich plugins we've created. The sandwich plugin type is defined in Drupal\\plugin_type_example\\SandwichPluginManager. The various plugins are defined in the Drupal\\plugin_type_example\\Plugin\\Sandwich namespace."),
  ];

  // Get the list of all the sandwich plugins defined on the system from the
  // plugin manager. Note that at this point, what we have is *definitions* of
  // plugins, not the plugins themselves.
  $sandwich_plugin_definitions = $this->sandwichManager
    ->getDefinitions();

  // Let's output a list of the plugin definitions we now have.
  $items = [];
  foreach ($sandwich_plugin_definitions as $sandwich_plugin_definition) {

    // Here we use various properties from the plugin definition. These values
    // are defined in the annotation at the top of the plugin class: see
    // \Drupal\plugin_type_example\Plugin\Sandwich\ExampleHamSandwich.
    $items[] = $this
      ->t("@id (calories: @calories, description: @description )", [
      '@id' => $sandwich_plugin_definition['id'],
      '@calories' => $sandwich_plugin_definition['calories'],
      '@description' => $sandwich_plugin_definition['description'],
    ]);
  }

  // Add our list to the render array.
  $build['plugin_definitions'] = [
    '#theme' => 'item_list',
    '#title' => 'Sandwich plugin definitions',
    '#items' => $items,
  ];

  // If we want just a single plugin definition, we can use getDefinition().
  // This requires us to know the ID of the plugin we want. This is set in the
  // annotation on the plugin class: see
  // \Drupal\plugin_type_example\Plugin\Sandwich\ExampleHamSandwich.
  $ham_sandwich_plugin_definition = $this->sandwichManager
    ->getDefinition('meatball_sandwich');

  // To get an instance of a plugin, we call createInstance() on the plugin
  // manager, passing the ID of the plugin we want to load. Let's output a
  // list of the plugins by loading an instance of each plugin definition and
  // collecting the description from each.
  $items = [];

  // The array of plugin definitions is keyed by plugin id, so we can just use
  // that to load our plugin instances.
  foreach ($sandwich_plugin_definitions as $plugin_id => $sandwich_plugin_definition) {

    // We now have a plugin instance. From here on it can be treated just as
    // any other object; have its properties examined, methods called, etc.
    $plugin = $this->sandwichManager
      ->createInstance($plugin_id, [
      'of' => 'configuration values',
    ]);
    $items[] = $plugin
      ->description();
  }
  $build['plugins'] = [
    '#theme' => 'item_list',
    '#title' => 'Sandwich plugins',
    '#items' => $items,
  ];
  return $build;
}

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