Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/config_translation/src/Plugin/Derivative/ConfigTranslationContextualLinks.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config_translation\Plugin\Derivative\ConfigTranslationContextualLinks.
+ */
+
+namespace Drupal\config_translation\Plugin\Derivative;
+
+use Drupal\Component\Utility\Unicode;
+use Drupal\Component\Plugin\Derivative\DeriverBase;
+use Drupal\config_translation\ConfigMapperManagerInterface;
+use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides dynamic contextual links for configuration translation.
+ */
+class ConfigTranslationContextualLinks extends DeriverBase implements ContainerDeriverInterface {
+
+  /**
+   * The mapper plugin discovery service.
+   *
+   * @var \Drupal\config_translation\ConfigMapperManagerInterface
+   */
+  protected $mapperManager;
+
+  /**
+   * Constructs a new ConfigTranslationContextualLinks.
+   *
+   * @param \Drupal\config_translation\ConfigMapperManagerInterface $mapper_manager
+   *   The mapper plugin discovery service.
+   */
+  public function __construct(ConfigMapperManagerInterface $mapper_manager) {
+    $this->mapperManager = $mapper_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, $base_plugin_id) {
+    return new static(
+      $container->get('plugin.manager.config_translation.mapper')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDerivativeDefinitions($base_plugin_definition) {
+    // Create contextual links for all mappers.
+    $mappers = $this->mapperManager->getMappers();
+    foreach ($mappers as $plugin_id => $mapper) {
+      // @todo Contextual groups do not map to entity types in a predictable
+      //   way. See https://www.drupal.org/node/2134841 to make them
+      //   predictable.
+      $group_name = $mapper->getContextualLinkGroup();
+      if (empty($group_name)) {
+        continue;
+      }
+
+      /** @var \Drupal\config_translation\ConfigMapperInterface $mapper */
+      $route_name = $mapper->getOverviewRouteName();
+      $this->derivatives[$route_name] = $base_plugin_definition;
+      $this->derivatives[$route_name]['config_translation_plugin_id'] = $plugin_id;
+      $this->derivatives[$route_name]['class'] = '\Drupal\config_translation\Plugin\Menu\ContextualLink\ConfigTranslationContextualLink';
+      $this->derivatives[$route_name]['route_name'] = $route_name;
+      $this->derivatives[$route_name]['group'] = $group_name;
+    }
+    return parent::getDerivativeDefinitions($base_plugin_definition);
+  }
+
+}

core/modules/config_translation/src/Plugin/Derivative/ConfigTranslationLocalTasks.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config_translation\Plugin\Derivative\ConfigTranslationLocalTasks.
+ */
+
+namespace Drupal\config_translation\Plugin\Derivative;
+
+use Drupal\config_translation\ConfigMapperManagerInterface;
+use Drupal\Component\Plugin\Derivative\DeriverBase;
+use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides dynamic local tasks for config translation.
+ */
+class ConfigTranslationLocalTasks extends DeriverBase implements ContainerDeriverInterface {
+
+  /**
+   * The mapper plugin discovery service.
+   *
+   * @var \Drupal\config_translation\ConfigMapperManagerInterface
+   */
+  protected $mapperManager;
+
+  /**
+   * The base plugin ID.
+   *
+   * @var string
+   */
+  protected $basePluginId;
+
+  /**
+   * Constructs a new ConfigTranslationLocalTasks.
+   *
+   * @param string $base_plugin_id
+   *   The base plugin ID.
+   * @param \Drupal\config_translation\ConfigMapperManagerInterface $mapper_manager
+   *   The mapper plugin discovery service.
+   */
+  public function __construct($base_plugin_id, ConfigMapperManagerInterface $mapper_manager) {
+    $this->basePluginId = $base_plugin_id;
+    $this->mapperManager = $mapper_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, $base_plugin_id) {
+    return new static(
+      $base_plugin_id,
+      $container->get('plugin.manager.config_translation.mapper')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDerivativeDefinitions($base_plugin_definition) {
+    $mappers = $this->mapperManager->getMappers();
+    foreach ($mappers as $plugin_id => $mapper) {
+      /** @var \Drupal\config_translation\ConfigMapperInterface $mapper */
+      $route_name = $mapper->getOverviewRouteName();
+      $base_route = $mapper->getBaseRouteName();
+      if (!empty($base_route)) {
+        $this->derivatives[$route_name] = $base_plugin_definition;
+        $this->derivatives[$route_name]['config_translation_plugin_id'] = $plugin_id;
+        $this->derivatives[$route_name]['class'] = '\Drupal\config_translation\Plugin\Menu\LocalTask\ConfigTranslationLocalTask';
+        $this->derivatives[$route_name]['route_name'] = $route_name;
+        $this->derivatives[$route_name]['base_route'] = $base_route;
+      }
+    }
+    return parent::getDerivativeDefinitions($base_plugin_definition);
+  }
+
+}

core/modules/config_translation/src/Plugin/Menu/ContextualLink/ConfigTranslationContextualLink.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config_translation\Plugin\Menu\ContextualLink\ConfigTranslationContextualLink.
+ */
+
+namespace Drupal\config_translation\Plugin\Menu\ContextualLink;
+
+use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Menu\ContextualLinkDefault;
+
+/**
+ * Defines a contextual link plugin with a dynamic title.
+ */
+class ConfigTranslationContextualLink extends ContextualLinkDefault {
+
+  /**
+   * The mapper plugin discovery service.
+   *
+   * @var \Drupal\config_translation\ConfigMapperManagerInterface
+   */
+  protected $mapperManager;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getTitle() {
+    $options = array();
+    if (!empty($this->pluginDefinition['title_context'])) {
+      $options['context'] = $this->pluginDefinition['title_context'];
+    }
+
+    // Take custom 'config_translation_plugin_id' plugin definition key to
+    // retrieve title. We need to retrieve a runtime title (as opposed to
+    // storing the title on the plugin definition for the link) because
+    // it contains translated parts that we need in the runtime language.
+    $type_name = Unicode::strtolower($this->mapperManager()->createInstance($this->pluginDefinition['config_translation_plugin_id'])->getTypeLabel());
+    return $this->t($this->pluginDefinition['title'], array('@type_name' => $type_name), $options);
+  }
+
+  /**
+   * Gets the mapper manager.
+   *
+   * @return \Drupal\config_translation\ConfigMapperManagerInterface
+   *   The mapper manager.
+   */
+  protected function mapperManager() {
+    if (!$this->mapperManager) {
+      $this->mapperManager = \Drupal::service('plugin.manager.config_translation.mapper');
+    }
+    return $this->mapperManager;
+  }
+
+}

core/modules/config_translation/src/Plugin/Menu/LocalTask/ConfigTranslationLocalTask.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config_translation\Plugin\Menu\LocalTask\ConfigTranslationLocalTask.
+ */
+
+namespace Drupal\config_translation\Plugin\Menu\LocalTask;
+
+use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Menu\LocalTaskDefault;
+
+/**
+ * Defines a local task plugin with a dynamic title.
+ */
+class ConfigTranslationLocalTask extends LocalTaskDefault {
+
+  /**
+   * The mapper plugin discovery service.
+   *
+   * @var \Drupal\config_translation\ConfigMapperManagerInterface
+   */
+  protected $mapperManager;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getTitle() {
+    $options = array();
+    if (!empty($this->pluginDefinition['title_context'])) {
+      $options['context'] = $this->pluginDefinition['title_context'];
+    }
+
+    // Take custom 'config_translation_plugin_id' plugin definition key to
+    // retrieve title. We need to retrieve a runtime title (as opposed to
+    // storing the title on the plugin definition for the link) because
+    // it contains translated parts that we need in the runtime language.
+    $type_name = Unicode::strtolower($this->mapperManager()->createInstance($this->pluginDefinition['config_translation_plugin_id'])->getTypeLabel());
+    return $this->t($this->pluginDefinition['title'], array('@type_name' => $type_name), $options);
+  }
+
+  /**
+   * Gets the mapper manager.
+   *
+   * @return \Drupal\config_translation\ConfigMapperManagerInterface
+   *   The mapper manager.
+   */
+  protected function mapperManager() {
+    if (!$this->mapperManager) {
+      $this->mapperManager = \Drupal::service('plugin.manager.config_translation.mapper');
+    }
+    return $this->mapperManager;
+  }
+
+}