annotate core/lib/Drupal/Core/Plugin/ContextAwarePluginAssignmentTrait.php @ 19:fa3358dc1485 tip

Add ndrum files
author Chris Cannam
date Wed, 28 Aug 2019 13:14:47 +0100
parents 129ea1e6d783
children
rev   line source
Chris@0 1 <?php
Chris@0 2
Chris@0 3 namespace Drupal\Core\Plugin;
Chris@0 4
Chris@0 5 /**
Chris@0 6 * Handles context assignments for context-aware plugins.
Chris@0 7 */
Chris@0 8 trait ContextAwarePluginAssignmentTrait {
Chris@0 9
Chris@0 10 /**
Chris@0 11 * Ensures the t() method is available.
Chris@0 12 *
Chris@0 13 * @see \Drupal\Core\StringTranslation\StringTranslationTrait
Chris@0 14 */
Chris@0 15 abstract protected function t($string, array $args = [], array $options = []);
Chris@0 16
Chris@0 17 /**
Chris@0 18 * Wraps the context handler.
Chris@0 19 *
Chris@0 20 * @return \Drupal\Core\Plugin\Context\ContextHandlerInterface
Chris@0 21 */
Chris@0 22 protected function contextHandler() {
Chris@0 23 return \Drupal::service('context.handler');
Chris@0 24 }
Chris@0 25
Chris@0 26 /**
Chris@0 27 * Builds a form element for assigning a context to a given slot.
Chris@0 28 *
Chris@0 29 * @param \Drupal\Core\Plugin\ContextAwarePluginInterface $plugin
Chris@0 30 * The context-aware plugin.
Chris@0 31 * @param \Drupal\Component\Plugin\Context\ContextInterface[] $contexts
Chris@0 32 * An array of contexts.
Chris@0 33 *
Chris@0 34 * @return array
Chris@0 35 * A form element for assigning context.
Chris@0 36 */
Chris@0 37 protected function addContextAssignmentElement(ContextAwarePluginInterface $plugin, array $contexts) {
Chris@0 38 $element = [];
Chris@0 39 foreach ($plugin->getContextDefinitions() as $context_slot => $definition) {
Chris@0 40 $valid_contexts = $this->contextHandler()->getMatchingContexts($contexts, $definition);
Chris@0 41 $options = [];
Chris@0 42 foreach ($valid_contexts as $context_id => $context) {
Chris@0 43 $element['#tree'] = TRUE;
Chris@0 44 $options[$context_id] = $context->getContextDefinition()->getLabel();
Chris@0 45 $element[$context_slot] = [
Chris@0 46 '#type' => 'value',
Chris@0 47 '#value' => $context_id,
Chris@0 48 ];
Chris@0 49 }
Chris@0 50
Chris@17 51 // Show the context selector only if there is more than 1 option to choose
Chris@17 52 // from. Also, show if there is a single option but the plugin does not
Chris@17 53 // require a context.
Chris@17 54 if (count($options) > 1 || (count($options) == 1 && !$definition->isRequired())) {
Chris@0 55 $assignments = $plugin->getContextMapping();
Chris@0 56 $element[$context_slot] = [
Chris@0 57 '#title' => $definition->getLabel() ?: $this->t('Select a @context value:', ['@context' => $context_slot]),
Chris@0 58 '#type' => 'select',
Chris@0 59 '#options' => $options,
Chris@0 60 '#required' => $definition->isRequired(),
Chris@0 61 '#default_value' => !empty($assignments[$context_slot]) ? $assignments[$context_slot] : '',
Chris@0 62 '#description' => $definition->getDescription(),
Chris@0 63 ];
Chris@0 64 if (!$definition->isRequired()) {
Chris@0 65 $element[$context_slot]['#empty_value'] = '';
Chris@0 66 }
Chris@0 67 }
Chris@0 68 }
Chris@0 69 return $element;
Chris@0 70 }
Chris@0 71
Chris@0 72 }