class HelpBlock

Same name in other branches
  1. 8.9.x core/modules/help/src/Plugin/Block/HelpBlock.php \Drupal\help\Plugin\Block\HelpBlock
  2. 10 core/modules/help/src/Plugin/Block/HelpBlock.php \Drupal\help\Plugin\Block\HelpBlock
  3. 11.x core/modules/help/src/Plugin/Block/HelpBlock.php \Drupal\help\Plugin\Block\HelpBlock

Provides a 'Help' block.

Plugin annotation


@Block(
  id = "help_block",
  admin_label = @Translation("Help"),
  forms = {
    "settings_tray" = FALSE,
  },
)

Hierarchy

Expanded class hierarchy of HelpBlock

File

core/modules/help/src/Plugin/Block/HelpBlock.php, line 24

Namespace

Drupal\help\Plugin\Block
View source
class HelpBlock extends BlockBase implements ContainerFactoryPluginInterface {
    
    /**
     * The module handler.
     *
     * @var \Drupal\Core\Extension\ModuleHandlerInterface
     */
    protected $moduleHandler;
    
    /**
     * The current request.
     *
     * @var \Symfony\Component\HttpFoundation\Request
     */
    protected $request;
    
    /**
     * The current route match.
     *
     * @var \Drupal\Core\Routing\RouteMatchInterface
     */
    protected $routeMatch;
    
    /**
     * Creates a HelpBlock instance.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin_id for the plugin instance.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   The current request.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler.
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   The current route match.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, Request $request, ModuleHandlerInterface $module_handler, RouteMatchInterface $route_match) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->request = $request;
        $this->moduleHandler = $module_handler;
        $this->routeMatch = $route_match;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('request_stack')
            ->getCurrentRequest(), $container->get('module_handler'), $container->get('current_route_match'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function build() {
        // Do not show on a 403 or 404 page.
        if ($this->request->attributes
            ->has('exception')) {
            return [];
        }
        $build = [];
        $this->moduleHandler
            ->invokeAllWith('help', function (callable $hook, string $module) use (&$build) {
            // Don't add empty strings to $build array.
            if ($help = $hook($this->routeMatch
                ->getRouteName(), $this->routeMatch)) {
                // Convert strings to #markup render arrays so that they will XSS admin
                // filtered.
                $build[] = is_array($help) ? $help : [
                    '#markup' => $help,
                ];
            }
        });
        return $build;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheContexts() {
        return Cache::mergeContexts(parent::getCacheContexts(), [
            'route',
        ]);
    }

}

Members

Title Sort descending Modifiers Object type Summary Member alias Overriden Title Overrides
BlockBase::buildConfigurationForm public function Form constructor. Overrides PluginFormInterface::buildConfigurationForm 2
BlockPluginInterface::BLOCK_LABEL_VISIBLE constant Indicates the block label (title) should be displayed to end users.
BlockPluginTrait::$inPreview protected property Whether the plugin is being rendered in preview mode.
BlockPluginTrait::$transliteration protected property The transliteration service.
BlockPluginTrait::access public function
BlockPluginTrait::baseConfigurationDefaults protected function Returns generic default configuration for block plugins.
BlockPluginTrait::blockAccess protected function Indicates whether the block should be shown. 16
BlockPluginTrait::blockForm public function 17
BlockPluginTrait::blockSubmit public function 13
BlockPluginTrait::blockValidate public function 3
BlockPluginTrait::buildConfigurationForm public function Creates a generic configuration form for all block types. Individual
block plugins can add elements to this form by overriding
BlockBase::blockForm(). Most block plugins should not override this
method unless they need to alter the generic form elements.
Aliased as: traitBuildConfigurationForm
BlockPluginTrait::calculateDependencies public function
BlockPluginTrait::defaultConfiguration public function 19
BlockPluginTrait::getConfiguration public function 1
BlockPluginTrait::getMachineNameSuggestion public function 1
BlockPluginTrait::getPreviewFallbackString public function 3
BlockPluginTrait::label public function
BlockPluginTrait::setConfiguration public function
BlockPluginTrait::setConfigurationValue public function
BlockPluginTrait::setInPreview public function
BlockPluginTrait::setTransliteration public function Sets the transliteration service.
BlockPluginTrait::submitConfigurationForm public function Most block plugins should not override this method. To add submission
handling for a specific block type, override BlockBase::blockSubmit().
BlockPluginTrait::transliteration protected function Wraps the transliteration service.
BlockPluginTrait::validateConfigurationForm public function Most block plugins should not override this method. To add validation
for a specific block type, override BlockBase::blockValidate().
1
ContextAwarePluginAssignmentTrait::addContextAssignmentElement protected function Builds a form element for assigning a context to a given slot.
ContextAwarePluginAssignmentTrait::contextHandler protected function Wraps the context handler.
ContextAwarePluginTrait::$context protected property The data objects representing the context of this plugin.
ContextAwarePluginTrait::$initializedContextConfig protected property Tracks whether the context has been initialized from configuration.
ContextAwarePluginTrait::getCacheMaxAge public function 7
ContextAwarePluginTrait::getCacheTags public function 4
ContextAwarePluginTrait::getContext public function
ContextAwarePluginTrait::getContextDefinition public function
ContextAwarePluginTrait::getContextDefinitions public function
ContextAwarePluginTrait::getContextMapping public function
ContextAwarePluginTrait::getContexts public function
ContextAwarePluginTrait::getContextValue public function
ContextAwarePluginTrait::getContextValues public function
ContextAwarePluginTrait::getPluginDefinition abstract public function 1
ContextAwarePluginTrait::setContext public function 1
ContextAwarePluginTrait::setContextMapping public function
ContextAwarePluginTrait::setContextValue public function
ContextAwarePluginTrait::validateContexts public function
DerivativeInspectionInterface::getBaseId public function Gets the base_plugin_id of the plugin instance. 1
DerivativeInspectionInterface::getDerivativeId public function Gets the derivative_id of the plugin instance. 1
HelpBlock::$moduleHandler protected property The module handler.
HelpBlock::$request protected property The current request.
HelpBlock::$routeMatch protected property The current route match.
HelpBlock::build public function Builds and returns the renderable array for this block plugin. Overrides BlockPluginInterface::build
HelpBlock::create public static function Creates an instance of the plugin. Overrides ContainerFactoryPluginInterface::create
HelpBlock::getCacheContexts public function Overrides ContextAwarePluginTrait::getCacheContexts
HelpBlock::__construct public function Creates a HelpBlock instance. Overrides BlockPluginTrait::__construct
MessengerTrait::$messenger protected property The messenger. 17
MessengerTrait::messenger public function Gets the messenger. 17
MessengerTrait::setMessenger public function Sets the messenger.
PluginInspectionInterface::getPluginId public function Gets the plugin_id of the plugin instance. 2
PluginWithFormsTrait::getFormClass public function Implements \Drupal\Core\Plugin\PluginWithFormsInterface::getFormClass().
PluginWithFormsTrait::hasFormClass public function Implements \Drupal\Core\Plugin\PluginWithFormsInterface::hasFormClass().
StringTranslationTrait::$stringTranslation protected property The string translation service. 3
StringTranslationTrait::formatPlural protected function Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals protected function Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation protected function Gets the string translation service.
StringTranslationTrait::setStringTranslation public function Sets the string translation service to use. 2
StringTranslationTrait::t protected function Translates a string to the current language or to a given language.

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.