You are here

Home » API reference » Drupal 9 » FilterAlign.php

class FilterAlign in Drupal 9

Same name and namespace in other branches
  1. 8 core/modules/filter/src/Plugin/Filter/FilterAlign.php \Drupal\filter\Plugin\Filter\FilterAlign

Provides a filter to align elements.

Plugin annotation


@Filter(
  id = "filter_align",
  title = @Translation("Align images"),
  description = @Translation("Uses a <code>data-align</code> attribute on <code>&lt;img&gt;</code> tags to align images."),
  type = Drupal\filter\Plugin\FilterInterface::TYPE_TRANSFORM_REVERSIBLE
)

Hierarchy

Expanded class hierarchy of FilterAlign

File

core/modules/filter/src/Plugin/Filter/FilterAlign.php, line 19

Namespace

Drupal\filter\Plugin\Filter
View source 
class FilterAlign extends FilterBase {

  /**
   * {@inheritdoc}
   */
  public function process($text, $langcode) {
    $result = new FilterProcessResult($text);
    if (stristr($text, 'data-align') !== FALSE) {
      $dom = Html::load($text);
      $xpath = new \DOMXPath($dom);
      foreach ($xpath
        ->query('//*[@data-align]') as $node) {

        // Read the data-align attribute's value, then delete it.
        $align = $node
          ->getAttribute('data-align');
        $node
          ->removeAttribute('data-align');

        // If one of the allowed alignments, add the corresponding class.
        if (in_array($align, [
          'left',
          'center',
          'right',
        ])) {
          $classes = $node
            ->getAttribute('class');
          $classes = strlen($classes) > 0 ? explode(' ', $classes) : [];
          $classes[] = 'align-' . $align;
          $node
            ->setAttribute('class', implode(' ', $classes));
        }
      }
      $result
        ->setProcessedText(Html::serialize($dom));
    }
    return $result;
  }

  /**
   * {@inheritdoc}
   */
  public function tips($long = FALSE) {
    if ($long) {
      return $this
        ->t('
        <p>You can align images, videos, blockquotes and so on to the left, right or center. Examples:</p>
        <ul>
          <li>Align an image to the left: <code>&lt;img src="" data-align="left" /&gt;</code></li>
          <li>Align an image to the center: <code>&lt;img src="" data-align="center" /&gt;</code></li>
          <li>Align an image to the right: <code>&lt;img src="" data-align="right" /&gt;</code></li>
          <li>… and you can apply this to other elements as well: <code>&lt;video src="" data-align="center" /&gt;</code></li>
        </ul>');
    }
    else {
      return $this
        ->t('You can align images (<code>data-align="center"</code>), but also videos, blockquotes, and so on.');
    }
  }

}

Members

Namesort descending Modifiers Type Description Overrides
DependencySerializationTrait::$_entityStorages protected property
DependencySerializationTrait::$_serviceIds protected property
DependencySerializationTrait::__sleep public function 2
DependencySerializationTrait::__wakeup public function 2
FilterAlign::process public function Performs the filter processing. Overrides FilterInterface::process
FilterAlign::tips public function Generates a filter's tip. Overrides FilterBase::tips
FilterBase::$provider public property The name of the provider that owns this filter.
FilterBase::$settings public property An associative array containing the configured settings of this filter.
FilterBase::$status public property A Boolean indicating whether this filter is enabled.
FilterBase::$weight public property The weight of this filter compared to others in a filter collection.
FilterBase::calculateDependencies public function Calculates dependencies for the configured plugin. Overrides DependentPluginInterface::calculateDependencies 1
FilterBase::defaultConfiguration public function Gets default configuration for this plugin. Overrides ConfigurableInterface::defaultConfiguration
FilterBase::getConfiguration public function Gets this plugin's configuration. Overrides ConfigurableInterface::getConfiguration
FilterBase::getDescription public function Returns the administrative description for this filter plugin. Overrides FilterInterface::getDescription
FilterBase::getHTMLRestrictions public function Returns HTML allowed by this filter's configuration. Overrides FilterInterface::getHTMLRestrictions 4
FilterBase::getLabel public function Returns the administrative label for this filter plugin. Overrides FilterInterface::getLabel
FilterBase::getType public function Returns the processing type of this filter plugin. Overrides FilterInterface::getType
FilterBase::prepare public function Prepares the text for processing. Overrides FilterInterface::prepare
FilterBase::setConfiguration public function Sets the configuration for this plugin instance. Overrides ConfigurableInterface::setConfiguration 1
FilterBase::settingsForm public function Generates a filter's settings form. Overrides FilterInterface::settingsForm 3
FilterBase::__construct public function Constructs a \Drupal\Component\Plugin\PluginBase object. Overrides PluginBase::__construct 4
FilterInterface::TYPE_HTML_RESTRICTOR constant HTML tag and attribute restricting filters to prevent XSS attacks.
FilterInterface::TYPE_MARKUP_LANGUAGE constant Non-HTML markup language filters that generate HTML.
FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE constant Irreversible transformation filters.
FilterInterface::TYPE_TRANSFORM_REVERSIBLE constant Reversible transformation filters.
MessengerTrait::$messenger protected property The messenger. 27
MessengerTrait::messenger public function Gets the messenger. 27
MessengerTrait::setMessenger public function Sets the messenger.
PluginBase::$configuration protected property Configuration information passed into the plugin. 1
PluginBase::$pluginDefinition protected property The plugin implementation definition. 1
PluginBase::$pluginId protected property The plugin_id.
PluginBase::DERIVATIVE_SEPARATOR constant A string which is used to separate base plugin IDs from the derivative ID.
PluginBase::getBaseId public function Gets the base_plugin_id of the plugin instance. Overrides DerivativeInspectionInterface::getBaseId
PluginBase::getDerivativeId public function Gets the derivative_id of the plugin instance. Overrides DerivativeInspectionInterface::getDerivativeId
PluginBase::getPluginDefinition public function Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition 2
PluginBase::getPluginId public function Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
PluginBase::isConfigurable public function Determines if the plugin is configurable.
StringTranslationTrait::$stringTranslation protected property The string translation service. 4
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.