trait DescriptionTemplateTrait

Same name and namespace in other branches
  1. 4.0.x src/Utility/DescriptionTemplateTrait.php \Drupal\examples\Utility\DescriptionTemplateTrait

Trait to implement a "drop-in" template for Example's controllers.

This is a simple utility trait to allow our example modules to put their explanatory text into a twig template, and pass any variables needed for the template. By default, the template will be named 'description.html.twig, and should be placed in the module's templates/ directory.

These templates should be localizable as is usual for Drupal's Twig templates, using the {% trans } and {% endtrans %} tags to block out the text that needs to be passed to the translator. Modules using this trait should:

  • Implement the getModuleName() member function.
  • Override the getDescriptionVariables() member function in order to pass variables to Twig needed to render your template.

Hierarchy

See also

\Drupal\Core\Render\Element\InlineTemplate

https://www.drupal.org/developing/api/8/localization

17 files declare their use of DescriptionTemplateTrait
AjaxExampleController.php in modules/ajax_example/src/Controller/AjaxExampleController.php
BlockExampleController.php in modules/block_example/src/Controller/BlockExampleController.php
FieldExampleController.php in modules/field_example/src/Controller/FieldExampleController.php
HooksExampleController.php in modules/hooks_example/src/Controller/HooksExampleController.php
JsExampleController.php in modules/js_example/src/Controller/JsExampleController.php

... See full list

File

src/Utility/DescriptionTemplateTrait.php, line 26

Namespace

Drupal\examples\Utility
View source 
trait DescriptionTemplateTrait {
    
    /**
     * Generate a render array with our templated content.
     *
     * @return array
     *   A render array.
     */
    public function description() {
        $template_path = $this->getDescriptionTemplatePath();
        $template = file_get_contents($template_path);
        $build = [
            'description' => [
                '#type' => 'inline_template',
                '#template' => $template,
                '#context' => $this->getDescriptionVariables(),
            ],
        ];
        return $build;
    }
    
    /**
     * Name of our module.
     *
     * @return string
     *   A module name.
     */
    protected abstract function getModuleName();
    
    /**
     * Variables to act as context to the twig template file.
     *
     * @return array
     *   Associative array that defines context for a template.
     */
    protected function getDescriptionVariables() {
        $variables = [
            'module' => $this->getModuleName(),
        ];
        return $variables;
    }
    
    /**
     * Get full path to the template.
     *
     * @return string
     *   Path string.
     */
    protected function getDescriptionTemplatePath() {
        return \Drupal::service('extension.list.module')->getPath($this->getModuleName()) . '/templates/description.html.twig';
    }

}

Members

Title Modifiers Object type Summary Overrides
DescriptionTemplateTrait::description public function Generate a render array with our templated content.
DescriptionTemplateTrait::getDescriptionTemplatePath protected function Get full path to the template.
DescriptionTemplateTrait::getDescriptionVariables protected function Variables to act as context to the twig template file. 1
DescriptionTemplateTrait::getModuleName abstract protected function Name of our module. 17