contextual_help

contextual_help($route_name, RouteMatchInterface $route_match)

function contextual_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.contextual':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The Contextual links module gives users with the <em>Use contextual links</em> permission quick access to tasks associated with certain areas of pages on your site. For example, a menu displayed as a block has links to edit the menu and configure the block. For more information, see the <a href=":contextual">online documentation for the Contextual Links module</a>.', array(':contextual' => 'https://www.drupal.org/documentation/modules/contextual')) . '</p>';
      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Displaying contextual links') . '</dt>';
      $output .= '<dd>';
      $output .= t('Contextual links for an area on a page are displayed using a contextual links button. There are two ways to make the contextual links button visible:');
      $output .= '<ol>';
      $sample_picture = [
        '#theme' => 'image',
        '#uri' => 'core/misc/icons/bebebe/pencil.svg',
        '#alt' => t('contextual links button')
      ];
      $sample_picture = \Drupal::service('renderer')->render($sample_picture);
      $output .= '<li>' . t('Hovering over the area of interest will temporarily make the contextual links button visible (which looks like a pencil in most themes, and is normally displayed in the upper right corner of the area). The icon typically looks like this: @picture', array('@picture' => $sample_picture)) . '</li>';
      $output .= '<li>' . t('If you have the <a href=":toolbar">Toolbar module</a> enabled, clicking the contextual links button in the toolbar (which looks like a pencil) will make all contextual links buttons on the page visible. Clicking this button again will toggle them to invisible.', array(':toolbar' => (\Drupal::moduleHandler()->moduleExists('toolbar')) ? \Drupal::url('help.page', array('name' => 'toolbar')) : '#')) . '</li>';
      $output .= '</ol>';
      $output .= t('Once the contextual links button for the area of interest is visible, click the button to display the links.');
      $output .= '</dd>';
      $output .= '</dl>';
      return $output;
  }
}