themeFunctions example

  public function render($row) {
    return [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#row' => $row,
      '#field_alias' => $this->field_alias ?? '',
    ];
  }

}

/** * @} */

  protected function documentSelfTokens(&$tokens) {}

  /** * {@inheritdoc} */
  public function theme(ResultRow $values) {
    $renderer = $this->getRenderer();
    $build = [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#field' => $this,
      '#row' => $values,
    ];
    $output = $renderer->render($build);

    // Set the bubbleable rendering metadata on $view->element. This ensures the     // bubbleable rendering metadata of individual rendered fields is not lost.     // @see \Drupal\Core\Render\Renderer::updateStack()     $this->view->element = $renderer->mergeBubbleableMetadata($this->view->element, $build);

    

  public function render($input) {
    // The 0, 1, 3, 4 indexes are correct. See the template_preprocess_pager()     // documentation.     $tags = [
      0 => $this->options['tags']['first'],
      1 => $this->options['tags']['previous'],
      3 => $this->options['tags']['next'],
      4 => $this->options['tags']['last'],
    ];
    return [
      '#theme' => $this->themeFunctions(),
      '#tags' => $tags,
      '#element' => $this->options['id'],
      '#parameters' => $input,
      '#quantity' => $this->options['quantity'],
      '#route_name' => !empty($this->view->live_preview) ? '<current>' : '<none>',
    ];
  }

}

// We render comment contents.       $item->description = $build;
    }
    $item->title = $comment->label();
    $item->link = $comment->toUrl('canonical', ['absolute' => TRUE])->toString();
    // Provide a reference so that the render call in     // template_preprocess_views_view_row_rss() can still access it.     $item->elements = &$comment->rss_elements;
    $item->cid = $comment->id();

    $build = [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#row' => $item,
    ];
    return $build;
  }

}

'#type' => 'checkbox',
      '#title' => $this->t('Display score'),
      '#default_value' => $this->options['score'],
    ];
  }

  /** * {@inheritdoc} */
  public function render($row) {
    return [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#row' => $row,
    ];
  }

}

/** * Renders a group of rows of the grouped view. * * @param array $rows * The result rows rendered in this group. * * @return array * The render array containing the single group theme output. */
  protected function renderRowGroup(array $rows = []) {
    return [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#rows' => $rows,
    ];
  }

  /** * Render the display in this style. */
  public function render() {
    // Group the rows according to the grouping instructions, if specified.     $sets = $this->renderGrouping(
      

    return $url;
  }

  /** * {@inheritdoc} */
  public function render() {
    $rows = (!empty($this->view->result) || $this->view->style_plugin->evenEmpty()) ? $this->view->style_plugin->render($this->view->result) : [];

    $element = [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#pre_render' => [[$this, 'elementPreRender']],
      '#rows' => $rows,
      // Assigned by reference so anything added in $element['#attached'] will       // be available on the view.       '#attached' => &$this->view->element['#attached'],
      '#cache' => &$this->view->element['#cache'],
    ];

    $this->applyDisplayCacheabilityMetadata($this->view->element);

    

$form['mapping'][$key] = $overrides + $mapping[$key] + $defaults;
    }
  }

  /** * Overrides Drupal\views\Plugin\views\style\StylePluginBase::render(). * * Provides the mapping definition as an available variable. */
  public function render() {
    return [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#rows' => $this->view->result,
      '#mapping' => $this->defineMapping(),
    ];
  }

}

if (isset($element['namespace'])) {
        $this->namespaces = array_merge($this->namespaces, $element['namespace']);
      }
    }

    foreach ($this->view->result as $row_index => $row) {
      $this->view->row_index = $row_index;
      $rows[] = $this->view->rowPlugin->render($row);
    }

    $build = [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#rows' => $rows,
    ];
    unset($this->view->row_index);
    return $build;
  }

}

  public function render() {
    $rows = [];

    foreach ($this->view->result as $row_index => $row) {
      $this->view->row_index = $row_index;
      $rows[] = $this->view->rowPlugin->render($row);
    }

    $build = [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#rows' => $rows,
    ];
    unset($this->view->row_index);
    return $build;
  }

}

/** * {@inheritdoc} */
  public function render($input) {
    // The 1, 3 indexes are correct, see template_preprocess_pager().     $tags = [
      1 => $this->options['tags']['previous'],
      3 => $this->options['tags']['next'],
    ];
    return [
      '#theme' => $this->themeFunctions(),
      '#tags' => $tags,
      '#element' => $this->options['id'],
      '#parameters' => $input,
      '#route_name' => !empty($this->view->live_preview) ? '<current>' : '<none>',
    ];
  }

}

$item['xmlUrl'] = $this->getField($row_index, $this->options['xml_url_field']);
        $item['htmlUrl'] = $this->getField($row_index, $this->options['html_url_field']);
      }
      else {
        $item['url'] = $this->getField($row_index, $this->options['url_field']);
      }
    }
    // Remove empty attributes.     $item = array_filter($item);

    $build = [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#row' => $item,
      '#field_alias' => $this->field_alias ?? '',
    ];
    return $build;
  }

  /** * Retrieves a views field value from the style plugin. * * @param $index * The index count of the row as expected by views_plugin_style::getField(). * @param $field_id * The ID assigned to the required field in the display. * * @return string * The rendered field value. */

  }

  public function render() {
    $rows = [];
    foreach ($this->view->result as $row) {
      // @todo: Include separator as an option.       $rows[] = $row;
    }

    return [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#rows' => $rows,
    ];
  }

}

if ($display_mode != 'title') {
      // We render node contents.       $item->description = $build;
    }
    $item->title = $node->label();
    $item->link = $node->toUrl('canonical', ['absolute' => TRUE])->toString();
    // Provide a reference so that the render call in     // template_preprocess_views_view_row_rss() can still access it.     $item->elements = &$node->rss_elements;
    $item->nid = $node->id();
    $build = [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#row' => $item,
    ];

    return $build;
  }

}

    $row_index++;

    foreach ($item->elements as $element) {
      if (isset($element['namespace'])) {
        $this->view->style_plugin->namespaces = array_merge($this->view->style_plugin->namespaces, $element['namespace']);
      }
    }

    $build = [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#row' => $item,
      '#field_alias' => $this->field_alias ?? '',
    ];

    return $build;
  }

  /** * Retrieves a views field value from the style plugin. * * @param $index * The index count of the row as expected by views_plugin_style::getField(). * @param $field_id * The ID assigned to the required field in the display. * * @return string|null|\Drupal\Component\Render\MarkupInterface * An empty string if there is no style plugin, or the field ID is empty. * NULL if the field value is empty. If neither of these conditions apply, * a MarkupInterface object containing the rendered field value. */