class AdvancedSettingsForm

class AdvancedSettingsForm extends ConfigFormBase {
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'views_ui_admin_settings_advanced';
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getEditableConfigNames() {
        return [
            'views.settings',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form = parent::buildForm($form, $form_state);
        $config = $this->config('views.settings');
        $form['cache'] = [
            '#type' => 'details',
            '#title' => $this->t('Caching'),
            '#open' => TRUE,
        ];
        $form['cache']['clear_cache'] = [
            '#type' => 'submit',
            '#value' => $this->t("Clear Views' cache"),
            '#submit' => [
                '::cacheSubmit',
            ],
        ];
        $form['debug'] = [
            '#type' => 'details',
            '#title' => $this->t('Debugging'),
            '#open' => TRUE,
        ];
        $form['debug']['sql_signature'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('Add Views signature to all SQL queries'),
            '#description' => $this->t("All Views-generated queries will include the name of the views and display 'view-name:display-name' as a string at the end of the SELECT clause. This makes identifying Views queries in database server logs simpler, but should only be used when troubleshooting."),
            '#default_value' => $config->get('sql_signature'),
        ];
        $options = Views::fetchPluginNames('display_extender');
        if (!empty($options)) {
            $form['extenders'] = [
                '#type' => 'details',
                '#title' => $this->t('Display extenders'),
                '#open' => TRUE,
            ];
            $form['extenders']['display_extenders'] = [
                '#default_value' => array_filter($config->get('display_extenders')),
                '#options' => $options,
                '#type' => 'checkboxes',
                '#description' => $this->t('Select extensions of the views interface.'),
            ];
        }
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $this->config('views.settings')
            ->set('sql_signature', $form_state->getValue('sql_signature'))
            ->set('display_extenders', $form_state->getValue('display_extenders', []))
            ->save();
        parent::submitForm($form, $form_state);
    }
    
    /**
     * Submission handler to clear the Views cache.
     */
    public function cacheSubmit() {
        views_invalidate_cache();
        $this->messenger()
            ->addStatus($this->t('The cache has been cleared.'));
    }

}