new routes

config/install/heartbeat8.templatelist.yml

@@ -0,0 +1 @@
+heartbeat8:

heartbeat8.links.menu.yml

@@ -25,3 +25,9 @@ entity.heartbeat_type.collection:
   parent: system.admin_structure
   weight: 99
 
+heartbeat8.template_list:
+  title: 'Heartbeat Templates'
+  description: 'All heartbeat templates'
+  parent: entity.heartbeat.collection
+  route_name: heartbeat8.templates
+  weight: 99

heartbeat8.routing.yml

@@ -6,3 +6,10 @@ heartbeat8.heartbeat_controller_confirm:
     _title: 'load'
   requirements:
     _permission: 'access content'
+heartbeat8.templates:
+  path: '/admin/structure/heartbeat/templates/list'
+  defaults:
+    _form: '\Drupal\heartbeat8\Form\TemplateList'
+    _title: 'Heartbeat Templates'
+  requirements:
+    _permission: 'administer content'

src/Form/TemplateList.php

@@ -0,0 +1,99 @@
+<?php
+
+namespace Drupal\heartbeat8\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Form\FormBuilder;
+use Symfony\Component\HttpFoundation\Request;
+use Drupal\user\UserData;
+
+/**
+ * Class TemplateList.
+ *
+ * @package Drupal\heartbeat8\Form
+ */
+class TemplateList extends FormBase {
+
+  /**
+   * Drupal\Core\Form\FormBuilder definition.
+   *
+   * @var Drupal\Core\Form\FormBuilder
+   */
+  protected $form_builder;
+
+  /**
+   * Symfony\Component\HttpFoundation\Request definition.
+   *
+   * @var Symfony\Component\HttpFoundation\Request
+   */
+  protected $request;
+
+  /**
+   * Drupal\user\UserData definition.
+   *
+   * @var Drupal\user\UserData
+   */
+  protected $user_data;
+  public function __construct(
+    FormBuilder $form_builder,
+    UserData $user_data
+  ) {
+    $this->form_builder = $form_builder;
+    $this->user_data = $user_data;
+  }
+
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('form_builder'),
+      $container->get('user.data')
+    );
+  }
+
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'template_list';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $templateNames = ['One', 'Two', 'Three', 'Four'];
+
+    foreach ($templateNames as $templateName) {
+      $form[$templateName] = array(
+        'Template' => array(
+          '#type' => 'details',
+          '#title' => t('Wut'),
+          '#collapsible' => TRUE,
+          '#collapsed' => TRUE,
+          '#states' => array(
+            'expanded' => array(
+              ':input[name="Template name"]' => array('value' => 'expand'),
+            ),
+          ),
+        ),
+        'notes' => array(
+        '#type' => 'textarea',
+        '#title' => $this->t($templateName . ' notes'),
+        '#description' => $this->t('Additional notes'),
+        )
+      );
+    }
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+
+  }
+
+}