Apply layout styles defined in StylesController and also to editor

[MAILPOET-5540]

mailpoet/lib/EmailEditor/Engine/EmailApiController.php

@@ -0,0 +1,41 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\EmailEditor\Engine;
+
+use MailPoet\Validator\Builder;
+
+class EmailApiController {
+  /** @var StylesController */
+  private $stylesController;
+
+  public function __construct(
+    StylesController $stylesController
+  ) {
+    $this->stylesController = $stylesController;
+  }
+
+  /**
+   * @return array - Email specific data such styles.
+   */
+  public function getEmailData(): array {
+    return [
+      'layout_styles' => $this->stylesController->getEmailLayoutStyles(),
+    ];
+  }
+
+  /**
+   * Update Email specific data we store.
+   */
+  public function saveEmailData(array $data, \WP_Post $emailPost): void {
+    // Here comes code saving of Email specific data that will be passed on 'email_data' attribute
+  }
+
+  public function getEmailDataSchema(): array {
+    return Builder::object([
+      'layout_styles' => Builder::object([
+        'width' => Builder::integer(),
+        'background' => Builder::string(),
+      ]),
+    ])->toArray();
+  }
+}