Adds a ViewpointDecorationEventData class for hooks that want to provide a specific hook for scene manipulation.

src/Events/ViewpointDecorationEventData.php

@@ -0,0 +1,37 @@
+<?php
+declare(strict_types=1);
+
+namespace LotGD\Core\Events;
+
+
+use LotGD\Core\Exceptions\ArgumentException;
+use LotGD\Core\Models\Viewpoint;
+
+class ViewpointDecorationEventData extends EventContextData
+{
+    /**
+     * ViewpointDecorationEventData constructor.
+     * @param array $data Must contain field viewpoint.
+     * @throws ArgumentException
+     */
+    protected function __construct(array $data)
+    {
+        $mustHaveForm = ["viewpoint"];
+        $doesHaveForm = array_keys($data);
+        sort($mustHaveForm); sort($doesHaveForm);
+
+        if ($doesHaveForm !== $mustHaveForm) {
+            throw new ArgumentException("A new ViewpointDecoration event must have a viewpoint..");
+        }
+
+        if ($data["viewpoint"] instanceof Viewpoint === false) {
+            throw new ArgumentException(sprintf(
+                "data[viewpoint] must be an instance of %s, %s given.",
+                Viewpoint::class,
+                get_class($data["viewpoint"])
+            ));
+        }
+
+        parent::__construct($data);
+    }
+}