New event handler object

app/Events/Model/TransactionGroup/TransactionGroupEventObjects.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace FireflyIII\Events\Model\TransactionGroup;
+
+use Illuminate\Support\Collection;
+
+/**
+ * This class collects all objects before and after the creation, removal or updating
+ * of a transaction group. The idea is that this class contains all relevant objects.
+ * Right now, that means journals, tags, accounts, budgets and categories.
+ *
+ * By collecting these objects (in case of an update: before AND after update) there
+ * is a unified set of objects to manage: update balances, recalculate credits, etc.
+ */
+class TransactionGroupEventObjects
+{
+    public Collection $accounts;
+    public Collection $budgets;
+    public Collection $categories;
+    public Collection $tags;
+    public Collection $transactionJournals;
+
+    public function __construct() {
+        $this->accounts = new Collection();
+        $this->budgets =  new Collection();
+        $this->categories = new Collection();
+        $this->tags =new Collection();
+        $this->transactionJournals = new Collection();
+    }
+}