added explicit classes for widgets (#3170)

src/Event/RevenueStatisticEvent.php

@@ -0,0 +1,48 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Event;
+
+use Symfony\Contracts\EventDispatcher\Event;
+
+/**
+ * Used to display the full revenue information for a certain date-range.
+ */
+final class RevenueStatisticEvent extends Event
+{
+    private $begin;
+    private $end;
+    private $revenue = 0.0;
+
+    public function __construct(?\DateTime $begin, ?\DateTime $end)
+    {
+        $this->begin = $begin;
+        $this->end = $end;
+    }
+
+    public function getBegin(): ?\DateTime
+    {
+        return $this->begin;
+    }
+
+    public function getEnd(): ?\DateTime
+    {
+        return $this->end;
+    }
+
+    public function getRevenue(): float
+    {
+        return $this->revenue;
+    }
+
+    public function addRevenue(float $revenue): void
+    {
+        $this->revenue += $revenue;
+    }
+}