use tray container for header elements

src/Entity/Browser/Header/Tray/Tab.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yggverse\Yoda\Entity\Browser\Header\Tray;
+
+use \Yggverse\Yoda\Entity\Browser\Header\Tray;
+
+class Tab
+{
+    public \GtkButton $gtk;
+
+    // Dependencies
+    public Tray $tray;
+
+    // Defaults
+    protected string $_label = '+';
+    private string $_tooltip = 'New tab';
+
+    public function __construct(
+        Tray $tray
+    ) {
+        // Init dependency
+        $this->tray = $tray;
+
+        // Init GTK
+        $this->gtk = new \GtkButton;
+
+        $this->gtk->set_label(
+            _($this->_label)
+        );
+
+        $this->gtk->set_tooltip_text(
+            _($this->_tooltip)
+        );
+
+        // Render
+        $this->gtk->show();
+
+        // Init events
+        $this->gtk->connect(
+            'clicked',
+            function(
+                \GtkButton $entity
+            ) {
+                $this->tray->header->browser->container->tab->append(
+                    null,
+                    false
+                );
+            }
+        );
+    }
+}