Dashboard: Introduce Settings class to manage to the new dashbaords

library/Icinga/Web/Dashboard/Settings.php

@@ -0,0 +1,59 @@
+<?php
+
+/* Icinga Web 2 | (c) 2022 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Dashboard;
+
+use Icinga\Web\Dashboard\ItemList\DashboardHomeList;
+use Icinga\Web\Dashboard\ItemList\DashboardList;
+use Icinga\Web\Navigation\DashboardHome;
+use ipl\Html\BaseHtmlElement;
+use ipl\Web\Url;
+use ipl\Web\Widget\ActionLink;
+
+class Settings extends BaseHtmlElement
+{
+    protected $defaultAttributes = ['class' => ['dashboard-settings content']];
+
+    protected $tag = 'div';
+
+    /** @var Dashboard */
+    protected $dashboard;
+
+    public function __construct(Dashboard $dashboard)
+    {
+        $this->dashboard = $dashboard;
+    }
+
+    protected function assemble()
+    {
+        // TODO: What we should with disabled homes??
+        $activeHome = $this->dashboard->getActiveHome();
+
+        if (empty($this->dashboard->getHomes())) {
+            // TODO: No dashboard homes :( what should we render now??
+        } elseif (count($this->dashboard->getHomes()) === 1 && $activeHome->getName() === DashboardHome::DEFAULT_HOME) {
+            foreach ($activeHome->getPanes() as $pane) {
+                $pane->setHome($activeHome);
+
+                $this->addHtml(new DashboardList($pane));
+            }
+
+            $this->addHtml(new ActionLink(
+                t('Add Dashboard'),
+                Url::fromPath(Dashboard::BASE_ROUTE . '/new-dashlet'),
+                'plus',
+                [
+                    'class'                 => 'add-dashboard',
+                    'data-icinga-modal'     => true,
+                    'data-no-icinga-ajax'   => true
+                ]
+            ));
+        } else {
+            // Make a list of dashbaord homes
+            foreach ($this->dashboard->getHomes() as $home) {
+                $this->addHtml(new DashboardHomeList($home));
+            }
+        }
+    }
+}