Introduce Widget Flyout

library/Icinga/Web/Widget/Flyout.php

@@ -0,0 +1,57 @@
+<?php
+/* Icinga Web 2 | (c) 2022 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Web\Window;
+use ipl\Html\Attributes;
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\HtmlDocument;
+use ipl\Html\HtmlElement;
+
+class Flyout extends BaseHtmlElement
+{
+
+    protected $tag = 'div';
+
+    protected $button;
+
+    protected $mobileOnly;
+
+    protected $defaultAttributes = [
+        'class' => 'flyout-content'
+    ];
+
+    public function __construct($button = null, $mobileOnly = false)
+    {
+        $this->button = $button;
+        if ($button === null) {
+            $this->button = new HtmlElement('button', null, ['press me']);
+        }
+
+        $this->mobileOnly = $mobileOnly;
+    }
+
+    public function setButton($button)
+    {
+        $this->button = $button;
+    }
+
+    protected function assemble()
+    {
+        $wrapper = new HtmlElement('div', Attributes::create(['class' => 'flyout']));
+
+        // $uniqueID = $this->Window()->getContainerId();
+        $uniqueID = Window::generateID();
+        $wrapper->addAttributes([
+            'id' => 'icingaweb2-flyout-' . $uniqueID,
+            'class' => $this->mobileOnly ? 'mobile-only' : ''
+        ]);
+
+        $wrapper->add($this);
+
+        $html = new HtmlDocument();
+
+        $this->prependWrapper($html->addHtml($wrapper, $this->button));
+    }
+}