Add ColumnChooser form

Add a new form that supports adding and removing dispalyed columns
in tabular viewmode.

library/Icingadb/Web/Control/ColumnChooser.php

@@ -0,0 +1,108 @@
+<?php
+
+/* Icinga DB Web | (c) 2026 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Web\Control;
+
+use ipl\Html\Attributes;
+use ipl\Html\HtmlElement;
+use ipl\Orm\Resolver;
+use ipl\Web\Compat\CompatForm;
+use ipl\Web\FormElement\TermInput;
+use ipl\Web\FormElement\TermInput\Term;
+use ipl\Web\Url;
+use Psr\Http\Message\ServerRequestInterface;
+
+class ColumnChooser extends CompatForm
+{
+    /** @var Url The suggestionUrl for the TermInput {@see TermInput::$suggestionUrl} */
+    protected Url $suggestionUrl;
+
+    /** @var Resolver The resolver used to validate column names and get their labels */
+    protected Resolver $resolver;
+
+    public function __construct(Url $suggestionUrl, Resolver $resolver)
+    {
+        $this->suggestionUrl = $suggestionUrl;
+        $this->resolver = $resolver;
+    }
+
+    public function getPartUpdates(): array
+    {
+        $this->ensureAssembled();
+
+        return $this->getElement('columns')->prepareMultipartUpdate($this->getRequest());
+    }
+
+    public function isValid()
+    {
+        if (! parent::isValid()) {
+            return false;
+        }
+
+        foreach ($this->getElement('columns')->getTerms() as $term) {
+            if ($term->getMessage() !== null) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Validate terms, mark invalid ones, and set labels
+     *
+     * @param Term[] $terms
+     */
+    protected function validateTermsAndSetLabels(array $terms): void
+    {
+        foreach ($terms as $term) {
+            try {
+                $columnDefinition = $this->resolver->getColumnDefinition($term->getSearchValue());
+                $label = $columnDefinition->getLabel();
+                if ($label !== null) {
+                    $term->setLabel($label);
+                }
+            } catch (\Exception) {
+                $term->setMessage($this->translate('Is not a valid column'));
+            }
+        }
+    }
+
+    /**
+     * Get the columns from the request
+     *
+     * @param ServerRequestInterface $request
+     *
+     * @return string
+     */
+    protected function getColumns(ServerRequestInterface $request): string
+    {
+        $columns = $request->getQueryParams()['columns'];
+
+        return $columns;
+    }
+    protected function assemble()
+    {
+        $termInput = (new TermInput(
+            'columns',
+            [
+                'type' => 'text',
+                'label' => $this->translate('Selected Columns'),
+            ]
+        ))
+            ->setRequired()
+            ->setVerticalTermDirection()
+            ->setReadOnly()
+            ->setOrdered()
+            ->setSuggestionUrl($this->suggestionUrl)
+            ->setValue($this->getColumns($this->getRequest()))
+            ->on(TermInput::ON_ENRICH, $this->validateTermsAndSetLabels(...))
+            ->on(TermInput::ON_ADD, $this->validateTermsAndSetLabels(...))
+            ->on(TermInput::ON_SAVE, $this->validateTermsAndSetLabels(...))
+            ->on(TermInput::ON_PASTE, $this->validateTermsAndSetLabels(...));
+
+        $this->addElement($termInput);
+        $this->addElement('submit', 'apply', ['label' => $this->translate('Apply')]);
+    }
+}