Header: Add header to event history

Add header to the following widgets:

- FilterEditor
- SortBox

refs #7976

library/Icinga/Web/Widget/FilterEditor.php

@@ -676,9 +676,9 @@ class FilterEditor extends AbstractWidget
     public function render()
     {
         if (! $this->preservedUrl()->getParam('modifyFilter')) {
-            return $this->renderSearch() . $this->shorten($this->filter, 50);
-        }
-        return  $this->renderSearch()
+            $filterEditor = $this->renderSearch() . $this->shorten($this->filter, 50);
+        } else {
+            $filterEditor = $this->renderSearch()
                 . '<form action="'
                 . Url::fromRequest()
                 . '" class="filterEditor" method="POST">'
@@ -692,6 +692,14 @@ class FilterEditor extends AbstractWidget
                 . '</form>';
         }
 
+        return sprintf(
+            '<div class="filter-editor dontprint">'
+            . '<h2 tabindex="-1" class="sr-only">%s</h2>%s</div>',
+            t('Filters'),
+            $filterEditor
+        );
+    }
+
     protected function shorten($string, $length)
     {
         if (strlen($string) > $length) {

library/Icinga/Web/Widget/SortBox.php

@@ -133,6 +133,13 @@ class SortBox extends AbstractWidget
         if ($this->request) {
             $form->populate($this->request->getParams());
         }
-        return $form;
+
+        return sprintf(
+            '<div class="sort-box dontprint">'
+            . '<h2 tabindex="-1" class="sr-only">%s</h2>%s%s</div>',
+            t('Sort Criteria'),
+            t('Sort by'),
+            (string) $form
+        );
     }
 }

modules/monitoring/application/views/scripts/list/eventhistory.phtml

@@ -4,16 +4,10 @@ use Icinga\Module\Monitoring\Object\Host;
 use Icinga\Module\Monitoring\Object\Service;
 
 ?>
-
 <?php if (false === $this->compact): ?>
 <div class="controls">
   <?= $this->tabs ?>
-  <div style="margin: 1em" class="dontprint">
-    <div style="float: right">
-      <?= $this->translate('Sort by') ?> <?= $this->sortControl ?>
-    </div>
-  </div>
-
+  <?= $this->sortControl ?>
   <?= $this->widget('limiter', array('url' => $this->url, 'max' => $this->history->count())); ?>
   <?= $this->paginationControl($history, null, null, array('preserve' => $this->preserve)); ?>
 
@@ -22,6 +16,7 @@ use Icinga\Module\Monitoring\Object\Service;
 
 <div class="content">
 <?= $this->filterEditor ?>
+<h1 tabindex="-1"><?= $this->translate('Event History') ?></h1>
 <?php if (empty($history)): ?>
   <?= $this->translate('No history events matching the filter') ?>
 </div>

modules/monitoring/public/css/module.less

@@ -198,3 +198,7 @@ hr.command-separator {
   border: none;
   border-bottom: 2px solid @colorPetrol;
 }
+
+.sort-box {
+  float: right;
+}