lib: Support setting CSS class for li on navigation items

refs #5543

library/Icinga/Web/Navigation/NavigationItem.php

@@ -36,6 +36,13 @@ class NavigationItem implements IteratorAggregate
      */
     protected $active;
 
+    /**
+     * The CSS class used for the outer li element
+     *
+     * @var string
+     */
+    protected $cssClass;
+
     /**
      * This item's priority
      *
@@ -200,6 +207,29 @@ class NavigationItem implements IteratorAggregate
         return $this;
     }
 
+    /**
+     * Get the CSS class used for the outer li element
+     *
+     * @return  string
+     */
+    public function getCssClass()
+    {
+        return $this->cssClass;
+    }
+
+    /**
+     * Set the CSS class to use for the outer li element
+     *
+     * @param   string  $class
+     *
+     * @return  $this
+     */
+    public function setCssClass($class)
+    {
+        $this->cssClass = (string) $class;
+        return $this;
+    }
+
     /**
      * Return this item's priority
      *

library/Icinga/Web/Navigation/Renderer/NavigationRenderer.php

@@ -304,10 +304,10 @@ class NavigationRenderer implements RecursiveIterator, NavigationRendererInterfa
      */
     public function beginItemMarkup(NavigationItem $item)
     {
-        $cssClass = array(static::CSS_CLASS_ITEM);
+        $cssClasses = array(static::CSS_CLASS_ITEM);
 
         if ($item->hasChildren() && $item->getChildren()->getLayout() === Navigation::LAYOUT_DROPDOWN) {
-            $cssClass[] = static::CSS_CLASS_DROPDOWN;
+            $cssClasses[] = static::CSS_CLASS_DROPDOWN;
             $item
                 ->setAttribute('class', static::CSS_CLASS_DROPDOWN_TOGGLE)
                 ->setIcon(static::DROPDOWN_TOGGLE_ICON)
@@ -315,12 +315,16 @@ class NavigationRenderer implements RecursiveIterator, NavigationRendererInterfa
         }
 
         if ($item->getActive()) {
-            $cssClass[] = static::CSS_CLASS_ACTIVE;
+            $cssClasses[] = static::CSS_CLASS_ACTIVE;
+        }
+
+        if ($cssClass = $item->getCssClass()) {
+            $cssClasses[] = $cssClass;
         }
 
         $content = sprintf(
             '<li class="%s">',
-            join(' ', $cssClass)
+            join(' ', $cssClasses)
         );
         return $content;
     }