Add read-only preview for question sets

administrator/components/com_testquestions/src/View/Preview/HtmlView.php

@@ -7,11 +7,13 @@ defined('_JEXEC') or die;
 use Joomla\CMS\Factory;
 use Joomla\CMS\Language\Text;
 use Joomla\CMS\MVC\View\HtmlView as BaseHtmlView;
+use Joomla\CMS\Router\Route;
 use Joomla\CMS\Toolbar\ToolbarHelper;
 
 class HtmlView extends BaseHtmlView
 {
     protected $items = [];
+    protected $set;
 
     public function display($tpl = null)
     {
@@ -21,12 +23,19 @@ class HtmlView extends BaseHtmlView
         }
 
         $this->items = $this->get('Items');
+        $this->set = $this->get('Set');
         $this->getDocument()->getWebAssetManager()->registerAndUseStyle(
             'com_testquestions.exam',
             'media/com_testquestions/egzamin.css'
         );
         ToolbarHelper::title(Text::_('COM_TESTQUESTIONS_PREVIEW_TITLE'));
-        ToolbarHelper::link('index.php?option=com_testquestions&view=questions', 'COM_TESTQUESTIONS', 'arrow-left');
+        ToolbarHelper::link(
+            $this->set
+                ? Route::_('index.php?option=com_testquestions&task=set.edit&id=' . (int) $this->set->id)
+                : Route::_('index.php?option=com_testquestions&view=questions'),
+            $this->set ? 'COM_TESTQUESTIONS_EDIT_SET' : 'COM_TESTQUESTIONS',
+            'arrow-left'
+        );
 
         return parent::display($tpl);
     }