[4] Blank State for com_cache

administrator/components/com_cache/src/View/Cache/HtmlView.php

@@ -101,11 +101,16 @@ public function display($tpl = null): void
 		$this->activeFilters = $model->getActiveFilters();
 
 		// Check for errors.
-		if (count($errors = $this->get('Errors')))
+		if (\count($errors = $this->get('Errors')))
 		{
 			throw new GenericDataException(implode("\n", $errors), 500);
 		}
 
+		if (!\count($this->data))
+		{
+			$this->setLayout('emptystate');
+		}
+
 		$this->addToolbar();
 
 		parent::display($tpl);
@@ -125,10 +130,13 @@ protected function addToolbar(): void
 		// Get the toolbar object instance
 		$toolbar = Toolbar::getInstance('toolbar');
 
-		ToolbarHelper::custom('delete', 'delete', '', 'JTOOLBAR_DELETE', true);
-		ToolbarHelper::custom('deleteAll', 'remove', '', 'JTOOLBAR_DELETE_ALL', false);
-		$toolbar->appendButton('Confirm', 'COM_CACHE_RESOURCE_INTENSIVE_WARNING', 'delete', 'COM_CACHE_PURGE_EXPIRED', 'purge', false);
-		ToolbarHelper::divider();
+		if (\count($this->data))
+		{
+			ToolbarHelper::custom('delete', 'delete', '', 'JTOOLBAR_DELETE', true);
+			ToolbarHelper::custom('deleteAll', 'remove', '', 'JTOOLBAR_DELETE_ALL', false);
+			$toolbar->appendButton('Confirm', 'COM_CACHE_RESOURCE_INTENSIVE_WARNING', 'delete', 'COM_CACHE_PURGE_EXPIRED', 'purge', false);
+			ToolbarHelper::divider();
+		}
 
 		if (Factory::getUser()->authorise('core.admin', 'com_cache'))
 		{

administrator/components/com_cache/tmpl/cache/emptystate.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * @package     Joomla.Administrator
+ * @subpackage  com_cache
+ *
+ * @copyright   (C) 2021 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+defined('_JEXEC') or die;
+
+use Joomla\CMS\Layout\LayoutHelper;
+
+$displayData = [
+	'textPrefix' => 'COM_CACHE',
+	'helpURL'    => 'https://docs.joomla.org/Special:MyLanguage/Cache',
+	'icon'       => 'icon-bolt clear',
+];
+
+echo LayoutHelper::render('joomla.content.emptystate', $displayData);

administrator/language/en-GB/com_cache.ini

@@ -6,6 +6,8 @@
 COM_CACHE="Cache"
 COM_CACHE_CLEAR_CACHE="Maintenance: Clear Cache"
 COM_CACHE_CONFIGURATION="Cache: Options"
+COM_CACHE_EMPTYSTATE_CONTENT="If you enable caching in Joomla Global Configuration, then any cached items will display here as they are generated."
+COM_CACHE_EMPTYSTATE_TITLE="You have no cached content."
 COM_CACHE_ERROR_CACHE_CONNECTION_FAILED="Could not connect to the cache store to fetch the cache data."
 COM_CACHE_ERROR_CACHE_DRIVER_UNSUPPORTED="Could not read the cache data, the configured cache handler is not supported by this environment."
 COM_CACHE_EXPIRED_ITEMS_DELETE_ERROR="Error clearing cache group(s): %s."