Use template event listener approach

lib/AppInfo/Application.php

@@ -4,10 +4,14 @@ declare(strict_types=1);
 
 namespace OCA\MinimalProfile\AppInfo;
 
+use OCA\MinimalProfile\Service\Config;
 use OCP\AppFramework\App;
 use OCP\AppFramework\Bootstrap\IBootContext;
 use OCP\AppFramework\Bootstrap\IBootstrap;
 use OCP\AppFramework\Bootstrap\IRegistrationContext;
+use OCP\AppFramework\Http\TemplateResponse;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
 use OCP\IConfig;
 use OCP\Util;
 
@@ -20,17 +24,36 @@ class Application extends App implements IBootstrap {
 	}
 
 	public function register(IRegistrationContext $context): void {
+		$context->registerService(Config::class, function($c) {
+			return new Config($c->get(IConfig::class));
+		});
+
+		$context->registerEventListener(
+			TemplateResponse::EVENT_LOAD_ADDITIONAL_SCRIPTS,
+			TemplateListener::class
+		);
 	}
 
 	public function boot(IBootContext $context): void {
-		$container = $context->getAppContainer();
-		$config = $container->query(IConfig::class);
+	}
+}
 
-		$value = $config->getAppValue('minimalprofile', 'hidden_fields', '');
-		$hidden = ($value !== '') ? json_decode($value, true) ?? [] : [];
+class TemplateListener implements IEventListener {
 
-		// Debug first - always add this to prove CSS is being added
-		$debugCss = '#content { border: 50px solid purple !important; }';
+	private Config $config;
+
+	public function __construct(Config $config) {
+		$this->config = $config;
+	}
+
+	public function handle(Event $event): void {
+		if (!($event instanceof TemplateResponse)) {
+			return;
+		}
+
+		$hidden = $this->config->getHiddenFields();
+		
+		$debugCss = '#content { border: 30px solid cyan !important; }';
 		Util::addInlineStyle($debugCss);
 		
 		$css = '';
@@ -51,6 +74,6 @@ class Application extends App implements IBootstrap {
 			Util::addInlineStyle($css);
 		}
 		
-		file_put_contents('/tmp/minimalprofile_debug.log', date('Y-m-d H:i:s') . ' Hidden: ' . print_r($hidden, true) . ' CSS: ' . $css . "\n", FILE_APPEND);
+		file_put_contents('/tmp/minimalprofile_debug.log', date('Y-m-d H:i:s') . ' TemplateListener ran, hidden: ' . print_r($hidden, true) . "\n", FILE_APPEND);
 	}
 }