Add a body class when the small-elements feature is enabled (#300)

* Add body class if small-elements feature enabled

* Add a null check

(cherry picked from commit 29464a9)

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 Versions and bullets are arranged chronologically from latest to oldest.
 
+## Unreleased
+
+- `fw-legacy-small-elements` class is now added to the body element when the feature is enabled.
+
 ## v1.10.0
 
 - Added paddings to the syntaxhighlight box. (https://github.com/femiwiki/FemiwikiSkin/issues/288)

includes/SmallElementsHooks.php

@@ -2,7 +2,12 @@
 
 namespace MediaWiki\Skins\Femiwiki;
 
-class SmallElementsHooks implements \MediaWiki\Preferences\Hook\GetPreferencesHook {
+use MediaWiki\MediaWikiServices;
+
+class SmallElementsHooks implements
+	\MediaWiki\Preferences\Hook\GetPreferencesHook,
+	\MediaWiki\Hook\OutputPageBodyAttributesHook
+	{
 	/**
 	 * @inheritDoc
 	 */
@@ -27,4 +32,22 @@ public function onGetPreferences( $user, &$preferences ) {
 			$preferences += $newPrefs;
 		}
 	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function onOutputPageBodyAttributes( $out, $sk, &$bodyAttrs ): void {
+		$user = $sk->getUser();
+		$registered = $user->isRegistered();
+		$config = $sk->getConfig();
+		$userOptionsLookup = MediaWikiServices::getInstance()->getUserOptionsLookup();
+
+		if (
+			( !$registered && $config->get( Constants::CONFIG_KEY_SMALL_ELEMENTS_FOR_ANONYMOUS_USER ) )
+			|| ( $registered && $userOptionsLookup->getOption( $user, Constants::PREF_KEY_LARGER_ELEMENTS, '0' ) === '0' )
+			) {
+			$bodyAttrs['class'] = $bodyAttrs['class'] ?? '';
+			$bodyAttrs['class'] .= ' fw-legacy-small-elements';
+		}
+	}
 }

skin.json

@@ -190,7 +190,8 @@
     "ResourceLoaderGetConfigVars": "MediaWiki\\Skins\\Femiwiki\\Hooks::onResourceLoaderGetConfigVars",
     "UserMailerTransformContent": "MediaWiki\\Skins\\Femiwiki\\Hooks::onUserMailerTransformContent",
     "SkinTemplateNavigation": "MediaWiki\\Skins\\Femiwiki\\Hooks::onSkinTemplateNavigation",
-    "GetPreferences": "SmallElements"
+    "GetPreferences": "SmallElements",
+    "OutputPageBodyAttributes": "SmallElements"
   },
   "config": {
     "FemiwikiFirebaseKey": { "value": "" },