TranslatePreferences.php

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<?php
use MediaWiki\Extension\Translate\Utilities\HTMLJsSelectToInputField;
use MediaWiki\Extension\Translate\Utilities\JsSelectToInput;
use MediaWiki\MediaWikiServices;
 
class TranslatePreferences {
    public static function translationAssistLanguages( User $user, &$preferences ) {
        // Get selector.
        $select = self::languageSelector();
        // Set target ID.
        $select->setTargetId( 'mw-input-translate-editlangs' );
        // Get available languages.
        $languages = MediaWikiServices::getInstance()->getLanguageNameUtils()->getLanguageNames();
 
        $preferences['translate-editlangs'] = [
            'class' => HTMLJsSelectToInputField::class,
            // prefs-translate
            'section' => 'editing/translate',
            'label-message' => 'translate-pref-editassistlang',
            'help-message' => 'translate-pref-editassistlang-help',
            'select' => $select,
            'valid-values' => array_keys( $languages ),
            'name' => 'translate-editlangs',
        ];
 
        return true;
    }
 
    protected static function languageSelector() {
        $lang = RequestContext::getMain()->getLanguage();
        $languages = MediaWikiServices::getInstance()->getLanguageNameUtils()->getLanguageNames( $lang->getCode() );
        ksort( $languages );
 
        $selector = new XmlSelect( false, 'mw-language-selector' );
        foreach ( $languages as $code => $name ) {
            $selector->addOption( "$code - $name", $code );
        }
 
        $jsSelect = new JsSelectToInput( $selector );
 
        return $jsSelect;
    }
}