UserToggles.php

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<?php
class TranslatePreferences {
    public static function onGetPreferences( $user, &$preferences ) {
        global $wgTranslateNewsletterPreference;

        if ( !$wgTranslateNewsletterPreference ) {
            return true;
        }

        global $wgEnableEmail, $wgEnotifRevealEditorAddress;

        // Only show if email is enabled and user has a confirmed email address.
        if ( $wgEnableEmail && $user->isEmailConfirmed() ) {
            // 'translate-pref-nonewsletter' is used as opt-out for
            // users with a confirmed email address
            $prefs = array(
                'translate-nonewsletter' => array(
                    'type' => 'toggle',
                    'section' => 'personal/email',
                    'label-message' => 'translate-pref-nonewsletter'
                )
            );

            // Add setting after 'enotifrevealaddr'.
            $preferences = wfArrayInsertAfter( $preferences, $prefs,
                $wgEnotifRevealEditorAddress ? 'enotifrevealaddr' : 'enotifminoredits' );
        }

        return true;
    }

    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 = Language::getLanguageNames( false );

        $preferences['translate-editlangs'] = array(
            'class' => 'HTMLJsSelectToInputField',
            '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;
    }

    public static function translationJsedit( User $user, &$preferences ) {
        $preferences['translate-jsedit'] = array(
            'class' => 'HTMLCheckField',
            'section' => 'editing/translate',
            'label-message' => 'translate-pref-jsedit',
        );

        return true;
    }

    protected static function languageSelector() {
        if ( is_callable( array( 'LanguageNames', 'getNames' ) ) ) {
            $lang = RequestContext::getMain()->getLanguage();
            $languages = LanguageNames::getNames( $lang->getCode(),
                LanguageNames::FALLBACK_NORMAL
            );
        } else {
            $languages = Language::getLanguageNames( false );
        }

        ksort( $languages );

        $selector = new XmlSelect( 'mw-language-selector', 'mw-language-selector' );
        foreach ( $languages as $code => $name ) {
            $selector->addOption( "$code - $name", $code );
        }

        $jsSelect = new JsSelectToInput( $selector );
        $jsSelect->setSourceId( 'mw-language-selector' );

        return $jsSelect;
    }
}