Warning, file /plasma/plasma-workspace/kcms/region_language/languagelistmodel.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /*
     languagelistmodel.h
     SPDX-FileCopyrightText: 2021 Han Young <hanyoung@protonmail.com>
     SPDX-FileCopyrightText: 2019 Kevin Ottens <kevin.ottens@enioka.com>
     SPDX-FileCopyrightText: 2023 Serenity Cybersecurity, LLC <license@futurecrew.ru>
                                  Author: Gleb Popov <arrowd@FreeBSD.org>
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "languagelistmodel.h"
 #include "exampleutility.h"
 #include "kcm_regionandlang_debug.h"
 #include "kcmregionandlang.h"
 #include "regionandlangsettings.h"
 
 using namespace Qt::StringLiterals;
 using namespace KCM_RegionAndLang;
 
 LanguageListModel::LanguageListModel(QObject *parent)
     : QAbstractListModel(parent)
     , m_selectedLanguageModel(new SelectedLanguageModel(this))
 {
     connect(this, &LanguageListModel::isPreviewExampleChanged, this, &LanguageListModel::exampleChanged);
     connect(m_selectedLanguageModel, &SelectedLanguageModel::exampleChanged, this, &LanguageListModel::exampleChanged);
     /* explicitly set pt to pt_PT as a workaround for GNU Gettext and CLDR treat the default dialect of 'pt' differently
      *
      * see https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/2478
      * and https://mail.kde.org/pipermail/kde-i18n-doc/2023-January/001340.html
      * for more info on the matter
      */
     auto availableLanguages = KLocalizedString::availableDomainTranslations("plasmashell");
     if (availableLanguages.contains(QStringLiteral("pt"))) {
         availableLanguages.remove(QStringLiteral("pt"));
         availableLanguages.insert(QStringLiteral("pt_PT"));
     }
 
     m_availableLanguages = availableLanguages.values();
     m_availableLanguages.sort();
     m_availableLanguages.push_front(QStringLiteral("C"));
 }
 
 int LanguageListModel::rowCount(const QModelIndex &parent) const
 {
     Q_UNUSED(parent)
     return m_availableLanguages.size();
 }
 
 QVariant LanguageListModel::data(const QModelIndex &index, int role) const
 {
     const auto row = index.row();
     if (row < 0 || row >= m_availableLanguages.size()) {
         return {};
     }
     switch (static_cast<Roles>(role)) {
     case NativeName:
         return languageCodeToName(m_availableLanguages.at(row));
     case LanguageCode:
         return m_availableLanguages.at(row);
     case Flag: {
         QString flagCode;
         const QStringList split = QLocale(m_availableLanguages.at(row)).name().split(QLatin1Char('_'));
         if (split.size() > 1) {
             flagCode = split[1].toLower();
         }
         return "image://flags/%1"_L1.arg(flagCode);
     }
     }
     Q_UNREACHABLE();
     return {};
 }
 
 QHash<int, QByteArray> LanguageListModel::roleNames() const
 {
     return {{NativeName, QByteArrayLiteral("nativeName")}, {LanguageCode, QByteArrayLiteral("languageCode")}, {Flag, QByteArrayLiteral("flag")}};
 }
 
 QString LanguageListModel::languageCodeToName(const QString &languageCode)
 {
     const QLocale locale(languageCode);
     QString languageName = locale.nativeLanguageName();
 
     if (languageName.isEmpty()) {
         return languageCode;
     }
 
     if (languageCode.contains(QLatin1Char('@'))) {
         return i18nc("%1 is language name, %2 is language code name", "%1 (%2)", languageName, languageCode);
     }
 
     // KDE languageCode got translated by QLocale to a locale code we also have on
     // the list. Currently this only happens with pt that gets translated to pt_BR.
     if (languageCode == QStringLiteral("pt_BR")) {
         return i18nc("%1 is português in system locale name, Brazil is to distinguish European português and Brazilian português", "%1 (Brazil)", languageName);
     }
 
     return languageName;
 }
 
 bool LanguageListModel::isSupportedLanguage(const QString &language) const
 {
     // If the available language list contains the full language string outright, e.g. en_US
     if (m_availableLanguages.contains(language)) {
         return true;
     }
 
     // If the language string passed has a territory attached (like fr_FR) then chop it off,
     // and try searching for just the language.
     if (language.contains('_')) {
         const QString languageName{language.left(language.indexOf('_'))};
         return m_availableLanguages.contains(languageName);
     }
 
     return false;
 }
 
 int LanguageListModel::currentIndex() const
 {
     return m_index;
 }
 
 void LanguageListModel::setCurrentIndex(int index)
 {
     if (index == m_index || index < 0 || index >= m_availableLanguages.size()) {
         return;
     }
 
     m_index = index;
     Q_EMIT exampleChanged();
 }
 
 QString LanguageListModel::exampleHelper(const std::function<QString(const QLocale &)> &func) const
 {
     if (!m_settings) {
         return {};
     }
 
     QString result = func(QLocale(m_settings->langWithFallback()));
     if (m_isPreviewExample) {
         if (m_index < 0) {
             result = func(QLocale(m_settings->langWithFallback()));
         } else {
             result = func(QLocale(m_availableLanguages[m_index]));
         }
     }
     return result;
 }
 
 QString LanguageListModel::numberExample() const
 {
     return exampleHelper(Utility::numericExample);
 }
 
 QString LanguageListModel::currencyExample() const
 {
     return exampleHelper(Utility::monetaryExample);
 }
 
 QString LanguageListModel::timeExample() const
 {
     return exampleHelper(Utility::timeExample);
 }
 
 QString LanguageListModel::paperSizeExample() const
 {
     return exampleHelper(Utility::paperSizeExample);
 }
 
 #ifdef LC_ADDRESS
 QString LanguageListModel::addressExample() const
 {
     return exampleHelper(Utility::addressExample);
 }
 
 QString LanguageListModel::nameStyleExample() const
 {
     return exampleHelper(Utility::nameStyleExample);
 }
 
 QString LanguageListModel::phoneNumbersExample() const
 {
     return exampleHelper(Utility::phoneNumbersExample);
 }
 #endif
 
 QString LanguageListModel::metric() const
 {
     return exampleHelper(Utility::measurementExample);
 }
 
 void LanguageListModel::setRegionAndLangSettings(QObject *settings, QObject *kcm)
 {
     if (auto *regionandlangsettings = qobject_cast<RegionAndLangSettings *>(settings)) {
         if (auto *regionandlangkcm = qobject_cast<KCMRegionAndLang *>(kcm)) {
             m_settings = regionandlangsettings;
             m_selectedLanguageModel->setRegionAndLangSettings(regionandlangsettings, regionandlangkcm);
             Q_EMIT exampleChanged();
         }
     }
 }
 
 bool LanguageListModel::isPreviewExample() const
 {
     return m_isPreviewExample;
 }
 
 void LanguageListModel::setIsPreviewExample(bool preview)
 {
     m_isPreviewExample = preview;
 }
 
 SelectedLanguageModel::SelectedLanguageModel(LanguageListModel *parent)
     : QAbstractListModel(parent)
     , m_parent(parent)
 {
 }
 
 void SelectedLanguageModel::setRegionAndLangSettings(RegionAndLangSettings *settings, KCMRegionAndLang *kcm)
 {
     m_settings = settings;
     m_kcm = kcm;
 
     beginResetModel();
     if (m_settings->language().isEmpty()) {
         // no language but have lang
         m_selectedLanguages = {m_settings->lang()};
     } else {
         // have language, ignore lang
         m_selectedLanguages = m_settings->language().split(QLatin1Char(':'));
     }
 
     // Chop off the UTF-8 codepoint
     for (auto &language : m_selectedLanguages) {
         language.remove(QStringLiteral(".UTF-8"));
     }
 
     if (m_settings->isDefaultSetting(SettingType::Lang) && m_settings->isDefaultSetting(SettingType::Language)) {
         m_hasImplicitLang = true;
         Q_EMIT hasImplicitLangChanged();
     }
 
     endResetModel();
 
     // check for invalid lang
     if (!m_selectedLanguages.empty() && !m_parent->isSupportedLanguage(m_selectedLanguages.front())) {
         m_unsupportedLanguage = m_selectedLanguages.front();
         Q_EMIT unsupportedLanguageChanged();
     } else if (!m_unsupportedLanguage.isEmpty()) {
         m_unsupportedLanguage.clear();
         Q_EMIT unsupportedLanguageChanged();
     }
 }
 
 SelectedLanguageModel *LanguageListModel::selectedLanguageModel() const
 {
     return m_selectedLanguageModel;
 }
 
 int SelectedLanguageModel::rowCount(const QModelIndex &parent) const
 {
     Q_UNUSED(parent)
     return m_selectedLanguages.size();
 }
 
 QVariant SelectedLanguageModel::data(const QModelIndex &index, int role) const
 {
     Q_UNUSED(role)
     const auto row = index.row();
     if (row < 0 || row > m_selectedLanguages.size()) {
         return {};
     }
     // "add Language" Item
     if (row == m_selectedLanguages.size()) {
         return {};
     }
 
     return LanguageListModel::languageCodeToName(m_selectedLanguages.at(row));
 }
 
 bool SelectedLanguageModel::shouldWarnMultipleLang() const
 {
     if (m_selectedLanguages.size() >= 2) {
         if (m_selectedLanguages.front().startsWith(QLatin1String("en_"))) {
             return true;
         }
     }
     return false;
 }
 
 void SelectedLanguageModel::move(int from, int to)
 {
     if (from == to || from < 0 || from >= m_selectedLanguages.size() || to < 0 || to >= m_selectedLanguages.size()) {
         return;
     }
 
     if (m_hasImplicitLang) {
         m_hasImplicitLang = false;
         Q_EMIT hasImplicitLangChanged();
     }
 
     beginResetModel();
     m_selectedLanguages.move(from, to);
     endResetModel();
     saveLanguages();
     Q_EMIT shouldWarnMultipleLangChanged();
     Q_EMIT exampleChanged();
 }
 
 void SelectedLanguageModel::remove(int index)
 {
     if (index < 0 || index >= m_selectedLanguages.size()) {
         return;
     }
     beginRemoveRows(QModelIndex(), index, index);
     m_selectedLanguages.removeAt(index);
     endRemoveRows();
     saveLanguages();
     Q_EMIT shouldWarnMultipleLangChanged();
     Q_EMIT exampleChanged();
 }
 
 void SelectedLanguageModel::addLanguage(const QString &lang)
 {
     if (lang.isEmpty() || m_selectedLanguages.indexOf(lang) != -1) {
         return;
     }
 
     // fix Kirigami.SwipeListItem doesn't connect to Actions' visible property.
     // Reset model enforce a refresh of delegate
     beginResetModel();
     if (m_hasImplicitLang) {
         m_hasImplicitLang = false;
         Q_EMIT hasImplicitLangChanged();
     }
     m_selectedLanguages.push_back(lang);
     endResetModel();
     saveLanguages();
     Q_EMIT shouldWarnMultipleLangChanged();
     Q_EMIT exampleChanged();
 }
 
 void SelectedLanguageModel::replaceLanguage(int index, const QString &lang)
 {
     if (index < 0 || index >= m_selectedLanguages.size() || lang.isEmpty()) {
         return;
     }
 
     int existLangIndex = m_selectedLanguages.indexOf(lang);
     // return if no change, but allow change implicit lang to explicit
     if (existLangIndex == index && !m_hasImplicitLang) {
         return;
     }
 
     beginResetModel();
     m_selectedLanguages[index] = lang;
     if (!m_hasImplicitLang) {
         // delete duplicate lang
         if (existLangIndex != -1) {
             m_selectedLanguages.removeAt(existLangIndex);
         }
     } else {
         m_hasImplicitLang = false;
         Q_EMIT hasImplicitLangChanged();
     }
     endResetModel();
     saveLanguages();
     Q_EMIT shouldWarnMultipleLangChanged();
     Q_EMIT exampleChanged();
 }
 
 void SelectedLanguageModel::saveLanguages()
 {
     // implicit lang means no change
     if (!m_settings || m_hasImplicitLang) {
         return;
     }
     if (m_selectedLanguages.empty()) {
         m_settings->setLang(m_settings->defaultLangValue());
         m_settings->config()->group(QStringLiteral("Formats")).deleteEntry("lang");
         m_settings->config()->group(QStringLiteral("Translations")).deleteEntry("language");
     } else {
         if (!m_parent->isSupportedLanguage(m_selectedLanguages.front())) {
             m_unsupportedLanguage = m_selectedLanguages.front();
             Q_EMIT unsupportedLanguageChanged();
         } else {
             if (!m_unsupportedLanguage.isEmpty()) {
                 m_unsupportedLanguage.clear();
                 Q_EMIT unsupportedLanguageChanged();
             }
 
 #ifdef GLIBC_LOCALE
             auto glibcLang = m_kcm->toGlibcLocale(m_selectedLanguages.front());
             // TODO: don't silently discard failed mappings
             if (glibcLang.has_value()) {
                 m_settings->setLang(glibcLang.value());
             }
 #else
             m_settings->setLang(m_selectedLanguages.front());
 #endif
         }
         QString languages;
         for (auto i = m_selectedLanguages.cbegin(); i != m_selectedLanguages.cend(); i++) {
             languages.push_back(*i);
             // no ':' at end
             if (i + 1 != m_selectedLanguages.cend()) {
                 languages.push_back(QLatin1Char(':'));
             }
         }
         m_settings->setLanguage(languages);
     }
 }
 
 bool SelectedLanguageModel::hasImplicitLang() const
 {
     return m_hasImplicitLang;
 }
 
 const QString &SelectedLanguageModel::unsupportedLanguage() const
 {
     return m_unsupportedLanguage;
 }