1 files changed, 506 insertions, 10 deletions

diff --git a/src/gui/platform/unix/qgenericunixthemes.cpp b/src/gui/platform/unix/qgenericunixthemes.cpp
index d90d5de098..ce729a74a3 100644
--- a/src/gui/platform/unix/qgenericunixthemes.cpp
+++ b/src/gui/platform/unix/qgenericunixthemes.cpp
@@ -1,4 +1,4 @@
-// Copyright (C) 2016 The Qt Company Ltd.
+// Copyright (C) 2022 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
 #include "qgenericunixthemes_p.h"
@@ -33,6 +33,12 @@
 #include <QDBusConnectionInterface>
 #include <private/qdbusplatformmenu_p.h>
 #include <private/qdbusmenubar_p.h>
+#include <private/qflatmap_p.h>
+#include <QJsonDocument>
+#include <QJsonArray>
+#include <QJsonObject>
+#include <QJsonValue>
+#include <QJsonParseError>
 #endif
 #if !defined(QT_NO_DBUS) && !defined(QT_NO_SYSTEMTRAYICON)
 #include <private/qdbustrayicon_p.h>
@@ -41,6 +47,9 @@
 #include <algorithm>
 
 QT_BEGIN_NAMESPACE
+#ifndef QT_NO_DBUS
+Q_LOGGING_CATEGORY(lcQpaThemeDBus, "qt.qpa.theme.dbus")
+#endif
 
 using namespace Qt::StringLiterals;
 
@@ -74,7 +83,7 @@ static bool isDBusTrayAvailable() {
     static bool dbusTrayAvailableKnown = false;
     if (!dbusTrayAvailableKnown) {
         QDBusMenuConnection conn;
-        if (conn.isStatusNotifierHostRegistered())
+        if (conn.isWatcherRegistered())
             dbusTrayAvailable = true;
         dbusTrayAvailableKnown = true;
         qCDebug(qLcTray) << "D-Bus tray available:" << dbusTrayAvailable;
@@ -83,6 +92,20 @@ static bool isDBusTrayAvailable() {
 }
 #endif
 
+static QString mouseCursorTheme()
+{
+    static QString themeName = qEnvironmentVariable("XCURSOR_THEME");
+    return themeName;
+}
+
+static QSize mouseCursorSize()
+{
+    constexpr int defaultCursorSize = 24;
+    static const int xCursorSize = qEnvironmentVariableIntValue("XCURSOR_SIZE");
+    static const int s = xCursorSize > 0 ? xCursorSize : defaultCursorSize;
+    return QSize(s, s);
+}
+
 #ifndef QT_NO_DBUS
 static bool checkDBusGlobalMenuAvailable()
 {
@@ -98,7 +121,288 @@ static bool isDBusGlobalMenuAvailable()
     static bool dbusGlobalMenuAvailable = checkDBusGlobalMenuAvailable();
     return dbusGlobalMenuAvailable;
 }
+
+/*!
+ * \internal
+ * The QGenericUnixThemeDBusListener class listens to the SettingChanged DBus signal
+ * and translates it into combinations of the enums \c Provider and \c Setting.
+ * Upon construction, it logs success/failure of the DBus connection.
+ *
+ * The signal settingChanged delivers the normalized setting type and the new value as a string.
+ * It is emitted on known setting types only.
+ */
+
+class QGenericUnixThemeDBusListener : public QObject
+{
+    Q_OBJECT
+
+public:
+
+    enum class Provider {
+        Kde,
+        Gtk,
+        Gnome,
+    };
+    Q_ENUM(Provider)
+
+    enum class Setting {
+        Theme,
+        ApplicationStyle,
+        ColorScheme,
+    };
+    Q_ENUM(Setting)
+
+    QGenericUnixThemeDBusListener();
+    QGenericUnixThemeDBusListener(const QString &service, const QString &path,
+                                  const QString &interface, const QString &signal);
+
+private Q_SLOTS:
+    void onSettingChanged(const QString &location, const QString &key, const QDBusVariant &value);
+
+Q_SIGNALS:
+    void settingChanged(QGenericUnixThemeDBusListener::Provider provider,
+                        QGenericUnixThemeDBusListener::Setting setting,
+                        const QString &value);
+
+private:
+    struct DBusKey
+    {
+        QString location;
+        QString key;
+        DBusKey(const QString &loc, const QString &k) : location(loc), key(k) {};
+        bool operator<(const DBusKey &other) const
+        {
+            return location + key < other.location + other.key;
+        }
+    };
+
+    struct ChangeSignal
+    {
+        Provider provider;
+        Setting setting;
+        ChangeSignal(Provider p, Setting s) : provider(p), setting(s) {}
+        ChangeSignal() {}
+    };
+
+    // Json keys
+    static constexpr QLatin1StringView s_dbusLocation = QLatin1StringView("DBusLocation");
+    static constexpr QLatin1StringView s_dbusKey = QLatin1StringView("DBusKey");
+    static constexpr QLatin1StringView s_provider = QLatin1StringView("Provider");
+    static constexpr QLatin1StringView s_setting = QLatin1StringView("Setting");
+    static constexpr QLatin1StringView s_signals = QLatin1StringView("DbusSignals");
+    static constexpr QLatin1StringView s_root = QLatin1StringView("Qt.qpa.DBusSignals");
+
+    QFlatMap <DBusKey, ChangeSignal> m_signalMap;
+
+    void init(const QString &service, const QString &path,
+              const QString &interface, const QString &signal);
+
+    std::optional<ChangeSignal> findSignal(const QString &location, const QString &key) const;
+    void populateSignalMap();
+    void loadJson(const QString &fileName);
+    void saveJson(const QString &fileName) const;
+};
+
+QGenericUnixThemeDBusListener::QGenericUnixThemeDBusListener(const QString &service,
+                               const QString &path, const QString &interface, const QString &signal)
+{
+    init (service, path, interface, signal);
+}
+
+QGenericUnixThemeDBusListener::QGenericUnixThemeDBusListener()
+{
+    static constexpr QLatin1StringView service("");
+    static constexpr QLatin1StringView path("/org/freedesktop/portal/desktop");
+    static constexpr QLatin1StringView interface("org.freedesktop.portal.Settings");
+    static constexpr QLatin1StringView signal("SettingChanged");
+
+    init (service, path, interface, signal);
+}
+
+void QGenericUnixThemeDBusListener::init(const QString &service, const QString &path,
+          const QString &interface, const QString &signal)
+{
+    QDBusConnection dbus = QDBusConnection::sessionBus();
+    const bool dBusRunning = dbus.isConnected();
+    bool dBusSignalConnected = false;
+#define LOG service << path << interface << signal;
+
+    if (dBusRunning) {
+        populateSignalMap();
+        qRegisterMetaType<QDBusVariant>();
+        dBusSignalConnected = dbus.connect(service, path, interface, signal, this,
+                              SLOT(onSettingChanged(QString,QString,QDBusVariant)));
+    }
+
+    if (dBusSignalConnected) {
+        // Connection successful
+        qCDebug(lcQpaThemeDBus) << LOG;
+    } else {
+        if (dBusRunning) {
+            // DBus running, but connection failed
+            qCWarning(lcQpaThemeDBus) << "DBus connection failed:" << LOG;
+        } else {
+            // DBus not running
+            qCWarning(lcQpaThemeDBus) << "Session DBus not running.";
+        }
+        qCWarning(lcQpaThemeDBus) << "Application will not react to setting changes.\n"
+                                  << "Check your DBus installation.";
+    }
+#undef LOG
+}
+
+void QGenericUnixThemeDBusListener::loadJson(const QString &fileName)
+{
+    Q_ASSERT(!fileName.isEmpty());
+#define CHECK(cond, warning)\
+    if (!cond) {\
+        qCWarning(lcQpaThemeDBus) << fileName << warning << "Falling back to default.";\
+        return;\
+    }
+
+#define PARSE(var, enumeration, string)\
+    enumeration var;\
+    {\
+        bool success;\
+        const int val = QMetaEnum::fromType<enumeration>().keyToValue(string.toLatin1(), &success);\
+        CHECK(success, "Parse Error: Invalid value" << string << "for" << #var);\
+        var = static_cast<enumeration>(val);\
+    }
+
+    QFile file(fileName);
+    CHECK(file.exists(), fileName << "doesn't exist.");
+    CHECK(file.open(QIODevice::ReadOnly), "could not be opened for reading.");
+
+    QJsonParseError error;
+    QJsonDocument doc = QJsonDocument::fromJson(file.readAll(), &error);
+    CHECK((error.error == QJsonParseError::NoError), error.errorString());
+    CHECK(doc.isObject(), "Parse Error: Expected root object" << s_root);
+
+    const QJsonObject &root = doc.object();
+    CHECK(root.contains(s_root), "Parse Error: Expected root object" << s_root);
+    CHECK(root[s_root][s_signals].isArray(), "Parse Error: Expected array" << s_signals);
+
+    const QJsonArray &sigs = root[s_root][s_signals].toArray();
+    CHECK((sigs.count() > 0), "Parse Error: Found empty array" << s_signals);
+
+    for (auto sig = sigs.constBegin(); sig != sigs.constEnd(); ++sig) {
+        CHECK(sig->isObject(), "Parse Error: Expected object array" << s_signals);
+        const QJsonObject &obj = sig->toObject();
+        CHECK(obj.contains(s_dbusLocation), "Parse Error: Expected key" << s_dbusLocation);
+        CHECK(obj.contains(s_dbusKey), "Parse Error: Expected key" << s_dbusKey);
+        CHECK(obj.contains(s_provider), "Parse Error: Expected key" << s_provider);
+        CHECK(obj.contains(s_setting), "Parse Error: Expected key" << s_setting);
+        const QString &location = obj[s_dbusLocation].toString();
+        const QString &key = obj[s_dbusKey].toString();
+        const QString &providerString = obj[s_provider].toString();
+        const QString &settingString = obj[s_setting].toString();
+        PARSE(provider, Provider, providerString);
+        PARSE(setting, Setting, settingString);
+        const DBusKey dkey(location, key);
+        CHECK (!m_signalMap.contains(dkey), "Duplicate key" << location << key);
+        m_signalMap.insert(dkey, ChangeSignal(provider, setting));
+    }
+#undef PARSE
+#undef CHECK
+
+    if (m_signalMap.count() > 0)
+        qCInfo(lcQpaThemeDBus) << "Successfully imported" << fileName;
+    else
+        qCWarning(lcQpaThemeDBus) << "No data imported from" << fileName << "falling back to default.";
+
+#ifdef QT_DEBUG
+    const int count = m_signalMap.count();
+    if (count == 0)
+        return;
+
+    qCDebug(lcQpaThemeDBus) << "Listening to" << count << "signals:";
+    for (auto it = m_signalMap.constBegin(); it != m_signalMap.constEnd(); ++it) {
+        qDebug() << it.key().key << it.key().location << "mapped to"
+                 << it.value().provider << it.value().setting;
+    }
+
 #endif
+}
+
+void QGenericUnixThemeDBusListener::saveJson(const QString &fileName) const
+{
+    Q_ASSERT(!m_signalMap.isEmpty());
+    Q_ASSERT(!fileName.isEmpty());
+    QFile file(fileName);
+    if (!file.open(QIODevice::WriteOnly)) {
+        qCWarning(lcQpaThemeDBus) << fileName << "could not be opened for writing.";
+        return;
+    }
+
+    QJsonArray sigs;
+    for (auto sig = m_signalMap.constBegin(); sig != m_signalMap.constEnd(); ++sig) {
+        const DBusKey &dkey = sig.key();
+        const ChangeSignal &csig = sig.value();
+        QJsonObject obj;
+        obj[s_dbusLocation] = dkey.location;
+        obj[s_dbusKey] = dkey.key;
+        obj[s_provider] = QLatin1StringView(QMetaEnum::fromType<Provider>()
+                                            .valueToKey(static_cast<int>(csig.provider)));
+        obj[s_setting] = QLatin1StringView(QMetaEnum::fromType<Setting>()
+                                           .valueToKey(static_cast<int>(csig.setting)));
+        sigs.append(obj);
+    }
+    QJsonObject obj;
+    obj[s_signals] = sigs;
+    QJsonObject root;
+    root[s_root] = obj;
+    QJsonDocument doc(root);
+    file.write(doc.toJson());
+    file.close();
+}
+
+void QGenericUnixThemeDBusListener::populateSignalMap()
+{
+    m_signalMap.clear();
+    const QString &loadJsonFile = qEnvironmentVariable("QT_QPA_DBUS_SIGNALS");
+    if (!loadJsonFile.isEmpty())
+        loadJson(loadJsonFile);
+    if (!m_signalMap.isEmpty())
+        return;
+
+    m_signalMap.insert(DBusKey("org.kde.kdeglobals.KDE"_L1, "widgetStyle"_L1),
+                       ChangeSignal(Provider::Kde, Setting::ApplicationStyle));
+
+    m_signalMap.insert(DBusKey("org.kde.kdeglobals.General"_L1, "ColorScheme"_L1),
+                       ChangeSignal(Provider::Kde, Setting::Theme));
+
+    m_signalMap.insert(DBusKey("org.gnome.desktop.interface"_L1, "gtk-theme"_L1),
+                       ChangeSignal(Provider::Gtk, Setting::Theme));
+
+    m_signalMap.insert(DBusKey("org.freedesktop.appearance"_L1, "color-scheme"_L1),
+                       ChangeSignal(Provider::Gnome, Setting::ColorScheme));
+
+    const QString &saveJsonFile = qEnvironmentVariable("QT_QPA_DBUS_SIGNALS_SAVE");
+    if (!saveJsonFile.isEmpty())
+        saveJson(saveJsonFile);
+}
+
+std::optional<QGenericUnixThemeDBusListener::ChangeSignal>
+    QGenericUnixThemeDBusListener::findSignal(const QString &location, const QString &key) const
+{
+    const DBusKey dkey(location, key);
+    std::optional<QGenericUnixThemeDBusListener::ChangeSignal> ret;
+    if (m_signalMap.contains(dkey))
+        ret.emplace(m_signalMap.value(dkey));
+
+    return ret;
+}
+
+void QGenericUnixThemeDBusListener::onSettingChanged(const QString &location, const QString &key, const QDBusVariant &value)
+{
+    auto sig = findSignal(location, key);
+    if (!sig.has_value())
+        return;
+
+    emit settingChanged(sig.value().provider, sig.value().setting, value.variant().toString());
+}
+
+#endif //QT_NO_DBUS
 
 class QGenericUnixThemePrivate : public QPlatformThemePrivate
 {
@@ -198,6 +502,10 @@ QVariant QGenericUnixTheme::themeHint(ThemeHint hint) const
         return QVariant(int(X11KeyboardScheme));
     case QPlatformTheme::UiEffects:
         return QVariant(int(HoverEffect));
+    case QPlatformTheme::MouseCursorTheme:
+        return QVariant(mouseCursorTheme());
+    case QPlatformTheme::MouseCursorSize:
+        return QVariant(mouseCursorSize());
     default:
         break;
     }
@@ -231,11 +539,9 @@ static QIcon xdgFileIcon(const QFileInfo &fileInfo)
 #if QT_CONFIG(settings)
 class QKdeThemePrivate : public QPlatformThemePrivate
 {
+
 public:
-    QKdeThemePrivate(const QStringList &kdeDirs, int kdeVersion)
-        : kdeDirs(kdeDirs)
-        , kdeVersion(kdeVersion)
-    { }
+    QKdeThemePrivate(const QStringList &kdeDirs, int kdeVersion);
 
     static QString kdeGlobals(const QString &kdeDir, int kdeVersion)
     {
@@ -266,8 +572,66 @@ public:
     int startDragDist = 10;
     int startDragTime = 500;
     int cursorBlinkRate = 1000;
+    Qt::ColorScheme m_colorScheme = Qt::ColorScheme::Unknown;
+    void updateColorScheme(const QString &themeName);
+
+#ifndef QT_NO_DBUS
+private:
+    std::unique_ptr<QGenericUnixThemeDBusListener> dbus;
+    bool initDbus();
+    void settingChangedHandler(QGenericUnixThemeDBusListener::Provider provider,
+                               QGenericUnixThemeDBusListener::Setting setting,
+                               const QString &value);
+#endif // QT_NO_DBUS
 };
 
+#ifndef QT_NO_DBUS
+void QKdeThemePrivate::settingChangedHandler(QGenericUnixThemeDBusListener::Provider provider,
+                                             QGenericUnixThemeDBusListener::Setting setting,
+                                             const QString &value)
+{
+    if (provider != QGenericUnixThemeDBusListener::Provider::Kde)
+        return;
+
+    switch (setting) {
+    case QGenericUnixThemeDBusListener::Setting::ColorScheme:
+        qCDebug(lcQpaThemeDBus) << "KDE color theme changed to:" << value;
+        break;
+    case QGenericUnixThemeDBusListener::Setting::Theme:
+        qCDebug(lcQpaThemeDBus) << "KDE global theme changed to:" << value;
+        break;
+    case QGenericUnixThemeDBusListener::Setting::ApplicationStyle:
+        qCDebug(lcQpaThemeDBus) << "KDE application style changed to:" << value;
+        break;
+    }
+
+    refresh();
+}
+
+bool QKdeThemePrivate::initDbus()
+{
+    dbus.reset(new QGenericUnixThemeDBusListener());
+    Q_ASSERT(dbus);
+
+    // Wrap slot in a lambda to avoid inheriting QKdeThemePrivate from QObject
+    auto wrapper = [this](QGenericUnixThemeDBusListener::Provider provider,
+                          QGenericUnixThemeDBusListener::Setting setting,
+                          const QString &value) {
+        settingChangedHandler(provider, setting, value);
+    };
+
+    return QObject::connect(dbus.get(), &QGenericUnixThemeDBusListener::settingChanged, dbus.get(), wrapper);
+}
+#endif // QT_NO_DBUS
+
+QKdeThemePrivate::QKdeThemePrivate(const QStringList &kdeDirs, int kdeVersion)
+    : kdeDirs(kdeDirs), kdeVersion(kdeVersion)
+{
+#ifndef QT_NO_DBUS
+    initDbus();
+#endif // QT_NO_DBUS
+}
+
 void QKdeThemePrivate::refresh()
 {
     resources.clear();
@@ -297,6 +661,14 @@ void QKdeThemePrivate::refresh()
             styleNames.push_front(style);
     }
 
+    const QVariant colorScheme = readKdeSetting(QStringLiteral("ColorScheme"), kdeDirs,
+                                                   kdeVersion, kdeSettings);
+
+    if (colorScheme.isValid())
+        updateColorScheme(colorScheme.toString());
+    else
+        m_colorScheme = Qt::ColorScheme::Unknown;
+
     const QVariant singleClickValue = readKdeSetting(QStringLiteral("KDE/SingleClick"), kdeDirs, kdeVersion, kdeSettings);
     if (singleClickValue.isValid())
         singleClick = singleClickValue.toBool();
@@ -368,6 +740,8 @@ void QKdeThemePrivate::refresh()
     if (QFont *toolBarFont = kdeFont(readKdeSetting(QStringLiteral("toolBarFont"), kdeDirs, kdeVersion, kdeSettings)))
         resources.fonts[QPlatformTheme::ToolButtonFont] = toolBarFont;
 
+    QWindowSystemInterface::handleThemeChange();
+
     qCDebug(lcQpaFonts) << "default fonts: system" << resources.fonts[QPlatformTheme::SystemFont]
                         << "fixed" << resources.fonts[QPlatformTheme::FixedFont];
     qDeleteAll(kdeSettings);
@@ -556,6 +930,10 @@ QVariant QKdeTheme::themeHint(QPlatformTheme::ThemeHint hint) const
         return QVariant(d->cursorBlinkRate);
     case QPlatformTheme::UiEffects:
         return QVariant(int(HoverEffect));
+    case QPlatformTheme::MouseCursorTheme:
+        return QVariant(mouseCursorTheme());
+    case QPlatformTheme::MouseCursorSize:
+        return QVariant(mouseCursorSize());
     default:
         break;
     }
@@ -572,6 +950,48 @@ QIcon QKdeTheme::fileIcon(const QFileInfo &fileInfo, QPlatformTheme::IconOptions
 #endif
 }
 
+Qt::ColorScheme QKdeTheme::colorScheme() const
+{
+    return d_func()->m_colorScheme;
+}
+
+/*!
+   \internal
+   \brief QKdeTheme::setColorScheme - guess and set appearance for unix themes.
+   KDE themes do not have an appearance property.
+   The key words "dark" or "light" should be part of the theme name.
+   This is, however, not a mandatory convention.
+
+   If \param themeName contains a key word, the respective appearance is set.
+   If it doesn't, the appearance is heuristically determined by comparing text and base color
+   of the system palette.
+ */
+void QKdeThemePrivate::updateColorScheme(const QString &themeName)
+{
+    if (themeName.contains(QLatin1StringView("light"), Qt::CaseInsensitive)) {
+        m_colorScheme = Qt::ColorScheme::Light;
+        return;
+    }
+    if (themeName.contains(QLatin1StringView("dark"), Qt::CaseInsensitive)) {
+        m_colorScheme = Qt::ColorScheme::Dark;
+        return;
+    }
+
+    if (systemPalette) {
+        if (systemPalette->text().color().lightness() < systemPalette->base().color().lightness()) {
+            m_colorScheme = Qt::ColorScheme::Light;
+            return;
+        }
+        if (systemPalette->text().color().lightness() > systemPalette->base().color().lightness()) {
+            m_colorScheme = Qt::ColorScheme::Dark;
+            return;
+        }
+    }
+
+    m_colorScheme = Qt::ColorScheme::Unknown;
+}
+
+
 const QPalette *QKdeTheme::palette(Palette type) const
 {
     Q_D(const QKdeTheme);
@@ -672,8 +1092,8 @@ const char *QGnomeTheme::name = "gnome";
 class QGnomeThemePrivate : public QPlatformThemePrivate
 {
 public:
-    QGnomeThemePrivate() : systemFont(nullptr), fixedFont(nullptr) {}
-    ~QGnomeThemePrivate() { delete systemFont; delete fixedFont; }
+    QGnomeThemePrivate();
+    ~QGnomeThemePrivate();
 
     void configureFonts(const QString &gtkFontName) const
     {
@@ -688,10 +1108,70 @@ public:
         qCDebug(lcQpaFonts) << "default fonts: system" << systemFont << "fixed" << fixedFont;
     }
 
-    mutable QFont *systemFont;
-    mutable QFont *fixedFont;
+    mutable QFont *systemFont = nullptr;
+    mutable QFont *fixedFont = nullptr;
+
+#ifndef QT_NO_DBUS
+    Qt::ColorScheme m_colorScheme = Qt::ColorScheme::Unknown;
+private:
+    std::unique_ptr<QGenericUnixThemeDBusListener> dbus;
+    bool initDbus();
+    void updateColorScheme(const QString &themeName);
+#endif // QT_NO_DBUS
 };
 
+QGnomeThemePrivate::QGnomeThemePrivate()
+{
+#ifndef QT_NO_DBUS
+    initDbus();
+#endif // QT_NO_DBUS
+}
+QGnomeThemePrivate::~QGnomeThemePrivate()
+{
+    if (systemFont)
+        delete systemFont;
+    if (fixedFont)
+        delete fixedFont;
+}
+
+#ifndef QT_NO_DBUS
+bool QGnomeThemePrivate::initDbus()
+{
+    dbus.reset(new QGenericUnixThemeDBusListener());
+    Q_ASSERT(dbus);
+
+    // Wrap slot in a lambda to avoid inheriting QGnomeThemePrivate from QObject
+    auto wrapper = [this](QGenericUnixThemeDBusListener::Provider provider,
+                          QGenericUnixThemeDBusListener::Setting setting,
+                          const QString &value) {
+        if (provider != QGenericUnixThemeDBusListener::Provider::Gnome
+            && provider != QGenericUnixThemeDBusListener::Provider::Gtk) {
+            return;
+        }
+
+        if (setting == QGenericUnixThemeDBusListener::Setting::Theme)
+            updateColorScheme(value);
+    };
+
+    return QObject::connect(dbus.get(), &QGenericUnixThemeDBusListener::settingChanged, dbus.get(), wrapper);
+}
+
+void QGnomeThemePrivate::updateColorScheme(const QString &themeName)
+{
+    const auto oldColorScheme = m_colorScheme;
+    if (themeName.contains(QLatin1StringView("light"), Qt::CaseInsensitive)) {
+        m_colorScheme = Qt::ColorScheme::Light;
+    } else if (themeName.contains(QLatin1StringView("dark"), Qt::CaseInsensitive)) {
+        m_colorScheme = Qt::ColorScheme::Dark;
+    } else {
+        m_colorScheme = Qt::ColorScheme::Unknown;
+    }
+
+    if (oldColorScheme != m_colorScheme)
+        QWindowSystemInterface::handleThemeChange();
+}
+#endif // QT_NO_DBUS
+
 QGnomeTheme::QGnomeTheme()
     : QPlatformTheme(new QGnomeThemePrivate())
 {
@@ -726,6 +1206,12 @@ QVariant QGnomeTheme::themeHint(QPlatformTheme::ThemeHint hint) const
     case QPlatformTheme::ButtonPressKeys:
         return QVariant::fromValue(
                 QList<Qt::Key>({ Qt::Key_Space, Qt::Key_Return, Qt::Key_Enter, Qt::Key_Select }));
+    case QPlatformTheme::PreselectFirstFileInDirectory:
+        return true;
+    case QPlatformTheme::MouseCursorTheme:
+        return QVariant(mouseCursorTheme());
+    case QPlatformTheme::MouseCursorSize:
+        return QVariant(mouseCursorSize());
     default:
         break;
     }
@@ -769,6 +1255,12 @@ QPlatformMenuBar *QGnomeTheme::createPlatformMenuBar() const
         return new QDBusMenuBar();
     return nullptr;
 }
+
+Qt::ColorScheme QGnomeTheme::colorScheme() const
+{
+    return d_func()->m_colorScheme;
+}
+
 #endif
 
 #if !defined(QT_NO_DBUS) && !defined(QT_NO_SYSTEMTRAYICON)
@@ -853,3 +1345,7 @@ QStringList QGenericUnixTheme::themeNames()
 }
 
 QT_END_NAMESPACE
+
+#ifndef QT_NO_DBUS
+#include "qgenericunixthemes.moc"
+#endif // QT_NO_DBUS