powerprofiles: Add support for power-profiles actions

The power profiles setting is made available by freedesktop's
power-profiles-daemon.
We just provide basic functionality in case DBus interface is available
in runtime.

Author: palinek

src/CMakeLists.txt

@@ -17,6 +17,8 @@ set(SOURCES
     iconproducer.cpp
     powerbutton.cpp
     ../config/powermanagementsettings.cpp
+    PowerProfiles.cpp
+    DBusPropAsyncGetter.cpp
 )
 
 set(UI_FILES

src/DBusPropAsyncGetter.cpp

@@ -0,0 +1,103 @@
+/* BEGIN_COMMON_COPYRIGHT_HEADER
+ * (c)LGPL2+
+ *
+ * LXQt - a lightweight, Qt based, desktop toolset
+ * https://lxqt.org
+ *
+ * Copyright: 2025~ LXQt team
+ * Authors:
+ *   Palo Kisa <[email protected]>
+ *
+ * This program or library is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ *
+ * END_COMMON_COPYRIGHT_HEADER */
+
+#include "DBusPropAsyncGetter.h"
+#include <QDBusMessage>
+#include <QDBusPendingCallWatcher>
+#include <QDBusPendingReply>
+#include <QDBusServiceWatcher>
+
+using namespace Qt::Literals::StringLiterals;
+
+namespace LXQt
+{
+    DBusPropAsyncGetter::DBusPropAsyncGetter(const QString & service, const QString & path, const QString & interface, const QDBusConnection & conn)
+        : mService{service}
+        , mPath{path}
+        , mInterface{interface}
+        , mConn{conn}
+    {
+        if (!mConn.connect(mService
+                    , mPath
+                    , "org.freedesktop.DBus.Properties"_L1
+                    , "PropertiesChanged"_L1
+                    , this
+                    , SLOT(onPropertiesChanged(QString, QVariantMap, QStringList))
+                    )
+           )
+            qDebug().noquote().nospace() << "Could not connect to org.freedesktop.DBus.Properties.PropertiesChanged()(" << mService << ',' << mPath << ')';
+
+        connect(new QDBusServiceWatcher{mService, mConn, QDBusServiceWatcher::WatchForUnregistration, this}
+                , &QDBusServiceWatcher::serviceUnregistered
+                , this
+                , [this] { Q_EMIT serviceDisappeared(); }
+               );
+    }
+
+    void DBusPropAsyncGetter::fetch(const QString name)
+    {
+        QDBusMessage msg = QDBusMessage::createMethodCall(mService, mPath, "org.freedesktop.DBus.Properties"_L1, "Get"_L1);
+        msg << mInterface << name;
+        connect(new QDBusPendingCallWatcher{mConn.asyncCall(msg), this}
+            , &QDBusPendingCallWatcher::finished
+            , this
+            , [this, name] (QDBusPendingCallWatcher * call) {
+                QDBusPendingReply<QVariant> reply = *call;
+                if (reply.isError())
+                    qDebug().noquote().nospace() << "Error on DBus request(" << mService << ',' << mPath << ',' << name << "): " << reply.error();
+                Q_EMIT fetched(name, reply.value());
+                call->deleteLater();
+            }
+        );
+    }
+
+    void DBusPropAsyncGetter::push(const QString name, const QVariant value)
+    {
+        QDBusMessage msg = QDBusMessage::createMethodCall(mService, mPath, "org.freedesktop.DBus.Properties"_L1, "Set"_L1);
+        msg << mInterface << name << value;
+        connect(new QDBusPendingCallWatcher{mConn.asyncCall(msg), this}
+            , &QDBusPendingCallWatcher::finished
+            , this
+            , [this, name] (QDBusPendingCallWatcher * call) {
+                QDBusPendingReply<> reply = *call;
+                if (reply.isError())
+                    qDebug().noquote().nospace() << "Error on DBus request(" << mService << ',' << mPath << ',' << mInterface << ',' << name << "): " << reply.error();
+                else
+                    Q_EMIT pushed(name);
+                call->deleteLater();
+            }
+        );
+    }
+
+    void DBusPropAsyncGetter::onPropertiesChanged(const QString & /*interfaceName*/, const QVariantMap & changedProperties, const QStringList & invalidatedProperties)
+    {
+        for (const auto & [key, value] : changedProperties.asKeyValueRange())
+            Q_EMIT fetched(key, value);
+        for (const auto & key : invalidatedProperties)
+            Q_EMIT fetched(key, {});
+    }
+}

src/DBusPropAsyncGetter.h

@@ -0,0 +1,61 @@
+/* BEGIN_COMMON_COPYRIGHT_HEADER
+ * (c)LGPL2+
+ *
+ * LXQt - a lightweight, Qt based, desktop toolset
+ * https://lxqt.org
+ *
+ * Copyright: 2025~ LXQt team
+ * Authors:
+ *   Palo Kisa <[email protected]>
+ *
+ * This program or library is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ *
+ * END_COMMON_COPYRIGHT_HEADER */
+
+#pragma once
+
+#include <QObject>
+#include <QDBusConnection>
+
+namespace LXQt
+{
+    class DBusPropAsyncGetter : public QObject
+    {
+        Q_OBJECT
+    public:
+        DBusPropAsyncGetter(const QString & service, const QString & path, const QString & interface, const QDBusConnection & conn);
+
+    public Q_SLOTS:
+        // Note: interthread signal/slot communication - parameters by values
+        void fetch(const QString name);
+        void push(const QString name, const QVariant value);
+
+    public Q_SLOTS:
+        void onPropertiesChanged(const QString & interfaceName, const QVariantMap & changedProperties, const QStringList & invalidatedProperties);
+
+    Q_SIGNALS:
+        // Note: interthread signal/slot communication - parameters by values
+        void fetched(const QString name, const QVariant value);
+        void pushed(const QString name);
+        void serviceDisappeared();
+
+    private:
+        const QString mService;
+        const QString mPath;
+        const QString mInterface;
+        QDBusConnection mConn;
+    };
+}

src/PowerProfiles.cpp

@@ -0,0 +1,152 @@
+/* BEGIN_COMMON_COPYRIGHT_HEADER
+ * (c)LGPL2+
+ *
+ * LXQt - a lightweight, Qt based, desktop toolset
+ * https://lxqt.org
+ *
+ * Copyright: 2025~ LXQt team
+ * Authors:
+ *   Palo Kisa <[email protected]>
+ *
+ * This program or library is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ *
+ * END_COMMON_COPYRIGHT_HEADER */
+
+#include <QMenu>
+#include <QActionGroup>
+#include <QAction>
+#include <QThread>
+#include <QDBusMetaType>
+#include "PowerProfiles.h"
+#include "DBusPropAsyncGetter.h"
+
+namespace LXQt
+{
+    Q_GLOBAL_STATIC(LXQt::PowerProfiles, g_power_profiles)
+
+    const QString PowerProfiles::msDBusPPService = QStringLiteral("org.freedesktop.UPower.PowerProfiles");
+    const QString PowerProfiles::msDBusPPPath = QStringLiteral("/org/freedesktop/UPower/PowerProfiles");
+    const QString PowerProfiles::msDBusPPInterface = msDBusPPService;
+    const QString PowerProfiles::msDBusPPProperties[] = { QStringLiteral("ActiveProfile"), QStringLiteral("Profiles") };
+
+    PowerProfiles & PowerProfiles::instance()
+    {
+        return *g_power_profiles;
+    }
+
+    PowerProfiles::PowerProfiles(QObject * parent/* = nullptr*/)
+        : QObject{parent}
+        , mThread{new QThread}
+        , mPropGetter{new DBusPropAsyncGetter{msDBusPPService, msDBusPPPath, msDBusPPInterface, QDBusConnection::systemBus()}}
+        , mMenu{new QMenu}
+
+    {
+        mMenu->menuAction()->setIcon(QIcon::fromTheme(QStringLiteral("preferences-system-performance")));
+        mMenu->setTitle(tr("Power profile"));
+
+        // register the DBus types
+        qRegisterMetaType<QListOfQVariantMap>("QListOfQVariantMap");
+        qDBusRegisterMetaType<QListOfQVariantMap>();
+
+        // we want to dispatch DBus calls on dedicated thread
+        mPropGetter->moveToThread(mThread.get());
+
+        // signals forwarding
+        connect(mPropGetter.get(), &DBusPropAsyncGetter::fetched, this, &PowerProfiles::propertyFetched);
+        connect(mPropGetter.get(), &DBusPropAsyncGetter::pushed, this, &PowerProfiles::propertyPushed);
+
+        // interested signals for our processing
+        connect(mPropGetter.get(), &DBusPropAsyncGetter::fetched, this, &PowerProfiles::onFetched);
+        connect(mPropGetter.get(), &DBusPropAsyncGetter::serviceDisappeared, this, [this] { reassembleMenu({}); });
+
+        // our generated signals for dispatching into dedicated thread
+        connect(this, &PowerProfiles::needPropertyFetch, mPropGetter.get(), &DBusPropAsyncGetter::fetch);
+        connect(this, &PowerProfiles::needPropertyPush, mPropGetter.get(), &DBusPropAsyncGetter::push);
+
+        mThread->start();
+
+        reassembleMenu({});
+
+        Q_EMIT needPropertyFetch(msDBusPPProperties[PPP_ActiveProfile]);
+        Q_EMIT needPropertyFetch(msDBusPPProperties[PPP_Profiles]);
+    }
+
+    PowerProfiles::~PowerProfiles()
+    {
+        mThread->quit();
+        mThread->wait();
+    }
+
+    QMenu * PowerProfiles::menu()
+    {
+        return mMenu.get();
+    }
+
+    void PowerProfiles::onFetched(const QString name, const QVariant value)
+    {
+        if (name == msDBusPPProperties[PPP_ActiveProfile]) {
+            const QString profile = qdbus_cast<QString>(value);
+            if (mActiveProfile == profile)
+                return;
+            mActiveProfile = profile;
+            if (mActions)
+                for (auto const & action : mActions->actions())
+                    action->setChecked(get<QString>(action->data()) == mActiveProfile);
+        } else if (name == msDBusPPProperties[PPP_Profiles]) {
+            reassembleMenu(qdbus_cast<QListOfQVariantMap>(value));
+        }
+    }
+
+    void PowerProfiles::reassembleMenu(const QListOfQVariantMap & profiles)
+    {
+        mMenu->clear();
+        if (profiles.empty())
+        {
+            mActions.reset(nullptr);
+            mMenu->addAction(tr("power-profiles-daemon not available"))->setDisabled(true);
+            return;
+        }
+
+        mActions.reset(new QActionGroup(nullptr));
+        mActions->setExclusionPolicy(QActionGroup::ExclusionPolicy::ExclusiveOptional);
+
+        connect(mActions.get(), &QActionGroup::triggered, this, [this] (const QAction * a) {
+            setActiveProfile(get<QString>(a->data()));
+        });
+
+        for (auto const & profile : profiles)
+        {
+            const QString p = qdbus_cast<QString>(profile[QStringLiteral("Profile")]);
+            auto a = new QAction(p, mActions.get());
+            a->setCheckable(true);
+            a->setData(p);
+            a->setChecked(mActiveProfile == p);
+        }
+        mMenu->addActions(mActions->actions());
+    }
+
+    const QString & PowerProfiles::activeProfile() const
+    {
+        return mActiveProfile;
+    }
+
+    void PowerProfiles::setActiveProfile(const QString &value)
+    {
+        // Note: Just emit the signal to make change. Don't modify any internal state.
+        //  We will be notified by the fetched() signal upon sucessfull PropertyChanged.
+        Q_EMIT needPropertyPush(msDBusPPProperties[PPP_ActiveProfile], QVariant::fromValue(QDBusVariant{value}));
+    }
+}