Add KDE5 desktop backend

This is mostly a copy of the KDE4 backend ported to Qt5/KF5.

One difference is that this code will initialize the QApplication
on-demand, when it's not yet available. This will allow us to use
this desktop backend also within a vclplug that does not use Qt
itself, such as the upcoming Gtk3/KDE5 hybrid.

Change-Id: I5cf96ac5729608c82a58eead6723a38f014ba875
Reviewed-on: https://gerrit.libreoffice.org/47716
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

7 files changed, 683 insertions, 0 deletions

diff --git a/shell/Library_kde5be.mk b/shell/Library_kde5be.mk
new file mode 100644
index 000000000000..b9c7c903a745
--- /dev/null
+++ b/shell/Library_kde5be.mk
@@ -0,0 +1,32 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_Library_Library,kde5be1))
+
+$(eval $(call gb_Library_use_sdk_api,kde5be1))
+
+$(eval $(call gb_Library_use_externals,kde5be1,\
+	boost_headers \
+	kde5 \
+))
+
+$(eval $(call gb_Library_use_libraries,kde5be1,\
+	cppu \
+	cppuhelper \
+	sal \
+))
+
+$(eval $(call gb_Library_set_componentfile,kde5be1,shell/source/backends/kde5be/kde5be1))
+
+$(eval $(call gb_Library_add_exception_objects,kde5be1,\
+    shell/source/backends/kde5be/kde5access \
+    shell/source/backends/kde5be/kde5backend \
+))
+
+# vim: set shiftwidth=4 tabstop=4 noexpandtab:
diff --git a/shell/Module_shell.mk b/shell/Module_shell.mk
index d1a54b9cf9ea..5da2416b6662 100644
--- a/shell/Module_shell.mk
+++ b/shell/Module_shell.mk
@@ -36,6 +36,12 @@ $(eval $(call gb_Module_add_targets,shell,\
 ))
 endif
 
+ifeq ($(ENABLE_KDE5),TRUE)
+$(eval $(call gb_Module_add_targets,shell,\
+	Library_kde5be \
+))
+endif
+
 ifeq ($(OS),WNT)
 
 $(eval $(call gb_Module_add_targets,shell,\
diff --git a/shell/source/backends/desktopbe/desktopbackend.cxx b/shell/source/backends/desktopbe/desktopbackend.cxx
index b641d00456e8..275c9e459c90 100644
--- a/shell/source/backends/desktopbe/desktopbackend.cxx
+++ b/shell/source/backends/desktopbe/desktopbackend.cxx
@@ -307,6 +307,10 @@ css::uno::Reference< css::uno::XInterface > createInstance(
         backend = createBackend(
             context,
             "com.sun.star.configuration.backend.KDE4Backend");
+    } else if ( desktop == "KDE5" ) {
+        backend = createBackend(
+            context,
+            "com.sun.star.configuration.backend.KDE5Backend");
     }
     return backend.is()
         ? backend : static_cast< cppu::OWeakObject * >(new Default);
diff --git a/shell/source/backends/kde5be/kde5access.cxx b/shell/source/backends/kde5be/kde5access.cxx
new file mode 100644
index 000000000000..5c4c0a0173f1
--- /dev/null
+++ b/shell/source/backends/kde5be/kde5access.cxx
@@ -0,0 +1,316 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "sal/config.h"
+
+#include "kde5access.hxx"
+
+#include <QtGui/QFont>
+#include <QtCore/QString>
+#include <QtGui/QFontDatabase>
+#include <QtCore/QStandardPaths>
+#include <QtCore/QDir>
+#include <QtCore/QUrl>
+
+#include <kprotocolmanager.h>
+
+#include <kemailsettings.h>
+// #include <kglobalsettings.h>
+
+#include <com/sun/star/uno/Any.hxx>
+#include <cppu/unotype.hxx>
+#include <osl/diagnose.h>
+#include <osl/file.h>
+#include <rtl/string.h>
+#include <rtl/ustring.hxx>
+
+namespace kde5access
+{
+namespace
+{
+namespace uno = css::uno;
+}
+
+css::beans::Optional<css::uno::Any> getValue(OUString const& id)
+{
+    if (id == "ExternalMailer")
+    {
+        KEMailSettings aEmailSettings;
+        QString aClientProgram;
+        OUString sClientProgram;
+
+        aClientProgram = aEmailSettings.getSetting(KEMailSettings::ClientProgram);
+        if (aClientProgram.isEmpty())
+            aClientProgram = QStringLiteral("kmail");
+        else
+            aClientProgram = aClientProgram.section(QLatin1Char(' '), 0, 0);
+        sClientProgram = reinterpret_cast<const sal_Unicode*>(aClientProgram.utf16());
+        return css::beans::Optional<css::uno::Any>(true, uno::makeAny(sClientProgram));
+    }
+    else if (id == "SourceViewFontHeight")
+    {
+        const QFont aFixedFont = QFontDatabase::systemFont(QFontDatabase::FixedFont);
+        const short nFontHeight = aFixedFont.pointSize();
+        return css::beans::Optional<css::uno::Any>(true, uno::makeAny(nFontHeight));
+    }
+    else if (id == "SourceViewFontName")
+    {
+        const QFont aFixedFont = QFontDatabase::systemFont(QFontDatabase::FixedFont);
+        const QString aFontName = aFixedFont.family();
+        const OUString sFontName = reinterpret_cast<const sal_Unicode*>(aFontName.utf16());
+        return css::beans::Optional<css::uno::Any>(true, uno::makeAny(sFontName));
+    }
+    else if (id == "EnableATToolSupport")
+    {
+        /* does not make much sense without an accessibility bridge */
+        bool ATToolSupport = false;
+        return css::beans::Optional<css::uno::Any>(true,
+                                                   uno::makeAny(OUString::boolean(ATToolSupport)));
+    }
+    else if (id == "WorkPathVariable")
+    {
+        QString aDocumentsDir(QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation));
+        if (aDocumentsDir.isEmpty())
+            aDocumentsDir = QDir::homePath();
+        OUString sDocumentsDir;
+        OUString sDocumentsURL;
+        if (aDocumentsDir.endsWith(QLatin1Char('/')))
+            aDocumentsDir.truncate(aDocumentsDir.length() - 1);
+        sDocumentsDir = reinterpret_cast<const sal_Unicode*>(aDocumentsDir.utf16());
+        osl_getFileURLFromSystemPath(sDocumentsDir.pData, &sDocumentsURL.pData);
+        return css::beans::Optional<css::uno::Any>(true, uno::makeAny(sDocumentsURL));
+    }
+    else if (id == "ooInetFTPProxyName")
+    {
+        QString aFTPProxy;
+        switch (KProtocolManager::proxyType())
+        {
+            case KProtocolManager::ManualProxy: // Proxies are manually configured
+                aFTPProxy = KProtocolManager::proxyFor(QStringLiteral("FTP"));
+                break;
+            case KProtocolManager::PACProxy: // A proxy configuration URL has been given
+            case KProtocolManager::WPADProxy: // A proxy should be automatically discovered
+            case KProtocolManager::
+                EnvVarProxy: // Use the proxy values set through environment variables
+                // In such cases, the proxy address is not stored in KDE, but determined dynamically.
+                // The proxy address may depend on the requested address, on the time of the day, on the speed of the wind...
+                // The best we can do here is to ask the current value for a given address.
+                aFTPProxy = KProtocolManager::proxyForUrl(
+                    QUrl(QStringLiteral("ftp://ftp.libreoffice.org")));
+                break;
+            default: // No proxy is used
+                break;
+        }
+        if (!aFTPProxy.isEmpty())
+        {
+            QUrl aProxy(aFTPProxy);
+            OUString sProxy = reinterpret_cast<const sal_Unicode*>(aProxy.host().utf16());
+            return css::beans::Optional<css::uno::Any>(true, uno::makeAny(sProxy));
+        }
+    }
+    else if (id == "ooInetFTPProxyPort")
+    {
+        QString aFTPProxy;
+        switch (KProtocolManager::proxyType())
+        {
+            case KProtocolManager::ManualProxy: // Proxies are manually configured
+                aFTPProxy = KProtocolManager::proxyFor(QStringLiteral("FTP"));
+                break;
+            case KProtocolManager::PACProxy: // A proxy configuration URL has been given
+            case KProtocolManager::WPADProxy: // A proxy should be automatically discovered
+            case KProtocolManager::
+                EnvVarProxy: // Use the proxy values set through environment variables
+                // In such cases, the proxy address is not stored in KDE, but determined dynamically.
+                // The proxy address may depend on the requested address, on the time of the day, on the speed of the wind...
+                // The best we can do here is to ask the current value for a given address.
+                aFTPProxy = KProtocolManager::proxyForUrl(
+                    QUrl(QStringLiteral("ftp://ftp.libreoffice.org")));
+                break;
+            default: // No proxy is used
+                break;
+        }
+        if (!aFTPProxy.isEmpty())
+        {
+            QUrl aProxy(aFTPProxy);
+            sal_Int32 nPort = aProxy.port();
+            return css::beans::Optional<css::uno::Any>(true, uno::makeAny(nPort));
+        }
+    }
+    else if (id == "ooInetHTTPProxyName")
+    {
+        QString aHTTPProxy;
+        switch (KProtocolManager::proxyType())
+        {
+            case KProtocolManager::ManualProxy: // Proxies are manually configured
+                aHTTPProxy = KProtocolManager::proxyFor(QStringLiteral("HTTP"));
+                break;
+            case KProtocolManager::PACProxy: // A proxy configuration URL has been given
+            case KProtocolManager::WPADProxy: // A proxy should be automatically discovered
+            case KProtocolManager::
+                EnvVarProxy: // Use the proxy values set through environment variables
+                // In such cases, the proxy address is not stored in KDE, but determined dynamically.
+                // The proxy address may depend on the requested address, on the time of the day, on the speed of the wind...
+                // The best we can do here is to ask the current value for a given address.
+                aHTTPProxy = KProtocolManager::proxyForUrl(
+                    QUrl(QStringLiteral("ftp://ftp.libreoffice.org")));
+                break;
+            default: // No proxy is used
+                break;
+        }
+        if (!aHTTPProxy.isEmpty())
+        {
+            QUrl aProxy(aHTTPProxy);
+            OUString sProxy = reinterpret_cast<const sal_Unicode*>(aProxy.host().utf16());
+            return css::beans::Optional<css::uno::Any>(true, uno::makeAny(sProxy));
+        }
+    }
+    else if (id == "ooInetHTTPProxyPort")
+    {
+        QString aHTTPProxy;
+        switch (KProtocolManager::proxyType())
+        {
+            case KProtocolManager::ManualProxy: // Proxies are manually configured
+                aHTTPProxy = KProtocolManager::proxyFor(QStringLiteral("HTTP"));
+                break;
+            case KProtocolManager::PACProxy: // A proxy configuration URL has been given
+            case KProtocolManager::WPADProxy: // A proxy should be automatically discovered
+            case KProtocolManager::
+                EnvVarProxy: // Use the proxy values set through environment variables
+                // In such cases, the proxy address is not stored in KDE, but determined dynamically.
+                // The proxy address may depend on the requested address, on the time of the day, on the speed of the wind...
+                // The best we can do here is to ask the current value for a given address.
+                aHTTPProxy = KProtocolManager::proxyForUrl(
+                    QUrl(QStringLiteral("ftp://ftp.libreoffice.org")));
+                break;
+            default: // No proxy is used
+                break;
+        }
+        if (!aHTTPProxy.isEmpty())
+        {
+            QUrl aProxy(aHTTPProxy);
+            sal_Int32 nPort = aProxy.port();
+            return css::beans::Optional<css::uno::Any>(true, uno::makeAny(nPort));
+        }
+    }
+    else if (id == "ooInetHTTPSProxyName")
+    {
+        QString aHTTPSProxy;
+        switch (KProtocolManager::proxyType())
+        {
+            case KProtocolManager::ManualProxy: // Proxies are manually configured
+                aHTTPSProxy = KProtocolManager::proxyFor(QStringLiteral("HTTPS"));
+                break;
+            case KProtocolManager::PACProxy: // A proxy configuration URL has been given
+            case KProtocolManager::WPADProxy: // A proxy should be automatically discovered
+            case KProtocolManager::
+                EnvVarProxy: // Use the proxy values set through environment variables
+                // In such cases, the proxy address is not stored in KDE, but determined dynamically.
+                // The proxy address may depend on the requested address, on the time of the day, on the speed of the wind...
+                // The best we can do here is to ask the current value for a given address.
+                aHTTPSProxy = KProtocolManager::proxyForUrl(
+                    QUrl(QStringLiteral("ftp://ftp.libreoffice.org")));
+                break;
+            default: // No proxy is used
+                break;
+        }
+        if (!aHTTPSProxy.isEmpty())
+        {
+            QUrl aProxy(aHTTPSProxy);
+            OUString sProxy = reinterpret_cast<const sal_Unicode*>(aProxy.host().utf16());
+            return css::beans::Optional<css::uno::Any>(true, uno::makeAny(sProxy));
+        }
+    }
+    else if (id == "ooInetHTTPSProxyPort")
+    {
+        QString aHTTPSProxy;
+        switch (KProtocolManager::proxyType())
+        {
+            case KProtocolManager::ManualProxy: // Proxies are manually configured
+                aHTTPSProxy = KProtocolManager::proxyFor(QStringLiteral("HTTPS"));
+                break;
+            case KProtocolManager::PACProxy: // A proxy configuration URL has been given
+            case KProtocolManager::WPADProxy: // A proxy should be automatically discovered
+            case KProtocolManager::
+                EnvVarProxy: // Use the proxy values set through environment variables
+                // In such cases, the proxy address is not stored in KDE, but determined dynamically.
+                // The proxy address may depend on the requested address, on the time of the day, on the speed of the wind...
+                // The best we can do here is to ask the current value for a given address.
+                aHTTPSProxy = KProtocolManager::proxyForUrl(
+                    QUrl(QStringLiteral("ftp://ftp.libreoffice.org")));
+                break;
+            default: // No proxy is used
+                break;
+        }
+        if (!aHTTPSProxy.isEmpty())
+        {
+            QUrl aProxy(aHTTPSProxy);
+            sal_Int32 nPort = aProxy.port();
+            return css::beans::Optional<css::uno::Any>(true, uno::makeAny(nPort));
+        }
+    }
+    else if (id == "ooInetNoProxy")
+    {
+        QString aNoProxyFor;
+        switch (KProtocolManager::proxyType())
+        {
+            case KProtocolManager::ManualProxy: // Proxies are manually configured
+            case KProtocolManager::PACProxy: // A proxy configuration URL has been given
+            case KProtocolManager::WPADProxy: // A proxy should be automatically discovered
+            case KProtocolManager::
+                EnvVarProxy: // Use the proxy values set through environment variables
+                aNoProxyFor = KProtocolManager::noProxyFor();
+                break;
+            default: // No proxy is used
+                break;
+        }
+        if (!aNoProxyFor.isEmpty())
+        {
+            OUString sNoProxyFor;
+
+            aNoProxyFor = aNoProxyFor.replace(QLatin1Char(','), QLatin1Char(';'));
+            sNoProxyFor = reinterpret_cast<const sal_Unicode*>(aNoProxyFor.utf16());
+            return css::beans::Optional<css::uno::Any>(true, uno::makeAny(sNoProxyFor));
+        }
+    }
+    else if (id == "ooInetProxyType")
+    {
+        int nProxyType;
+        switch (KProtocolManager::proxyType())
+        {
+            case KProtocolManager::ManualProxy: // Proxies are manually configured
+            case KProtocolManager::PACProxy: // A proxy configuration URL has been given
+            case KProtocolManager::WPADProxy: // A proxy should be automatically discovered
+            case KProtocolManager::
+                EnvVarProxy: // Use the proxy values set through environment variables
+                nProxyType = 1;
+                break;
+            default: // No proxy is used
+                nProxyType = 0;
+        }
+        return css::beans::Optional<css::uno::Any>(true, uno::makeAny((sal_Int32)nProxyType));
+    }
+    else
+    {
+        OSL_ASSERT(false); // this cannot happen
+    }
+    return css::beans::Optional<css::uno::Any>();
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/shell/source/backends/kde5be/kde5access.hxx b/shell/source/backends/kde5be/kde5access.hxx
new file mode 100644
index 000000000000..e1e8a11c8a94
--- /dev/null
+++ b/shell/source/backends/kde5be/kde5access.hxx
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SHELL_SOURCE_BACKENDS_KDE5BE_KDE5ACCESS_HXX
+#define INCLUDED_SHELL_SOURCE_BACKENDS_KDE5BE_KDE5ACCESS_HXX
+
+#include <sal/config.h>
+
+#include <com/sun/star/beans/Optional.hpp>
+
+namespace com
+{
+namespace sun
+{
+namespace star
+{
+namespace uno
+{
+class Any;
+}
+}
+}
+}
+
+namespace kde5access
+{
+css::beans::Optional<css::uno::Any> getValue(OUString const& id);
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/shell/source/backends/kde5be/kde5backend.cxx b/shell/source/backends/kde5be/kde5backend.cxx
new file mode 100644
index 000000000000..c89869579159
--- /dev/null
+++ b/shell/source/backends/kde5be/kde5backend.cxx
@@ -0,0 +1,252 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <QtWidgets/QApplication>
+
+#include <boost/noncopyable.hpp>
+#include <com/sun/star/beans/Optional.hpp>
+#include <com/sun/star/beans/PropertyVetoException.hpp>
+#include <com/sun/star/beans/UnknownPropertyException.hpp>
+#include <com/sun/star/beans/XPropertyChangeListener.hpp>
+#include <com/sun/star/beans/XPropertySet.hpp>
+#include <com/sun/star/beans/XPropertySetInfo.hpp>
+#include <com/sun/star/beans/XVetoableChangeListener.hpp>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/lang/WrappedTargetException.hpp>
+#include <com/sun/star/lang/XMultiComponentFactory.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/uno/Any.hxx>
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/uno/RuntimeException.hpp>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/uno/XCurrentContext.hpp>
+#include <cppuhelper/factory.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/implementationentry.hxx>
+#include <cppuhelper/weak.hxx>
+#include <rtl/string.h>
+#include <rtl/ustring.h>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+#include <uno/current_context.hxx>
+
+#include <osl/process.h>
+#include <osl/thread.h>
+
+#include "kde5access.hxx"
+
+namespace
+{
+OUString SAL_CALL getServiceImplementationName()
+{
+    return OUString("com.sun.star.comp.configuration.backend.KDE5Backend");
+}
+
+css::uno::Sequence<OUString> SAL_CALL getServiceSupportedServiceNames()
+{
+    OUString name("com.sun.star.configuration.backend.KDE5Backend");
+    return css::uno::Sequence<OUString>(&name, 1);
+}
+
+class Service : public cppu::WeakImplHelper<css::lang::XServiceInfo, css::beans::XPropertySet>,
+                private boost::noncopyable
+{
+public:
+    Service();
+
+private:
+    virtual ~Service() {}
+
+    virtual OUString SAL_CALL getImplementationName() override
+    {
+        return getServiceImplementationName();
+    }
+
+    virtual sal_Bool SAL_CALL supportsService(OUString const& ServiceName) override
+    {
+        return ServiceName == getSupportedServiceNames()[0];
+    }
+
+    virtual css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override
+    {
+        return getServiceSupportedServiceNames();
+    }
+
+    virtual css::uno::Reference<css::beans::XPropertySetInfo> SAL_CALL getPropertySetInfo() override
+    {
+        return css::uno::Reference<css::beans::XPropertySetInfo>();
+    }
+
+    virtual void SAL_CALL setPropertyValue(OUString const&, css::uno::Any const&) override;
+
+    virtual css::uno::Any SAL_CALL getPropertyValue(OUString const& PropertyName) override;
+
+    virtual void SAL_CALL addPropertyChangeListener(
+        OUString const&, css::uno::Reference<css::beans::XPropertyChangeListener> const&) override
+    {
+    }
+
+    virtual void SAL_CALL removePropertyChangeListener(
+        OUString const&, css::uno::Reference<css::beans::XPropertyChangeListener> const&) override
+    {
+    }
+
+    virtual void SAL_CALL addVetoableChangeListener(
+        OUString const&, css::uno::Reference<css::beans::XVetoableChangeListener> const&) override
+    {
+    }
+
+    virtual void SAL_CALL removeVetoableChangeListener(
+        OUString const&, css::uno::Reference<css::beans::XVetoableChangeListener> const&) override
+    {
+    }
+
+    bool enabled_;
+};
+
+OString getDisplayArg()
+{
+    OUString aParam;
+    const sal_uInt32 nParams = osl_getCommandArgCount();
+    for (sal_uInt32 nIdx = 0; nIdx < nParams; ++nIdx)
+    {
+        osl_getCommandArg(nIdx, &aParam.pData);
+        if (aParam != "-display")
+            continue;
+
+        ++nIdx;
+        osl_getCommandArg(nIdx, &aParam.pData);
+        return OUStringToOString(aParam, osl_getThreadTextEncoding());
+    }
+    return {};
+}
+
+OString getExecutable()
+{
+    OUString aParam, aBin;
+    osl_getExecutableFile(&aParam.pData);
+    osl_getSystemPathFromFileURL(aParam.pData, &aBin.pData);
+    return OUStringToOString(aBin, osl_getThreadTextEncoding());
+}
+
+// init the QApplication when we load the kde5backend into a non-Qt vclplug (e.g. Gtk3KDE5)
+// TODO: use a helper process to read these values without linking to Qt directly?
+// TODO: share this code somehow with Qt5Instance.cxx?
+void initQApp()
+{
+    const auto aDisplay = getDisplayArg();
+    int nFakeArgc = aDisplay.isEmpty() ? 2 : 3;
+    char** pFakeArgv = new char*[nFakeArgc];
+
+    pFakeArgv[0] = strdup(getExecutable().getStr());
+    pFakeArgv[1] = strdup("--nocrashhandler");
+    if (aDisplay.isEmpty())
+        pFakeArgv[2] = strdup(aDisplay.getStr());
+
+    char* session_manager = nullptr;
+    if (auto* session_manager_env = getenv("SESSION_MANAGER"))
+    {
+        session_manager = strdup(session_manager_env);
+        unsetenv("SESSION_MANAGER");
+    }
+
+    auto app = new QApplication(nFakeArgc, pFakeArgv);
+    QObject::connect(app, &QObject::destroyed, app, [nFakeArgc, pFakeArgv]() {
+        for (int i = 0; i < nFakeArgc; ++i)
+            delete pFakeArgv[i];
+        delete[] pFakeArgv;
+    });
+
+    if (session_manager != nullptr)
+    {
+        // coverity[tainted_string] - trusted source for setenv
+        setenv("SESSION_MANAGER", session_manager, 1);
+        free(session_manager);
+    }
+
+    QApplication::setQuitOnLastWindowClosed(false);
+}
+
+Service::Service()
+    : enabled_(false)
+{
+    css::uno::Reference<css::uno::XCurrentContext> context(css::uno::getCurrentContext());
+    if (context.is())
+    {
+        if (!qApp)
+        {
+            initQApp();
+        }
+        OUString desktop;
+        context->getValueByName("system.desktop-environment") >>= desktop;
+        enabled_ = desktop == "KDE5" && qApp != nullptr;
+    }
+}
+
+void Service::setPropertyValue(OUString const&, css::uno::Any const&)
+{
+    throw css::lang::IllegalArgumentException(OUString("setPropertyValue not supported"),
+                                              static_cast<cppu::OWeakObject*>(this), -1);
+}
+
+css::uno::Any Service::getPropertyValue(OUString const& PropertyName)
+{
+    if (PropertyName == "EnableATToolSupport" || PropertyName == "ExternalMailer"
+        || PropertyName == "SourceViewFontHeight" || PropertyName == "SourceViewFontName"
+        || PropertyName == "WorkPathVariable" || PropertyName == "ooInetFTPProxyName"
+        || PropertyName == "ooInetFTPProxyPort" || PropertyName == "ooInetHTTPProxyName"
+        || PropertyName == "ooInetHTTPProxyPort" || PropertyName == "ooInetHTTPSProxyName"
+        || PropertyName == "ooInetHTTPSProxyPort" || PropertyName == "ooInetNoProxy"
+        || PropertyName == "ooInetProxyType")
+    {
+        return css::uno::makeAny(enabled_ ? kde5access::getValue(PropertyName)
+                                          : css::beans::Optional<css::uno::Any>());
+    }
+    else if (PropertyName == "givenname" || PropertyName == "sn"
+             || PropertyName == "TemplatePathVariable")
+    {
+        return css::uno::makeAny(css::beans::Optional<css::uno::Any>());
+        //TODO: obtain values from KDE?
+    }
+    throw css::beans::UnknownPropertyException(PropertyName, static_cast<cppu::OWeakObject*>(this));
+}
+
+css::uno::Reference<css::uno::XInterface>
+    SAL_CALL createInstance(css::uno::Reference<css::uno::XComponentContext> const&)
+{
+    return static_cast<cppu::OWeakObject*>(new Service);
+}
+
+static cppu::ImplementationEntry const services[]
+    = { { &createInstance, &getServiceImplementationName, &getServiceSupportedServiceNames,
+          &cppu::createSingleComponentFactory, nullptr, 0 },
+        { nullptr, nullptr, nullptr, nullptr, nullptr, 0 } };
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT void* SAL_CALL kde5be1_component_getFactory(char const* pImplName,
+                                                                            void* pServiceManager,
+                                                                            void* pRegistryKey)
+{
+    return cppu::component_getFactoryHelper(pImplName, pServiceManager, pRegistryKey, services);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/shell/source/backends/kde5be/kde5be1.component b/shell/source/backends/kde5be/kde5be1.component
new file mode 100644
index 000000000000..74111874cb6b
--- /dev/null
+++ b/shell/source/backends/kde5be/kde5be1.component
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ -->
+
+<component loader="com.sun.star.loader.SharedLibrary" environment="@CPPU_ENV@"
+    prefix="kde5be1" xmlns="http://openoffice.org/2010/uno-components">
+  <implementation name="com.sun.star.comp.configuration.backend.KDE5Backend">
+    <service name="com.sun.star.configuration.backend.KDE5Backend"/>
+  </implementation>
+</component>