Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

42 files changed, 2737 insertions, 0 deletions

diff --git a/vcl/unx/gtk3_kde5/FPServiceInfo.hxx b/vcl/unx/gtk3_kde5/FPServiceInfo.hxx
new file mode 100644
index 000000000..1fbb8fd27
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/FPServiceInfo.hxx
@@ -0,0 +1,28 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+// the service names
+#define FILE_PICKER_SERVICE_NAME "com.sun.star.ui.dialogs.Gtk3KDE5FilePicker"
+
+// the implementation names
+#define FILE_PICKER_IMPL_NAME "com.sun.star.ui.dialogs.Gtk3KDE5FilePicker"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkaction.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkaction.cxx
new file mode 100644
index 000000000..6b9f5e3d8
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkaction.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkaction.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkbridge.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkbridge.cxx
new file mode 100644
index 000000000..e07fc6c29
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkbridge.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkbridge.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkcomponent.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkcomponent.cxx
new file mode 100644
index 000000000..5eac70ebd
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkcomponent.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkcomponent.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkeditabletext.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkeditabletext.cxx
new file mode 100644
index 000000000..792e432e1
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkeditabletext.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkeditabletext.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkfactory.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkfactory.cxx
new file mode 100644
index 000000000..2ddc5c55c
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkfactory.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkfactory.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkhypertext.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkhypertext.cxx
new file mode 100644
index 000000000..f3fa99006
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkhypertext.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkhypertext.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkimage.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkimage.cxx
new file mode 100644
index 000000000..eb3acc713
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkimage.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkimage.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atklistener.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atklistener.cxx
new file mode 100644
index 000000000..cf10d29df
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atklistener.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atklistener.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkregistry.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkregistry.cxx
new file mode 100644
index 000000000..cc10fbfdd
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkregistry.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkregistry.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkselection.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkselection.cxx
new file mode 100644
index 000000000..4c7fc5c15
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkselection.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkselection.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atktable.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atktable.cxx
new file mode 100644
index 000000000..672125d1a
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atktable.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atktable.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atktext.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atktext.cxx
new file mode 100644
index 000000000..de1d1f06c
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atktext.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atktext.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atktextattributes.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atktextattributes.cxx
new file mode 100644
index 000000000..aeac0e02d
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atktextattributes.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atktextattributes.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkutil.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkutil.cxx
new file mode 100644
index 000000000..193b08e9a
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkutil.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkutil.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkvalue.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkvalue.cxx
new file mode 100644
index 000000000..75825b4e1
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkvalue.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkvalue.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkwrapper.cxx b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkwrapper.cxx
new file mode 100644
index 000000000..a1bcc2e29
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/a11y/gtk3_kde5_atkwrapper.cxx
@@ -0,0 +1,12 @@
+/* -*- 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/.
+ */
+
+#include "../../gtk3/a11y/atkwrapper.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/filepicker_ipc_commands.hxx b/vcl/unx/gtk3_kde5/filepicker_ipc_commands.hxx
new file mode 100644
index 000000000..1d0925257
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/filepicker_ipc_commands.hxx
@@ -0,0 +1,173 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <cstdint>
+#include <iostream>
+#include <vector>
+
+#include <sal/types.h>
+#include <com/sun/star/uno/Sequence.hxx>
+
+// #define DEBUG_FILEPICKER_IPC
+
+namespace rtl
+{
+class OUString;
+}
+class QString;
+
+enum class Commands : uint16_t
+{
+    SetTitle,
+    SetWinId,
+    Execute,
+    SetMultiSelectionMode,
+    SetDefaultName,
+    SetDisplayDirectory,
+    GetDisplayDirectory,
+    GetSelectedFiles,
+    AppendFilter,
+    SetCurrentFilter,
+    GetCurrentFilter,
+    SetValue,
+    GetValue,
+    EnableControl,
+    SetLabel,
+    GetLabel,
+    AddCheckBox,
+    Initialize,
+    Quit,
+    EnablePickFolderMode,
+};
+
+inline std::vector<char> readIpcStringArg(std::istream& stream)
+{
+    uint32_t length = 0;
+    stream >> length;
+    stream.ignore(); // skip space separator
+    std::vector<char> buffer(length, '\0');
+    stream.read(buffer.data(), length);
+    return buffer;
+}
+
+void readIpcArg(std::istream& stream, OUString& string);
+void readIpcArg(std::istream& stream, QString& string);
+void readIpcArg(std::istream& stream, css::uno::Sequence<OUString>& seq);
+
+inline void readIpcArg(std::istream& stream, Commands& value)
+{
+    uint16_t v = 0;
+    stream >> v;
+    stream.ignore(); // skip space
+    value = static_cast<Commands>(v);
+}
+
+void readIpcArg(std::istream&, sal_Bool) = delete;
+
+inline void readIpcArg(std::istream& stream, bool& value)
+{
+    stream >> value;
+    stream.ignore(); // skip space
+}
+
+inline void readIpcArg(std::istream& stream, sal_Int16& value)
+{
+    stream >> value;
+    stream.ignore(); // skip space
+}
+
+inline void readIpcArg(std::istream& stream, sal_uIntPtr& value)
+{
+    stream >> value;
+    stream.ignore(); // skip space
+}
+
+#if SAL_TYPES_SIZEOFPOINTER == 4
+inline void readIpcArg(std::istream& stream, uint64_t& value)
+{
+    stream >> value;
+    stream.ignore(); // skip space
+}
+#endif
+
+inline void readIpcArgs(std::istream& /*stream*/)
+{
+    // end of arguments, nothing to do
+}
+
+template <typename T, typename... Args>
+inline void readIpcArgs(std::istream& stream, T& arg, Args&... args)
+{
+    readIpcArg(stream, arg);
+    readIpcArgs(stream, args...);
+}
+
+void sendIpcArg(std::ostream& stream, const OUString& string);
+void sendIpcArg(std::ostream& stream, const QString& string);
+
+inline void sendIpcStringArg(std::ostream& stream, uint32_t length, const char* string)
+{
+    stream << length << ' ';
+    stream.write(string, length);
+    stream << ' ';
+}
+
+inline void sendIpcArg(std::ostream& stream, Commands value)
+{
+    stream << static_cast<uint16_t>(value) << ' ';
+}
+
+void sendIpcArg(std::ostream&, sal_Bool) = delete;
+
+inline void sendIpcArg(std::ostream& stream, bool value) { stream << value << ' '; }
+
+inline void sendIpcArg(std::ostream& stream, sal_Int16 value) { stream << value << ' '; }
+
+inline void sendIpcArg(std::ostream& stream, sal_uIntPtr value) { stream << value << ' '; }
+
+#if SAL_TYPES_SIZEOFPOINTER == 4
+inline void sendIpcArg(std::ostream& stream, uint64_t value) { stream << value << ' '; }
+#endif
+
+inline void sendIpcArgsImpl(std::ostream& stream)
+{
+    // end of arguments, flush stream
+    stream << std::endl;
+}
+
+template <typename T, typename... Args>
+inline void sendIpcArgsImpl(std::ostream& stream, const T& arg, const Args&... args)
+{
+    sendIpcArg(stream, arg);
+    sendIpcArgsImpl(stream, args...);
+}
+
+template <typename T, typename... Args>
+inline void sendIpcArgs(std::ostream& stream, const T& arg, const Args&... args)
+{
+    sendIpcArgsImpl(stream, arg, args...);
+#ifdef DEBUG_FILEPICKER_IPC
+    std::cerr << "IPC MSG: ";
+    sendIpcArgsImpl(std::cerr, arg, args...);
+#endif
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_a11y.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_a11y.cxx
new file mode 100644
index 000000000..02fd47a60
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_a11y.cxx
@@ -0,0 +1,38 @@
+/* -*- 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 "../gtk3/a11y/gtk3atkaction.cxx"
+#include "../gtk3/a11y/gtk3atkbridge.cxx"
+#include "../gtk3/a11y/gtk3atkcomponent.cxx"
+#include "../gtk3/a11y/gtk3atkeditabletext.cxx"
+#include "../gtk3/a11y/gtk3atkfactory.cxx"
+#include "../gtk3/a11y/gtk3atkhypertext.cxx"
+#include "../gtk3/a11y/gtk3atkimage.cxx"
+#include "../gtk3/a11y/gtk3atklistener.cxx"
+#include "../gtk3/a11y/gtk3atkregistry.cxx"
+#include "../gtk3/a11y/gtk3atkselection.cxx"
+#include "../gtk3/a11y/gtk3atktable.cxx"
+#include "../gtk3/a11y/gtk3atktextattributes.cxx"
+#include "../gtk3/a11y/gtk3atktext.cxx"
+#include "../gtk3/a11y/gtk3atkutil.cxx"
+#include "../gtk3/a11y/gtk3atkvalue.cxx"
+#include "../gtk3/a11y/gtk3atkwindow.cxx"
+#include "../gtk3/a11y/gtk3atkwrapper.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_cairo.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_cairo.cxx
new file mode 100644
index 000000000..ed8780447
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_cairo.cxx
@@ -0,0 +1,22 @@
+/* -*- 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 "../gtk3/gtkcairo.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_customcellrenderer.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_customcellrenderer.cxx
new file mode 100644
index 000000000..aebe2c89e
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_customcellrenderer.cxx
@@ -0,0 +1,12 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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/.
+ */
+
+#include "../gtk3/customcellrenderer.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker.cxx
new file mode 100644
index 000000000..d3a053a08
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker.cxx
@@ -0,0 +1,455 @@
+/* -*- 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 <QUrl>
+#include <KFileWidget>
+
+#include "gtk3_kde5_filepicker.hxx"
+
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <com/sun/star/ui/dialogs/TemplateDescription.hpp>
+#include <com/sun/star/ui/dialogs/CommonFilePickerElementIds.hpp>
+#include <com/sun/star/ui/dialogs/ExtendedFilePickerElementIds.hpp>
+
+#include <sal/log.hxx>
+#include <vcl/svapp.hxx>
+#include "FPServiceInfo.hxx"
+
+#undef Region
+
+#include <fpicker/strings.hrc>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::ui::dialogs;
+using namespace ::com::sun::star::ui::dialogs::TemplateDescription;
+using namespace ::com::sun::star::ui::dialogs::ExtendedFilePickerElementIds;
+using namespace ::com::sun::star::ui::dialogs::CommonFilePickerElementIds;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::beans;
+using namespace ::com::sun::star::uno;
+
+// helper functions
+
+namespace
+{
+uno::Sequence<OUString> FilePicker_getSupportedServiceNames()
+{
+    return { "com.sun.star.ui.dialogs.FilePicker", "com.sun.star.ui.dialogs.SystemFilePicker",
+             "com.sun.star.ui.dialogs.Gtk3KDE5FilePicker" };
+}
+}
+
+// Gtk3KDE5FilePicker
+
+Gtk3KDE5FilePicker::Gtk3KDE5FilePicker(const uno::Reference<uno::XComponentContext>&)
+    : Gtk3KDE5FilePicker_Base(_helperMutex)
+{
+    setMultiSelectionMode(false);
+
+    // tdf#124598 dummy KWidget use to make gtk3_kde5 VCL plugin link against KIO libraries
+    QString sDummyStr;
+    QUrl aUrl = KFileWidget::getStartUrl(QUrl(), sDummyStr);
+    aUrl.setPath("/dev/null");
+}
+
+Gtk3KDE5FilePicker::~Gtk3KDE5FilePicker() = default;
+
+void SAL_CALL
+Gtk3KDE5FilePicker::addFilePickerListener(const uno::Reference<XFilePickerListener>& xListener)
+{
+    SolarMutexGuard aGuard;
+    m_xListener = xListener;
+}
+
+void SAL_CALL
+Gtk3KDE5FilePicker::removeFilePickerListener(const uno::Reference<XFilePickerListener>&)
+{
+    SolarMutexGuard aGuard;
+    m_xListener.clear();
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::setTitle(const OUString& title)
+{
+    m_ipc.sendCommand(Commands::SetTitle, title);
+}
+
+sal_Int16 SAL_CALL Gtk3KDE5FilePicker::execute()
+{
+    SolarMutexGuard g;
+    return m_ipc.execute();
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::setMultiSelectionMode(sal_Bool multiSelect)
+{
+    m_ipc.sendCommand(Commands::SetMultiSelectionMode, bool(multiSelect));
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::setDefaultName(const OUString& name)
+{
+    m_ipc.sendCommand(Commands::SetDefaultName, name);
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::setDisplayDirectory(const OUString& dir)
+{
+    m_ipc.sendCommand(Commands::SetDisplayDirectory, dir);
+}
+
+OUString SAL_CALL Gtk3KDE5FilePicker::getDisplayDirectory()
+{
+    auto id = m_ipc.sendCommand(Commands::GetDisplayDirectory);
+    OUString dir;
+    m_ipc.readResponse(id, dir);
+    return dir;
+}
+
+uno::Sequence<OUString> SAL_CALL Gtk3KDE5FilePicker::getFiles()
+{
+    uno::Sequence<OUString> seq = getSelectedFiles();
+    if (seq.getLength() > 1)
+        seq.realloc(1);
+    return seq;
+}
+
+uno::Sequence<OUString> SAL_CALL Gtk3KDE5FilePicker::getSelectedFiles()
+{
+    auto id = m_ipc.sendCommand(Commands::GetSelectedFiles);
+    uno::Sequence<OUString> seq;
+    m_ipc.readResponse(id, seq);
+    return seq;
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::appendFilter(const OUString& title, const OUString& filter)
+{
+    m_ipc.sendCommand(Commands::AppendFilter, title, filter);
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::setCurrentFilter(const OUString& title)
+{
+    m_ipc.sendCommand(Commands::SetCurrentFilter, title);
+}
+
+OUString SAL_CALL Gtk3KDE5FilePicker::getCurrentFilter()
+{
+    auto id = m_ipc.sendCommand(Commands::GetCurrentFilter);
+    OUString filter;
+    m_ipc.readResponse(id, filter);
+    return filter;
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::appendFilterGroup(const OUString& /*rGroupTitle*/,
+                                                    const uno::Sequence<beans::StringPair>& filters)
+{
+    const sal_uInt16 length = filters.getLength();
+    for (sal_uInt16 i = 0; i < length; ++i)
+    {
+        beans::StringPair aPair = filters[i];
+        appendFilter(aPair.First, aPair.Second);
+    }
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::setValue(sal_Int16 controlId, sal_Int16 nControlAction,
+                                           const uno::Any& value)
+{
+    if (value.has<bool>())
+    {
+        m_ipc.sendCommand(Commands::SetValue, controlId, nControlAction, value.get<bool>());
+    }
+    else
+    {
+        SAL_INFO("vcl.gtkkde5", "set value of unhandled type " << controlId);
+    }
+}
+
+uno::Any SAL_CALL Gtk3KDE5FilePicker::getValue(sal_Int16 controlId, sal_Int16 nControlAction)
+{
+    if (CHECKBOX_AUTOEXTENSION == controlId)
+        // We ignore this one and rely on QFileDialog to provide the function.
+        // Always return false, to pretend we do not support this, otherwise
+        // LO core would try to be smart and cut the extension in some places,
+        // interfering with QFileDialog's handling of it. QFileDialog also
+        // saves the value of the setting, so LO core is not needed for that either.
+        return uno::Any(false);
+
+    auto id = m_ipc.sendCommand(Commands::GetValue, controlId, nControlAction);
+
+    bool value = false;
+    m_ipc.readResponse(id, value);
+
+    return uno::Any(value);
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::enableControl(sal_Int16 controlId, sal_Bool enable)
+{
+    m_ipc.sendCommand(Commands::EnableControl, controlId, bool(enable));
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::setLabel(sal_Int16 controlId, const OUString& label)
+{
+    m_ipc.sendCommand(Commands::SetLabel, controlId, label);
+}
+
+OUString SAL_CALL Gtk3KDE5FilePicker::getLabel(sal_Int16 controlId)
+{
+    auto id = m_ipc.sendCommand(Commands::GetLabel, controlId);
+    OUString label;
+    m_ipc.readResponse(id, label);
+    return label;
+}
+
+void Gtk3KDE5FilePicker::addCustomControl(sal_Int16 controlId)
+{
+    TranslateId resId;
+
+    switch (controlId)
+    {
+        case CHECKBOX_AUTOEXTENSION:
+            resId = STR_SVT_FILEPICKER_AUTO_EXTENSION;
+            break;
+        case CHECKBOX_PASSWORD:
+            resId = STR_SVT_FILEPICKER_PASSWORD;
+            break;
+        case CHECKBOX_FILTEROPTIONS:
+            resId = STR_SVT_FILEPICKER_FILTER_OPTIONS;
+            break;
+        case CHECKBOX_READONLY:
+            resId = STR_SVT_FILEPICKER_READONLY;
+            break;
+        case CHECKBOX_LINK:
+            resId = STR_SVT_FILEPICKER_INSERT_AS_LINK;
+            break;
+        case CHECKBOX_PREVIEW:
+            resId = STR_SVT_FILEPICKER_SHOW_PREVIEW;
+            break;
+        case CHECKBOX_SELECTION:
+            resId = STR_SVT_FILEPICKER_SELECTION;
+            break;
+        case CHECKBOX_GPGENCRYPTION:
+            resId = STR_SVT_FILEPICKER_GPGENCRYPT;
+            break;
+        case PUSHBUTTON_PLAY:
+            resId = STR_SVT_FILEPICKER_PLAY;
+            break;
+        case LISTBOX_VERSION:
+            resId = STR_SVT_FILEPICKER_VERSION;
+            break;
+        case LISTBOX_TEMPLATE:
+            resId = STR_SVT_FILEPICKER_TEMPLATES;
+            break;
+        case LISTBOX_IMAGE_TEMPLATE:
+            resId = STR_SVT_FILEPICKER_IMAGE_TEMPLATE;
+            break;
+        case LISTBOX_IMAGE_ANCHOR:
+            resId = STR_SVT_FILEPICKER_IMAGE_ANCHOR;
+            break;
+        case LISTBOX_VERSION_LABEL:
+        case LISTBOX_TEMPLATE_LABEL:
+        case LISTBOX_IMAGE_TEMPLATE_LABEL:
+        case LISTBOX_IMAGE_ANCHOR_LABEL:
+        case LISTBOX_FILTER_SELECTOR:
+            break;
+    }
+
+    switch (controlId)
+    {
+        case CHECKBOX_AUTOEXTENSION:
+        case CHECKBOX_PASSWORD:
+        case CHECKBOX_FILTEROPTIONS:
+        case CHECKBOX_READONLY:
+        case CHECKBOX_LINK:
+        case CHECKBOX_PREVIEW:
+        case CHECKBOX_SELECTION:
+        case CHECKBOX_GPGENCRYPTION:
+        {
+            // the checkbox is created even for CHECKBOX_AUTOEXTENSION to simplify
+            // code, but the checkbox is hidden and ignored
+            bool hidden = controlId == CHECKBOX_AUTOEXTENSION;
+
+            m_ipc.sendCommand(Commands::AddCheckBox, controlId, hidden, getResString(resId));
+
+            break;
+        }
+        case PUSHBUTTON_PLAY:
+        case LISTBOX_VERSION:
+        case LISTBOX_TEMPLATE:
+        case LISTBOX_IMAGE_TEMPLATE:
+        case LISTBOX_IMAGE_ANCHOR:
+        case LISTBOX_VERSION_LABEL:
+        case LISTBOX_TEMPLATE_LABEL:
+        case LISTBOX_IMAGE_TEMPLATE_LABEL:
+        case LISTBOX_IMAGE_ANCHOR_LABEL:
+        case LISTBOX_FILTER_SELECTOR:
+            break;
+    }
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::initialize(const uno::Sequence<uno::Any>& args)
+{
+    // parameter checking
+    uno::Any arg;
+    if (args.getLength() == 0)
+    {
+        throw lang::IllegalArgumentException("no arguments", static_cast<XFilePicker2*>(this), 1);
+    }
+
+    arg = args[0];
+
+    if ((arg.getValueType() != cppu::UnoType<sal_Int16>::get())
+        && (arg.getValueType() != cppu::UnoType<sal_Int8>::get()))
+    {
+        throw lang::IllegalArgumentException("invalid argument type",
+                                             static_cast<XFilePicker2*>(this), 1);
+    }
+
+    sal_Int16 templateId = -1;
+    arg >>= templateId;
+
+    bool saveDialog = false;
+    switch (templateId)
+    {
+        case FILEOPEN_SIMPLE:
+            break;
+
+        case FILESAVE_SIMPLE:
+            saveDialog = true;
+            break;
+
+        case FILESAVE_AUTOEXTENSION:
+            saveDialog = true;
+            addCustomControl(CHECKBOX_AUTOEXTENSION);
+            break;
+
+        case FILESAVE_AUTOEXTENSION_PASSWORD:
+        {
+            saveDialog = true;
+            addCustomControl(CHECKBOX_PASSWORD);
+            addCustomControl(CHECKBOX_GPGENCRYPTION);
+            break;
+        }
+        case FILESAVE_AUTOEXTENSION_PASSWORD_FILTEROPTIONS:
+        {
+            saveDialog = true;
+            addCustomControl(CHECKBOX_AUTOEXTENSION);
+            addCustomControl(CHECKBOX_PASSWORD);
+            addCustomControl(CHECKBOX_GPGENCRYPTION);
+            addCustomControl(CHECKBOX_FILTEROPTIONS);
+            break;
+        }
+        case FILESAVE_AUTOEXTENSION_SELECTION:
+            saveDialog = true;
+            addCustomControl(CHECKBOX_AUTOEXTENSION);
+            addCustomControl(CHECKBOX_SELECTION);
+            break;
+
+        case FILESAVE_AUTOEXTENSION_TEMPLATE:
+            saveDialog = true;
+            addCustomControl(CHECKBOX_AUTOEXTENSION);
+            addCustomControl(LISTBOX_TEMPLATE);
+            break;
+
+        case FILEOPEN_LINK_PREVIEW_IMAGE_TEMPLATE:
+            addCustomControl(CHECKBOX_LINK);
+            addCustomControl(CHECKBOX_PREVIEW);
+            addCustomControl(LISTBOX_IMAGE_TEMPLATE);
+            break;
+
+        case FILEOPEN_LINK_PREVIEW_IMAGE_ANCHOR:
+            addCustomControl(CHECKBOX_LINK);
+            addCustomControl(CHECKBOX_PREVIEW);
+            addCustomControl(LISTBOX_IMAGE_ANCHOR);
+            break;
+
+        case FILEOPEN_PLAY:
+            addCustomControl(PUSHBUTTON_PLAY);
+            break;
+
+        case FILEOPEN_LINK_PLAY:
+            addCustomControl(CHECKBOX_LINK);
+            addCustomControl(PUSHBUTTON_PLAY);
+            break;
+
+        case FILEOPEN_READONLY_VERSION:
+            addCustomControl(CHECKBOX_READONLY);
+            addCustomControl(LISTBOX_VERSION);
+            break;
+
+        case FILEOPEN_LINK_PREVIEW:
+            addCustomControl(CHECKBOX_LINK);
+            addCustomControl(CHECKBOX_PREVIEW);
+            break;
+
+        case FILEOPEN_PREVIEW:
+            addCustomControl(CHECKBOX_PREVIEW);
+            break;
+
+        default:
+            SAL_INFO("vcl.gtkkde5", "unknown templates " << templateId);
+            return;
+    }
+
+    setTitle(getResString(saveDialog ? STR_FILEDLG_SAVE : STR_FILEDLG_OPEN));
+
+    m_ipc.sendCommand(Commands::Initialize, saveDialog);
+}
+
+void SAL_CALL Gtk3KDE5FilePicker::cancel()
+{
+    // TODO
+}
+
+void Gtk3KDE5FilePicker::disposing(const lang::EventObject& rEvent)
+{
+    uno::Reference<XFilePickerListener> xFilePickerListener(rEvent.Source, uno::UNO_QUERY);
+
+    if (xFilePickerListener.is())
+    {
+        removeFilePickerListener(xFilePickerListener);
+    }
+}
+
+OUString SAL_CALL Gtk3KDE5FilePicker::getImplementationName() { return FILE_PICKER_IMPL_NAME; }
+
+sal_Bool SAL_CALL Gtk3KDE5FilePicker::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+uno::Sequence<OUString> SAL_CALL Gtk3KDE5FilePicker::getSupportedServiceNames()
+{
+    return FilePicker_getSupportedServiceNames();
+}
+
+void Gtk3KDE5FilePicker::filterChanged()
+{
+    FilePickerEvent aEvent;
+    aEvent.ElementId = LISTBOX_FILTER;
+    SAL_INFO("vcl.gtkkde5", "filter changed");
+    if (m_xListener.is())
+        m_xListener->controlStateChanged(aEvent);
+}
+
+void Gtk3KDE5FilePicker::selectionChanged()
+{
+    FilePickerEvent aEvent;
+    SAL_INFO("vcl.gtkkde5", "file selection changed");
+    if (m_xListener.is())
+        m_xListener->fileSelectionChanged(aEvent);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker.hxx b/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker.hxx
new file mode 100644
index 000000000..7ce391004
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker.hxx
@@ -0,0 +1,131 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <cppuhelper/compbase.hxx>
+
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/ui/dialogs/XFilePicker3.hpp>
+#include <com/sun/star/ui/dialogs/XFilePickerControlAccess.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include <osl/mutex.hxx>
+
+#include "gtk3_kde5_filepicker_ipc.hxx"
+
+typedef ::cppu::WeakComponentImplHelper<css::ui::dialogs::XFilePicker3,
+                                        css::ui::dialogs::XFilePickerControlAccess
+                                        // TODO css::ui::dialogs::XFilePreview
+                                        ,
+                                        css::lang::XInitialization, css::lang::XServiceInfo>
+    Gtk3KDE5FilePicker_Base;
+
+class Gtk3KDE5FilePicker : public Gtk3KDE5FilePicker_Base
+{
+protected:
+    css::uno::Reference<css::ui::dialogs::XFilePickerListener> m_xListener;
+
+    osl::Mutex _helperMutex;
+    Gtk3KDE5FilePickerIpc m_ipc;
+
+public:
+    explicit Gtk3KDE5FilePicker(const css::uno::Reference<css::uno::XComponentContext>&);
+    virtual ~Gtk3KDE5FilePicker() override;
+
+    // XFilePickerNotifier
+    virtual void SAL_CALL addFilePickerListener(
+        const css::uno::Reference<css::ui::dialogs::XFilePickerListener>& xListener) override;
+    virtual void SAL_CALL removeFilePickerListener(
+        const css::uno::Reference<css::ui::dialogs::XFilePickerListener>& xListener) override;
+
+    // XExecutableDialog functions
+    virtual void SAL_CALL setTitle(const OUString& rTitle) override;
+    virtual sal_Int16 SAL_CALL execute() override;
+
+    // XFilePicker functions
+    virtual void SAL_CALL setMultiSelectionMode(sal_Bool bMode) override;
+    virtual void SAL_CALL setDefaultName(const OUString& rName) override;
+    virtual void SAL_CALL setDisplayDirectory(const OUString& rDirectory) override;
+    virtual OUString SAL_CALL getDisplayDirectory() override;
+    virtual css::uno::Sequence<OUString> SAL_CALL getFiles() override;
+
+    // XFilterManager functions
+    virtual void SAL_CALL appendFilter(const OUString& rTitle, const OUString& rFilter) override;
+    virtual void SAL_CALL setCurrentFilter(const OUString& rTitle) override;
+    virtual OUString SAL_CALL getCurrentFilter() override;
+
+    // XFilterGroupManager functions
+    virtual void SAL_CALL
+    appendFilterGroup(const OUString& rGroupTitle,
+                      const css::uno::Sequence<css::beans::StringPair>& rFilters) override;
+
+    // XFilePickerControlAccess functions
+    virtual void SAL_CALL setValue(sal_Int16 nControlId, sal_Int16 nControlAction,
+                                   const css::uno::Any& rValue) override;
+    virtual css::uno::Any SAL_CALL getValue(sal_Int16 nControlId,
+                                            sal_Int16 nControlAction) override;
+    virtual void SAL_CALL enableControl(sal_Int16 nControlId, sal_Bool bEnable) override;
+    virtual void SAL_CALL setLabel(sal_Int16 nControlId, const OUString& rLabel) override;
+    virtual OUString SAL_CALL getLabel(sal_Int16 nControlId) override;
+
+    /* TODO XFilePreview
+
+    virtual css::uno::Sequence< sal_Int16 > SAL_CALL getSupportedImageFormats(  );
+    virtual sal_Int32 SAL_CALL  getTargetColorDepth(  );
+    virtual sal_Int32 SAL_CALL  getAvailableWidth(  );
+    virtual sal_Int32 SAL_CALL  getAvailableHeight(  );
+    virtual void SAL_CALL       setImage( sal_Int16 aImageFormat, const css::uno::Any &rImage );
+    virtual sal_Bool SAL_CALL   setShowState( sal_Bool bShowState );
+    virtual sal_Bool SAL_CALL   getShowState(  );
+    */
+
+    // XFilePicker2 functions
+    virtual css::uno::Sequence<OUString> SAL_CALL getSelectedFiles() override;
+
+    // XInitialization
+    virtual void SAL_CALL initialize(const css::uno::Sequence<css::uno::Any>& rArguments) override;
+
+    // XCancellable
+    virtual void SAL_CALL cancel() override;
+
+    // XEventListener
+    virtual void disposing(const css::lang::EventObject& rEvent);
+    using cppu::WeakComponentImplHelperBase::disposing;
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService(const OUString& rServiceName) override;
+    virtual css::uno::Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+
+private:
+    Gtk3KDE5FilePicker(const Gtk3KDE5FilePicker&) = delete;
+    Gtk3KDE5FilePicker& operator=(const Gtk3KDE5FilePicker&) = delete;
+
+    //add a custom control widget to the file dialog
+    void addCustomControl(sal_Int16 controlId);
+
+    // emit XFilePickerListener controlStateChanged event
+    void filterChanged();
+    // emit XFilePickerListener fileSelectionChanged event
+    void selectionChanged();
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker_ipc.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker_ipc.cxx
new file mode 100644
index 000000000..f9b0da12c
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker_ipc.cxx
@@ -0,0 +1,277 @@
+/* -*- 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 <string_view>
+
+#include "gtk3_kde5_filepicker_ipc.hxx"
+
+#undef Region
+
+#include <system_error>
+
+#include <com/sun/star/ui/dialogs/ExecutableDialogResults.hpp>
+
+#include <vcl/svapp.hxx>
+#include <vcl/sysdata.hxx>
+#include <vcl/weld.hxx>
+
+#include <osl/file.h>
+#include <osl/process.h>
+
+#include <gtk/gtk.h>
+
+#include <boost/filesystem/path.hpp>
+
+#include <fpicker/fpsofficeResMgr.hxx>
+
+using namespace ::com::sun::star::ui::dialogs;
+
+// helper functions
+
+namespace
+{
+OUString applicationDirPath()
+{
+    OUString applicationFilePath;
+    osl_getExecutableFile(&applicationFilePath.pData);
+    OUString applicationSystemPath;
+    osl_getSystemPathFromFileURL(applicationFilePath.pData, &applicationSystemPath.pData);
+    const auto utf8Path = applicationSystemPath.toUtf8();
+    auto ret = boost::filesystem::path(utf8Path.getStr(), utf8Path.getStr() + utf8Path.getLength());
+    ret.remove_filename();
+    return OUString::fromUtf8(std::string_view(ret.c_str()));
+}
+
+OUString findPickerExecutable()
+{
+    const auto path = applicationDirPath();
+    const OUString app("lo_kde5filepicker");
+    OUString ret;
+    osl_searchFileURL(app.pData, path.pData, &ret.pData);
+    if (ret.isEmpty())
+        throw std::system_error(std::make_error_code(std::errc::no_such_file_or_directory),
+                                "could not find lo_kde5filepicker executable");
+    return ret;
+}
+}
+
+void readIpcArg(std::istream& stream, OUString& str)
+{
+    const auto buffer = readIpcStringArg(stream);
+    str = OUString::fromUtf8(std::string_view(buffer.data(), buffer.size()));
+}
+
+void readIpcArg(std::istream& stream, css::uno::Sequence<OUString>& seq)
+{
+    uint32_t numFiles = 0;
+    stream >> numFiles;
+    stream.ignore(); // skip space;
+    seq.realloc(numFiles);
+    OUString* pSeq = seq.getArray();
+    for (size_t i = 0; i < numFiles; ++i)
+    {
+        readIpcArg(stream, pSeq[i]);
+    }
+}
+
+void sendIpcArg(std::ostream& stream, const OUString& string)
+{
+    const auto utf8 = string.toUtf8();
+    sendIpcStringArg(stream, utf8.getLength(), utf8.getStr());
+}
+
+OUString getResString(TranslateId pResId)
+{
+    if (!pResId)
+        return {};
+
+    return FpsResId(pResId);
+}
+
+// handles the IPC commands for dialog execution and ends the dummy Gtk dialog once the IPC response is there
+static void handleIpcForExecute(Gtk3KDE5FilePickerIpc* pFilePickerIpc, GtkWidget* pDummyDialog,
+                                bool* bResult)
+{
+    auto id = pFilePickerIpc->sendCommand(Commands::Execute);
+    pFilePickerIpc->readResponse(id, *bResult);
+
+    // end the dummy dialog
+    gtk_widget_hide(pDummyDialog);
+}
+
+// Gtk3KDE5FilePicker
+
+Gtk3KDE5FilePickerIpc::Gtk3KDE5FilePickerIpc()
+{
+    const auto exe = findPickerExecutable();
+    oslProcessError result;
+    oslSecurity pSecurity = osl_getCurrentSecurity();
+    result = osl_executeProcess_WithRedirectedIO(exe.pData, nullptr, 0, osl_Process_NORMAL,
+                                                 pSecurity, nullptr, nullptr, 0, &m_process,
+                                                 &m_inputWrite, &m_outputRead, nullptr);
+    osl_freeSecurityHandle(pSecurity);
+    if (result != osl_Process_E_None)
+        throw std::system_error(std::make_error_code(std::errc::no_such_process),
+                                "could not start lo_kde5filepicker executable");
+}
+
+Gtk3KDE5FilePickerIpc::~Gtk3KDE5FilePickerIpc()
+{
+    if (!m_process)
+        return;
+
+    sendCommand(Commands::Quit);
+    osl_joinProcess(m_process);
+
+    if (m_inputWrite)
+        osl_closeFile(m_inputWrite);
+    if (m_outputRead)
+        osl_closeFile(m_outputRead);
+    osl_freeProcessHandle(m_process);
+}
+
+sal_Int16 Gtk3KDE5FilePickerIpc::execute()
+{
+    auto restoreMainWindow = blockMainWindow();
+
+    // dummy gtk dialog that will take care of processing events,
+    // not meant to be actually seen by user
+    GtkWidget* pDummyDialog = gtk_dialog_new();
+
+    bool accepted = false;
+
+    // send IPC command and read response in a separate thread
+    std::thread aIpcHandler(&handleIpcForExecute, this, pDummyDialog, &accepted);
+
+    // make dummy dialog not to be seen by user
+    gtk_window_set_decorated(GTK_WINDOW(pDummyDialog), false);
+    gtk_window_set_default_size(GTK_WINDOW(pDummyDialog), 0, 0);
+    gtk_window_set_accept_focus(GTK_WINDOW(pDummyDialog), false);
+    // gtk_widget_set_opacity() only has the desired effect when widget is already shown
+    gtk_widget_show(pDummyDialog);
+    gtk_widget_set_opacity(pDummyDialog, 0);
+    // run dialog, leaving event processing to GTK
+    // dialog will be closed by the separate 'aIpcHandler' thread once the IPC response is there
+    gtk_dialog_run(GTK_DIALOG(pDummyDialog));
+
+    aIpcHandler.join();
+
+    gtk_widget_destroy(pDummyDialog);
+
+    if (restoreMainWindow)
+        restoreMainWindow();
+
+    return accepted ? ExecutableDialogResults::OK : ExecutableDialogResults::CANCEL;
+}
+
+static gboolean ignoreDeleteEvent(GtkWidget* /*widget*/, GdkEvent* /*event*/,
+                                  gpointer /*user_data*/)
+{
+    return true;
+}
+
+std::function<void()> Gtk3KDE5FilePickerIpc::blockMainWindow()
+{
+    weld::Window* pParentWin = Application::GetDefDialogParent();
+    if (!pParentWin)
+        return {};
+
+    const SystemEnvData aSysData = pParentWin->get_system_data();
+    auto* pMainWindow = static_cast<GtkWidget*>(aSysData.pWidget);
+    if (!pMainWindow)
+        return {};
+
+    sendCommand(Commands::SetWinId, aSysData.GetWindowHandle(aSysData.pSalFrame));
+
+    SolarMutexGuard guard;
+    auto deleteEventSignalId = g_signal_lookup("delete_event", gtk_widget_get_type());
+
+    // disable the mainwindow
+    gtk_widget_set_sensitive(pMainWindow, false);
+
+    // block the GtkSalFrame delete_event handler
+    auto blockedHandler = g_signal_handler_find(
+        pMainWindow, static_cast<GSignalMatchType>(G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_DATA),
+        deleteEventSignalId, 0, nullptr, nullptr, aSysData.pSalFrame);
+    g_signal_handler_block(pMainWindow, blockedHandler);
+
+    // prevent the window from being closed
+    auto ignoreDeleteEventHandler
+        = g_signal_connect(pMainWindow, "delete_event", G_CALLBACK(ignoreDeleteEvent), nullptr);
+
+    return [pMainWindow, ignoreDeleteEventHandler, blockedHandler] {
+        SolarMutexGuard cleanupGuard;
+        // re-enable window
+        gtk_widget_set_sensitive(pMainWindow, true);
+
+        // allow it to be closed again
+        g_signal_handler_disconnect(pMainWindow, ignoreDeleteEventHandler);
+
+        // unblock the GtkSalFrame handler
+        g_signal_handler_unblock(pMainWindow, blockedHandler);
+    };
+}
+
+void Gtk3KDE5FilePickerIpc::writeResponseLine(const std::string& line)
+{
+    sal_uInt64 bytesWritten = 0;
+    osl_writeFile(m_inputWrite, line.c_str(), line.size(), &bytesWritten);
+}
+
+std::string Gtk3KDE5FilePickerIpc::readResponseLine()
+{
+    if (!m_responseBuffer.empty()) // check whether we have a line in our buffer
+    {
+        std::size_t it = m_responseBuffer.find('\n');
+        if (it != std::string::npos)
+        {
+            auto ret = m_responseBuffer.substr(0, it);
+            m_responseBuffer.erase(0, it + 1);
+            return ret;
+        }
+    }
+
+    const sal_uInt64 BUF_SIZE = 1024;
+    char buffer[BUF_SIZE];
+    while (true)
+    {
+        sal_uInt64 bytesRead = 0;
+        auto err = osl_readFile(m_outputRead, buffer, BUF_SIZE, &bytesRead);
+        auto it = std::find(buffer, buffer + bytesRead, '\n');
+        if (it != buffer + bytesRead) // check whether the chunk we read contains an EOL
+        {
+            // if so, append that part to the buffer and return it
+            std::string ret = m_responseBuffer.append(buffer, it);
+            // but keep anything else we may have read in our buffer
+            ++it;
+            m_responseBuffer.assign(it, buffer + bytesRead);
+            return ret;
+        }
+        // otherwise append everything we read to the buffer and try again
+        m_responseBuffer.append(buffer, bytesRead);
+
+        if (err != osl_File_E_None && err != osl_File_E_AGAIN)
+            break;
+    }
+    return {};
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker_ipc.hxx b/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker_ipc.hxx
new file mode 100644
index 000000000..58ca3eb45
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_filepicker_ipc.hxx
@@ -0,0 +1,135 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <osl/process.h>
+#include <unotools/resmgr.hxx>
+
+#include "filepicker_ipc_commands.hxx"
+
+#include <functional>
+#include <mutex>
+#include <thread>
+#include <sstream>
+
+OUString getResString(TranslateId pResId);
+
+class Gtk3KDE5FilePickerIpc
+{
+protected:
+    oslProcess m_process;
+    oslFileHandle m_inputWrite;
+    oslFileHandle m_outputRead;
+    // simple multiplexing: every command gets its own ID that can be used to
+    // read the corresponding response
+    uint64_t m_msgId = 1;
+    std::mutex m_mutex;
+    uint64_t m_incomingResponse = 0;
+    std::string m_responseBuffer;
+    std::stringstream m_responseStream;
+
+public:
+    explicit Gtk3KDE5FilePickerIpc();
+    ~Gtk3KDE5FilePickerIpc();
+
+    sal_Int16 execute();
+
+    void writeResponseLine(const std::string& line);
+
+    template <typename... Args> uint64_t sendCommand(Commands command, const Args&... args)
+    {
+        auto id = m_msgId;
+        ++m_msgId;
+        std::stringstream stream;
+        sendIpcArgs(stream, id, command, args...);
+        writeResponseLine(stream.str());
+        return id;
+    }
+
+    std::string readResponseLine();
+
+    // workaround gcc <= 4.8 bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55914
+    template <int...> struct seq
+    {
+    };
+    template <int N, int... S> struct gens : gens<N - 1, N - 1, S...>
+    {
+    };
+    template <int... S> struct gens<0, S...>
+    {
+        typedef seq<S...> type;
+    };
+    template <typename... Args> struct ArgsReader
+    {
+        ArgsReader(Args&... args)
+            : m_args(args...)
+        {
+        }
+
+        void operator()(std::istream& stream)
+        {
+            callFunc(stream, typename gens<sizeof...(Args)>::type());
+        }
+
+    private:
+        template <int... S> void callFunc(std::istream& stream, seq<S...>)
+        {
+            readIpcArgs(stream, std::get<S>(m_args)...);
+        }
+
+        std::tuple<Args&...> m_args;
+    };
+
+    template <typename... Args> void readResponse(uint64_t id, Args&... args)
+    {
+        ArgsReader<Args...> argsReader(args...);
+        while (true)
+        {
+            // only let one thread read at any given time
+            std::scoped_lock<std::mutex> lock(m_mutex);
+
+            // check if we need to read (and potentially wait) a response ID
+            if (m_incomingResponse == 0)
+            {
+                m_responseStream.clear();
+                m_responseStream.str(readResponseLine());
+                readIpcArgs(m_responseStream, m_incomingResponse);
+            }
+
+            if (m_incomingResponse == id)
+            {
+                // the response we are waiting for came in
+                argsReader(m_responseStream);
+                m_incomingResponse = 0;
+                break;
+            }
+            else
+            {
+                // the next response answers some other request, yield
+                std::this_thread::yield();
+            }
+        }
+    }
+
+private:
+    std::function<void()> blockMainWindow();
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_folderpicker.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_folderpicker.cxx
new file mode 100644
index 000000000..c1569e6be
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_folderpicker.cxx
@@ -0,0 +1,85 @@
+/* -*- 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 "gtk3_kde5_folderpicker.hxx"
+
+#include <vcl/svapp.hxx>
+
+#include <fpicker/strings.hrc>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::ui::dialogs;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::uno;
+
+// constructor
+
+Gtk3KDE5FolderPicker::Gtk3KDE5FolderPicker(
+    const uno::Reference<uno::XComponentContext>& /*xContext*/)
+{
+    m_ipc.sendCommand(Commands::EnablePickFolderMode);
+    setTitle(getResString(STR_SVT_FOLDERPICKER_DEFAULT_TITLE));
+}
+
+Gtk3KDE5FolderPicker::~Gtk3KDE5FolderPicker() = default;
+
+void SAL_CALL Gtk3KDE5FolderPicker::setDisplayDirectory(const OUString& aDirectory)
+{
+    m_ipc.sendCommand(Commands::SetDisplayDirectory, aDirectory);
+}
+
+OUString SAL_CALL Gtk3KDE5FolderPicker::getDisplayDirectory()
+{
+    auto id = m_ipc.sendCommand(Commands::GetDisplayDirectory);
+    OUString ret;
+    m_ipc.readResponse(id, ret);
+    return ret;
+}
+
+OUString SAL_CALL Gtk3KDE5FolderPicker::getDirectory()
+{
+    auto id = m_ipc.sendCommand(Commands::GetSelectedFiles);
+    uno::Sequence<OUString> seq;
+    m_ipc.readResponse(id, seq);
+    return seq.hasElements() ? seq[0] : OUString();
+}
+
+void SAL_CALL Gtk3KDE5FolderPicker::setDescription(const OUString& /*rDescription*/) {}
+
+// XExecutableDialog functions
+
+void SAL_CALL Gtk3KDE5FolderPicker::setTitle(const OUString& aTitle)
+{
+    m_ipc.sendCommand(Commands::SetTitle, aTitle);
+}
+
+sal_Int16 SAL_CALL Gtk3KDE5FolderPicker::execute()
+{
+    SolarMutexGuard g;
+    return m_ipc.execute();
+}
+
+// XCancellable
+
+void SAL_CALL Gtk3KDE5FolderPicker::cancel()
+{
+    // TODO
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_folderpicker.hxx b/vcl/unx/gtk3_kde5/gtk3_kde5_folderpicker.hxx
new file mode 100644
index 000000000..9801a072a
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_folderpicker.hxx
@@ -0,0 +1,59 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <rtl/ustring.hxx>
+#include <cppuhelper/implbase.hxx>
+
+#include <com/sun/star/ui/dialogs/XFolderPicker2.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include "gtk3_kde5_filepicker_ipc.hxx"
+
+class Gtk3KDE5FolderPicker : public cppu::WeakImplHelper<css::ui::dialogs::XFolderPicker2>
+{
+protected:
+    Gtk3KDE5FilePickerIpc m_ipc;
+
+public:
+    // constructor
+    explicit Gtk3KDE5FolderPicker(
+        const css::uno::Reference<css::uno::XComponentContext>& xServiceMgr);
+    virtual ~Gtk3KDE5FolderPicker() override;
+
+    // XExecutableDialog functions
+    virtual void SAL_CALL setTitle(const OUString& aTitle) override;
+    virtual sal_Int16 SAL_CALL execute() override;
+
+    // XFolderPicker functions
+    virtual void SAL_CALL setDisplayDirectory(const OUString& rDirectory) override;
+    virtual OUString SAL_CALL getDisplayDirectory() override;
+    virtual OUString SAL_CALL getDirectory() override;
+    virtual void SAL_CALL setDescription(const OUString& rDescription) override;
+
+    // XCancellable
+    virtual void SAL_CALL cancel() override;
+
+private:
+    Gtk3KDE5FolderPicker(const Gtk3KDE5FolderPicker&) = delete;
+    Gtk3KDE5FolderPicker& operator=(const Gtk3KDE5FolderPicker&) = delete;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_gloactiongroup.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_gloactiongroup.cxx
new file mode 100644
index 000000000..eccf49d3d
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_gloactiongroup.cxx
@@ -0,0 +1,22 @@
+/* -*- 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 "../gtk3/gloactiongroup.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_glomenu.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_glomenu.cxx
new file mode 100644
index 000000000..979c9fba0
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_glomenu.cxx
@@ -0,0 +1,22 @@
+/* -*- 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 "../gtk3/glomenu.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_gtkdata.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_gtkdata.cxx
new file mode 100644
index 000000000..f03dce99a
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_gtkdata.cxx
@@ -0,0 +1,22 @@
+/* -*- 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 "../gtk3/gtkdata.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_gtkframe.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_gtkframe.cxx
new file mode 100644
index 000000000..8d8a07a3f
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_gtkframe.cxx
@@ -0,0 +1,22 @@
+/* -*- 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 "../gtk3/gtkframe.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_gtkinst.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_gtkinst.cxx
new file mode 100644
index 000000000..dd6aace5d
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_gtkinst.cxx
@@ -0,0 +1,57 @@
+/* -*- 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 .
+ */
+
+// make gtk3 plug advertise correctly as kde5 hybrid
+#define GTK_TOOLKIT_NAME "gtk3_kde5"
+#include "../gtk3/gtkinst.cxx"
+
+#include "gtk3_kde5_filepicker.hxx"
+#include "gtk3_kde5_folderpicker.hxx"
+
+#include <system_error>
+
+uno::Reference<ui::dialogs::XFilePicker2>
+GtkInstance::createFilePicker(const uno::Reference<uno::XComponentContext>& xMSF)
+{
+    try
+    {
+        return uno::Reference<ui::dialogs::XFilePicker2>(new Gtk3KDE5FilePicker(xMSF));
+    }
+    catch (const std::system_error& error)
+    {
+        OSL_FAIL(error.what());
+        return { nullptr };
+    }
+}
+
+uno::Reference<ui::dialogs::XFolderPicker2>
+GtkInstance::createFolderPicker(const uno::Reference<uno::XComponentContext>& xMSF)
+{
+    try
+    {
+        return uno::Reference<ui::dialogs::XFolderPicker2>(new Gtk3KDE5FolderPicker(xMSF));
+    }
+    catch (const std::system_error& error)
+    {
+        OSL_FAIL(error.what());
+        return { nullptr };
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_gtkobject.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_gtkobject.cxx
new file mode 100644
index 000000000..948c6bd3a
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_gtkobject.cxx
@@ -0,0 +1,22 @@
+/* -*- 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 "../gtk3/gtkobject.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_gtksalmenu.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_gtksalmenu.cxx
new file mode 100644
index 000000000..7963e6b60
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_gtksalmenu.cxx
@@ -0,0 +1,22 @@
+/* -*- 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 "../gtk3/gtksalmenu.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_gtksys.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_gtksys.cxx
new file mode 100644
index 000000000..3f3ad9f1d
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_gtksys.cxx
@@ -0,0 +1,22 @@
+/* -*- 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 "../gtk3/gtksys.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_hudawareness.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_hudawareness.cxx
new file mode 100644
index 000000000..e0b8f1812
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_hudawareness.cxx
@@ -0,0 +1,22 @@
+/* -*- 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 "../gtk3/hudawareness.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/gtk3_kde5_salnativewidgets-gtk.cxx b/vcl/unx/gtk3_kde5/gtk3_kde5_salnativewidgets-gtk.cxx
new file mode 100644
index 000000000..428ff8204
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/gtk3_kde5_salnativewidgets-gtk.cxx
@@ -0,0 +1,22 @@
+/* -*- 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 "../gtk3/salnativewidgets-gtk.cxx"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/kde5_filepicker.cxx b/vcl/unx/gtk3_kde5/kde5_filepicker.cxx
new file mode 100644
index 000000000..b3382b33d
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/kde5_filepicker.cxx
@@ -0,0 +1,287 @@
+/* -*- 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 <vcl/svapp.hxx>
+
+#include "kde5_filepicker.hxx"
+
+#include <KWindowSystem>
+#include <KFileWidget>
+
+#include <QtCore/QDebug>
+#include <QtCore/QUrl>
+#include <QtWidgets/QCheckBox>
+#include <QtWidgets/QFileDialog>
+#include <QtWidgets/QGridLayout>
+#include <QtWidgets/QWidget>
+#include <QtWidgets/QApplication>
+
+// KDE5FilePicker
+
+KDE5FilePicker::KDE5FilePicker(QObject* parent)
+    : QObject(parent)
+    , _dialog(new QFileDialog(nullptr, {}, QDir::homePath()))
+    , _extraControls(new QWidget)
+    , _layout(new QGridLayout(_extraControls))
+    , _winId(0)
+{
+    _dialog->setSupportedSchemes({
+        QStringLiteral("file"), QStringLiteral("ftp"), QStringLiteral("http"),
+        QStringLiteral("https"), QStringLiteral("webdav"), QStringLiteral("webdavs"),
+        QStringLiteral("smb"),
+        QStringLiteral(""), // this makes removable devices shown
+    });
+
+    setMultiSelectionMode(false);
+
+    connect(_dialog, &QFileDialog::filterSelected, this, &KDE5FilePicker::filterChanged);
+    connect(_dialog, &QFileDialog::fileSelected, this, &KDE5FilePicker::selectionChanged);
+
+    setupCustomWidgets();
+}
+
+void KDE5FilePicker::enableFolderMode()
+{
+    _dialog->setOption(QFileDialog::ShowDirsOnly, true);
+    // Workaround for https://bugs.kde.org/show_bug.cgi?id=406464 :
+    // Don't set file mode to QFileDialog::Directory when native KDE Plasma 5
+    // file dialog is used, since clicking on directory "bar" inside directory "foo"
+    // and then confirming would return "foo" rather than "foo/bar";
+    // on the other hand, non-native file dialog needs 'QFileDialog::Directory'
+    // and doesn't allow folder selection otherwise
+    if (Application::GetDesktopEnvironment() != "PLASMA5")
+    {
+        _dialog->setFileMode(QFileDialog::Directory);
+    }
+}
+
+KDE5FilePicker::~KDE5FilePicker()
+{
+    delete _extraControls;
+    delete _dialog;
+}
+
+void KDE5FilePicker::setTitle(const QString& title) { _dialog->setWindowTitle(title); }
+
+bool KDE5FilePicker::execute()
+{
+    if (!_filters.isEmpty())
+        _dialog->setNameFilters(_filters);
+    if (!_currentFilter.isEmpty())
+        _dialog->selectNameFilter(_currentFilter);
+
+    _dialog->show();
+    //block and wait for user input
+    return _dialog->exec() == QFileDialog::Accepted;
+}
+
+void KDE5FilePicker::setMultiSelectionMode(bool multiSelect)
+{
+    if (_dialog->acceptMode() == QFileDialog::AcceptSave)
+        return;
+
+    _dialog->setFileMode(multiSelect ? QFileDialog::ExistingFiles : QFileDialog::ExistingFile);
+}
+
+void KDE5FilePicker::setDefaultName(const QString& name) { _dialog->selectFile(name); }
+
+void KDE5FilePicker::setDisplayDirectory(const QString& dir)
+{
+    _dialog->setDirectoryUrl(QUrl(dir));
+}
+
+QString KDE5FilePicker::getDisplayDirectory() const { return _dialog->directoryUrl().url(); }
+
+QList<QUrl> KDE5FilePicker::getSelectedFiles() const { return _dialog->selectedUrls(); }
+
+void KDE5FilePicker::appendFilter(const QString& title, const QString& filter)
+{
+    QString t = title;
+    QString f = filter;
+    // '/' need to be escaped else they are assumed to be mime types by kfiledialog
+    //see the docs
+    t.replace("/", "\\/");
+
+    // openoffice gives us filters separated by ';' qt dialogs just want space separated
+    f.replace(";", " ");
+
+    // make sure "*.*" is not used as "all files"
+    f.replace("*.*", "*");
+
+    _filters << QStringLiteral("%1 (%2)").arg(t, f);
+    _titleToFilters[t] = _filters.constLast();
+}
+
+void KDE5FilePicker::setCurrentFilter(const QString& title)
+{
+    _currentFilter = _titleToFilters.value(title);
+}
+
+QString KDE5FilePicker::getCurrentFilter() const
+{
+    QString filter = _titleToFilters.key(_dialog->selectedNameFilter());
+
+    //default if not found
+    if (filter.isEmpty())
+        filter = "ODF Text Document (.odt)";
+
+    return filter;
+}
+
+void KDE5FilePicker::setValue(sal_Int16 controlId, sal_Int16 /*nControlAction*/, bool value)
+{
+    if (_customWidgets.contains(controlId))
+    {
+        QCheckBox* cb = dynamic_cast<QCheckBox*>(_customWidgets.value(controlId));
+        if (cb)
+            cb->setChecked(value);
+    }
+    else
+        qWarning() << "set value on unknown control" << controlId;
+}
+
+bool KDE5FilePicker::getValue(sal_Int16 controlId, sal_Int16 /*nControlAction*/) const
+{
+    bool ret = false;
+    if (_customWidgets.contains(controlId))
+    {
+        QCheckBox* cb = dynamic_cast<QCheckBox*>(_customWidgets.value(controlId));
+        if (cb)
+            ret = cb->isChecked();
+    }
+    else
+        qWarning() << "get value on unknown control" << controlId;
+
+    return ret;
+}
+
+void KDE5FilePicker::enableControl(sal_Int16 controlId, bool enable)
+{
+    if (_customWidgets.contains(controlId))
+        _customWidgets.value(controlId)->setEnabled(enable);
+    else
+        qWarning() << "enable on unknown control" << controlId;
+}
+
+void KDE5FilePicker::setLabel(sal_Int16 controlId, const QString& label)
+{
+    if (_customWidgets.contains(controlId))
+    {
+        QCheckBox* cb = dynamic_cast<QCheckBox*>(_customWidgets.value(controlId));
+        if (cb)
+            cb->setText(label);
+    }
+    else
+        qWarning() << "set label on unknown control" << controlId;
+}
+
+QString KDE5FilePicker::getLabel(sal_Int16 controlId) const
+{
+    QString label;
+    if (_customWidgets.contains(controlId))
+    {
+        QCheckBox* cb = dynamic_cast<QCheckBox*>(_customWidgets.value(controlId));
+        if (cb)
+            label = cb->text();
+    }
+    else
+        qWarning() << "get label on unknown control" << controlId;
+
+    return label;
+}
+
+void KDE5FilePicker::addCheckBox(sal_Int16 controlId, const QString& label, bool hidden)
+{
+    auto resString = label;
+    resString.replace('~', '&');
+
+    auto widget = new QCheckBox(resString, _extraControls);
+    widget->setHidden(hidden);
+    if (!hidden)
+    {
+        _layout->addWidget(widget);
+    }
+    _customWidgets.insert(controlId, widget);
+}
+
+void KDE5FilePicker::initialize(bool saveDialog)
+{
+    //default is opening
+    QFileDialog::AcceptMode operationMode
+        = saveDialog ? QFileDialog::AcceptSave : QFileDialog::AcceptOpen;
+
+    _dialog->setAcceptMode(operationMode);
+
+    if (saveDialog)
+        _dialog->setFileMode(QFileDialog::AnyFile);
+}
+
+void KDE5FilePicker::setWinId(sal_uInt64 winId) { _winId = winId; }
+
+void KDE5FilePicker::setupCustomWidgets()
+{
+    // When using the platform-native Plasma/KDE5 file picker, we currently rely on KFileWidget
+    // being present to add the custom controls visible (s. 'eventFilter' method).
+    // Since this doesn't work for other desktop environments, use a non-native
+    // dialog there in order not to lose the custom controls and insert the custom
+    // widget in the layout returned by QFileDialog::layout()
+    // (which returns nullptr for native file dialogs)
+    if (Application::GetDesktopEnvironment() == "PLASMA5")
+    {
+        qApp->installEventFilter(this);
+    }
+    else
+    {
+        _dialog->setOption(QFileDialog::DontUseNativeDialog);
+        QGridLayout* pLayout = static_cast<QGridLayout*>(_dialog->layout());
+        assert(pLayout);
+        const int row = pLayout->rowCount();
+        pLayout->addWidget(_extraControls, row, 1);
+    }
+}
+
+bool KDE5FilePicker::eventFilter(QObject* o, QEvent* e)
+{
+    if (e->type() == QEvent::Show && o->isWidgetType())
+    {
+        auto* w = static_cast<QWidget*>(o);
+        if (!w->parentWidget() && w->isModal())
+        {
+            /*
+             To replace when baseline will include kwindowsystem >= 5.62 with:
+             w->setAttribute(Qt::WA_NativeWindow, true);
+             KWindowSystem::setMainWindow(w->windowHandle(), _winId);
+            */
+            SAL_WNODEPRECATED_DECLARATIONS_PUSH
+            KWindowSystem::setMainWindow(w, _winId);
+            SAL_WNODEPRECATED_DECLARATIONS_POP
+            if (auto* fileWidget = w->findChild<KFileWidget*>({}, Qt::FindDirectChildrenOnly))
+            {
+                fileWidget->setCustomWidget(_extraControls);
+                // remove event filter again; the only purpose was to set the custom widget here
+                qApp->removeEventFilter(this);
+            }
+        }
+    }
+    return QObject::eventFilter(o, e);
+}
+
+#include <kde5_filepicker.moc>
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/kde5_filepicker.hxx b/vcl/unx/gtk3_kde5/kde5_filepicker.hxx
new file mode 100644
index 000000000..74f94d222
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/kde5_filepicker.hxx
@@ -0,0 +1,110 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <QtCore/QObject>
+#include <QtCore/QString>
+#include <QtCore/QStringList>
+#include <QtCore/QHash>
+
+#include <sal/types.h>
+
+class QFileDialog;
+class QWidget;
+class QGridLayout;
+
+class KDE5FilePicker : public QObject
+{
+    Q_OBJECT
+protected:
+    //the dialog to display
+    QFileDialog* _dialog;
+
+    //running filter string to add to dialog
+    QStringList _filters;
+    // map of filter titles to full filter for selection
+    QHash<QString, QString> _titleToFilters;
+    // string to set the current filter
+    QString _currentFilter;
+
+    //mapping of SAL control ID's to created custom controls
+    QHash<sal_Int16, QWidget*> _customWidgets;
+
+    //widget to contain extra custom controls
+    QWidget* _extraControls;
+
+    //layout for extra custom controls
+    QGridLayout* _layout;
+
+    sal_uInt64 _winId;
+
+public:
+    explicit KDE5FilePicker(QObject* parent = nullptr);
+    ~KDE5FilePicker() override;
+
+    void enableFolderMode();
+
+    // XExecutableDialog functions
+    void setTitle(const QString& rTitle);
+    bool execute();
+
+    // XFilePicker functions
+    void setMultiSelectionMode(bool bMode);
+    void setDefaultName(const QString& rName);
+    void setDisplayDirectory(const QString& rDirectory);
+    QString getDisplayDirectory() const;
+
+    // XFilterManager functions
+    void appendFilter(const QString& rTitle, const QString& rFilter);
+    void setCurrentFilter(const QString& rTitle);
+    QString getCurrentFilter() const;
+
+    // XFilePickerControlAccess functions
+    void setValue(sal_Int16 nControlId, sal_Int16 nControlAction, bool rValue);
+    bool getValue(sal_Int16 nControlId, sal_Int16 nControlAction) const;
+    void enableControl(sal_Int16 nControlId, bool bEnable);
+    void setLabel(sal_Int16 nControlId, const QString& rLabel);
+    QString getLabel(sal_Int16 nControlId) const;
+
+    // XFilePicker2 functions
+    QList<QUrl> getSelectedFiles() const;
+
+    // XInitialization
+    void initialize(bool saveDialog);
+
+    //add a custom control widget to the file dialog
+    void addCheckBox(sal_Int16 nControlId, const QString& label, bool hidden);
+
+    void setWinId(sal_uInt64 winId);
+
+private:
+    Q_DISABLE_COPY(KDE5FilePicker)
+    // adds the custom controls to the dialog
+    void setupCustomWidgets();
+
+protected:
+    bool eventFilter(QObject* watched, QEvent* event) override;
+
+Q_SIGNALS:
+    void filterChanged();
+    void selectionChanged();
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/kde5_filepicker_ipc.cxx b/vcl/unx/gtk3_kde5/kde5_filepicker_ipc.cxx
new file mode 100644
index 000000000..7f0bfff98
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/kde5_filepicker_ipc.cxx
@@ -0,0 +1,374 @@
+/* -*- 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 "kde5_filepicker_ipc.hxx"
+
+#include <QUrl>
+#include <QApplication>
+#include <QDebug>
+
+#include <iostream>
+
+#include "kde5_filepicker.hxx"
+
+void readIpcArg(std::istream& stream, QString& string)
+{
+    const auto buffer = readIpcStringArg(stream);
+    string = QString::fromUtf8(buffer.data(), buffer.size());
+}
+
+void sendIpcArg(std::ostream& stream, const QString& string)
+{
+    const auto utf8 = string.toUtf8();
+    sendIpcStringArg(stream, utf8.size(), utf8.data());
+}
+
+static void sendIpcArg(std::ostream& stream, const QStringList& list)
+{
+    stream << static_cast<uint32_t>(list.size()) << ' ';
+    for (const auto& entry : list)
+    {
+        sendIpcArg(stream, entry);
+    }
+}
+
+static void readCommandArgs(Commands command, QList<QVariant>& args)
+{
+    switch (command)
+    {
+        case Commands::SetTitle:
+        {
+            QString title;
+            readIpcArgs(std::cin, title);
+            args.append(title);
+            break;
+        }
+        case Commands::SetWinId:
+        {
+            sal_uIntPtr winId = 0;
+            readIpcArgs(std::cin, winId);
+            QVariant aWinIdVariant;
+            aWinIdVariant.setValue(winId);
+            args.append(aWinIdVariant);
+            break;
+        }
+        case Commands::SetMultiSelectionMode:
+        {
+            bool multiSelection = false;
+            readIpcArgs(std::cin, multiSelection);
+            args.append(multiSelection);
+            break;
+        }
+        case Commands::SetDefaultName:
+        {
+            QString name;
+            readIpcArgs(std::cin, name);
+            args.append(name);
+            break;
+        }
+        case Commands::SetDisplayDirectory:
+        {
+            QString dir;
+            readIpcArgs(std::cin, dir);
+            args.append(dir);
+            break;
+        }
+        case Commands::AppendFilter:
+        {
+            QString title, filter;
+            readIpcArgs(std::cin, title, filter);
+            args.append(title);
+            args.append(filter);
+            break;
+        }
+        case Commands::SetCurrentFilter:
+        {
+            QString title;
+            readIpcArgs(std::cin, title);
+            args.append(title);
+            break;
+        }
+        case Commands::SetValue:
+        {
+            sal_Int16 controlId = 0;
+            sal_Int16 nControlAction = 0;
+            bool value = false;
+            readIpcArgs(std::cin, controlId, nControlAction, value);
+            args.append(controlId);
+            args.append(nControlAction);
+            args.append(value);
+            break;
+        }
+        case Commands::GetValue:
+        {
+            sal_Int16 controlId = 0;
+            sal_Int16 nControlAction = 0;
+            readIpcArgs(std::cin, controlId, nControlAction);
+            args.append(controlId);
+            args.append(nControlAction);
+            break;
+        }
+        case Commands::EnableControl:
+        {
+            sal_Int16 controlId = 0;
+            bool enabled = false;
+            readIpcArgs(std::cin, controlId, enabled);
+            args.append(controlId);
+            args.append(enabled);
+            break;
+        }
+        case Commands::SetLabel:
+        {
+            sal_Int16 controlId = 0;
+            QString label;
+            readIpcArgs(std::cin, controlId, label);
+            args.append(controlId);
+            args.append(label);
+            break;
+        }
+        case Commands::GetLabel:
+        {
+            sal_Int16 controlId = 0;
+            readIpcArgs(std::cin, controlId);
+            args.append(controlId);
+            break;
+        }
+        case Commands::AddCheckBox:
+        {
+            sal_Int16 controlId = 0;
+            bool hidden = false;
+            QString label;
+            readIpcArgs(std::cin, controlId, hidden, label);
+            args.append(controlId);
+            args.append(hidden);
+            args.append(label);
+            break;
+        }
+        case Commands::Initialize:
+        {
+            bool saveDialog = false;
+            readIpcArgs(std::cin, saveDialog);
+            args.append(saveDialog);
+            break;
+        }
+        default:
+        {
+            // no extra parameters/arguments
+            break;
+        }
+    };
+}
+
+static void readCommands(FilePickerIpc* ipc)
+{
+    while (!std::cin.eof())
+    {
+        uint64_t messageId = 0;
+        Commands command;
+        readIpcArgs(std::cin, messageId, command);
+
+        // retrieve additional command-specific arguments
+        QList<QVariant> args;
+        readCommandArgs(command, args);
+
+        emit ipc->commandReceived(messageId, command, args);
+
+        // stop processing once 'Quit' command has been sent
+        if (command == Commands::Quit)
+        {
+            return;
+        }
+    }
+}
+
+FilePickerIpc::FilePickerIpc(KDE5FilePicker* filePicker, QObject* parent)
+    : QObject(parent)
+    , m_filePicker(filePicker)
+{
+    // required to be able to pass those via signal/slot
+    qRegisterMetaType<uint64_t>("uint64_t");
+    qRegisterMetaType<Commands>("Commands");
+
+    connect(this, &FilePickerIpc::commandReceived, this, &FilePickerIpc::handleCommand);
+
+    // read IPC commands and their args in a separate thread, so this does not block everything else;
+    // 'commandReceived' signal is emitted every time a command and its args have been read;
+    // thread will run until the filepicker process is terminated
+    m_ipcReaderThread = std::make_unique<std::thread>(readCommands, this);
+}
+
+FilePickerIpc::~FilePickerIpc()
+{
+    // join thread that reads commands
+    m_ipcReaderThread->join();
+};
+
+bool FilePickerIpc::handleCommand(uint64_t messageId, Commands command, QList<QVariant> args)
+{
+    switch (command)
+    {
+        case Commands::SetTitle:
+        {
+            QString title = args.takeFirst().toString();
+            m_filePicker->setTitle(title);
+            return true;
+        }
+        case Commands::SetWinId:
+        {
+            sal_uIntPtr winId = args.takeFirst().value<sal_uIntPtr>();
+            m_filePicker->setWinId(winId);
+            return true;
+        }
+        case Commands::Execute:
+        {
+            sendIpcArgs(std::cout, messageId, m_filePicker->execute());
+            return true;
+        }
+        case Commands::SetMultiSelectionMode:
+        {
+            bool multiSelection = args.takeFirst().toBool();
+            m_filePicker->setMultiSelectionMode(multiSelection);
+            return true;
+        }
+        case Commands::SetDefaultName:
+        {
+            QString name = args.takeFirst().toString();
+            m_filePicker->setDefaultName(name);
+            return true;
+        }
+        case Commands::SetDisplayDirectory:
+        {
+            QString dir = args.takeFirst().toString();
+            m_filePicker->setDisplayDirectory(dir);
+            return true;
+        }
+        case Commands::GetDisplayDirectory:
+        {
+            sendIpcArgs(std::cout, messageId, m_filePicker->getDisplayDirectory());
+            return true;
+        }
+        case Commands::GetSelectedFiles:
+        {
+            QStringList files;
+            for (auto const& url_ : m_filePicker->getSelectedFiles())
+            {
+                auto url = url_;
+                if (url.scheme() == QLatin1String("webdav")
+                    || url.scheme() == QLatin1String("webdavs"))
+                {
+                    // translate webdav and webdavs URLs into a format supported by LO
+                    url.setScheme(QLatin1String("vnd.sun.star.") + url.scheme());
+                }
+                else if (url.scheme() == QLatin1String("smb"))
+                {
+                    // clear the user name - the GIO backend does not support this apparently
+                    // when no username is available, it will ask for the password
+                    url.setUserName({});
+                }
+                files << url.toString();
+            }
+            sendIpcArgs(std::cout, messageId, files);
+            return true;
+        }
+        case Commands::AppendFilter:
+        {
+            QString title = args.takeFirst().toString();
+            QString filter = args.takeFirst().toString();
+            m_filePicker->appendFilter(title, filter);
+            return true;
+        }
+        case Commands::SetCurrentFilter:
+        {
+            QString title = args.takeFirst().toString();
+            m_filePicker->setCurrentFilter(title);
+            return true;
+        }
+        case Commands::GetCurrentFilter:
+        {
+            sendIpcArgs(std::cout, messageId, m_filePicker->getCurrentFilter());
+            return true;
+        }
+        case Commands::SetValue:
+        {
+            sal_Int16 controlId = args.takeFirst().value<sal_Int16>();
+            sal_Int16 nControlAction = args.takeFirst().value<sal_Int16>();
+            bool value = args.takeFirst().toBool();
+            m_filePicker->setValue(controlId, nControlAction, value);
+            return true;
+        }
+        case Commands::GetValue:
+        {
+            sal_Int16 controlId = args.takeFirst().value<sal_Int16>();
+            sal_Int16 nControlAction = args.takeFirst().value<sal_Int16>();
+            sendIpcArgs(std::cout, messageId, m_filePicker->getValue(controlId, nControlAction));
+            return true;
+        }
+        case Commands::EnableControl:
+        {
+            sal_Int16 controlId = args.takeFirst().value<sal_Int16>();
+            bool enabled = args.takeFirst().toBool();
+            m_filePicker->enableControl(controlId, enabled);
+            return true;
+        }
+        case Commands::SetLabel:
+        {
+            sal_Int16 controlId = args.takeFirst().value<sal_Int16>();
+            QString label = args.takeFirst().toString();
+            m_filePicker->setLabel(controlId, label);
+            return true;
+        }
+        case Commands::GetLabel:
+        {
+            sal_Int16 controlId = args.takeFirst().value<sal_Int16>();
+            sendIpcArgs(std::cout, messageId, m_filePicker->getLabel(controlId));
+            return true;
+        }
+        case Commands::AddCheckBox:
+        {
+            sal_Int16 controlId = args.takeFirst().value<sal_Int16>();
+            bool hidden = args.takeFirst().toBool();
+            QString label = args.takeFirst().toString();
+            m_filePicker->addCheckBox(controlId, label, hidden);
+            return true;
+        }
+        case Commands::Initialize:
+        {
+            bool saveDialog = args.takeFirst().toBool();
+            m_filePicker->initialize(saveDialog);
+            return true;
+        }
+        case Commands::EnablePickFolderMode:
+        {
+            m_filePicker->enableFolderMode();
+            return true;
+        }
+        case Commands::Quit:
+        {
+            QCoreApplication::quit();
+            return false;
+        }
+    }
+    qWarning() << "unhandled command " << static_cast<uint16_t>(command);
+    QCoreApplication::exit(1);
+    return false;
+}
+
+#include <kde5_filepicker_ipc.moc>
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/kde5_filepicker_ipc.hxx b/vcl/unx/gtk3_kde5/kde5_filepicker_ipc.hxx
new file mode 100644
index 000000000..fa9be696c
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/kde5_filepicker_ipc.hxx
@@ -0,0 +1,51 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <memory>
+#include <thread>
+
+#include <QObject>
+
+#include "filepicker_ipc_commands.hxx"
+
+class KDE5FilePicker;
+class WinIdEmbedder;
+class QSocketNotifier;
+
+class FilePickerIpc : public QObject
+{
+    Q_OBJECT
+public:
+    explicit FilePickerIpc(KDE5FilePicker* filePicker, QObject* parent = nullptr);
+    ~FilePickerIpc() override;
+
+private:
+    KDE5FilePicker* m_filePicker = nullptr;
+    std::unique_ptr<std::thread> m_ipcReaderThread;
+
+private Q_SLOTS:
+    bool handleCommand(uint64_t messageId, Commands command, QList<QVariant> args);
+
+Q_SIGNALS:
+    bool commandReceived(uint64_t messageId, Commands command, QList<QVariant> args);
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk3_kde5/kde5_lo_filepicker_main.cxx b/vcl/unx/gtk3_kde5/kde5_lo_filepicker_main.cxx
new file mode 100644
index 000000000..4e73e9ee4
--- /dev/null
+++ b/vcl/unx/gtk3_kde5/kde5_lo_filepicker_main.cxx
@@ -0,0 +1,53 @@
+/* -*- 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 "kde5_filepicker.hxx"
+#include "kde5_filepicker_ipc.hxx"
+
+#include <QApplication>
+#include <QCommandLineParser>
+
+#include <config_version.h>
+
+int main(int argc, char** argv)
+{
+    QApplication::setOrganizationName("LibreOffice");
+    QApplication::setOrganizationDomain("libreoffice.org");
+    QApplication::setApplicationName(QStringLiteral("lo_kde5filepicker"));
+    QApplication::setQuitOnLastWindowClosed(false);
+    QApplication::setApplicationVersion(LIBO_VERSION_DOTTED);
+
+    QApplication app(argc, argv);
+
+    QCommandLineParser parser;
+    parser.setApplicationDescription(
+        QObject::tr("Helper executable for LibreOffice KDE/Plasma integration.\n"
+                    "Do not run this executable directly. Rather, use it indirectly via "
+                    "the gtk3_kde5 VCL plugin (SAL_USE_VCLPLUGIN=gtk3_kde5)."));
+    parser.addVersionOption();
+    parser.addHelpOption();
+    parser.process(app);
+
+    KDE5FilePicker filePicker;
+    FilePickerIpc ipc(&filePicker);
+
+    return QApplication::exec();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */