1 files changed, 48 insertions, 0 deletions
diff --git a/vcl/qt5/QtX11Support.cxx b/vcl/qt5/QtX11Support.cxx
new file mode 100644
index 0000000000..84036fb8a5
--- /dev/null
+++ b/vcl/qt5/QtX11Support.cxx
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <QtX11Support.hxx>
+
+#include <config_vclplug.h>
+
+#include <QtCore/QVersionNumber>
+
+#include <QtInstance.hxx>
+#include <QtTools.hxx>
+
+#if CHECK_QT5_USING_X11
+#include <QtX11Extras/QX11Info>
+#endif
+
+#include <unx/gensys.h>
+
+void QtX11Support::setApplicationID(const xcb_window_t nWinId, std::u16string_view rWMClass)
+{
+#if CHECK_QT5_USING_X11
+    OString aResClass = OUStringToOString(rWMClass, RTL_TEXTENCODING_ASCII_US);
+    const char* pResClass
+        = !aResClass.isEmpty() ? aResClass.getStr() : SalGenericSystem::getFrameClassName();
+    OString aResName = SalGenericSystem::getFrameResName();
+
+    // the WM_CLASS data consists of two concatenated cstrings, including the terminating '\0' chars
+    const uint32_t data_len = aResName.getLength() + 1 + strlen(pResClass) + 1;
+    char* data = new char[data_len];
+    memcpy(data, aResName.getStr(), aResName.getLength() + 1);
+    memcpy(data + aResName.getLength() + 1, pResClass, strlen(pResClass) + 1);
+
+    xcb_change_property(QX11Info::connection(), XCB_PROP_MODE_REPLACE, nWinId, XCB_ATOM_WM_CLASS,
+                        XCB_ATOM_STRING, 8, data_len, data);
+    delete[] data;
+#else
+    Q_UNUSED(nWinId);
+    Q_UNUSED(rWMClass);
+#endif
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */