Refactoring Cmake

cleaning up the Cmake code

cmake/fetch_singleapplication.cmake

@@ -0,0 +1,31 @@
+# Copyright 2006 The QElectroTech Team
+# This file is part of QElectroTech.
+#
+# QElectroTech is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# QElectroTech is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
+
+message(" - fetch_singleapplication")
+
+# https://github.com/itay-grudev/SingleApplication/issues/18
+#qmake
+#DEFINES += QAPPLICATION_CLASS=QGuiApplication
+set(QAPPLICATION_CLASS QApplication)
+
+Include(FetchContent)
+
+FetchContent_Declare(
+  SingleApplication
+  GIT_REPOSITORY https://github.com/itay-grudev/SingleApplication.git
+  GIT_TAG        v3.1.5)
+
+FetchContent_MakeAvailable(SingleApplication)