refs #901, utility class for single UI widgets

(disables widget when >1 swift application runs)

src/blackgui/singleapplicationui.h

@@ -0,0 +1,42 @@
+/* Copyright (C) 2017
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKGUI_SINGLEAPPLICATIONUI_H
+#define BLACKGUI_SINGLEAPPLICATIONUI_H
+
+#include <QTimer>
+
+class QWidget;
+
+namespace BlackGui
+{
+    /**
+     * Enable / disable UI depending on how many swift applications are running
+     */
+    class CSingleApplicationUi
+    {
+    public:
+        //! Constructor
+        CSingleApplicationUi(QWidget *ui);
+
+        //! Set UI widget
+        void setWidget(QWidget *ui) { m_ui = ui; }
+
+    private:
+        //! Evaluate if
+        void evaluate();
+
+        QTimer m_timer;
+        QWidget *m_ui = nullptr; //!< enabled/disabled UI
+    };
+} // ns
+
+#endif // guard