refs #412 System Tray Window base class

It inherits from QMainWindow automatically acts as SystemTrayWindow.
If minimized it will not quit, but minimize to tray only.

src/blackgui/systemtraywindow.h

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+/* Copyright (C) 2014
+ * 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_ENABLEFORSYSTEMTRAY_H
+#define BLACKGUI_ENABLEFORSYSTEMTRAY_H
+
+#include "blackgui/blackguiexport.h"
+#include <QMainWindow>
+#include <QSystemTrayIcon>
+#include <QMenu>
+#include <QAction>
+
+namespace BlackGui
+{
+
+    //! QDialog which can minimize to system tray
+    class BLACKGUI_EXPORT CSystemTrayWindow : public QMainWindow
+    {
+    public:
+        //! System Tray Flag
+        enum SystemTrayFlag
+        {
+            MinimizeToTray = 0x0,
+            QuitOnClose = 0x1,
+            AskOnClose = 0x2
+        };
+        Q_DECLARE_FLAGS(SystemTrayMode, SystemTrayFlag)
+
+        //! Constructor
+        CSystemTrayWindow(const QIcon &icon, QWidget *parent = nullptr);
+
+        //! System tray mode
+        void setSystemTrayMode(SystemTrayMode mode);
+
+        //! Set icon
+        void setSystemTrayIcon(const QIcon &icon);
+
+        //! Set tool tip
+        void setSystemTrayToolTip(const QString &tooltip);
+
+    protected slots:
+
+        //! Activate window from system tray
+        void ps_activateWindow(QSystemTrayIcon::ActivationReason reason);
+
+        //! Show message in the system tray
+        void ps_showMessage(const QString &title, const QString &message,
+                            QSystemTrayIcon::MessageIcon icon = QSystemTrayIcon::Information,
+                            int millisecondsTimeoutHint = 10000);
+
+    protected:
+
+        //! \copydoc QMainWindow::changeEvent
+        virtual void changeEvent(QEvent *event) override;
+
+        //! \copydoc QMainWindow::closeEvent
+        virtual void closeEvent(QCloseEvent *event) override;
+
+    private:
+
+        void createActions();
+        void createTrayIcon(const QIcon &icon);
+
+        SystemTrayMode m_systemTrayMode = SystemTrayMode { MinimizeToTray | QuitOnClose }; //!< Minimize mode, \sa MinimizeMode
+
+        // System Tray actions
+        QAction *m_actionRestore = nullptr;
+        QAction *m_actionQuit = nullptr;
+        QSystemTrayIcon *m_systemTrayIcon = nullptr;
+        QMenu *m_trayIconMenu = nullptr;
+    };
+
+} // namespace
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(BlackGui::CSystemTrayWindow::SystemTrayMode)
+
+#endif // guard