Added option to disable/enable tray icon explicitly + some details.

src/gui/formmain.cpp

@@ -46,6 +46,13 @@ void FormMain::quit() {
   qApp->quit();
 }
 
+void FormMain::display() {
+  setWindowState(windowState() & ~Qt::WindowMinimized);
+  raise();
+  activateWindow();
+  QtSingleApplication::alert(this);
+}
+
 void FormMain::cleanupResources() {
   qDebug("Cleaning up resources before the application exits.");
 }

src/gui/formmain.h

@@ -28,6 +28,7 @@ class FormMain : public QMainWindow {
   public slots:
     void processExecutionMessage(const QString &message);
     void quit();
+    void display();
 
   protected slots:
     void cleanupResources();

src/gui/formsettings.cpp

@@ -92,6 +92,12 @@ void FormSettings::saveInterface() {
     // TODO: Switch tray icon here (destroy it/create it) and
     // if icon is should be destroyed and no main window is visible,
     // then show main window and then destroy tray icon.
+    if (Settings::getInstance()->value(APP_CFG_GUI, "use_tray_icon", true).toBool()) {
+      SystemTrayIcon::getInstance()->show();
+    }
+    else {
+      SystemTrayIcon::deleteInstance();
+    }
   }
 
   // Save selected icon theme.

src/gui/systemtrayicon.cpp

@@ -7,11 +7,11 @@
 #include "core/defs.h"
 
 
-QPointer<SystemTrayIcon> SystemTrayIcon::m_trayIcon;
+QPointer<SystemTrayIcon> SystemTrayIcon::s_trayIcon;
 
 SystemTrayIcon::SystemTrayIcon(const QString &normal_icon,
                                const QString &plain_icon,
-                               QObject *parent)
+                               FormMain *parent)
   : QSystemTrayIcon(parent), m_normalIcon(normal_icon), m_plainIcon(plain_icon) {
   qDebug("Creating SystemTrayIcon instance.");
 
@@ -35,13 +35,21 @@ bool SystemTrayIcon::isSystemTrayActivated() {
 }
 
 SystemTrayIcon *SystemTrayIcon::getInstance() {
-  if (m_trayIcon.isNull()) {
+  if (s_trayIcon.isNull()) {
-    m_trayIcon = new SystemTrayIcon(APP_ICON_PATH,
+    s_trayIcon = new SystemTrayIcon(APP_ICON_PATH,
                                     APP_ICON_PLAIN_PATH,
                                     FormMain::getInstance());
   }
 
-  return m_trayIcon;
+  return s_trayIcon;
+}
+
+void SystemTrayIcon::deleteInstance() {
+  if (!s_trayIcon.isNull()) {
+    qDebug("Disabling tray icon and raising main application window.");
+    static_cast<FormMain*>((*s_trayIcon).parent())->display();
+    delete s_trayIcon.data();
+  }
 }
 
 void SystemTrayIcon::show_private() {

src/gui/systemtrayicon.h

@@ -5,12 +5,14 @@
 #include <QPointer>
 
 
+class FormMain;
+
 class SystemTrayIcon : public QSystemTrayIcon {
     Q_OBJECT
   public:
     explicit SystemTrayIcon(const QString &normal_icon,
                             const QString &plain_icon,
-                            QObject *parent = 0);
+                            FormMain *parent = 0);
     ~SystemTrayIcon();
 
     // Returns true if tray icon CAN be constructed on this machine.
@@ -29,6 +31,7 @@ class SystemTrayIcon : public QSystemTrayIcon {
 
     // TODO: Implement method for manual clearing of the tray icon. Creating of tray icon
     // handled by getInstance().
+    static void deleteInstance();
   signals:
     
   public slots:
@@ -41,7 +44,7 @@ class SystemTrayIcon : public QSystemTrayIcon {
     QString m_normalIcon;
     QString m_plainIcon;
 
-    static QPointer<SystemTrayIcon> m_trayIcon;
+    static QPointer<SystemTrayIcon> s_trayIcon;
 };
 
 #endif // SYSTEMTRAYICON_H