Starting client activates existing instance if such exists

src/main.cpp

@@ -110,6 +110,7 @@ int main(int argc, char *argv[])
     IPC ipc;
     ipc.registerEventHandler(&toxURIEventHandler);
     ipc.registerEventHandler(&toxSaveEventHandler);
+    ipc.registerEventHandler(&toxActivateEventHandler);
 
     if (parser.positionalArguments().size() > 0)
     {
@@ -152,6 +153,13 @@ int main(int argc, char *argv[])
             return EXIT_FAILURE;
         }
     }
+    else if(!ipc.isCurrentOwner())
+    {
+        time_t event = ipc.postEvent("$activate");
+        ipc.waitUntilProcessed(event);
+        if (!ipc.isCurrentOwner())
+            return EXIT_SUCCESS;
+    }
 
     // Run
     Widget* w = Widget::getInstance();

src/widget/widget.cpp

@@ -51,6 +51,14 @@
 #include <QTranslator>
 #include <tox/tox.h>
 
+void toxActivateEventHandler(const QByteArray& data)
+{
+    if(data != "$activate")
+        return;
+    Widget::getInstance()->show();
+    Widget::getInstance()->activateWindow();
+}
+
 Widget *Widget::instance{nullptr};
 
 Widget::Widget(QWidget *parent)
@@ -563,7 +571,10 @@ void Widget::onIconClick(QSystemTrayIcon::ActivationReason reason)
     switch (reason) {
         case QSystemTrayIcon::Trigger:
         if(this->isHidden() == true)
+        {
             this->show();
+            this->activateWindow();
+        }
         else
             this->hide();
         case QSystemTrayIcon::DoubleClick:    

src/widget/widget.h

@@ -168,4 +168,6 @@ private:
     QTranslator* translator;
 };
 
+void toxActivateEventHandler(const QByteArray& data);
+
 #endif // WIDGET_H