refs #466 Refactored automatic signal relaying into CGenericDBusInterface.

src/blackmisc/genericdbusinterface.h

@@ -1,3 +1,14 @@
+/* Copyright (C) 2013
+ * 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 BLACKMISC_GENERICDBUSINTERFACE_H
 #define BLACKMISC_GENERICDBUSINTERFACE_H
 
@@ -5,6 +16,15 @@
 #include <QDBusPendingCall>
 #include <QDBusPendingReply>
 #include <QObject>
+#include <QMetaMethod>
+
+#ifndef Q_MOC_RUN
+/*!
+ * Any signals tagged with this macro will be ignored by BlackMisc::CGenericDBusInterface::relayParentSignals().
+ * \see QMetaMethod::tag
+ */
+#define BLACK_NO_RELAY
+#endif
 
 namespace BlackMisc
 {
@@ -23,6 +43,25 @@ namespace BlackMisc
             QDBusAbstractInterface(serviceName, path, interfaceName.toUtf8().constData(), connection, parent)
         {  }
 
+        //! For each signal in parent, attempt to connect to it an interface signal of the same name.
+        //! \see BLACK_NO_RELAY
+        void relayParentSignals()
+        {
+            const QMetaObject *metaObject = this->parent()->metaObject();
+            const QMetaObject *superMetaObject = metaObject;
+            while (strcmp(superMetaObject->superClass()->className(), "QObject") != 0) { superMetaObject = superMetaObject->superClass(); }
+
+            for (int i = superMetaObject->methodOffset(), count = metaObject->methodCount(); i < count; ++i)
+            {
+                QMetaMethod method = metaObject->method(i);
+                if (method.methodType() != QMetaMethod::Signal) { continue; }
+                if (method.tag() && strcmp(method.tag(), "BLACK_NO_RELAY") == 0) { continue; }
+
+                this->connection().connect(this->service(), this->path(), this->interface(), method.name(), this->parent(),
+                    method.methodSignature().prepend("2")); // the reason for this "2" can be found in the definition of SIGNAL() macro
+            }
+        }
+
         //! Call DBus, no return value
         template <typename... Args>
         void callDBus(const QLatin1String &method, Args&&... args)