added actor_widget_mixin for Qt support

this mixin enables libcppa users to use message passing to communicate
to Qt widgets

cppa.files

@@ -295,3 +295,4 @@ src/response_handle.cpp
 cppa/wildcard_position.hpp
 cppa/network/message_header.hpp
 src/message_header.cpp
+cppa/qtsupport/actor_widget_mixin.hpp

cppa/qtsupport/actor_widget_mixin.hpp

@@ -0,0 +1,80 @@
+/******************************************************************************\
+ *           ___        __                                                    *
+ *          /\_ \    __/\ \                                                   *
+ *          \//\ \  /\_\ \ \____    ___   _____   _____      __               *
+ *            \ \ \ \/\ \ \ '__`\  /'___\/\ '__`\/\ '__`\  /'__`\             *
+ *             \_\ \_\ \ \ \ \L\ \/\ \__/\ \ \L\ \ \ \L\ \/\ \L\.\_           *
+ *             /\____\\ \_\ \_,__/\ \____\\ \ ,__/\ \ ,__/\ \__/.\_\          *
+ *             \/____/ \/_/\/___/  \/____/ \ \ \/  \ \ \/  \/__/\/_/          *
+ *                                          \ \_\   \ \_\                     *
+ *                                           \/_/    \/_/                     *
+ *                                                                            *
+ * Copyright (C) 2011, 2012                                                   *
+ * Dominik Charousset <dominik.charousset@haw-hamburg.de>                     *
+ *                                                                            *
+ * This file is part of libcppa.                                              *
+ * libcppa is free software: you can redistribute it and/or modify it under   *
+ * the terms of the GNU Lesser General Public License as published by the     *
+ * Free Software Foundation, either version 3 of the License                  *
+ * or (at your option) any later version.                                     *
+ *                                                                            *
+ * libcppa is distributed in the hope that it will be useful,                 *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                       *
+ * See the GNU Lesser General Public License for more details.                *
+ *                                                                            *
+ * You should have received a copy of the GNU Lesser General Public License   *
+ * along with libcppa. If not, see <http://www.gnu.org/licenses/>.            *
+\******************************************************************************/
+
+
+#ifndef CPPA_ACTOR_WIDGET_MIXIN_HPP
+#define CPPA_ACTOR_WIDGET_MIXIN_HPP
+
+#include <QEvent>
+#include <QApplication>
+
+#include "cppa/actor_companion_mixin.hpp"
+
+namespace cppa {
+
+template<typename Base, int EventId = static_cast<int>(QEvent::User + 31337)>
+class actor_widget_mixin : public actor_companion_mixin<Base> {
+
+    typedef actor_companion_mixin<Base> super;
+
+    typedef typename super::message_pointer message_pointer;
+
+ public:
+
+    struct event_type : public QEvent {
+
+        message_pointer msg;
+
+        event_type(message_pointer mptr)
+        : QEvent(static_cast<QEvent::Type>(EventId)), msg(std::move(mptr)) { }
+
+    };
+
+    virtual bool event(QEvent* event) {
+        if (event->type() == static_cast<QEvent::Type>(EventId)) {
+            auto ptr = dynamic_cast<event_type*>(event);
+            if (ptr) {
+                this->handle_message(ptr->msg);
+                return true;
+            }
+        }
+        return super::event(event);
+    }
+
+ protected:
+
+    virtual void new_message(message_pointer ptr) {
+        qApp->postEvent(this, new event_type(std::move(ptr)));
+    }
+
+};
+
+} // namespace cppa
+
+#endif // CPPA_ACTOR_WIDGET_MIXIN_HPP