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diff --git a/src/Runtime/Source/event/EventPollingSystem.h b/src/Runtime/Source/event/EventPollingSystem.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef EVENT_SYSTEM_H
+#define EVENT_SYSTEM_H
+
+#include "foundation/Qt3DSFoundation.h"
+#include "foundation/Qt3DSRefCounted.h"
+#include "EventSystem.h"
+
+namespace qt3ds {
+namespace evt {
+
+    class CEventProviderRefCounted;
+
+    class IEventSystem : public qt3ds::foundation::NVRefCounted
+    {
+    protected:
+        virtual ~IEventSystem() {}
+    public:
+        // Providers once added are released if the poller goes out of scope.
+        // Adding the same provider twice has no effect.
+        virtual void AddProvider(IEventProvider &inProvider) = 0;
+
+        // removeProvider does not release the provider; callers are expected to release the
+        // provider themselves after calling remove provider.  Calling remove provider
+        // with a provider that isn't in the system has no effect.
+        virtual void RemoveProvider(IEventProvider &inProvider) = 0;
+
+        // Ignore events from this provider.  Returns true if provider is added.
+        virtual bool IgnoreProvider(IEventProvider &inProvider) = 0;
+
+        // Listen on this provider.  Returns true if provider is added.
+        virtual bool ActivateProvider(IEventProvider &inProvider) = 0;
+
+        // Get a set of events from the poller.  The poller will simply run through and ask each
+        // provider
+        // for events and then begin returning the set of events.
+        // Note: this interface needs to set the event fetched flag.
+        virtual size_t GetNextEvents(Qt3DSEventSystemEvent **outBuffer, size_t bufLen) = 0;
+
+        // Get the event factory used for this poller.
+        virtual IEventFactory &GetEventFactory() = 0;
+
+        virtual Qt3DSEventSystemEventPoller *GetCInterface() = 0;
+
+        // Get and clear the flag indicates whether GetNextEvents has been called after last call of
+        // this interface
+        // Note: the event fetched flag is set by GetNextEvents
+        virtual bool GetAndClearEventFetchedFlag() = 0;
+
+        // Clear events in event system and events in all providers
+        virtual void PurgeEvents() = 0;
+
+        static IEventSystem &Create(qt3ds::NVFoundationBase &inFoundation);
+    };
+}
+}
+
+#endif // EVENT_SYSTEM_H