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diff --git a/src/Authoring/Qt3DStudio/DragAndDrop/DropSource.h b/src/Authoring/Qt3DStudio/DragAndDrop/DropSource.h
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+++ b/src/Authoring/Qt3DStudio/DragAndDrop/DropSource.h
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+/****************************************************************************
+**
+** Copyright (C) 1999-2003 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//==============================================================================
+//	Includes
+//==============================================================================
+#ifndef INCLUDED_DROPSOURCE
+#define INCLUDED_DROPSOURCE
+
+#include "Qt3DSDMHandles.h"
+#include "Pt.h"
+#include "Cmd.h"
+#include <QMimeData>
+
+typedef enum _EDROPDESTINATION {
+    EDROPDESTINATION_ON, ///< drop occurs on the target asset
+    EDROPDESTINATION_ABOVE, ///< drop occurs above the target asset
+    EDROPDESTINATION_BELOW ///< drop occurs below the target asset
+} EDROPDESTINATION;
+
+class CDropTarget;
+class IDragable;
+class CStudioApp;
+
+class CDropSource : public QMimeData
+{
+protected:
+    long m_Flavor;
+    unsigned long m_Size;
+
+    qt3dsdm::TInstanceHandleList m_Instances;
+    long m_ObjectType = 0;
+    int m_FileType = 0;
+    bool m_HasValidTarget = false;
+    CPt m_CurrentPoint;
+    Qt::KeyboardModifiers m_CurrentFlags = 0;
+
+public:
+    CDropSource(long inFlavor, unsigned long inSize = 0);
+    virtual ~CDropSource();
+
+    virtual bool CanMove() = 0;
+    virtual bool CanCopy() = 0;
+    long GetObjectType() const { return m_ObjectType; }
+    long getFileType() const { return m_FileType; }
+    long GetFlavor()  const { return m_Flavor; }
+    virtual bool ValidateTarget(CDropTarget *) = 0;
+
+    virtual bool GetHasValidTarget() const { return m_HasValidTarget; }
+    virtual void SetHasValidTarget(bool inValid) { m_HasValidTarget = inValid; }
+    virtual void InterpretKeyFlags(long) {}
+
+    virtual void SetCurrentPoint(CPt &inPoint) { m_CurrentPoint = inPoint; }
+    virtual CPt GetCurrentPoint() const { return m_CurrentPoint; }
+
+    virtual void SetCurrentFlags(Qt::KeyboardModifiers inFlags) { m_CurrentFlags = inFlags; }
+    virtual Qt::KeyboardModifiers GetCurrentFlags() const { return m_CurrentFlags; }
+
+    virtual CCmd *GenerateAssetCommand(qt3dsdm::Qt3DSDMInstanceHandle, EDROPDESTINATION,
+                                       qt3dsdm::Qt3DSDMSlideHandle)
+    {
+        return nullptr;
+    }
+    virtual CCmd *GenerateSlideCommand(long) { return nullptr; }
+};
+
+class CDropSourceFactory
+{
+public:
+    static CDropSource *Create(long inFlavor, IDragable *inDragable);
+    static CDropSource *Create(long inFlavor, const QString &filePath);
+};
+
+#endif