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diff --git a/src/Authoring/Qt3DStudio/DragAndDrop/DropProxy.h b/src/Authoring/Qt3DStudio/DragAndDrop/DropProxy.h
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+/****************************************************************************
+**
+** Copyright (C) 2002 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//==============================================================================
+//	Prefix
+//==============================================================================
+#ifndef INCLUDED_DROP_PROXY
+#define INCLUDED_DROP_PROXY 1
+
+#pragma once
+
+//==============================================================================
+//	Includes
+//==============================================================================
+#include <QObject>
+
+//==============================================================================
+//	Forwards
+//==============================================================================
+
+class CDropContainer;
+class CStudioApp;
+class CDropSource;
+
+QT_FORWARD_DECLARE_CLASS(QDragEnterEvent)
+QT_FORWARD_DECLARE_CLASS(QDragLeaveEvent)
+QT_FORWARD_DECLARE_CLASS(QDragMoveEvent)
+QT_FORWARD_DECLARE_CLASS(QDropEvent)
+QT_FORWARD_DECLARE_CLASS(QMimeData)
+
+class CDropProxy : public QObject
+{
+    Q_OBJECT
+public:
+    CDropProxy(CDropContainer *inParent);
+    virtual ~CDropProxy();
+
+    void dragEnterEvent(QDragEnterEvent *event);
+    void dragLeaveEvent(QDragLeaveEvent *event);
+    void dragMoveEvent(QDragMoveEvent *event);
+    void dropEvent(QDropEvent *event);
+
+    CDropSource *GetDropSource(const QMimeData *inDataObject, long inFlavor, long inItem);
+    long GetDragItemCount(const QMimeData *inDataObject);
+    bool HasMainFlavor(const QMimeData *inDataObject, long inFlavor);
+    Qt::KeyboardModifiers ReflectMouse(long inX, long inY);
+
+    void Register(QWidget* widget);
+
+    bool eventFilter(QObject *watched, QEvent *event) override;
+
+protected:
+    CDropContainer *m_Parent;
+};
+
+#endif // INCLUDED_DROP_PROXY