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diff --git a/src/api/studio3d/q3dspresentation_p.h b/src/api/studio3d/q3dspresentation_p.h
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+/****************************************************************************
+**
+** 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 Q3DSPRESENTATION_P_H
+#define Q3DSPRESENTATION_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QtStudio3D API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "q3dspresentation.h"
+#include "q3dscommandqueue_p.h"
+#include "Qt3DSViewerApp.h"
+#include <QtCore/QHash>
+#include <QtCore/QUrl>
+
+QT_BEGIN_NAMESPACE
+
+class CommandQueue;
+class ViewerQmlStreamProxy;
+class QKeyEvent;
+
+class Q_STUDIO3D_EXPORT Q3DSPresentationPrivate : public QObject
+{
+    Q_OBJECT
+    Q_DECLARE_PUBLIC(Q3DSPresentation)
+
+public:
+    typedef QHash<QString, Q3DSElement *> ElementMap;
+    typedef QHash<QString, Q3DSDataInput *> DataInputMap;
+    typedef QHash<QString, Q3DSDataOutput *> DataOutputMap;
+
+    explicit Q3DSPresentationPrivate(Q3DSPresentation *parent);
+    ~Q3DSPresentationPrivate();
+
+    void setSource(const QUrl &source);
+    void setVariantList(const QStringList &variantList);
+    void setViewerApp(Q3DSViewer::Q3DSViewerApp *app, bool connectApp = true);
+    void setCommandQueue(CommandQueue *queue);
+    void setDelayedLoading(bool enable);
+
+    void registerElement(Q3DSElement *element);
+    void unregisterElement(Q3DSElement *element);
+    void unregisterAllElements();
+
+    void registerDataInput(Q3DSDataInput *dataInput);
+    void unregisterDataInput(Q3DSDataInput *dataInput);
+    void unregisterAllDataInputs();
+    void registerDataOutput(Q3DSDataOutput *dataOutput);
+    void unregisterDataOutput(Q3DSDataOutput *dataOutput);
+    void unregisterAllDataOutputs();
+
+    bool isValidDataInput(const Q3DSDataInput *dataInput) const;
+    float dataInputMin(const QString &name) const;
+    float dataInputMax(const QString &name) const;
+    QHash<QString, QString> dataInputMetadata(const QString &name) const;
+    QVector<Q3DSDataInput *> dataInputs(const QString &key) const;
+    bool isValidDataOutput(const Q3DSDataOutput *dataOutput) const;
+
+    ViewerQmlStreamProxy *streamProxy();
+    Q3DStudio::EKeyCode getScanCode(QKeyEvent *e);
+
+    void requestResponseHandler(CommandType commandType, void *requestData);
+
+public Q_SLOTS:
+    void handleSlideEntered(const QString &elementPath, unsigned int index, const QString &name);
+    void handleDataOutputValueUpdate(const QString &name, const QVariant &newValue);
+    void handleElementsCreated(const QStringList &elementPaths, const QString &error);
+    void handleMaterialsCreated(const QStringList &materialNames, const QString &error);
+    void handleMeshesCreated(const QStringList &meshNames, const QString &error);
+
+public:
+    Q3DSPresentation *q_ptr;
+
+private:
+    Q3DSViewer::Q3DSViewerApp *m_viewerApp; // Not owned
+    CommandQueue *m_commandQueue; // Not owned
+    ElementMap m_elements;
+    DataInputMap m_dataInputs;
+    DataOutputMap m_dataOutputs;
+    QUrl m_source;
+    QStringList m_variantList;
+    ViewerQmlStreamProxy *m_streamProxy;
+    bool m_delayedLoading;
+    QStringList m_createdElements;
+    QStringList m_createdMaterials;
+    QStringList m_createdMeshes;
+
+    friend class Q3DSStudio3D;
+};
+
+QT_END_NAMESPACE
+
+#endif // Q3DSPRESENTATION_P_H