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diff --git a/src/Authoring/Qt3DStudio/Application/DurationEditDlg.h b/src/Authoring/Qt3DStudio/Application/DurationEditDlg.h
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+++ b/src/Authoring/Qt3DStudio/Application/DurationEditDlg.h
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+/****************************************************************************
+**
+** Copyright (C) 2002 NVIDIA Corporation.
+** Copyright (C) 2018 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef DURATION_EDIT_DIALOG_H
+#define DURATION_EDIT_DIALOG_H
+
+#include <QtWidgets/qdialog.h>
+
+class IDoc;
+
+class ITimeChangeCallback
+{
+public:
+    virtual ~ITimeChangeCallback() {}
+    virtual void ChangeStartTime(long) = 0;
+    virtual void ChangeEndTime(long) = 0;
+    virtual void Commit() = 0;
+    virtual void Rollback() = 0;
+};
+
+#ifdef QT_NAMESPACE
+using namespace QT_NAMESPACE;
+#endif
+
+QT_BEGIN_NAMESPACE
+namespace Ui {
+class DurationEditDlg;
+}
+QT_END_NAMESPACE
+
+class CDurationEditDlg : public QDialog
+{
+    Q_OBJECT
+
+public:
+    CDurationEditDlg(QWidget *parent = nullptr);
+    ~CDurationEditDlg() override;
+
+    void showDialog(long startTime, long endTime, ITimeChangeCallback *inCallback = nullptr);
+
+public Q_SLOTS:
+    void accept() override;
+    void reject() override;
+
+private:
+    void onStartTimeChanged();
+    void onEndTimeChanged();
+
+    void formatTime(long inTime, bool startTime);
+    void updateObjectTime(long inTime, bool startTime);
+
+    Ui::DurationEditDlg *m_ui;
+    ITimeChangeCallback *m_Callback = nullptr;
+};
+#endif // DURATION_EDIT_DIALOG_H