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diff --git a/src/Authoring/Studio/Palettes/Timeline/TimelineTimelineLayout.h b/src/Authoring/Studio/Palettes/Timeline/TimelineTimelineLayout.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_TIMELINE_TIMELINE_LAYOUT_H
+#define INCLUDED_TIMELINE_TIMELINE_LAYOUT_H 1
+
+#pragma once
+
+//=============================================================================
+// Includes
+//=============================================================================
+#include "Control.h"
+#include <vector>
+#include "ScalableScrollerBar.h"
+#include "Scroller.h"
+#include "Pt.h"
+#include "Snapper.h"
+#include "AreaBoundingRect.h"
+#include "Playhead.h"
+#include "UICDMHandles.h"
+
+//=============================================================================
+// Forwards
+//=============================================================================
+class CScalableScroller;
+class CTimelineRow;
+class CFlowLayout;
+class CTimelineControl;
+class CSnapper;
+class IDoc;
+class CHotKeys;
+class CTimeMeasure;
+class CPlayhead;
+
+//=============================================================================
+/**
+ * Right-hand pane of the Timeline containing timebars, keyframes, etc.
+ */
+class CTimelineTimelineLayout : public CControl,
+                                public CScalingListener,
+                                public CScrollListener,
+                                public ISnappingListProvider
+{
+    typedef std::vector<CTimelineRow *> TTimelineRowList;
+    typedef std::map<UICDM::CUICDMSlideHandle, double> TSlideRatioMap;
+
+public:
+    static const long END_BUFFER_SIZE = 20;
+    static const double SCALING_PERCENTAGE_INC;
+    static const double SCALING_PERCENTAGE_DEC;
+    static const double MAX_ZOOM_OUT;
+
+    CTimelineTimelineLayout(CTimelineControl *inView, IDoc *inDoc);
+    virtual ~CTimelineTimelineLayout();
+
+    void SetSize(CPt inSize) override;
+
+    void AddRow(CTimelineRow *inRow);
+
+    void OnScalingRight(long inLength, long inTotalLength, long inOffset) override;
+    void OnScalingLeft(long inLength, long inTotalLength, long inOffset) override;
+    void OnScalingReset() override;
+
+    long ScrollLayout(long inAmount);
+
+    void Filter();
+
+    void OnScroll(CScroller *inScroller, CPt inScrollAmount) override;
+    void SetScrollPositionY(CScroller *inSource, long inPositionY, bool inAbsolute = true);
+
+    void ClearRows();
+
+    bool OnMouseDown(CPt inPoint, Qt::KeyboardModifiers inFlags) override;
+    void OnMouseMove(CPt inPoint, Qt::KeyboardModifiers inFlags) override;
+    void OnMouseUp(CPt inPoint, Qt::KeyboardModifiers inFlags) override;
+    bool OnMouseWheel(CPt inPoint, long inAmount, Qt::KeyboardModifiers inFlags) override;
+
+    CScalableScroller *GetScroller();
+    CPlayhead *GetPlayhead();
+    CTimeMeasure *GetTimeMeasure();
+    void RecalcTime(bool inUpdateClient, long inFlags);
+    void SetTime(long inTime, bool inIsSecondary = false);
+    void OnTimeMeasureMouseDown(CPt inPoint, Qt::KeyboardModifiers inFlags);
+    long GetViewTimeOffset();
+    void RecalcLayout();
+    void RegisterGlobalKeyboardShortcuts(CHotKeys *inShortcutHandler);
+    void SetTimeRatio(double inTimeRatio);
+    void OnTimelineLayoutChanged();
+
+    void DeleteTimelineRatio(UICDM::CUICDMSlideHandle inSlide);
+    void ClearAllTimeRatios();
+    double GetTimelineRatio(UICDM::CUICDMSlideHandle inSlide);
+
+    // ISnappingListProvider
+    void PopulateSnappingList(CSnapper *inSnappingList) override;
+
+protected:
+    void SetTimelineRatio(UICDM::CUICDMSlideHandle inSlide, double inRatio);
+
+    long GetMaximumTimebarTime();
+    void OnScalingZoomIn();
+    void OnScalingZoomOut();
+    void CenterToPlayhead();
+
+    bool m_CommitKeyframeSelection; ///< flag for saving previous keyframe selection when the mouse
+                                    ///is released.
+    CTimelineControl *m_TimelineControl;
+    CTimeMeasure *m_TimeMeasure;
+    CScalableScroller *m_Scroller;
+    CFlowLayout *m_TimebarList;
+    double m_TimeRatio;
+
+    TTimelineRowList m_Rows;
+    CPlayhead m_Playhead;
+    CSnapper m_Snapper;
+    bool m_IsLayoutChanged; ///< flag to keep track of a need for a delayed RecalcLayout
+
+    bool m_IsMouseDown;
+    CPt m_DragBeginPoint;
+    CAreaBoundingRect *m_BoundingRect;
+
+    TSlideRatioMap m_TimelineRatio; ///< stores the time zooming ratios for each slide
+};
+#endif // INCLUDED_TIMELINE_TIMELINE_LAYOUT_H