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diff --git a/src/plugins/qmldesigner/components/timelineeditor/timelinegraphicsscene.h b/src/plugins/qmldesigner/components/timelineeditor/timelinegraphicsscene.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** 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.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "timelinetooldelegate.h"
+#include "timelineutils.h"
+
+#include <qmltimeline.h>
+
+#include <QGraphicsScene>
+
+#include <memory>
+
+QT_FORWARD_DECLARE_CLASS(QGraphicsLinearLayout)
+QT_FORWARD_DECLARE_CLASS(QComboBox)
+
+namespace QmlDesigner {
+
+class TimelineView;
+class TimelineWidget;
+class TimelineItem;
+class TimelineRulerSectionItem;
+class TimelineFrameHandle;
+class TimelineAbstractTool;
+class TimelineMoveTool;
+class TimelineKeyframeItem;
+class TimelinePlaceholder;
+class TimelineGraphicsLayout;
+class TimelineToolBar;
+
+class TimelineGraphicsScene : public QGraphicsScene
+{
+    Q_OBJECT
+
+signals:
+    void selectionChanged();
+
+    void scroll(const TimelineUtils::Side &side);
+
+public:
+    explicit TimelineGraphicsScene(TimelineWidget *parent);
+
+    ~TimelineGraphicsScene() override;
+
+    void onShow();
+
+    void setTimeline(const QmlTimeline &timeline);
+    void clearTimeline();
+
+    void setWidth(int width);
+
+    void invalidateLayout();
+    void setCurrenFrame(const QmlTimeline &timeline, qreal frame);
+    void setCurrentFrame(int frame);
+    void setStartFrame(int frame);
+    void setEndFrame(int frame);
+
+    TimelineView *timelineView() const;
+    TimelineWidget *timelineWidget() const;
+    TimelineToolBar *toolBar() const;
+
+    qreal rulerScaling() const;
+    int rulerWidth() const;
+    qreal rulerDuration() const;
+    qreal startFrame() const;
+    qreal endFrame() const;
+
+    qreal mapToScene(qreal x) const;
+    qreal mapFromScene(qreal x) const;
+
+    qreal currentFramePosition() const;
+    QVector<qreal> keyframePositions() const;
+    QVector<qreal> keyframePositions(const QmlTimelineKeyframeGroup &frames) const;
+
+    void setRulerScaling(int scaling);
+
+    void commitCurrentFrame(qreal frame);
+
+    QList<TimelineKeyframeItem *> selectedKeyframes() const;
+
+    bool hasSelection() const;
+    bool isCurrent(TimelineKeyframeItem *keyframe) const;
+    bool isKeyframeSelected(TimelineKeyframeItem *keyframe) const;
+    bool multipleKeyframesSelected() const;
+
+    void invalidateSectionForTarget(const ModelNode &modelNode);
+    void invalidateKeyframesForTarget(const ModelNode &modelNode);
+
+    void invalidateScene();
+    void invalidateScrollbar();
+    void invalidateCurrentValues();
+    void invalidateRecordButtonsStatus();
+
+    int scrollOffset() const;
+    void setScrollOffset(int offset);
+    QGraphicsView *graphicsView() const;
+    QGraphicsView *rulerView() const;
+
+    QmlTimeline currentTimeline() const;
+
+    QRectF selectionBounds() const;
+
+    void selectKeyframes(const SelectionMode &mode, const QList<TimelineKeyframeItem *> &items);
+    void clearSelection();
+
+    void handleKeyframeDeletion();
+    void deleteAllKeyframesForTarget(const ModelNode &targetNode);
+    void insertAllKeyframesForTarget(const ModelNode &targetNode);
+    void copyAllKeyframesForTarget(const ModelNode &targetNode);
+    void pasteKeyframesToTarget(const ModelNode &targetNode);
+
+    void handleKeyframeInsertion(const ModelNode &target, const PropertyName &propertyName);
+
+    void deleteKeyframeGroup(const ModelNode &group);
+    void deleteKeyframes(const QList<ModelNode> &frames);
+
+    void activateLayout();
+
+signals:
+    void statusBarMessageChanged(const QString &message);
+
+protected:
+    bool event(QEvent *event) override;
+    void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
+    void mouseMoveEvent(QGraphicsSceneMouseEvent *event) override;
+    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override;
+    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event) override;
+
+    void keyPressEvent(QKeyEvent *keyEvent) override;
+    void keyReleaseEvent(QKeyEvent *keyEvent) override;
+
+private:
+    void copySelectedKeyframes();
+    void pasteSelectedKeyframes();
+
+    void invalidateSections();
+    ModelNode timelineModelNode() const;
+
+    void emitScrollOffsetChanged();
+    void emitStatusBarFrameMessageChanged(int frame);
+
+    QList<QGraphicsItem *> itemsAt(const QPointF &pos);
+
+private:
+    TimelineWidget *m_parent = nullptr;
+
+    TimelineGraphicsLayout *m_layout = nullptr;
+
+    TimelineFrameHandle *m_currentFrameIndicator = nullptr;
+
+    TimelineToolDelegate m_tools;
+
+    QList<TimelineKeyframeItem *> m_selectedKeyframes;
+
+    int m_scrollOffset = 0;
+};
+
+} // namespace QmlDesigner