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diff --git a/src/plugins/qmldesigner/components/transitioneditor/transitioneditorsectionitem.h b/src/plugins/qmldesigner/components/transitioneditor/transitioneditorsectionitem.h
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+++ b/src/plugins/qmldesigner/components/transitioneditor/transitioneditorsectionitem.h
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+/****************************************************************************
+**
+** Copyright (C) 2020 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 "transitioneditorconstants.h"
+
+#include <timelineeditor/timelineitem.h>
+#include <timelineeditor/timelinemovableabstractitem.h>
+
+#include <modelnode.h>
+#include <qmltimeline.h>
+
+QT_FORWARD_DECLARE_CLASS(QComboBox)
+QT_FORWARD_DECLARE_CLASS(QPainter)
+
+namespace QmlDesigner {
+
+class TransitionEditorSectionItem;
+class TransitionEditorPropertyItem;
+
+class TransitionEditorBarItem : public TimelineMovableAbstractItem
+{
+    Q_DECLARE_TR_FUNCTIONS(TimelineBarItem)
+
+    enum class Location { Undefined, Center, Left, Right };
+
+public:
+    explicit TransitionEditorBarItem(TransitionEditorSectionItem *parent);
+    explicit TransitionEditorBarItem(TransitionEditorPropertyItem *parent);
+
+    void itemMoved(const QPointF &start, const QPointF &end) override;
+    void commitPosition(const QPointF &point) override;
+
+protected:
+    void scrollOffsetChanged() override;
+    void paint(QPainter *painter,
+               const QStyleOptionGraphicsItem *option,
+               QWidget *widget = nullptr) override;
+    void hoverMoveEvent(QGraphicsSceneHoverEvent *) override;
+    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event) override;
+    void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
+
+private:
+    TransitionEditorSectionItem *sectionItem() const;
+    TransitionEditorPropertyItem *propertyItem() const;
+
+    void dragInit(const QRectF &rect, const QPointF &pos);
+    void dragCenter(QRectF rect, const QPointF &pos, qreal min, qreal max);
+    void dragHandle(QRectF rect, const QPointF &pos, qreal min, qreal max);
+    bool handleRects(const QRectF &rect, QRectF &left, QRectF &right) const;
+    bool isActiveHandle(Location location) const;
+
+    void setOutOfBounds(Location location);
+    bool validateBounds(qreal pivot);
+
+private:
+    Location m_handle = Location::Undefined;
+
+    Location m_bounds = Location::Undefined;
+
+    qreal m_pivot = 0.0;
+
+    QRectF m_oldRect;
+
+    static constexpr qreal minimumBarWidth = 2.0
+                                             * static_cast<qreal>(TimelineConstants::sectionHeight);
+};
+
+class TransitionEditorSectionItem : public TimelineItem
+{
+    Q_OBJECT
+
+public:
+    enum { Type =  TransitionEditorConstants::transitionEditorSectionItemUserType };
+
+    static TransitionEditorSectionItem *create(const ModelNode &animation,
+                                       TimelineItem *parent);
+
+    void invalidateBar();
+
+    int type() const override;
+
+    static void updateData(QGraphicsItem *item);
+    static void invalidateBar(QGraphicsItem *item);
+    static void updateDataForTarget(QGraphicsItem *item, const ModelNode &target, bool *b);
+
+    void moveAllDurations(qreal offset);
+    void scaleAllDurations(qreal scale);
+    qreal firstFrame();
+    AbstractView *view() const;
+    bool isSelected() const;
+
+    ModelNode targetNode() const;
+    void updateData();
+
+protected:
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
+    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event) override;
+    void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
+    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override;
+    void resizeEvent(QGraphicsSceneResizeEvent *event) override;
+    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event) override;
+
+private:
+    void invalidateHeight();
+    void invalidateProperties();
+    bool collapsed() const;
+    qreal rulerWidth() const;
+    void toggleCollapsed();
+    void createPropertyItems();
+    const QList<QGraphicsItem *> propertyItems() const;
+
+    TransitionEditorSectionItem(TimelineItem *parent = nullptr);
+    ModelNode m_targetNode;
+    ModelNode m_animationNode;
+
+    TransitionEditorBarItem *m_barItem = nullptr;
+    TimelineItem *m_dummyItem = nullptr;
+};
+
+} // namespace QmlDesigner