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diff --git a/src/plugins/qmldesigner/components/transitioneditor/transitioneditorwidget.h b/src/plugins/qmldesigner/components/transitioneditor/transitioneditorwidget.h
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+++ b/src/plugins/qmldesigner/components/transitioneditor/transitioneditorwidget.h
@@ -0,0 +1,103 @@
+/****************************************************************************
+**
+** 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 "timelineeditor/timelineutils.h"
+
+#include <coreplugin/icontext.h>
+
+#include <QWidget>
+
+#include <functional>
+
+QT_FORWARD_DECLARE_CLASS(QComboBox)
+QT_FORWARD_DECLARE_CLASS(QGraphicsView)
+QT_FORWARD_DECLARE_CLASS(QLabel)
+QT_FORWARD_DECLARE_CLASS(QResizeEvent)
+QT_FORWARD_DECLARE_CLASS(QScrollBar)
+QT_FORWARD_DECLARE_CLASS(QShowEvent)
+QT_FORWARD_DECLARE_CLASS(QString)
+QT_FORWARD_DECLARE_CLASS(QPushButton)
+
+namespace QmlDesigner {
+
+class TransitionEditorView;
+class TransitionEditorToolBar;
+class TransitionEditorGraphicsScene;
+class ModelNode;
+
+class TransitionEditorWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit TransitionEditorWidget(TransitionEditorView *view);
+    void contextHelp(const Core::IContext::HelpCallback &callback) const;
+
+    TransitionEditorGraphicsScene *graphicsScene() const;
+    TransitionEditorView *transitionEditorView() const;
+    TransitionEditorToolBar *toolBar() const;
+
+    void init();
+    void reset();
+
+    void setupScrollbar(int min, int max, int current);
+    void changeScaleFactor(int factor);
+
+    void updateData(const ModelNode &transition);
+public slots:
+    void selectionChanged();
+    void scroll(const TimelineUtils::Side &side);
+
+protected:
+    void showEvent(QShowEvent *event) override;
+    void resizeEvent(QResizeEvent *event) override;
+
+private:
+    void connectToolbar();
+    void setTransitionActive(bool b);
+    void openEasingCurveEditor();
+
+    TransitionEditorToolBar *m_toolbar = nullptr;
+
+    QGraphicsView *m_rulerView = nullptr;
+
+    QGraphicsView *m_graphicsView = nullptr;
+
+    QScrollBar *m_scrollbar = nullptr;
+
+    QLabel *m_statusBar = nullptr;
+
+    TransitionEditorView *m_transitionEditorView = nullptr;
+
+    TransitionEditorGraphicsScene *m_graphicsScene;
+
+    QPushButton *m_addButton = nullptr;
+
+    QWidget *m_onboardingContainer = nullptr;
+};
+
+} // namespace QmlDesigner