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diff --git a/src/plugins/qmltooling/qmldbg_preview/qqmlpreviewhandler.h b/src/plugins/qmltooling/qmldbg_preview/qqmlpreviewhandler.h
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+++ b/src/plugins/qmltooling/qmldbg_preview/qqmlpreviewhandler.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QML preview debug service.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 QQMLPREVIEWHANDLER_H
+#define QQMLPREVIEWHANDLER_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qqmlpreviewposition.h"
+
+#include <QtCore/qobject.h>
+#include <QtCore/qvector.h>
+#include <QtCore/qrect.h>
+#include <QtCore/qpointer.h>
+#include <QtQml/qqmlengine.h>
+
+QT_BEGIN_NAMESPACE
+
+class QQmlEngine;
+class QQuickItem;
+class QQmlPreviewUrlInterceptor;
+class QQuickWindow;
+class QQmlPreviewHandler : public QObject
+{
+    Q_OBJECT
+public:
+    explicit QQmlPreviewHandler(QObject *parent = nullptr);
+    ~QQmlPreviewHandler();
+
+    void addEngine(QQmlEngine *engine);
+    void removeEngine(QQmlEngine *engine);
+
+    void loadUrl(const QUrl &url);
+    void rerun();
+    void zoom(qreal newFactor);
+
+    void clear();
+
+signals:
+    void error(const QString &message);
+protected:
+    bool eventFilter(QObject *obj, QEvent *event);
+private:
+    void tryCreateObject();
+    void showObject(QObject *object);
+
+    QScopedPointer<QQuickItem> m_dummyItem;
+    QList<QQmlEngine *> m_engines;
+    QVector<QPointer<QObject>> m_createdObjects;
+    QScopedPointer<QQmlComponent> m_component;
+    QPointer<QQuickWindow> m_currentWindow;
+    bool m_supportsMultipleWindows;
+    QQmlPreviewPosition m_lastPosition;
+};
+
+QT_END_NAMESPACE
+
+#endif // QQMLPREVIEWHANDLER_H