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diff --git a/src/plugins/qmltooling/qmldbg_preview/qqmlpreviewservice.h b/src/plugins/qmltooling/qmldbg_preview/qqmlpreviewservice.h
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index 0000000000..6c35ef52dd
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+++ b/src/plugins/qmltooling/qmldbg_preview/qqmlpreviewservice.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of th 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 QQMLPREVIEWSERVICE_H
+#define QQMLPREVIEWSERVICE_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 "qqmlpreviewhandler.h"
+#include "qqmlpreviewfileengine.h"
+#include <private/qqmldebugserviceinterfaces_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QQmlPreviewFileEngineHandler;
+class QQmlPreviewHandler;
+class QQmlPreviewServiceImpl : public QQmlDebugService
+{
+    Q_OBJECT
+
+public:
+    enum Command {
+        File,
+        Load,
+        Request,
+        Error,
+        Rerun,
+        Directory,
+        ClearCache,
+        Zoom
+    };
+
+    static const QString s_key;
+
+    QQmlPreviewServiceImpl(QObject *parent = nullptr);
+    virtual ~QQmlPreviewServiceImpl();
+
+    void messageReceived(const QByteArray &message) override;
+    void engineAboutToBeAdded(QJSEngine *engine) override;
+    void engineAboutToBeRemoved(QJSEngine *engine) override;
+    void stateChanged(State state) override;
+
+    void forwardRequest(const QString &file);
+    void forwardError(const QString &error);
+
+signals:
+    void error(const QString &file);
+    void file(const QString &file, const QByteArray &contents);
+    void directory(const QString &file, const QStringList &entries);
+    void load(const QUrl &url);
+    void rerun();
+    void clearCache();
+    void zoom(qreal factor);
+
+private:
+    QScopedPointer<QQmlPreviewFileEngineHandler> m_fileEngine;
+    QScopedPointer<QQmlPreviewFileLoader> m_loader;
+    QQmlPreviewHandler m_handler;
+    QUrl m_currentUrl;
+};
+
+QT_END_NAMESPACE
+
+#endif // QQMLPREVIEWSERVICE_H