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diff --git a/tools/qmlpreview/qmlpreviewfilesystemwatcher.h b/tools/qmlpreview/qmlpreviewfilesystemwatcher.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 QMLPREVIEWFILESYSTEMWATCHER_H
+#define QMLPREVIEWFILESYSTEMWATCHER_H
+
+#include <QtCore/qfilesystemwatcher.h>
+#include <QtCore/qobject.h>
+#include <QtCore/qset.h>
+
+class QmlPreviewFileSystemWatcher : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit QmlPreviewFileSystemWatcher(QObject *parent = nullptr);
+
+    void addFile(const QString &file);
+    void removeFile(const QString &file);
+    bool watchesFile(const QString &file) const;
+
+    void addDirectory(const QString &file);
+    void removeDirectory(const QString &file);
+    bool watchesDirectory(const QString &file) const;
+
+signals:
+    void fileChanged(const QString &path);
+    void directoryChanged(const QString &path);
+
+private:
+    using WatchEntrySet = QSet<QString>;
+    using WatchEntrySetIterator = WatchEntrySet::iterator;
+
+    void onDirectoryChanged(const QString &path);
+
+    WatchEntrySet m_files;
+    WatchEntrySet m_directories;
+
+    // Directories watched either explicitly or implicitly through files contained in them.
+    QHash<QString, int> m_directoryCount;
+
+    QFileSystemWatcher *m_watcher = nullptr;
+};
+
+#endif // QMLPREVIEWFILESYSTEMWATCHER_H