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diff --git a/src/datasources/timeusagesourcebase.h b/src/datasources/timeusagesourcebase.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of UsageStatistic plugin for 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 <QtCore/QObject>
+#include <QtCore/QElapsedTimer>
+
+#include <KUserFeedback/AbstractDataSource>
+
+namespace UsageStatistic {
+namespace Internal {
+
+//! Base class for all time trackers
+class TimeUsageSourceBase : public QObject, public KUserFeedback::AbstractDataSource
+{
+    Q_OBJECT
+
+public:
+    ~TimeUsageSourceBase() override;
+
+public:  // AbstractDataSource interface
+    /*! The output data format is:
+     *  {
+     *      "startCount": int,
+     *      "usageTime" : int
+     *  }
+     */
+    QVariant data() override;
+
+    void loadImpl(QSettings *settings) override;
+    void storeImpl(QSettings *settings) override;
+    void resetImpl(QSettings *settings) override;
+
+protected:
+    TimeUsageSourceBase(const QString &id);
+
+    void onStarted();
+    void onStopped();
+
+    bool isTimeTrackingActive() const;
+
+Q_SIGNALS:
+    void start();
+    void stop();
+
+private:
+    static constexpr qint64 usageTimeDflt() { return 0; }
+    static constexpr qint64 startCountDflt() { return 0; }
+
+private:
+    QElapsedTimer m_timer;
+    qint64 m_usageTime = usageTimeDflt();
+    qint64 m_startCount = startCountDflt();
+};
+
+} // namespace Internal
+} // namespace UsageStatistic