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diff --git a/sdext/source/presenter/PresenterTimer.hxx b/sdext/source/presenter/PresenterTimer.hxx
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+++ b/sdext/source/presenter/PresenterTimer.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SDEXT_SOURCE_PRESENTER_PRESENTERTIMER_HXX
+#define INCLUDED_SDEXT_SOURCE_PRESENTER_PRESENTERTIMER_HXX
+
+#include <com/sun/star/awt/XCallback.hpp>
+#include <com/sun/star/awt/XRequestCallback.hpp>
+#include <cppuhelper/basemutex.hxx>
+#include <cppuhelper/compbase.hxx>
+#include <osl/mutex.hxx>
+#include <osl/time.h>
+#include <rtl/ref.hxx>
+#include <sal/types.h>
+
+#include <functional>
+#include <memory>
+#include <vector>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+namespace sdext::presenter {
+
+/** The timer allows tasks to be scheduled for execution at a specified time
+    in the future.
+*/
+class PresenterTimer
+{
+public:
+    /** A task is called with the current time.
+    */
+    typedef ::std::function<void (const TimeValue&)> Task;
+
+    static const sal_Int32 NotAValidTaskId = 0;
+
+    /** Schedule a task to be executed repeatedly.  The task is executed the
+        first time after nFirst nano-seconds (1000000000 corresponds to one
+        second).  After that task is executed in intervals that are
+        nInterval ns long until CancelTask is called.
+    */
+    static sal_Int32 ScheduleRepeatedTask (
+        const css::uno::Reference<css::uno::XComponentContext>& xContext,
+        const Task& rTask,
+        const sal_Int64 nFirst,
+        const sal_Int64 nInterval);
+
+    static void CancelTask (const sal_Int32 nTaskId);
+};
+
+typedef cppu::WeakComponentImplHelper<
+    css::awt::XCallback
+    > PresenterClockTimerInterfaceBase;
+
+/** A timer that calls its listeners, typically clocks, every second to
+    update their current time value.
+*/
+class PresenterClockTimer
+    : protected ::cppu::BaseMutex,
+      public PresenterClockTimerInterfaceBase
+{
+public:
+    class Listener {
+    public:
+        virtual void TimeHasChanged (const oslDateTime& rCurrentTime) = 0;
+
+    protected:
+        ~Listener() {}
+    };
+    typedef std::shared_ptr<Listener> SharedListener;
+
+    static ::rtl::Reference<PresenterClockTimer> Instance (
+        const css::uno::Reference<css::uno::XComponentContext>& rxContext);
+
+    void AddListener (const SharedListener& rListener);
+    void RemoveListener (const SharedListener& rListener);
+
+    static oslDateTime GetCurrentTime();
+
+    // XCallback
+
+    virtual void SAL_CALL notify (const css::uno::Any& rUserData) override;
+
+private:
+    static ::rtl::Reference<PresenterClockTimer> mpInstance;
+
+    ::osl::Mutex maMutex;
+    typedef ::std::vector<SharedListener> ListenerContainer;
+    ListenerContainer maListeners;
+    oslDateTime maDateTime;
+    sal_Int32 mnTimerTaskId;
+    bool mbIsCallbackPending;
+    css::uno::Reference<css::awt::XRequestCallback> mxRequestCallback;
+    const css::uno::Reference<css::uno::XComponentContext> m_xContext;
+
+    PresenterClockTimer (
+        const css::uno::Reference<css::uno::XComponentContext>& rxContext);
+    virtual ~PresenterClockTimer() override;
+
+    void CheckCurrentTime (const TimeValue& rCurrentTime);
+};
+
+} // end of namespace ::sdext::presenter
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */