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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 -*- */
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef SDEXT_PRESENTER_TIMER_HXX
+#define SDEXT_PRESENTER_TIMER_HXX
+
+#include <com/sun/star/awt/XCallback.hpp>
+#include <com/sun/star/awt/XRequestCallback.hpp>
+#include <cppuhelper/basemutex.hxx>
+#include <cppuhelper/compbase1.hxx>
+#include <osl/mutex.hxx>
+#include <osl/time.h>
+#include <rtl/ref.hxx>
+#include <sal/types.h>
+#include <boost/enable_shared_from_this.hpp>
+#include <boost/function.hpp>
+#include <vector>
+
+namespace css = ::com::sun::star;
+
+namespace sdext { namespace presenter {
+
+class PresenterClockInternalTimer;
+
+/** 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 ::boost::function<void(const TimeValue&)> Task;
+
+    static const sal_Int32 NotAValidTaskId = 0;
+
+    static sal_Int32 ScheduleSingleTaskRelative (
+        const Task& rTask,
+        const sal_Int64 nDelay);
+
+    static sal_Int32 ScheduleSingleTaskAbsolute (
+        const Task& rTask,
+        const TimeValue& rDueTime);
+
+    /** 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 intervalls that are
+        nIntervall ns long until CancelTask is called.
+    */
+    static sal_Int32 ScheduleRepeatedTask (
+        const Task& rTask,
+        const sal_Int64 nFirst,
+        const sal_Int64 nIntervall);
+
+    static void CancelTask (const sal_Int32 nTaskId);
+};
+
+
+
+typedef cppu::WeakComponentImplHelper1<
+    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;
+    };
+    typedef ::boost::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 (void);
+
+    /** Return the difference between the two different times in
+        nanoseconds.
+    */
+    static sal_Int64 GetTimeDifference (const oslDateTime& rNow, const oslDateTime& rThen);
+
+    // XCallback
+
+    virtual void SAL_CALL notify (const css::uno::Any& rUserData)
+        throw (css::uno::RuntimeException);
+
+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;
+
+    PresenterClockTimer (
+        const css::uno::Reference<css::uno::XComponentContext>& rxContext);
+    ~PresenterClockTimer (void);
+
+    void CheckCurrentTime (const TimeValue& rCurrentTime);
+};
+
+
+
+
+
+} } // end of namespace ::sdext::presenter
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */