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diff --git a/include/vcl/scheduler.hxx b/include/vcl/scheduler.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_VCL_SCHEDULER_HXX
+#define INCLUDED_VCL_SCHEDULER_HXX
+
+#include <vcl/dllapi.h>
+
+struct ImplSVData;
+class Scheduler;
+struct ImplSchedulerData
+{
+    ImplSchedulerData*  mpNext;      // Pointer to the next element in list
+    Scheduler*          mpScheduler;      // Pointer to VCL Idle instance
+    bool                mbDelete;    // Destroy this idle?
+    bool                mbInScheduler;    // Idle handler currently processed?
+    sal_uLong           mnUpdateTime;   // Last Update Time
+    sal_uLong           mnUpdateStack;  // Update Stack on stack
+
+    void Invoke();
+
+    static ImplSchedulerData *GetMostImportantTask( bool bTimer );
+};
+
+enum class SchedulerPriority {
+    HIGHEST   = 0,
+    HIGH      = 1,
+    REPAINT   = 2,
+    RESIZE    = 3,
+    MEDIUM    = 3,
+    LOW       = 4,
+    LOWER     = 5,
+    LOWEST    = 6
+};
+
+class VCL_DLLPUBLIC Scheduler
+{
+protected:
+    ImplSchedulerData*  mpSchedulerData;    // Pointer to element in idle list
+    sal_Int32           miPriority;         // Idle priority ( maybe divergent to default)
+    SchedulerPriority   meDefaultPriority;  // Default idle priority
+    bool                mbActive;           // Currently in the scheduler
+
+    friend struct ImplSchedulerData;
+    virtual void SetDeletionFlags();
+    virtual bool ReadyForSchedule( bool bTimer ) { return !bTimer; }
+
+public:
+    Scheduler();
+    Scheduler( const Scheduler& rScheduler );
+    virtual ~Scheduler();
+
+    void SetPriority( SchedulerPriority ePriority );
+    void SetSchedulingPriority( sal_Int32 iPriority );
+    sal_Int32    GetPriority() const { return miPriority; }
+    SchedulerPriority GetDefaultPriority() const { return meDefaultPriority; }
+
+    // Call idle handler
+    virtual void    Invoke() = 0;
+
+    virtual void    Start();
+    virtual void    Stop();
+
+    bool            IsActive() const { return mbActive; }
+
+    Scheduler&          operator=( const Scheduler& Scheduler );
+    static void ImplDeInitScheduler();
+
+    /// Process all pending idle tasks ahead of time in priority order.
+    static void CallbackTaskScheduling();
+    static void ProcessTaskScheduling( bool bTimer );
+};
+
+#endif // INCLUDED_VCL_SCHEDULER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */