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diff --git a/include/vcl/task.hxx b/include/vcl/task.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_TASK_HXX
+#define INCLUDED_VCL_TASK_HXX
+
+#include <vcl/dllapi.h>
+#include <memory>
+
+class Scheduler;
+struct ImplSchedulerData;
+
+enum class TaskPriority
+{
+    HIGHEST      = 0,
+    HIGH         = 1,
+    RESIZE       = 2,
+    REPAINT      = 3,
+    MEDIUM       = 3,
+    POST_PAINT   = 4,
+    DEFAULT_IDLE = 5,
+    LOW          = 6,
+    LOWER        = 7,
+    LOWEST       = 8
+};
+
+class VCL_DLLPUBLIC Task
+{
+    friend class Scheduler;
+    friend struct ImplSchedulerData;
+
+    ImplSchedulerData *mpSchedulerData; ///< Pointer to the element in scheduler list
+    const sal_Char    *mpDebugName;     ///< Useful for debugging
+    TaskPriority       mePriority;      ///< Task priority
+    bool               mbActive;        ///< Currently in the scheduler
+
+protected:
+    static void StartTimer( sal_uInt64 nMS );
+
+    const ImplSchedulerData* GetSchedulerData() const { return mpSchedulerData; }
+
+    virtual void SetDeletionFlags();
+    /// Is this item ready to be dispatched at nTimeNow
+    virtual bool ReadyForSchedule( bool bIdle, sal_uInt64 nTimeNow ) const = 0;
+    /// Schedule only when other timers and events are processed
+    virtual bool IsIdle() const = 0;
+    /**
+     * Adjust nMinPeriod downwards if we want to be notified before
+     * then, nTimeNow is the current time.
+     */
+    virtual sal_uInt64 UpdateMinPeriod( sal_uInt64 nMinPeriod, sal_uInt64 nTimeNow ) const = 0;
+
+public:
+    Task( const sal_Char *pDebugName );
+    Task( const Task& rTask );
+    virtual ~Task() COVERITY_NOEXCEPT_FALSE;
+    Task& operator=( const Task& rTask );
+
+    void            SetPriority(TaskPriority ePriority) { mePriority = ePriority; }
+    TaskPriority    GetPriority() const { return mePriority; }
+
+    void            SetDebugName( const sal_Char *pDebugName ) { mpDebugName = pDebugName; }
+    const char     *GetDebugName() const { return mpDebugName; }
+
+    // Call handler
+    virtual void    Invoke() = 0;
+
+    virtual void    Start();
+    void            Stop();
+
+    bool            IsActive() const { return mbActive; }
+};
+
+#endif // INCLUDED_VCL_TASK_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */