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diff --git a/sd/source/ui/inc/tools/IdleDetection.hxx b/sd/source/ui/inc/tools/IdleDetection.hxx
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+++ b/sd/source/ui/inc/tools/IdleDetection.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 .
+ */
+
+#pragma once
+
+#include <o3tl/typed_flags_set.hxx>
+
+namespace vcl { class Window; }
+
+namespace sd::tools {
+    enum class IdleState {
+        /** When GetIdleState() returns this value, then the system is idle.
+        */
+        Idle = 0x0000,
+
+        /** There are system event pending.
+        */
+        SystemEventPending = 0x0001,
+
+        /** A full screen slide show is running and is active.  In contrast
+            there may be a full screen show be running in an inactive window,
+            i.e. in the background.
+        */
+        FullScreenShowActive = 0x0002,
+
+        /** A slide show is running in a window.
+        */
+        WindowShowActive = 0x0004,
+
+        /** A window is being painted.
+        */
+        WindowPainting = 0x0008,
+    };
+} // end of namespace ::sd::tools
+namespace o3tl {
+    template<> struct typed_flags<::sd::tools::IdleState> : is_typed_flags<::sd::tools::IdleState, 0x0f> {};
+}
+
+namespace sd::tools {
+
+/** Detect whether the system is idle and some time consuming operation may
+    be carried out.  This class distinguishes between different states of
+    idle-ness.
+*/
+class IdleDetection
+{
+public:
+    /** Determine whether the system is idle.
+        @param pWindow
+            When a valid Window pointer is given then it is checked
+            whether the window is currently being painting.
+        @return
+            This method either returns IdleState::Idle or a combination of
+            IdleStates values or-ed together that describe what the system
+            is currently doing so that the caller can decide what to do.
+    */
+    static IdleState GetIdleState (const vcl::Window* pWindow);
+
+private:
+    /** Check whether there are input events pending.
+    */
+    static IdleState CheckInputPending();
+
+    /** Check whether a slide show is running full screen or in a window.
+    */
+    static IdleState CheckSlideShowRunning();
+
+    static IdleState CheckWindowPainting (const vcl::Window& rWindow);
+};
+
+} // end of namespace ::sd::tools
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */