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diff --git a/slideshow/source/inc/basecontainernode.hxx b/slideshow/source/inc/basecontainernode.hxx
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index 000000000..79dbe3f2f
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+++ b/slideshow/source/inc/basecontainernode.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_SLIDESHOW_SOURCE_INC_BASECONTAINERNODE_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_BASECONTAINERNODE_HXX
+
+#include "basenode.hxx"
+
+namespace slideshow::internal {
+
+class BaseContainerNode;
+typedef ::std::shared_ptr< BaseContainerNode > BaseContainerNodeSharedPtr;
+
+
+/** This interface extends BaseNode with child handling methods.
+    Used for XAnimationNode objects which have children
+*/
+class BaseContainerNode : public BaseNode
+{
+public:
+    BaseContainerNode(
+        css::uno::Reference<css::animations::XAnimationNode> const& xNode,
+        BaseContainerNodeSharedPtr const& pParent,
+        NodeContext const& rContext );
+
+    /** Add given child node to this container
+     */
+    void appendChildNode( AnimationNodeSharedPtr const& pNode );
+
+#if defined(DBG_UTIL)
+    virtual void showState() const override;
+    virtual const char* getDescription() const override { return "BaseContainerNode"; }
+#endif
+
+protected:
+    // overrides from BaseNode
+    virtual void dispose() override;
+
+private:
+    virtual bool init_st() override;
+    bool init_children();
+    virtual void deactivate_st( NodeState eDestState ) override;
+    virtual bool hasPendingAnimation() const override;
+    // force to be implemented by derived class:
+    virtual void activate_st() override = 0;
+    virtual void notifyDeactivating(
+        AnimationNodeSharedPtr const& rNotifier ) override = 0;
+
+protected:
+    bool isDurationIndefinite() const { return mbDurationIndefinite; }
+
+    bool isChildNode( AnimationNodeSharedPtr const& pNode ) const;
+
+    /// @return true: if all children have been deactivated
+    bool notifyDeactivatedChild( AnimationNodeSharedPtr const& pChildNode );
+
+    void repeat();
+
+    template <typename FuncT>
+    void forEachChildNode( FuncT func,
+                                  int nodeStateMask ) const
+    {
+        for (AnimationNodeSharedPtr const& pNode : maChildren) {
+            if (nodeStateMask != -1 && (pNode->getState() & nodeStateMask) == 0)
+                continue;
+            func(pNode);
+        }
+    }
+
+    typedef ::std::vector<AnimationNodeSharedPtr> VectorOfNodes;
+    VectorOfNodes       maChildren;
+    ::std::size_t       mnFinishedChildren;
+    double       mnLeftIterations;
+
+private:
+    const bool          mbRepeatIndefinite;
+    const bool          mbRestart;
+    const bool          mbDurationIndefinite;
+};
+
+} // namespace presentation::interface
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */