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diff --git a/slideshow/source/engine/shapes/externalshapebase.hxx b/slideshow/source/engine/shapes/externalshapebase.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_ENGINE_SHAPES_EXTERNALSHAPEBASE_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_SHAPES_EXTERNALSHAPEBASE_HXX
+
+#include <iexternalmediashapebase.hxx>
+#include <unoview.hxx>
+#include <slideshowcontext.hxx>
+
+
+namespace slideshow
+{
+    namespace internal
+    {
+        /** Base class for shapes rendered by external engines.
+
+            Used as the common base for e.g. MediaShape or
+            AppletShape, all of which are rendered by external
+            components (and all employ distinct windows).
+
+            Please note that this base class indeed assumes the shape
+            does not interfere with the internal shapes in any way
+            (including mutual overdraw). It therefore reports yes for
+            the isBackgroundDetached() question.
+         */
+        class ExternalShapeBase : public IExternalMediaShapeBase
+        {
+        public:
+            /** Create a shape for the given XShape for an external shape
+
+                @param xShape
+                The XShape to represent.
+
+                @param nPrio
+                Externally-determined shape priority (used e.g. for
+                paint ordering). This number _must be_ unique!
+             */
+            ExternalShapeBase( const css::uno::Reference< css::drawing::XShape >&   xShape,
+                               double                                       nPrio,
+                               const SlideShowContext&                      rContext ); // throw ShapeLoadFailedException;
+            virtual ~ExternalShapeBase() override;
+
+            virtual css::uno::Reference< css::drawing::XShape > getXShape() const override;
+
+            // animation methods
+
+
+            virtual void play() override;
+            virtual void stop() override;
+            virtual void pause() override;
+            virtual bool isPlaying() const override;
+            virtual void setMediaTime(double) override;
+
+            // render methods
+
+
+            virtual bool update() const override;
+            virtual bool render() const override;
+            virtual bool isContentChanged() const override;
+
+
+            // Shape attributes
+
+
+            virtual ::basegfx::B2DRectangle getBounds() const override;
+            virtual ::basegfx::B2DRectangle getDomBounds() const override;
+            virtual ::basegfx::B2DRectangle getUpdateArea() const override;
+            virtual bool   isVisible() const override;
+            virtual double getPriority() const override;
+            virtual bool   isBackgroundDetached() const override;
+
+        protected:
+            const css::uno::Reference<css::uno::XComponentContext>  mxComponentContext;
+
+        private:
+            class ExternalShapeBaseListener; friend class ExternalShapeBaseListener;
+
+            /// override in derived class to render preview
+            virtual bool implRender( const ::basegfx::B2DRange& rCurrBounds ) const = 0;
+
+            /// override in derived class to resize
+            virtual void implViewChanged( const UnoViewSharedPtr& rView ) = 0;
+            /// override in derived class to resize
+            virtual void implViewsChanged() = 0;
+
+            /// override in derived class to start external viewer
+            virtual bool implStartIntrinsicAnimation() = 0;
+            /// override in derived class to stop external viewer
+            virtual bool implEndIntrinsicAnimation() = 0;
+            /// override in derived class to pause external viewer
+            virtual void implPauseIntrinsicAnimation() = 0;
+            /// override in derived class to return status of animation
+            virtual bool implIsIntrinsicAnimationPlaying() const = 0;
+            /// override in derived class to set media time
+            virtual void implSetIntrinsicAnimationTime(double) = 0;
+
+
+            /// The associated XShape
+            css::uno::Reference< css::drawing::XShape >                             mxShape;
+
+            std::shared_ptr<ExternalShapeBaseListener>                            mpListener;
+
+            SubsettableShapeManagerSharedPtr                                        mpShapeManager;
+            EventMultiplexer&                                                       mrEventMultiplexer;
+
+            // The attributes of this Shape
+            const double                                                            mnPriority;
+            ::basegfx::B2DRectangle                                                 maBounds;
+        };
+    }
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_SHAPES_EXTERNALSHAPEBASE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */