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diff --git a/sd/source/ui/presenter/CanvasUpdateRequester.hxx b/sd/source/ui/presenter/CanvasUpdateRequester.hxx
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+/*************************************************************************
+ *
+ *  OpenOffice.org - a multi-platform office productivity suite
+ *
+ *  $RCSfile: CanvasUpdateRequester.hxx,v $
+ *
+ *  $Revision: 1.2 $
+ *
+ *  last change: $Author: kz $ $Date: 2008-04-03 14:06:05 $
+ *
+ *  The Contents of this file are made available subject to
+ *  the terms of GNU Lesser General Public License Version 2.1.
+ *
+ *
+ *    GNU Lesser General Public License Version 2.1
+ *    =============================================
+ *    Copyright 2005 by Sun Microsystems, Inc.
+ *    901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *    This library is free software; you can redistribute it and/or
+ *    modify it under the terms of the GNU Lesser General Public
+ *    License version 2.1, as published by the Free Software Foundation.
+ *
+ *    This library is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *    Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with this library; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *    MA  02111-1307  USA
+ *
+ ************************************************************************/
+
+#ifndef SD_PRESENTER_CANVAS_UPDATE_REQUESTER_HEADER
+#define SD_PRESENTER_CANVAS_UPDATE_REQUESTER_HEADER
+
+#include "precompiled_sd.hxx"
+
+#include <com/sun/star/rendering/XSpriteCanvas.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <sal/types.h>
+#include <tools/solar.h>
+#include <tools/link.hxx>
+#include <vector>
+
+namespace css = ::com::sun::star;
+
+namespace sd { namespace presenter {
+
+/** Each UpdateRequester handles update requests (calls to
+    XCanvas::updateScreen()) for one shared canvas (a canvas that has one or
+    more PresenterCanvas wrappers).  Multiple calls are collected and lead
+    to a single call to updateScreen.
+*/
+class CanvasUpdateRequester : private ::boost::noncopyable
+{
+public:
+    /** Return the Canvas UpdateRequester object for the given shared
+        canvas.  A new object is created when it does not already exist.
+    */
+    static ::boost::shared_ptr<CanvasUpdateRequester> Instance (
+        const css::uno::Reference<css::rendering::XSpriteCanvas>& rxCanvas);
+
+    void RequestUpdate (const sal_Bool bUpdateAll);
+
+private:
+    CanvasUpdateRequester (const css::uno::Reference<css::rendering::XSpriteCanvas>& rxCanvas);
+    ~CanvasUpdateRequester (void);
+    class Deleter; friend class Deleter;
+
+    typedef ::std::vector<
+        ::std::pair<
+            css::uno::Reference<css::rendering::XSpriteCanvas>,
+           ::boost::shared_ptr<CanvasUpdateRequester> > > RequesterMap;
+    static RequesterMap maRequesterMap;
+
+    css::uno::Reference<css::rendering::XSpriteCanvas> mxCanvas;
+    ULONG mnUserEventId;
+    sal_Bool mbUpdateFlag;
+    DECL_LINK(Callback, void*);
+};
+
+} } // end of namespace ::sd::presenter
+
+#endif