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diff --git a/src/gui/editors/notation/NotationGroup.h b/src/gui/editors/notation/NotationGroup.h
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+
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <glaurent@telegraph-road.org>,
+        Chris Cannam        <cannam@all-day-breakfast.com>,
+        Richard Bown        <richard.bown@ferventsoftware.com>
+
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _RG_NOTATIONGROUP_H_
+#define _RG_NOTATIONGROUP_H_
+
+#include "base/Sets.h"
+#include <utility>
+#include "base/Event.h"
+#include "NotationElement.h"
+
+
+
+
+namespace Rosegarden
+{
+
+class Quantizer;
+class NotationStaff;
+class NotationProperties;
+class Key;
+class Clef;
+
+
+/// Several sorts of "Beamed Group"
+
+class NotationGroup : public AbstractSet<NotationElement,
+                                         NotationElementList>
+{
+public:
+    typedef NotationElementList::iterator NELIterator;
+
+    enum Type { Beamed, Tupled };
+
+    /// Group contents will be sampled from elements surrounding elementInGroup
+    NotationGroup(NotationElementList &nel, NELIterator elementInGroup,
+                  const Quantizer *,
+                  std::pair<timeT, timeT> barRange,
+                  const NotationProperties &properties,
+                  const Clef &clef, const Key &key);
+
+    /// Caller intends to call sample() for each item in the group, _in order_
+    NotationGroup(NotationElementList &nel,
+                  const Quantizer *,
+                  const NotationProperties &properties,
+                  const Clef &clef, const Key &key);
+
+    virtual ~NotationGroup();
+
+    Type getGroupType() const { return m_type; }
+
+    /**
+     * Writes the BEAMED, BEAM_ABOVE, and STEM_UP properties into the
+     * notes in the group, as appropriate.  Does not require layout x
+     * coordinates to have been set.
+     */
+    void applyStemProperties();
+
+    /**
+     * Writes beam data into each note in the group.  Notes' layout x
+     * coordinates must already have been set.  Does not require
+     * applyStemProperties to have already been called.
+     */
+    void applyBeam(NotationStaff &);
+
+    /**
+     * Writes tupling line data into each note in the group.  Notes'
+     * layout x coordinates must already have been set.  Does nothing
+     * if this is not a tupled group.
+     */
+    void applyTuplingLine(NotationStaff &);
+
+    virtual bool contains(const NELIterator &) const;
+
+    virtual bool sample(const NELIterator &i, bool goingForwards);
+
+protected:
+    virtual bool test(const NELIterator &i);
+
+private:
+    struct Beam
+    {                           // if a beam has a line equation y = mx + c,
+        int  gradient;          // -- then this is m*100 (i.e. a percentage)
+        int  startY;            // -- and this is c
+        bool aboveNotes;
+        bool necessary;
+    };
+
+    Beam calculateBeam(NotationStaff &);
+
+    int height(const NELIterator&) const;
+
+    bool haveInternalRest() const;
+
+    //--------------- Data members ---------------------------------
+
+    std::pair<timeT, timeT> m_barRange;
+    const Clef &m_clef;
+    const Key &m_key;
+    int m_weightAbove, m_weightBelow;
+    bool m_userSamples;
+    long m_groupNo;
+    Type m_type;
+
+    const NotationProperties &m_properties;
+};
+
+
+}
+
+#endif