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diff --git a/src/gui/editors/matrix/MatrixHLayout.h b/src/gui/editors/matrix/MatrixHLayout.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_MATRIXHLAYOUT_H_
+#define _RG_MATRIXHLAYOUT_H_
+
+#include "base/FastVector.h"
+#include "base/LayoutEngine.h"
+#include <utility>
+#include "base/Event.h"
+
+#include "gui/general/HZoomable.h"
+
+
+
+namespace Rosegarden
+{
+
+class TimeSignature;
+class Staff;
+class Composition;
+
+
+class MatrixHLayout : public HorizontalLayoutEngine
+{
+public:
+    MatrixHLayout(Composition *c);
+    virtual ~MatrixHLayout();
+
+    /**
+     * Resets internal data stores for all staffs
+     */
+    virtual void reset();
+
+    /**
+     * Resets internal data stores for a specific staff
+     */
+    virtual void resetStaff(Staff &staff,
+                            timeT = 0,
+                            timeT = 0);
+
+    /**
+     * Returns the total length of all elements once layout is done.
+     * This is the x-coord of the end of the last element on the
+     * longest staff
+     */
+    virtual double getTotalWidth() const;
+
+    /**
+     * Returns the number of the first visible bar line
+     */
+    virtual int getFirstVisibleBar() const;
+
+    /**
+     * Returns the number of the first visible bar line
+     */
+    virtual int getLastVisibleBar() const;
+
+    /**
+     * Returns the x-coordinate of the given bar number
+     */
+    virtual double getBarPosition(int barNo) const;
+
+    /**
+     * Precomputes layout data for a single staff, updating any
+     * internal data stores associated with that staff and updating
+     * any layout-related properties in the events on the staff's
+     * segment.
+     */
+    virtual void scanStaff(Staff&,
+                           timeT = 0,
+                           timeT = 0);
+
+    /**
+     * Computes any layout data that may depend on the results of
+     * scanning more than one staff.  This may mean doing most of
+     * the layout (likely for horizontal layout) or nothing at all
+     * (likely for vertical layout).
+     */
+    virtual void finishLayout(timeT = 0,
+                              timeT = 0);
+
+    /**
+     * Returns true if there is a new time signature in the given bar,
+     * setting timeSignature appropriately and setting timeSigX to its
+     * x-coord
+     */
+    virtual bool getTimeSignaturePosition(Staff &staff,
+                                          int barNo,
+                                          TimeSignature &timeSig,
+                                          double &timeSigX);
+
+protected:
+
+    //--------------- Data members ---------------------------------
+
+    // pair of has-time-sig and time-sig
+    typedef std::pair<bool, TimeSignature> TimeSigData;
+    // pair of layout-x and time-signature if there is one
+    typedef std::pair<double, TimeSigData> BarData;
+    typedef FastVector<BarData> BarDataList;
+    BarDataList m_barData;
+    double m_totalWidth;
+    int m_firstBar;
+};
+
+/**
+ * "zoomable" version of the above, used in the MatrixView
+ * to properly scale Tempo and Chord rulers. 
+ * 
+ */
+class ZoomableMatrixHLayoutRulerScale : public RulerScale, public HZoomable {
+public:
+    ZoomableMatrixHLayoutRulerScale(MatrixHLayout& layout) : RulerScale(layout.getComposition()), m_referenceHLayout(layout) {};
+    
+    virtual double getBarPosition(int n)   const { return m_referenceHLayout.getBarPosition(n) * getHScaleFactor(); }
+    virtual double getXForTime(timeT time) const { return m_referenceHLayout.getXForTime(time) * getHScaleFactor(); }
+    virtual timeT getTimeForX(double x)    const { return m_referenceHLayout.getTimeForX(x / getHScaleFactor()); }
+    virtual double getBarWidth(int n)      const { return m_referenceHLayout.getBarWidth(n) * getHScaleFactor(); }
+    virtual int getLastVisibleBar()        const { return m_referenceHLayout.getLastVisibleBar(); }
+
+protected:
+    MatrixHLayout& m_referenceHLayout;    
+};
+
+}
+
+#endif