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diff --git a/src/gui/rulers/ControlRuler.h b/src/gui/rulers/ControlRuler.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_CONTROLRULER_H_
+#define _RG_CONTROLRULER_H_
+
+#include "base/Segment.h"
+#include "gui/general/RosegardenCanvasView.h"
+#include <qcolor.h>
+#include <qpoint.h>
+#include <qstring.h>
+#include <utility>
+
+
+class QWidget;
+class QWheelEvent;
+class QScrollBar;
+class QPopupMenu;
+class QMouseEvent;
+class QContextMenuEvent;
+class QCanvasRectangle;
+class QCanvas;
+
+
+namespace Rosegarden
+{
+
+class ControlTool;
+class ControlSelector;
+class ControlItem;
+class TextFloat;
+class Segment;
+class RulerScale;
+class EventSelection;
+class EditViewBase;
+
+
+/**
+ * ControlRuler : base class for Control Rulers
+ */
+class ControlRuler : public RosegardenCanvasView, public SegmentObserver
+{
+    Q_OBJECT
+
+    friend class ControlItem;
+
+public:
+    ControlRuler(Segment*,
+                 RulerScale*,
+                 EditViewBase* parentView,
+                 QCanvas*,
+                 QWidget* parent=0, const char* name=0, WFlags f=0);
+    virtual ~ControlRuler();
+
+    virtual QString getName() = 0;
+
+    int getMaxItemValue() { return m_maxItemValue; }
+    void setMaxItemValue(int val) { m_maxItemValue = val; }
+
+    void clear();
+
+    void setControlTool(ControlTool*);
+
+    int applyTool(double x, int val);
+
+    QCanvasRectangle* getSelectionRectangle() { return m_selectionRect; }
+
+    RulerScale* getRulerScale() { return m_rulerScale; }
+
+    // SegmentObserver interface
+    virtual void segmentDeleted(const Segment *);
+
+    static const int DefaultRulerHeight;
+    static const int MinItemHeight;
+    static const int MaxItemHeight;
+    static const int ItemHeightRange;
+
+    void flipForwards();
+    void flipBackwards();
+
+    void setMainHorizontalScrollBar(QScrollBar* s ) { m_mainHorizontalScrollBar = s; }
+
+signals:
+    void stateChange(const QString&, bool);
+
+public slots:
+    /// override RosegardenCanvasView - we don't want to change the main hscrollbar
+    virtual void slotUpdate();
+    virtual void slotUpdateElementsHPos();
+    
+protected:
+    virtual void contentsMousePressEvent(QMouseEvent*);
+    virtual void contentsMouseReleaseEvent(QMouseEvent*);
+    virtual void contentsMouseMoveEvent(QMouseEvent*);
+    virtual void contentsWheelEvent(QWheelEvent*);
+    virtual void contentsContextMenuEvent(QContextMenuEvent*);
+
+    virtual QScrollBar* getMainHorizontalScrollBar();
+
+    virtual void computeStaffOffset() {};
+
+    virtual void layoutItem(ControlItem*);
+
+
+
+    // Stacking of the SegmentItems on the canvas
+    //
+    std::pair<int, int> getZMinMax();
+
+    virtual void init() = 0;
+    virtual void drawBackground() = 0;
+
+    int valueToHeight(long val);
+    long heightToValue(int height);
+    QColor valueToColour(int max, int val);
+
+    void clearSelectedItems();
+    void updateSelection();
+
+    void setMenuName(QString menuName) { m_menuName = menuName; }
+    void createMenu();
+
+    //--------------- Data members ---------------------------------
+
+    EditViewBase*               m_parentEditView;
+    QScrollBar*                 m_mainHorizontalScrollBar;
+    RulerScale*     m_rulerScale;
+    EventSelection* m_eventSelection;
+    Segment*        m_segment;
+
+    ControlItem* m_currentItem;
+    QCanvasItemList m_selectedItems;
+
+    ControlTool *m_tool;
+
+    int m_maxItemValue;
+
+    double m_staffOffset;
+
+    double m_currentX;
+
+    QPoint m_lastEventPos;
+    bool m_itemMoved;
+
+    bool m_selecting;
+    ControlSelector* m_selector;
+    QCanvasRectangle* m_selectionRect;
+
+    QString m_menuName;
+    QPopupMenu* m_menu;
+
+    TextFloat  *m_numberFloat;
+
+    bool m_hposUpdatePending;
+};
+
+
+}
+
+#endif