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diff --git a/src/gui/rulers/ControlItem.h b/src/gui/rulers/ControlItem.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.
+*/
+
+#include <qcanvas.h>
+
+namespace Rosegarden {
+
+class ControlRuler;
+class ElementAdapter;
+        
+class ControlItem : public QCanvasRectangle
+{
+public:
+    ControlItem(ControlRuler* controlRuler,
+                ElementAdapter* adapter,
+                int x, int width = DefaultWidth);
+
+    ~ControlItem();
+    
+    virtual void setValue(long);
+    int getValue() const { return m_value; }
+
+    void setWidth(int w)  { setSize(w, height()); }
+    void setHeight(int h) { setSize(width(), h); }
+    int getHeight()       { return size().height(); }
+
+    virtual void draw(QPainter &painter);
+
+    virtual void handleMouseButtonPress(QMouseEvent *e);
+    virtual void handleMouseButtonRelease(QMouseEvent *e);
+    virtual void handleMouseMove(QMouseEvent *e, int deltaX, int deltaY);
+    virtual void handleMouseWheel(QWheelEvent *e);
+
+    virtual void setSelected(bool yes);
+
+    /// recompute height according to represented value prior to a canvas repaint
+    virtual void updateFromValue();
+
+    /// update value according to height after a user edit
+    virtual void updateValue();
+
+    ElementAdapter* getElementAdapter() { return m_elementAdapter; }
+
+protected:
+
+    //--------------- Data members ---------------------------------
+
+    long m_value;
+    bool m_handlingMouseMove;
+
+    ControlRuler* m_controlRuler;
+    ElementAdapter* m_elementAdapter;
+
+    static const unsigned int BorderThickness;
+    static const unsigned int DefaultWidth;
+};
+
+}