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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_CHORDNAMERULER_H_
+#define _RG_CHORDNAMERULER_H_
+
+#include "base/PropertyName.h"
+#include <map>
+#include <qfont.h>
+#include <qfontmetrics.h>
+#include <qsize.h>
+#include <qwidget.h>
+#include <vector>
+#include "base/Event.h"
+
+
+class QPaintEvent;
+
+
+namespace Rosegarden
+{
+
+class Studio;
+class Segment;
+class RulerScale;
+class RosegardenGUIDoc;
+class Composition;
+
+
+/**
+ * ChordNameRuler is a widget that shows a strip of text strings
+ * describing the chords in a composition.
+ */
+
+class ChordNameRuler : public QWidget
+{
+    Q_OBJECT
+
+public:
+    /**
+     * Construct a ChordNameRuler that displays the chords in the
+     * given Composition at positions calculated by the given
+     * RulerScale.  Be aware that it will not be refreshed until
+     * setReady is called (because the first refresh is expensive).
+     */
+    ChordNameRuler(RulerScale *rulerScale,
+                   RosegardenGUIDoc *doc,
+                   double xorigin = 0.0,
+                   int height = 0,
+                   QWidget* parent = 0,
+                   const char *name = 0);
+
+    /**
+     * Construct a ChordNameRuler that displays the chords in the
+     * given Segments at positions calculated by the given
+     * RulerScale.  Be aware that it will not be refreshed until
+     * setReady is called (because the first refresh is expensive).
+     */
+    ChordNameRuler(RulerScale *rulerScale,
+                   RosegardenGUIDoc *doc,
+                   std::vector<Segment *> &segments,
+                   double xorigin = 0.0,
+                   int height = 0,
+                   QWidget* parent = 0,
+                   const char *name = 0);
+
+    ~ChordNameRuler();
+
+    /// Indicate that the chord-name ruler should make itself ready and refresh
+    void setReady();
+
+    // may have one of these; can be changed at any time (to any in given composition):
+    void setCurrentSegment(Segment *segment);
+
+    // may have one of these (to avoid using percussion tracks in chords):
+    void setStudio(Studio *studio);
+
+    virtual QSize sizeHint() const;
+    virtual QSize minimumSizeHint() const;
+
+    void setMinimumWidth(int width) { m_width = width; }
+
+public slots:
+    void slotScrollHoriz(int x);
+
+protected:
+    virtual void paintEvent(QPaintEvent *);
+
+private:
+    void recalculate(timeT from = 0,
+                     timeT to = 0);
+
+    double m_xorigin;
+    int    m_height;
+    int    m_currentXOffset;
+    int    m_width;
+    bool   m_ready;
+
+    RulerScale  *m_rulerScale;
+
+    Composition *m_composition;
+    unsigned int m_compositionRefreshStatusId;
+
+    typedef std::map<Segment *, int> SegmentRefreshMap;
+    SegmentRefreshMap m_segments; // map to refresh status id
+    bool m_regetSegmentsOnChange;
+
+    Segment *m_currentSegment;
+    Studio *m_studio;
+
+    Segment *m_chordSegment;
+
+    QFont m_font;
+    QFont m_boldFont;
+    QFontMetrics m_fontMetrics;
+
+    const PropertyName TEXT_FORMAL_X;
+    const PropertyName TEXT_ACTUAL_X;
+};
+
+
+}
+
+#endif