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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_ROSEGARDENFADER_H_
+#define _RG_ROSEGARDENFADER_H_
+
+#include "base/AudioLevel.h"
+#include <map>
+#include <qcolor.h>
+#include <qwidget.h>
+#include <utility>
+
+
+class QWheelEvent;
+class QTimer;
+class QPixmap;
+class QPaintEvent;
+class QMouseEvent;
+
+
+namespace Rosegarden
+{
+
+class TextFloat;
+
+
+class Fader : public QWidget
+{
+    Q_OBJECT
+
+public:
+    /**
+     * Construct a dB fader.  The fader calculates its orientation
+     * based on the given dimensions.
+     */
+    Fader(AudioLevel::FaderType,
+                    int width, int height, QWidget *parent);
+
+    /**
+     * Construct a fader on an integral scale.  The fader calculates
+     * its orientation based on the given dimensions.
+     */
+    Fader(int min, int max, int deflt,
+                    int width, int height, QWidget *parent);
+
+    /**
+     * Construct a fader on an integral scale, with a 1:1 ratio of
+     * pixel positions and values.
+     */
+    Fader(int min, int max, int deflt,
+                    bool vertical, QWidget *parent);
+
+    virtual ~Fader();
+    
+    void setOutlineColour(QColor);
+
+    float getFaderLevel() const;
+
+public slots:
+    void setFader(float value);
+    void slotFloatTimeout();
+
+signals:
+    void faderChanged(float);
+
+protected:
+    virtual void paintEvent(QPaintEvent *);
+    virtual void mousePressEvent(QMouseEvent *);
+    virtual void mouseReleaseEvent(QMouseEvent *);
+    virtual void mouseMoveEvent(QMouseEvent *);
+    virtual void wheelEvent(QWheelEvent *);
+
+    float position_to_value(int);
+    int value_to_position(float);
+
+    void calculateGroovePixmap();
+    void calculateButtonPixmap();
+    void showFloatText();
+
+    bool m_integral;
+    bool m_vertical;
+
+    int m_sliderMin;
+    int m_sliderMax;
+    float m_value;
+
+    int m_min;
+    int m_max;
+    AudioLevel::FaderType m_type;
+
+    int m_clickMousePos;
+    int m_clickButtonPos;
+
+    TextFloat *m_float;
+    QTimer              *m_floatTimer;
+
+    QPixmap *groovePixmap();
+    QPixmap *buttonPixmap();
+
+    QColor m_outlineColour;
+
+    typedef std::pair<int, int> SizeRec;
+    typedef std::map<unsigned int, QPixmap *> ColourPixmapRec; // key is QColor::pixel()
+    typedef std::pair<ColourPixmapRec, QPixmap *> PixmapRec;
+    typedef std::map<SizeRec, PixmapRec> PixmapCache;
+    static PixmapCache m_pixmapCache;
+};
+
+
+// AudioVUMeter - a vertical audio meter.  Default is stereo.
+//
+
+}
+
+#endif