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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_VUMETER_H_
+#define _RG_VUMETER_H_
+
+#include <qcolor.h>
+#include <qlabel.h>
+
+
+class QWidget;
+class QTimer;
+class QPaintEvent;
+class QPainter;
+
+
+namespace Rosegarden
+{
+
+class VelocityColour;
+
+
+class VUMeter : public QLabel
+{
+Q_OBJECT
+
+public:
+    typedef enum
+    {
+        Plain,
+        PeakHold,
+        AudioPeakHoldShort, 
+        AudioPeakHoldLong,
+        AudioPeakHoldIEC,
+        AudioPeakHoldIECLong,
+        FixedHeightVisiblePeakHold
+    } VUMeterType;
+
+    typedef enum
+    {
+        Horizontal,
+        Vertical
+    } VUAlignment;
+
+    // Mono and stereo level setting.  The AudioPeakHold meter types
+    // expect levels in dB; other types expect levels between 0 and 1.
+    //
+    void setLevel(double level);
+    void setLevel(double leftLevel, double rightLevel);
+
+    // Mono and stereo record level setting.  Same units.  Only
+    // applicable if hasRecord true in constructor.
+    //
+    void setRecordLevel(double level);
+    void setRecordLevel(double leftLevel, double rightLevel);
+
+    virtual void paintEvent(QPaintEvent*);
+
+protected:
+    // Constructor is protected - we can only create an object
+    // from a sub-class of this type from a sub-class.
+    //
+    VUMeter(QWidget *parent = 0,
+            VUMeterType type = Plain,
+            bool stereo = false,
+            bool hasRecord = false,
+            int width = 0,
+            int height = 0,
+            VUAlignment alignment = Horizontal,
+            const char *name = 0);
+    ~VUMeter();
+
+    virtual void meterStart() = 0;
+    virtual void meterStop() = 0;
+
+    int         m_originalHeight;
+    bool        m_active;
+
+    void setLevel(double leftLevel, double rightLevel, bool record);
+
+private slots:
+    void slotReduceLevelLeft();
+    void slotStopShowingPeakLeft();
+
+    void slotReduceLevelRight();
+    void slotStopShowingPeakRight();
+
+private:
+
+    void drawMeterLevel(QPainter *paint);
+    void drawColouredBar(QPainter *paint, int channel,
+                         int x, int y, int w, int h);
+
+    VUMeterType m_type;
+    VUAlignment m_alignment;
+    QColor      m_background;
+
+    short       m_maxLevel;
+
+    short       m_levelLeft;
+    short       m_recordLevelLeft;
+    short       m_peakLevelLeft;
+    short       m_levelStepLeft;
+    short       m_recordLevelStepLeft;
+    QTimer     *m_fallTimerLeft;
+    QTimer     *m_peakTimerLeft;
+
+    short       m_levelRight;
+    short       m_recordLevelRight;
+    short       m_peakLevelRight;
+    short       m_levelStepRight;
+    short       m_recordLevelStepRight;
+    QTimer     *m_fallTimerRight;
+    QTimer     *m_peakTimerRight;
+
+    bool        m_showPeakLevel;
+    short       m_baseLevelStep;
+
+    bool        m_stereo;
+    bool        m_hasRecord;
+
+    // We use this to work out our colours
+    //
+    VelocityColour *m_velocityColour;
+
+
+};
+
+
+}
+
+#endif