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diff --git a/muse_qt4_evolution/awl/aslider.h b/muse_qt4_evolution/awl/aslider.h
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+//=============================================================================
+//  Awl
+//  Audio Widget Library
+//  $Id:$
+//
+//  Copyright (C) 2002-2006 by Werner Schweer and others
+//
+//  This program is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License version 2.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//=============================================================================
+
+#ifndef __AWLASLIDER_H__
+#define __AWLASLIDER_H__
+
+namespace Awl {
+
+//---------------------------------------------------------
+//    AbstractSlider
+//
+//!   The AwlAbstractSlider class provides an double value
+//!   within a range
+//
+//!   The class is designed as a common super class for
+//!   widgets like AwlKnob and AwlSlider
+//!
+//---------------------------------------------------------
+
+class AbstractSlider : public QWidget {
+
+      Q_OBJECT
+      Q_PROPERTY(double value READ value WRITE setValue)
+      Q_PROPERTY(bool center READ center WRITE setCenter)
+      Q_PROPERTY(bool invertedAppearance READ invertedAppearance WRITE setInvertedAppearance)
+
+      Q_PROPERTY(int scaleWidth READ scaleWidth WRITE setScaleWidth)
+      Q_PROPERTY(QColor scaleColor READ scaleColor WRITE setScaleColor)
+      Q_PROPERTY(QColor scaleValueColor READ scaleValueColor WRITE setScaleValueColor)
+
+      Q_PROPERTY(int id READ id WRITE setId)
+
+      Q_PROPERTY(double minValue READ minValue WRITE setMinValue)
+      Q_PROPERTY(double maxValue READ maxValue WRITE setMaxValue)
+      Q_PROPERTY(double lineStep READ lineStep WRITE setLineStep)
+      Q_PROPERTY(double pageStep READ pageStep WRITE setPageStep)
+      Q_PROPERTY(bool   log      READ log      WRITE setLog)
+      Q_PROPERTY(bool   integer  READ integer  WRITE setInteger)
+
+   protected:
+      int _id;
+      double _value;
+      double _minValue, _maxValue, _lineStep, _pageStep;
+      bool _center;
+      bool _invert;
+      int _scaleWidth;        //! scale line width
+      QColor _scaleColor;
+      QColor _scaleValueColor;
+      bool _log;
+      bool _integer;
+
+      virtual void wheelEvent(QWheelEvent*);
+      virtual void keyPressEvent(QKeyEvent*);
+      virtual void valueChange();
+
+   signals:
+      void valueChanged(double, int);
+
+   public slots:
+      virtual void setValue(double v);
+
+   public:
+      AbstractSlider(QWidget* parent = 0);
+
+      virtual void setCenter(bool val);
+      virtual void setScaleWidth(int);
+      virtual void setScaleColor(const QColor&);
+      virtual void setScaleValueColor(const QColor&);
+
+      //! return the center flag
+      bool center() const            { return _center; }
+
+      //! return the scale line width
+      int scaleWidth() const         { return _scaleWidth; }
+
+      //! return current scale color
+      QColor scaleColor() const      { return _scaleColor; }
+
+      //! return color of active scale part
+      QColor scaleValueColor() const { return _scaleValueColor; }
+
+      virtual void setInvertedAppearance(bool val) { _invert = val; }
+      bool invertedAppearance() const              { return _invert; }
+
+      int id() const { return _id; }
+      void setId(int i) { _id = i; }
+
+      virtual double value() const;
+
+      double minValue() const { return _minValue; }
+      void setMinValue(double v) { _minValue = v; }
+      void setMinLogValue(double v);
+      double maxValue() const {return _maxValue; }
+      void setMaxValue(double v) { _maxValue = v; }
+      void setMaxLogValue(double v);
+      void setRange(double a, double b) {
+            setMinValue(a);
+            setMaxValue(b);
+            }
+      void setLogRange(double a, double b) {
+            setMinLogValue(a);
+            setMaxLogValue(b);
+            }
+      bool log() const           { return _log;      }
+      void setLog(bool v)        { _log = v;         }
+      bool integer() const       { return _integer;  }
+      void setInteger(bool v)    { _integer = v;     }
+      double lineStep() const    { return _lineStep; }
+      void setLineStep(double v) { _lineStep = v;    }
+      double pageStep() const    { return _pageStep; }
+      void setPageStep(double f) { _pageStep = f;    }
+      void setEnabled(bool val);
+      };
+
+}
+
+#endif
+