qwt_knob.h

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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_KNOB_H
#define QWT_KNOB_H

#include "qwt_global.h"
#include "qwt_abstract_slider.h"

class QwtRoundScaleDraw;

class QWT_EXPORT QwtKnob: public QwtAbstractSlider
{
    Q_OBJECT

    Q_ENUMS ( KnobStyle MarkerStyle )

    Q_PROPERTY( KnobStyle knobStyle READ knobStyle WRITE setKnobStyle )
    Q_PROPERTY( int knobWidth READ knobWidth WRITE setKnobWidth )
    Q_PROPERTY( Qt::Alignment alignment READ alignment WRITE setAlignment )
    Q_PROPERTY( double totalAngle READ totalAngle WRITE setTotalAngle )
    Q_PROPERTY( int numTurns READ numTurns WRITE setNumTurns )
    Q_PROPERTY( MarkerStyle markerStyle READ markerStyle WRITE setMarkerStyle )
    Q_PROPERTY( int markerSize READ markerSize WRITE setMarkerSize )
    Q_PROPERTY( int borderWidth READ borderWidth WRITE setBorderWidth )

public:
    enum KnobStyle
    {
        Flat,

        Raised,

        Sunken,

        Styled
    };

    enum MarkerStyle 
    { 
        NoMarker = -1,

        Tick, 

        Triangle, 

        Dot, 

        Nub, 

        Notch 
    };

    explicit QwtKnob( QWidget* parent = NULL );
    virtual ~QwtKnob();

    void setAlignment( Qt::Alignment );
    Qt::Alignment alignment() const;

    void setKnobWidth( int );
    int knobWidth() const;

    void setNumTurns( int );
    int numTurns() const;

    void setTotalAngle ( double angle );
    double totalAngle() const;

    void setKnobStyle( KnobStyle );
    KnobStyle knobStyle() const;

    void setBorderWidth( int bw );
    int borderWidth() const;

    void setMarkerStyle( MarkerStyle );
    MarkerStyle markerStyle() const;

    void setMarkerSize( int );
    int markerSize() const;

    virtual QSize sizeHint() const;
    virtual QSize minimumSizeHint() const;

    void setScaleDraw( QwtRoundScaleDraw * );

    const QwtRoundScaleDraw *scaleDraw() const;
    QwtRoundScaleDraw *scaleDraw();

    QRect knobRect() const;

protected:
    virtual void paintEvent( QPaintEvent * );
    virtual void changeEvent( QEvent * );

    virtual void drawKnob( QPainter *, const QRectF & ) const;

    virtual void drawFocusIndicator( QPainter * ) const;

    virtual void drawMarker( QPainter *, 
        const QRectF &, double arc ) const;

    virtual double scrolledTo( const QPoint & ) const;
    virtual bool isScrollPosition( const QPoint & ) const;

private:
    class PrivateData;
    PrivateData *d_data;
};

#endif