qwt_knob.h

/* -*- 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"
#include "qwt_abstract_scale.h"

class QwtRoundScaleDraw;

class QWT_EXPORT QwtKnob : public QwtAbstractSlider, public QwtAbstractScale
{
    Q_OBJECT

    Q_ENUMS ( KnobStyle )
    Q_ENUMS ( MarkerStyle )

    Q_PROPERTY( KnobStyle knobStyle READ knobStyle WRITE setKnobStyle )
    Q_PROPERTY( MarkerStyle markerStyle READ markerStyle WRITE setMarkerStyle )
    Q_PROPERTY( int knobWidth READ knobWidth WRITE setKnobWidth )
    Q_PROPERTY( int borderWidth READ borderWidth WRITE setBorderWidth )
    Q_PROPERTY( double totalAngle READ totalAngle WRITE setTotalAngle )
    Q_PROPERTY( int markerSize READ markerSize WRITE setMarkerSize )
    Q_PROPERTY( int borderWidth READ borderWidth WRITE setBorderWidth )

public:
    enum KnobStyle
    {
        NoStyle = -1,

        Raised,

        Sunken
    };

    enum MarkerStyle 
    { 
        NoMarker = -1,

        Tick, 

        Dot, 

        Nub, 

        Notch 
    };

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

    void setKnobWidth( int w );
    int knobWidth() 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();

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

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

    virtual double getValue( const QPoint &p );
    virtual void getScrollMode( const QPoint &, 
        QwtAbstractSlider::ScrollMode &, int &direction ) const;

private:
    void initKnob();
    void layoutKnob( bool update );
    void recalcAngle();

    virtual void valueChange();
    virtual void rangeChange();
    virtual void scaleChange();

    class PrivateData;
    PrivateData *d_data;
};

#endif