qwt_dial.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_DIAL_H
#define QWT_DIAL_H 1
 
#include "qwt_global.h"
#include "qwt_abstract_slider.h"
#include "qwt_abstract_scale_draw.h"
#include <qframe.h>
#include <qpalette.h>
 
class QwtDialNeedle;
class QwtRoundScaleDraw;
 
class QWT_EXPORT QwtDial: public QwtAbstractSlider
{
    Q_OBJECT
 
    Q_ENUMS( Shadow Mode Direction )
 
    Q_PROPERTY( int lineWidth READ lineWidth WRITE setLineWidth )
    Q_PROPERTY( Shadow frameShadow READ frameShadow WRITE setFrameShadow )
    Q_PROPERTY( Mode mode READ mode WRITE setMode )
    Q_PROPERTY( double origin READ origin WRITE setOrigin )
    Q_PROPERTY( double minScaleArc READ minScaleArc WRITE setMinScaleArc )
    Q_PROPERTY( double maxScaleArc READ maxScaleArc WRITE setMaxScaleArc )
 
public:
 
    enum Shadow
    {
        Plain = QFrame::Plain,
 
        Raised = QFrame::Raised,
 
        Sunken = QFrame::Sunken
    };
 
    enum Mode
    {
        RotateNeedle,
 
        RotateScale
    };
 
    explicit QwtDial( QWidget *parent = NULL );
    virtual ~QwtDial();
 
    void setFrameShadow( Shadow );
    Shadow frameShadow() const;
 
    void setLineWidth( int );
    int lineWidth() const;
 
    void setMode( Mode );
    Mode mode() const;
 
    void setScaleArc( double minArc, double maxArc );
 
    void setMinScaleArc( double );
    double minScaleArc() const;
 
    void setMaxScaleArc( double );
    double maxScaleArc() const;
 
    virtual void setOrigin( double );
    double origin() const;
 
    void setNeedle( QwtDialNeedle * );
    const QwtDialNeedle *needle() const;
    QwtDialNeedle *needle();
 
    QRect boundingRect() const;
    QRect innerRect() const;
 
    virtual QRect scaleInnerRect() const;
 
    virtual QSize sizeHint() const;
    virtual QSize minimumSizeHint() const;
 
    void setScaleDraw( QwtRoundScaleDraw * );
 
    QwtRoundScaleDraw *scaleDraw();
    const QwtRoundScaleDraw *scaleDraw() const;
 
protected:
    virtual void wheelEvent( QWheelEvent * );
    virtual void paintEvent( QPaintEvent * );
    virtual void changeEvent( QEvent * );
 
    virtual void drawFrame( QPainter * );
    virtual void drawContents( QPainter * ) const;
    virtual void drawFocusIndicator( QPainter * ) const;
 
    void invalidateCache();
 
    virtual void drawScale( QPainter *,
        const QPointF &center, double radius ) const;
 
    virtual void drawScaleContents( QPainter *painter,
        const QPointF &center, double radius ) const;
 
    virtual void drawNeedle( QPainter *, const QPointF &,
        double radius, double direction, QPalette::ColorGroup ) const;
 
    virtual double scrolledTo( const QPoint & ) const;
    virtual bool isScrollPosition( const QPoint & ) const;
 
    virtual void sliderChange();
    virtual void scaleChange();
 
private:
    void setAngleRange( double angle, double span );
    void drawNeedle( QPainter * ) const;
 
    class PrivateData;
    PrivateData *d_data;
};
 
#endif