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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"
#include "qwt_abstract_scale.h"
class QwtRoundScaleDraw;
/*!
\brief The Knob Widget
The QwtKnob widget imitates look and behaviour of a volume knob on a radio.
It contains a scale around the knob which is set up automatically or can
be configured manually (see QwtAbstractScale).
Automatic scrolling is enabled when the user presses a mouse
button on the scale. For a description of signals, slots and other
members, see QwtAbstractSlider.
\image html knob.png
\sa QwtAbstractSlider and QwtAbstractScale for the descriptions
of the inherited members.
*/
class QWT_EXPORT QwtKnob : public QwtAbstractSlider, public QwtAbstractScale
{
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Q_ENUMS (Symbol)
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( Symbol symbol READ symbol WRITE setSymbol )
public:
/*!
Symbol
\sa QwtKnob::QwtKnob()
*/
enum Symbol { Line, Dot };
explicit QwtKnob(QWidget* parent = NULL);
#if QT_VERSION < 0x040000
explicit QwtKnob(QWidget* parent, const char *name);
#endif
virtual ~QwtKnob();
void setKnobWidth(int w);
int knobWidth() const;
void setTotalAngle (double angle);
double totalAngle() const;
void setBorderWidth(int bw);
int borderWidth() const;
void setSymbol(Symbol);
Symbol symbol() const;
virtual QSize sizeHint() const;
virtual QSize minimumSizeHint() const;
void setScaleDraw(QwtRoundScaleDraw *);
const QwtRoundScaleDraw *scaleDraw() const;
QwtRoundScaleDraw *scaleDraw();
protected:
virtual void paintEvent(QPaintEvent *e);
virtual void resizeEvent(QResizeEvent *e);
void draw(QPainter *p, const QRect& ur);
void drawKnob(QPainter *p, const QRect &r);
void drawMarker(QPainter *p, double arc, const QColor &c);
private:
void initKnob();
void layoutKnob( bool update = true );
double getValue(const QPoint &p);
void getScrollMode( const QPoint &p, int &scrollMode, int &direction );
void recalcAngle();