---

QwtKnob Class Reference

The Knob Widget. More...

#include <qwt_knob.h>

Inheritance diagram for QwtKnob::

List of all members.

Public Types
enum	Symbol { Line, Dot }
Public Methods
	QwtKnob (QWidget *parent=0, const char *name=0)
virtual	~QwtKnob ()
void	setKnobWidth (int w)
void	setTotalAngle (double angle)
void	setBorderWidth (int bw)
void	setSymbol (Symbol)
Symbol	symbol () const
virtual QSize	sizeHint () const
virtual QSize	minimumSizeHint () const
virtual QSizePolicy	sizePolicy () const
Protected Methods
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)

---

Detailed Description

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 QwtScaleIf). Automatic scrolling is enabled when the user presses a mouse button on the scale. For a description of signals, slots and other members, see QwtSliderBase.

See also:

QwtSliderBase and QwtScaleIf for the descriptions of the inherited members.

---

Member Enumeration Documentation

enum QwtKnob::Symbol

Symbol See also: QwtKnob::QwtKnob()

---

Constructor & Destructor Documentation

QwtKnob::QwtKnob (  QWidget *    parent = 0, const char *    name = 0 )

Constructor. Parameters: parent  Parent widget name  Name

QwtKnob::~QwtKnob (    )  [virtual]

Destructor.

---

Member Function Documentation

void QwtKnob::draw (  QPainter *    p, const QRect &    ur )  [protected]

Repaint the knob.

void QwtKnob::drawKnob (  QPainter *    p, const QRect &    r )  [protected]

Draw the knob. Parameters: p  painter r  borders of the knob

void QwtKnob::drawMarker (  QPainter *    p, double    arc, const QColor &    c )  [protected]

Draw the marker at the knob's front. Parameters: p  Painter arc  Angle of the marker c  Marker color

QSize QwtKnob::minimumSizeHint (    )  const [virtual]

Return a minimum size hint. Warning: The return value of QwtKnob::minimumSizeHint() depends on the font and the scale.

void QwtKnob::paintEvent (  QPaintEvent *    e )  [protected, virtual]

Repaint the knob.

void QwtKnob::resizeEvent (  QResizeEvent *    e )  [protected, virtual]

Qt Resize Event.

void QwtKnob::setBorderWidth (  int    bw )

Set the knob's border width. Parameters: bw  new border width

void QwtKnob::setKnobWidth (  int    w )

Change the knob's width. The specified width must be >= 5, or it will be clipped. Parameters: w  New width

void QwtKnob::setSymbol (  QwtKnob::Symbol    s )

Set the symbol of the knob. See also: QwtKnob::symbol()

void QwtKnob::setTotalAngle (  double    angle )

Set the total angle by which the knob can be turned. Parameters: angle  Angle in degrees. The default angle is 270 degrees. It is possible to specify an angle of more than 360 degrees so that the knob can be turned several times around its axis.

QSize QwtKnob::sizeHint (    )  const [virtual]

Returns: QwtKnob::minimumSizeHint()

QSizePolicy QwtKnob::sizePolicy (    )  const [virtual]

Returns: Fixed/Fixed.

QwtKnob::Symbol QwtKnob::symbol (    )  const

Returns: symbol of the knob See also: QwtKnob::setSymbol()

---