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QwtKnob Class Reference

Inheritance diagram for QwtKnob:

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Collaboration diagram for QwtKnob:

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List of all members.

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 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.

knob.gif
See also:
QwtAbstractSlider and QwtAbstractScale for the descriptions of the inherited members.

Definition at line 32 of file qwt_knob.h.

Public Types

enum  Symbol {
  Line,
  Dot
}

Public Member Functions

 QwtKnob (QWidget *parent=NULL)
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

Protected Member Functions

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)


Member Enumeration Documentation

enum QwtKnob::Symbol
 

Symbol

See also:
QwtKnob::QwtKnob()

Definition at line 47 of file qwt_knob.h.


Constructor & Destructor Documentation

QwtKnob::QwtKnob QWidget *  parent = NULL  )  [explicit]
 

Constructor.

Parameters:
parent Parent widget
name Name

Definition at line 64 of file qwt_knob.cpp.

References QwtAbstractScale::scaleDraw(), QwtScaleDraw::setGeometry(), QwtDoubleRange::setRange(), setTotalAngle(), QwtAbstractSlider::setUpdateTime(), and QwtAbstractSlider::setValue().

QwtKnob::~QwtKnob  )  [virtual]
 

Destructor.

Definition at line 85 of file qwt_knob.cpp.


Member Function Documentation

int QwtKnob::borderWidth  )  const
 

Return the border width.

Definition at line 430 of file qwt_knob.cpp.

void QwtKnob::draw QPainter *  painter,
const QRect &  ur
[protected]
 

Repaint the knob.

Definition at line 337 of file qwt_knob.cpp.

References QwtScaleDraw::draw(), drawKnob(), and QwtAbstractScale::scaleDraw().

Referenced by paintEvent().

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

Draw the knob.

Parameters:
p painter
r borders of the knob

Definition at line 145 of file qwt_knob.cpp.

References drawMarker(), and QwtAbstractSlider::isValid().

Referenced by draw().

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

Definition at line 360 of file qwt_knob.cpp.

References QwtScaleDraw::x(), and QwtScaleDraw::y().

Referenced by drawKnob().

int QwtKnob::knobWidth  )  const
 

Return the width of the knob.

Definition at line 414 of file qwt_knob.cpp.

QSize QwtKnob::minimumSizeHint  )  const [virtual]
 

Return a minimum size hint.

Warning:
The return value of QwtKnob::minimumSizeHint() depends on the font and the scale.

Definition at line 493 of file qwt_knob.cpp.

References QwtScaleDraw::minHeight(), and QwtAbstractScale::scaleDraw().

Referenced by sizeHint().

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

Repaint the knob.

Definition at line 317 of file qwt_knob.cpp.

References draw(), and QwtPaintBuffer::painter().

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

Qt Resize Event.

Definition at line 283 of file qwt_knob.cpp.

void QwtKnob::setBorderWidth int  bw  ) 
 

Set the knob's border width.

Parameters:
bw new border width

Definition at line 423 of file qwt_knob.cpp.

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

Definition at line 407 of file qwt_knob.cpp.

void QwtKnob::setSymbol QwtKnob::Symbol  s  ) 
 

Set the symbol of the knob.

See also:
QwtKnob::symbol()

Definition at line 94 of file qwt_knob.cpp.

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.

Definition at line 120 of file qwt_knob.cpp.

References QwtAbstractScale::scaleDraw(), and QwtScaleDraw::setAngleRange().

Referenced by QwtKnob().

QSize QwtKnob::sizeHint  )  const [virtual]
 

Returns:
QwtKnob::minimumSizeHint()

Definition at line 483 of file qwt_knob.cpp.

References minimumSizeHint().

QwtKnob::Symbol QwtKnob::symbol  )  const
 

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

Definition at line 107 of file qwt_knob.cpp.

double QwtKnob::totalAngle  )  const
 

Return the total angle.

Definition at line 133 of file qwt_knob.cpp.


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