Man page - qwtknob(3)

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Manual

QwtKnob

NAME
SYNOPSIS
Public Types
Public Member Functions
Protected Member Functions
Additional Inherited Members
Detailed Description
Member Enumeration Documentation
enum QwtKnob::KnobStyle
enum QwtKnob::MarkerStyle
Constructor & Destructor Documentation
QwtKnob::QwtKnob (QWidget * parent = NULL) [explicit]
Member Function Documentation
Qt::Alignment QwtKnob::alignment () const
void QwtKnob::changeEvent (QEvent * event) [protected], [virtual]
void QwtKnob::drawFocusIndicator (QPainter * painter) const [protected],[virtual]
void QwtKnob::drawKnob (QPainter * painter, const QRectF & knobRect) const[protected], [virtual]
void QwtKnob::drawMarker (QPainter * painter, const QRectF & rect, doubleangle) const [protected], [virtual]
bool QwtKnob::isScrollPosition (const QPoint & pos) const [protected],[virtual]
QRect QwtKnob::knobRect () const
QwtKnob::KnobStyle QwtKnob::knobStyle () const
int QwtKnob::markerSize () const
QwtKnob::MarkerStyle QwtKnob::markerStyle () const
QSize QwtKnob::minimumSizeHint () const [virtual]
int QwtKnob::numTurns () const
void QwtKnob::paintEvent (QPaintEvent * event) [protected], [virtual]
const QwtRoundScaleDraw * QwtKnob::scaleDraw () const
QwtRoundScaleDraw * QwtKnob::scaleDraw ()
double QwtKnob::scrolledTo (const QPoint & pos) const [protected],[virtual]
void QwtKnob::setAlignment (Qt::Alignment alignment)
void QwtKnob::setBorderWidth (int borderWidth)
void QwtKnob::setKnobStyle (KnobStyle knobStyle)
void QwtKnob::setKnobWidth (int width)
void QwtKnob::setMarkerSize (int size)
void QwtKnob::setMarkerStyle (MarkerStyle markerStyle)
void QwtKnob::setNumTurns (int numTurns)
void QwtKnob::setScaleDraw (QwtRoundScaleDraw * scaleDraw)
void QwtKnob::setTotalAngle (double angle)
QSize QwtKnob::sizeHint () const [virtual]
double QwtKnob::totalAngle () const
Author

NAME

QwtKnob - The Knob Widget.

SYNOPSIS

#include <qwt_knob.h>

Inherits QwtAbstractSlider .

Public Types

enum KnobStyle { Flat , Raised , Sunken , Styled }
Style of the knob surface.
enum MarkerStyle { NoMarker = -1, Tick , Triangle , Dot , Nub , Notch }
Marker type.

Public Member Functions

QwtKnob (QWidget *parent=NULL)
Constructor.
virtual ˜QwtKnob ()
Destructor.
void setAlignment (Qt::Alignment)
Set the alignment of the knob.
Qt::Alignment alignment () const
void setKnobWidth (int)
Change the knob’s width.
int knobWidth () const
Return the width of the knob.
void setNumTurns (int)
Set the number of turns.
int numTurns () const
void setTotalAngle (double angle)
Set the total angle by which the knob can be turned.
double totalAngle () const
void setKnobStyle ( KnobStyle )
Set the knob type.
KnobStyle knobStyle () const
void setBorderWidth (int)
Set the knob’s border width.
int borderWidth () const
Return the border width.
void setMarkerStyle ( MarkerStyle )
Set the marker type of the knob.
MarkerStyle markerStyle () const
void setMarkerSize (int)
Set the size of the marker.
int markerSize () const
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
void setScaleDraw ( QwtRoundScaleDraw *)
const QwtRoundScaleDraw * scaleDraw () const
QwtRoundScaleDraw * scaleDraw ()
QRect knobRect () const

Protected Member Functions

virtual void paintEvent (QPaintEvent *)
virtual void changeEvent (QEvent *)
virtual void drawKnob (QPainter *, const QRectF &) const
Draw the knob.
virtual void drawFocusIndicator (QPainter *) const
virtual void drawMarker (QPainter *, const QRectF &, double angle) const
Draw the marker at the knob’s front.
virtual double scrolledTo (const QPoint &) const
Determine the value for a new position of the mouse.
virtual bool isScrollPosition (const QPoint &) const
Determine what to do when the user presses a mouse button.

Additional Inherited Members

Detailed Description

The Knob Widget.

The QwtKnob widget imitates look and behavior of a volume knob on a radio. It looks similar to QDial - not to QwtDial .

The value range of a knob might be divided into several turns.

The layout of the knob depends on the knobWidth() .

	•		width > 0 The diameter of the knob is fixed and the knob is aligned according to the alignment() flags inside of the contentsRect().
	•		width <= 0 The knob is extended to the minimum of width/height of the contentsRect() and aligned in the other direction according to alignment() .

Setting a fixed knobWidth() is helpful to align several knobs with different scale labels.

Member Enumeration Documentation

enum QwtKnob::KnobStyle

Style of the knob surface. Depending on the KnobStyle the surface of the knob is filled from the brushes of the widget palette().

See also:

setKnobStyle() , knobStyle()

Enumerator

	Flat		Fill the knob with a brush from QPalette::Button.
	Raised		Build a gradient from QPalette::Midlight and QPalette::Button.
	Sunken		Build a gradient from QPalette::Midlight, QPalette::Button and QPalette::Midlight
	Styled		Build a radial gradient from QPalette::Button like it is used for QDial in various Qt styles.

enum QwtKnob::MarkerStyle

Marker type. The marker indicates the current value on the knob The default setting is a Notch marker.

See also:

setMarkerStyle() , setMarkerSize()

Enumerator
NoMarker

Don’t paint any marker.

Tick

Paint a single tick in QPalette::ButtonText color.

Triangle

Paint a triangle in QPalette::ButtonText color.

	Dot		Paint a circle in QPalette::ButtonText color.
	Nub		Draw a raised ellipse with a gradient build from QPalette::Light and QPalette::Mid
	Notch		Draw a sunken ellipse with a gradient build from QPalette::Light and QPalette::Mid

Constructor & Destructor Documentation

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

Constructor. Construct a knob with an angle of 270°. The style is QwtKnob::Raised and the marker style is QwtKnob::Notch . The width of the knob is set to 50 pixels.

Parameters:

parent Parent widget

See also:

setTotalAngle()

Member Function Documentation

Qt::Alignment QwtKnob::alignment () const

Returns:

True,when pos is inside the circle of the knob.

See also:

scrolledTo()

Implements QwtAbstractSlider .

QRect QwtKnob::knobRect () const

Calculate the bounding rectangle of the knob without the scale

See also:

isScrollPosition()

Implements QwtAbstractSlider .

void QwtKnob::setAlignment (Qt::Alignment alignment)

Set the alignment of the knob. Similar to a QLabel::alignment() the flags decide how to align the knob inside of contentsRect().

The default setting is Qt::AlignCenter

Parameters:

alignment Or’d alignment flags

See also:

alignment() , setKnobWidth() , knobRect()

void QwtKnob::setBorderWidth (int borderWidth)

Set the knob’s border width.

Parameters:

borderWidth new border width

void QwtKnob::setKnobStyle (KnobStyle knobStyle)

Set the knob type.

Parameters:

knobStyle Knob type

See also:

knobStyle() , setBorderWidth()

void QwtKnob::setKnobWidth (int width)

Change the knob’s width. Setting a fixed value for the diameter of the knob is helpful for aligning several knobs in a row.

Parameters:

width New width

See also:

knobWidth() , setAlignment()

Note:

Change the scale draw of the knob

For changing the labels of the scales, it is necessary to derive from QwtRoundScaleDraw and overload QwtRoundScaleDraw::label() .

See also:

scaleDraw()

void QwtKnob::setTotalAngle (double angle)

Set the total angle by which the knob can be turned.

Parameters:

angle Angle in degrees.

The angle has to be between [10, 360] degrees. Angles above 360 ( so that the knob can be turned several times around its axis ) have to be set using setNumTurns() .

The default angle is 270 degrees.

See also:

totalAngle() , setNumTurns()

QSize QwtKnob::sizeHint () const [virtual]

Returns:

sizeHint()

double QwtKnob::totalAngle () const

Returns:

the total angle

See also:

setTotalAngle() , setNumTurns() , numTurns()

Author

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