NAME¶

QwtKnob - The Knob Widget.

SYNOPSIS¶

#include <qwt_knob.h> Inherits QwtAbstractSlider, and QwtAbstractScale.

Public Types¶

enum KnobStyle { NoStyle = -1, Raised, Sunken } enum MarkerStyle { NoMarker = -1, Tick, Dot, Nub, Notch }

Public Member Functions¶

QwtKnob (QWidget *parent=NULL) virtual ~QwtKnob () void setKnobWidth (int w) int knobWidth () const void setTotalAngle (double angle) double totalAngle () const void setKnobStyle (KnobStyle) KnobStyle knobStyle () const void setBorderWidth (int bw) int borderWidth () const void setMarkerStyle (MarkerStyle) MarkerStyle markerStyle () const void setMarkerSize (int) int markerSize () const virtual QSize sizeHint () const virtual QSize minimumSizeHint () const void setScaleDraw (QwtRoundScaleDraw *) const QwtRoundScaleDraw * scaleDraw () const QwtRoundScaleDraw * scaleDraw ()

Protected Member Functions¶

virtual void paintEvent (QPaintEvent *) virtual void resizeEvent (QResizeEvent *) virtual void changeEvent (QEvent *) virtual void drawKnob (QPainter *, const QRectF &) const virtual void drawMarker (QPainter *, const QRectF &, double arc) const virtual double getValue (const QPoint &p) virtual void getScrollMode (const QPoint &, QwtAbstractSlider::ScrollMode &, int &direction) const

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. See also:

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: Enumerator:

NoStyle

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

enum QwtKnob::MarkerStyle¶

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

NoMarker

Don't paint any marker.

Tick

Paint a single tick 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¶

Parameters:

QwtKnob::~QwtKnob () [virtual]¶

Destructor.

Member Function Documentation¶

int QwtKnob::borderWidth () const¶

Return the border width.

void QwtKnob::changeEvent (QEvent *event) [protected, virtual] Handle QEvent::StyleChange and QEvent::FontChange;¶

Parameters:

void QwtKnob::drawKnob (QPainter *painter, const QRectF &knobRect) const [protected, virtual]¶

Draw the knob. Parameters:

void QwtKnob::drawMarker (QPainter *painter, const QRectF &rect, doubleangle) const [protected, virtual]¶

Draw the marker at the knob's front. Parameters:

void QwtKnob::getScrollMode (const QPoint &pos, QwtAbstractSlider::ScrollMode &scrollMode, int &direction) const [protected, virtual]¶

Set the scrolling mode and direction. Called by QwtAbstractSlider Parameters: Implements QwtAbstractSlider.

double QwtKnob::getValue (const QPoint &pos) [protected, virtual]¶

Determine the value corresponding to a specified position. Called by QwtAbstractSlider Parameters: Implements QwtAbstractSlider.

QwtKnob::KnobStyle QwtKnob::knobStyle () const Returns:¶

See also:

int QwtKnob::knobWidth () const¶

Return the width of the knob.

int QwtKnob::markerSize () const¶

Return the marker size.

QwtKnob::MarkerStyle QwtKnob::markerStyle () const Returns:¶

See also:

QSize QwtKnob::minimumSizeHint () const [virtual]¶

Return a minimum size hint. Warning:

void QwtKnob::paintEvent (QPaintEvent *event) [protected, virtual] Repaint the knob¶

Parameters:

void QwtKnob::resizeEvent (QResizeEvent *event) [protected, virtual] Qt Resize Event¶

Parameters:

QwtRoundScaleDraw * QwtKnob::scaleDraw () Returns:¶

See also:

const QwtRoundScaleDraw * QwtKnob::scaleDraw () const Returns:¶

See also:

void QwtKnob::setBorderWidth (intborderWidth)¶

Set the knob's border width. Parameters:

void QwtKnob::setKnobStyle (KnobStyleknobStyle)¶

Set the knob type. Parameters: See also:

void QwtKnob::setKnobWidth (intwidth)¶

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

void QwtKnob::setMarkerSize (intsize)¶

Set the size of the marker. See also:

void QwtKnob::setMarkerStyle (MarkerStylemarkerStyle)¶

Set the marker type of the knob. Parameters: See also:

void QwtKnob::setScaleDraw (QwtRoundScaleDraw *scaleDraw) 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:

void QwtKnob::setTotalAngle (doubleangle)¶

Set the total angle by which the knob can be turned. Parameters: 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:¶

double QwtKnob::totalAngle () const¶

Return the total angle.

Author¶

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