Qwt User's Guide
6.0.2
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#include <qwt_knob.h>
Public Types | |
enum | KnobStyle { NoStyle = -1, Raised, Sunken } |
enum | MarkerStyle { NoMarker = -1, Tick, Dot, Nub, Notch } |
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enum | ScrollMode { ScrNone, ScrMouse, ScrTimer, ScrDirect, ScrPage } |
Public Member Functions | |
QwtKnob (QWidget *parent=NULL) | |
virtual | ~QwtKnob () |
int | borderWidth () const |
KnobStyle | knobStyle () const |
int | knobWidth () const |
int | markerSize () const |
MarkerStyle | markerStyle () const |
virtual QSize | minimumSizeHint () const |
const QwtRoundScaleDraw * | scaleDraw () const |
QwtRoundScaleDraw * | scaleDraw () |
void | setBorderWidth (int bw) |
void | setKnobStyle (KnobStyle) |
void | setKnobWidth (int w) |
void | setMarkerSize (int) |
void | setMarkerStyle (MarkerStyle) |
void | setScaleDraw (QwtRoundScaleDraw *) |
void | setTotalAngle (double angle) |
virtual QSize | sizeHint () const |
double | totalAngle () const |
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QwtAbstractSlider (Qt::Orientation, QWidget *parent=NULL) | |
virtual | ~QwtAbstractSlider () |
bool | isReadOnly () const |
bool | isValid () const |
virtual double | mass () const |
Qt::Orientation | orientation () const |
virtual void | setMass (double val) |
virtual void | setOrientation (Qt::Orientation o) |
void | setTracking (bool enable) |
void | setUpdateTime (int t) |
void | setValid (bool valid) |
void | stopMoving () |
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QwtDoubleRange () | |
virtual | ~QwtDoubleRange () |
virtual void | incPages (int) |
double | maxValue () const |
double | minValue () const |
int | pageSize () const |
bool | periodic () const |
void | setPeriodic (bool tf) |
void | setRange (double vmin, double vmax, double vstep=0.0, int pagesize=1) |
void | setStep (double) |
double | step () const |
double | value () const |
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QwtAbstractScale () | |
virtual | ~QwtAbstractScale () |
bool | autoScale () const |
const QwtScaleEngine * | scaleEngine () const |
QwtScaleEngine * | scaleEngine () |
const QwtScaleMap & | scaleMap () const |
int | scaleMaxMajor () const |
int | scaleMaxMinor () const |
void | setAutoScale () |
void | setScale (double vmin, double vmax, double step=0.0) |
void | setScale (const QwtInterval &, double step=0.0) |
void | setScale (const QwtScaleDiv &) |
void | setScaleEngine (QwtScaleEngine *) |
void | setScaleMaxMajor (int ticks) |
void | setScaleMaxMinor (int ticks) |
Protected Member Functions | |
virtual void | changeEvent (QEvent *) |
virtual void | drawKnob (QPainter *, const QRectF &) const |
virtual void | drawMarker (QPainter *, const QRectF &, double arc) const |
virtual void | getScrollMode (const QPoint &, QwtAbstractSlider::ScrollMode &, int &direction) const |
virtual double | getValue (const QPoint &p) |
virtual void | paintEvent (QPaintEvent *) |
virtual void | resizeEvent (QResizeEvent *) |
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virtual void | keyPressEvent (QKeyEvent *e) |
virtual void | mouseMoveEvent (QMouseEvent *e) |
double | mouseOffset () const |
virtual void | mousePressEvent (QMouseEvent *e) |
virtual void | mouseReleaseEvent (QMouseEvent *e) |
int | scrollMode () const |
void | setMouseOffset (double) |
virtual void | setPosition (const QPoint &) |
virtual void | timerEvent (QTimerEvent *e) |
virtual void | wheelEvent (QWheelEvent *e) |
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double | exactPrevValue () const |
double | exactValue () const |
double | prevValue () const |
virtual void | stepChange () |
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const QwtAbstractScaleDraw * | abstractScaleDraw () const |
QwtAbstractScaleDraw * | abstractScaleDraw () |
void | rescale (double vmin, double vmax, double step=0.0) |
void | setAbstractScaleDraw (QwtAbstractScaleDraw *) |
Additional Inherited Members | |
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virtual void | fitValue (double val) |
virtual void | incValue (int steps) |
virtual void | setReadOnly (bool) |
virtual void | setValue (double val) |
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void | sliderMoved (double value) |
void | sliderPressed () |
void | sliderReleased () |
void | valueChanged (double value) |
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.
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().
enum QwtKnob::MarkerStyle |
Marker type.
The marker indicates the current value on the knob The default setting is a Notch marker.
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explicit |
Constructor
parent | Parent widget |
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protectedvirtual |
Handle QEvent::StyleChange and QEvent::FontChange;
event | Change event |
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protectedvirtual |
Draw the knob.
painter | painter |
knobRect | Bounding rectangle of the knob (without scale) |
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protectedvirtual |
Draw the marker at the knob's front.
painter | Painter |
rect | Bounding rectangle of the knob without scale |
angle | Angle of the marker in degrees |
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protectedvirtual |
Set the scrolling mode and direction.
Called by QwtAbstractSlider
pos | Point in question |
scrollMode | Scrolling mode |
direction | Direction |
Implements QwtAbstractSlider.
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protectedvirtual |
Determine the value corresponding to a specified position.
Called by QwtAbstractSlider
pos | point |
Implements QwtAbstractSlider.
QwtKnob::KnobStyle QwtKnob::knobStyle | ( | ) | const |
QwtKnob::MarkerStyle QwtKnob::markerStyle | ( | ) | const |
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virtual |
Return a minimum size hint.
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protectedvirtual |
Repaint the knob
event | Paint event |
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protectedvirtual |
Qt Resize Event
event | Resize event |
const QwtRoundScaleDraw * QwtKnob::scaleDraw | ( | ) | const |
QwtRoundScaleDraw * QwtKnob::scaleDraw | ( | ) |
void QwtKnob::setBorderWidth | ( | int | borderWidth | ) |
Set the knob's border width.
borderWidth | new border width |
void QwtKnob::setKnobStyle | ( | KnobStyle | knobStyle | ) |
void QwtKnob::setKnobWidth | ( | int | width | ) |
Change the knob's width.
The specified width must be >= 5, or it will be clipped.
width | New width |
void QwtKnob::setMarkerSize | ( | int | size | ) |
Set the size of the marker.
void QwtKnob::setMarkerStyle | ( | MarkerStyle | markerStyle | ) |
Set the marker type of the knob.
markerStyle | Marker type |
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().
void QwtKnob::setTotalAngle | ( | double | angle | ) |
Set the total angle by which the knob can be turned.
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.
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virtual |