Qwt User's Guide  6.0.2
Public Slots | Public Member Functions | Protected Member Functions
QwtWheel Class Reference

#include <qwt_wheel.h>

Inheritance diagram for QwtWheel:
Inheritance graph
[legend]

List of all members.

Public Slots

void setTotalAngle (double)
void setViewAngle (double)
- Public Slots inherited from QwtAbstractSlider
virtual void fitValue (double val)
virtual void incValue (int steps)
virtual void setReadOnly (bool)
virtual void setValue (double val)

Public Member Functions

 QwtWheel (QWidget *parent=NULL)
virtual ~QwtWheel ()
int borderWidth () const
double mass () const
virtual QSize minimumSizeHint () const
void setBorderWidth (int)
void setMass (double)
virtual void setOrientation (Qt::Orientation)
void setTickCnt (int)
void setWheelBorderWidth (int)
void setWheelWidth (int)
virtual QSize sizeHint () const
int tickCnt () const
double totalAngle () const
double viewAngle () const
int wheelBorderWidth () const
QRect wheelRect () const
int wheelWidth () const
- Public Member Functions inherited from QwtAbstractSlider
 QwtAbstractSlider (Qt::Orientation, QWidget *parent=NULL)
virtual ~QwtAbstractSlider ()
bool isReadOnly () const
bool isValid () const
Qt::Orientation orientation () const
void setTracking (bool enable)
void setUpdateTime (int t)
void setValid (bool valid)
void stopMoving ()
- Public Member Functions inherited from QwtDoubleRange
 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

Protected Member Functions

virtual void drawTicks (QPainter *, const QRectF &)
virtual void drawWheelBackground (QPainter *, const QRectF &)
virtual void getScrollMode (const QPoint &, QwtAbstractSlider::ScrollMode &, int &direction) const
virtual double getValue (const QPoint &)
virtual void paintEvent (QPaintEvent *)
virtual void resizeEvent (QResizeEvent *)
virtual void valueChange ()
- Protected Member Functions inherited from QwtAbstractSlider
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)
- Protected Member Functions inherited from QwtDoubleRange
double exactPrevValue () const
double exactValue () const
double prevValue () const
virtual void rangeChange ()
virtual void stepChange ()

Additional Inherited Members

- Public Types inherited from QwtAbstractSlider
enum  ScrollMode {
  ScrNone,
  ScrMouse,
  ScrTimer,
  ScrDirect,
  ScrPage
}
- Signals inherited from QwtAbstractSlider
void sliderMoved (double value)
void sliderPressed ()
void sliderReleased ()
void valueChanged (double value)

Detailed Description

The Wheel Widget.

The wheel widget can be used to change values over a very large range in very small steps. Using the setMass member, it can be configured as a flywheel.

See also:
The radio example.

Member Function Documentation

int QwtWheel::borderWidth ( ) const
Returns:
Border width
See also:
setBorderWidth()
void QwtWheel::drawTicks ( QPainter *  painter,
const QRectF &  rect 
)
protectedvirtual

Draw the Wheel's ticks

Parameters:
painterPainter
rectRectangle for the wheel
void QwtWheel::drawWheelBackground ( QPainter *  painter,
const QRectF &  rect 
)
protectedvirtual

Draw the Wheel's background gradient

Parameters:
painterPainter
rectRectangle for the wheel
void QwtWheel::getScrollMode ( const QPoint &  p,
QwtAbstractSlider::ScrollMode scrollMode,
int &  direction 
) const
protectedvirtual

Determine the scrolling mode and direction corresponding to a specified point.

Parameters:
ppoint
scrollModescrolling mode
directiondirection

Implements QwtAbstractSlider.

double QwtWheel::mass ( ) const
virtual
Returns:
mass

Reimplemented from QwtAbstractSlider.

QSize QwtWheel::minimumSizeHint ( ) const
virtual

Return a minimum size hint.

Warning:
The return value is based on the wheel width.
void QwtWheel::paintEvent ( QPaintEvent *  event)
protectedvirtual

Qt Paint Event.

Parameters:
eventPaint event
void QwtWheel::resizeEvent ( QResizeEvent *  event)
protectedvirtual

Qt Resize Event.

Parameters:
eventResize event
void QwtWheel::setBorderWidth ( int  width)

Set the border width.

The border defaults to 2.

Parameters:
widthBorder width
See also:
borderWidth()
void QwtWheel::setMass ( double  mass)
virtual

Set the mass of the wheel.

Assigning a mass turns the wheel into a flywheel.

Parameters:
massThe wheel's mass

Reimplemented from QwtAbstractSlider.

void QwtWheel::setOrientation ( Qt::Orientation  o)
virtual

Set the wheel's orientation.

Parameters:
oOrientation. Allowed values are Qt::Horizontal and Qt::Vertical. Defaults to Qt::Horizontal.
See also:
QwtAbstractSlider::orientation()

Reimplemented from QwtAbstractSlider.

void QwtWheel::setTickCnt ( int  cnt)

Adjust the number of grooves in the wheel's surface.

The number of grooves is limited to 6 <= cnt <= 50. Values outside this range will be clipped. The default value is 10.

Parameters:
cntNumber of grooves per 360 degrees
See also:
tickCnt()
void QwtWheel::setTotalAngle ( double  angle)
slot

Set the total angle which the wheel can be turned.

One full turn of the wheel corresponds to an angle of 360 degrees. A total angle of n*360 degrees means that the wheel has to be turned n times around its axis to get from the minimum value to the maximum value.

The default setting of the total angle is 360 degrees.

Parameters:
angletotal angle in degrees
See also:
totalAngle()
void QwtWheel::setViewAngle ( double  angle)
slot

Specify the visible portion of the wheel.

You may use this function for fine-tuning the appearance of the wheel. The default value is 175 degrees. The value is limited from 10 to 175 degrees.

Parameters:
angleVisible angle in degrees
See also:
viewAngle(), setTotalAngle()
void QwtWheel::setWheelBorderWidth ( int  borderWidth)

Set the wheel border width of the wheel.

The wheel border must not be smaller than 1 and is limited in dependence on the wheel's size. Values outside the allowed range will be clipped.

The wheel border defaults to 2.

Parameters:
borderWidthBorder width
See also:
internalBorder()
void QwtWheel::setWheelWidth ( int  width)

Set the width of the wheel.

Corresponds to the wheel height for horizontal orientation, and the wheel width for vertical orientation.

Parameters:
widththe wheel's width
See also:
wheelWidth()
QSize QwtWheel::sizeHint ( ) const
virtual
Returns:
a size hint
int QwtWheel::tickCnt ( ) const
Returns:
Number of grooves in the wheel's surface.
See also:
setTickCnt()
double QwtWheel::totalAngle ( ) const
Returns:
Total angle which the wheel can be turned.
See also:
setTotalAngle()
double QwtWheel::viewAngle ( ) const
Returns:
Visible portion of the wheel
See also:
setViewAngle(), totalAngle()
int QwtWheel::wheelBorderWidth ( ) const
Returns:
Wheel border width
See also:
setWheelBorderWidth()
QRect QwtWheel::wheelRect ( ) const
Returns:
Rectangle of the wheel without the outer border
int QwtWheel::wheelWidth ( ) const
Returns:
Width of the wheel
See also:
setWheelWidth()