QwtWheel Class Reference

Inheritance diagram for QwtWheel:

[legend]Collaboration diagram for QwtWheel:

[legend]List of all members.

---

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.

Definition at line 25 of file qwt_wheel.h.

Public Member Functions
	QwtWheel (QWidget *parent=NULL)
virtual	~QwtWheel ()
virtual void	setOrientation (Qt::Orientation)
double	totalAngle () const
double	viewAngle () const
int	tickCnt () const
int	internalBorder () const
double	mass () const
void	setTotalAngle (double angle)
void	setTickCnt (int cnt)
void	setViewAngle (double angle)
void	setInternalBorder (int width)
void	setMass (double val)
void	setWheelWidth (int w)
virtual QSize	sizeHint () const
virtual QSize	minimumSizeHint () const
Protected Member Functions
virtual void	resizeEvent (QResizeEvent *e)
virtual void	paintEvent (QPaintEvent *e)
void	layoutWheel (bool update=true)
void	draw (QPainter *p, const QRect &update_rect)
void	drawWheel (QPainter *p, const QRect &r)
void	drawWheelBackground (QPainter *p, const QRect &r)
void	setColorArray ()
virtual void	valueChange ()
virtual void	paletteChange (const QPalette &)
virtual double	getValue (const QPoint &p)
virtual void	getScrollMode (const QPoint &p, int &scrollMode, int &direction)

---

Constructor & Destructor Documentation

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

Constructor. Definition at line 51 of file qwt_wheel.cpp.

QwtWheel::~QwtWheel (   )  [virtual]

Destructor. Definition at line 86 of file qwt_wheel.cpp.

---

Member Function Documentation

void QwtWheel::draw (  QPainter *  p, const QRect &  update_rect )  [protected]

Redraw panel and wheel. Definition at line 564 of file qwt_wheel.cpp. References QwtPainter::drawFocusRect(), and drawWheel(). Referenced by paintEvent().

void QwtWheel::drawWheel (  QPainter *  p, const QRect &  r )  [protected]

Redraw the wheel. Parameters: p  painter r  contents rectangle Definition at line 375 of file qwt_wheel.cpp. References drawWheelBackground(), QwtDoubleRange::maxValue(), QwtDoubleRange::minValue(), QwtAbstractSlider::orientation(), and QwtDoubleRange::value(). Referenced by draw().

void QwtWheel::drawWheelBackground (  QPainter *  p, const QRect &  r )  [protected]

Draw the Wheel's background gradient. Definition at line 197 of file qwt_wheel.cpp. References QwtAbstractSlider::orientation(), and setColorArray(). Referenced by drawWheel().

void QwtWheel::getScrollMode (  const QPoint &  p, int &  scrollMode, int &  direction )  [protected, virtual]

Determine the scrolling mode and direction corresponding to a specified point. Parameters: p  point scrollMode  scrolling mode direction  direction Implements QwtAbstractSlider. Definition at line 596 of file qwt_wheel.cpp.

double QwtWheel::getValue (  const QPoint &  p  )  [protected, virtual]

Determine the value corresponding to a specified point. Implements QwtAbstractSlider. Definition at line 494 of file qwt_wheel.cpp. References QwtDoubleRange::maxValue(), QwtDoubleRange::minValue(), and QwtAbstractSlider::orientation().

void QwtWheel::layoutWheel (  bool  update = true  )  [protected]

Recalculate the slider's geometry and layout based on. Definition at line 533 of file qwt_wheel.cpp. Referenced by resizeEvent(), setInternalBorder(), setOrientation(), and setWheelWidth().

double QwtWheel::mass (   )  const [virtual]

Returns: mass Reimplemented from QwtAbstractSlider. Definition at line 168 of file qwt_wheel.cpp. References QwtAbstractSlider::mass().

QSize QwtWheel::minimumSizeHint (   )  const [virtual]

Return a minimum size hint. Warning: The return value is based on the wheel width. Definition at line 642 of file qwt_wheel.cpp. References QwtAbstractSlider::orientation(). Referenced by sizeHint().

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

Qt Paint Event. Definition at line 547 of file qwt_wheel.cpp. References draw().

void QwtWheel::paletteChange (  const QPalette &   )  [protected, virtual]

Call update() when the palette changes. Definition at line 654 of file qwt_wheel.cpp.

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

Qt Resize Event. Definition at line 524 of file qwt_wheel.cpp. References layoutWheel().

void QwtWheel::setColorArray (   )  [protected]

Set up the color array for the background pixmap. Definition at line 96 of file qwt_wheel.cpp. Referenced by drawWheelBackground().

void QwtWheel::setInternalBorder (  int  w  )

Set the internal border width of the wheel. The internal 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 internal border defaults to 2. Parameters: w  border width Definition at line 183 of file qwt_wheel.cpp. References layoutWheel().

void QwtWheel::setMass (  double  val  )  [virtual]

Set the mass of the wheel. Assigning a mass turns the wheel into a flywheel. Parameters: val  the wheel's mass Reimplemented from QwtAbstractSlider. Definition at line 612 of file qwt_wheel.cpp. References QwtAbstractSlider::setMass().

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

Set the wheel's orientation. Parameters: o  Orientation. Allowed values are Qt::Horizontal and Qt::Vertical. Defaults to Qt::Horizontal. See also: QwtAbstractSlider::orientation() Reimplemented from QwtAbstractSlider. Definition at line 325 of file qwt_wheel.cpp. References layoutWheel(), QwtAbstractSlider::orientation(), and QwtAbstractSlider::setOrientation().

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: cnt  Number of grooves per 360 degrees Definition at line 154 of file qwt_wheel.cpp.

void QwtWheel::setTotalAngle (  double  angle  )

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: angle  total angle in degrees Definition at line 304 of file qwt_wheel.cpp.

void QwtWheel::setViewAngle (  double  angle  )

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: angle  Visible angle in degrees Definition at line 359 of file qwt_wheel.cpp.

void QwtWheel::setWheelWidth (  int  w  )

Set the width of the wheel. Corresponds to the wheel height for horizontal orientation, and the wheel width for vertical orientation. Parameters: w  the wheel's width Definition at line 624 of file qwt_wheel.cpp. References layoutWheel().

QSize QwtWheel::sizeHint (   )  const [virtual]

Returns: a size hint Definition at line 633 of file qwt_wheel.cpp. References minimumSizeHint().

void QwtWheel::valueChange (   )  [protected, virtual]

Notify value change. Reimplemented from QwtAbstractSlider. Definition at line 582 of file qwt_wheel.cpp. References QwtAbstractSlider::valueChange().

---