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QwtWheel Class Reference

The Wheel Widget. More...

#include <qwt_wheel.h>

Inheritance diagram for QwtWheel::

QwtSliderBase QwtDblRange List of all members.

Public Methods

 QwtWheel (QWidget *parent=0, const char *name=0)
virtual ~QwtWheel ()
void setTotalAngle (double angle)
void setTickCnt (int cnt)
void setOrientation (Qt::Orientation o)
void setViewAngle (double angle)
void setInternalBorder (int width)
void setMass (double val)
void setWheelWidth (int w)
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
virtual QSizePolicy sizePolicy () const

Protected Methods

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)

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.


Constructor & Destructor Documentation

QwtWheel::QwtWheel QWidget *    parent = 0,
const char *    name = 0
 

Constructor.

QwtWheel::~QwtWheel   [virtual]
 

Destructor.


Member Function Documentation

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

Redraw panel and wheel.

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

Redraw the wheel.

Parameters:
p  painter
r  contents rectangle

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

Draw the Wheel's background gradient.

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

Reimplemented from QwtSliderBase.

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

Determine the value corresponding to a specified point.

Reimplemented from QwtSliderBase.

void QwtWheel::layoutWheel bool    update_geometry = TRUE [protected]
 

Recalculate the slider's geometry and layout based on.

QSize QwtWheel::minimumSizeHint   const [virtual]
 

Return a minimum size hint.

Warning:
The return value is based on the wheel width.

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

Qt Paint Event.

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

Call update() when the palette changes.

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

Qt Resize Event.

void QwtWheel::setColorArray   [protected]
 

Set up the color array for the background pixmap.

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

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 QwtSliderBase.

void QwtWheel::setOrientation Qt::Orientation    o
 

Set the wheel's orientation.

Parameters:
o  Orientation. Allowed values are Qt::Horizontal and Qt::Vertical. Defaults to Qt::Horizontal.

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

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

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

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

QSize QwtWheel::sizeHint   const [virtual]
 

Returns:
a size hint

QSizePolicy QwtWheel::sizePolicy   const [virtual]
 

Returns:
Preferred/Fixed for horizontal, Fixed/Preferred for vertical scales.

void QwtWheel::valueChange   [protected, virtual]
 

Notify value change.

Reimplemented from QwtSliderBase.


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