QwtWheel - Man Page

enum ScrollMode { ScrNone, ScrMouse, ScrTimer, ScrDirect, ScrPage }

virtual void fitValue (double val)
virtual void incValue (int steps)
virtual void setReadOnly (bool)
virtual void setValue (double val)

void sliderMoved (double value)
void sliderPressed ()
void sliderReleased ()
void valueChanged (double value)

virtual void incPages (int)
int internalBorder () const
bool isReadOnly () const
bool isValid () const
double mass () const
double maxValue () const
virtual QSize minimumSizeHint () const
double minValue () const
Qt::Orientation orientation () const
int pageSize () const
bool periodic () const
QwtWheel (QWidget *parent=NULL)
void setInternalBorder (int width)
void setMass (double val)
virtual void setOrientation (Qt::Orientation)
void setPeriodic (bool tf)
void setRange (double vmin, double vmax, double vstep=0.0, int pagesize=1)
void setStep (double)
void setTickCnt (int cnt)
void setTotalAngle (double angle)
void setTracking (bool enable)
void setUpdateTime (int t)
void setValid (bool valid)
void setViewAngle (double angle)
void setWheelWidth (int w)
virtual QSize sizeHint () const
double step () const
void stopMoving ()
int tickCnt () const
double totalAngle () const
double value () const
double viewAngle () const
virtual ~QwtWheel ()

void draw (QPainter *, const QRect &)
void drawWheel (QPainter *, const QRect &)
void drawWheelBackground (QPainter *, const QRect &)
double exactPrevValue () const
double exactValue () const
virtual void getScrollMode (const QPoint &, int &scrollMode, int &direction)
virtual double getValue (const QPoint &)
virtual void keyPressEvent (QKeyEvent *e)
void layoutWheel (bool update=true)
virtual void mouseMoveEvent (QMouseEvent *e)
double mouseOffset () const
virtual void mousePressEvent (QMouseEvent *e)
virtual void mouseReleaseEvent (QMouseEvent *e)
virtual void paintEvent (QPaintEvent *e)
virtual void paletteChange (const QPalette &)
double prevValue () const
virtual void rangeChange ()
virtual void resizeEvent (QResizeEvent *e)
int scrollMode () const
void setColorArray ()
void setMouseOffset (double)
virtual void setPosition (const QPoint &)
virtual void stepChange ()
virtual void timerEvent (QTimerEvent *e)
virtual void valueChange ()
virtual void wheelEvent (QWheelEvent *e)

See also:

Constructor.

Destructor.

Parameters:

painter Painter

Redraw the wheel. Parameters:

Parameters:

painter Painter
r Bounding rectangle

Returns the exact previous value.

Returns the exact value. The exact value is the value which QwtDoubleRange::value would return if the value were not adjusted to the step raster. It differs from the current value only if QwtDoubleRange::fitValue or QwtDoubleRange::incValue have been used before. This function is intended for internal use in derived classes.

Set the slider's value to the nearest integer multiple of the step size. Parameters:

See also:

Reimplemented from QwtDoubleRange.

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

Implements QwtAbstractSlider.

Determine the value corresponding to a specified point.

Implements QwtAbstractSlider.

Increment the value by a specified number of pages. Parameters:

Warning:

The Page size is specified in the constructor.

Increment the value by a specified number of steps. Parameters:

See also:

Reimplemented from QwtDoubleRange.

See also:

Returns:

true if read only

See also:

setReadOnly()

Reimplemented from QwtDoubleRange.

• Key_Down, KeyLeft
  Decrement by 1
• Key_Up, Key_Right
  Increment by 1

Parameters:

e Key event

See also:

isReadOnly()

Reimplemented in QwtCompass, and QwtDial.

Recalculate the slider's geometry and layout based on.

Reimplemented from QwtAbstractSlider.

Returns the value of the second border of the range. maxValue returns the value which has been specified as the second parameter in QwtDoubleRange::setRange.

See also:

Return a minimum size hint. Warning:

Returns the value at the first border of the range. minValue returns the value which has been specified as the first parameter in setRange().

See also:

Parameters:

e Mouse event

Parameters:

e Mouse event

Parameters:

e Mouse event

See also:

Returns the page size in steps.

Qt Paint Event.

Call update() when the palette changes.

Returns true if the range is periodic. See also:

Returns the previous value.

Notify a change of the range. This virtual function is called whenever the range changes. The default implementation does nothing.

Reimplemented in QwtCounter, QwtDial, and QwtSlider.

Qt Resize Event.

Set up the color array for the background pixmap.

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

See also:

internalBorder()

Set the mass of the wheel. Assigning a mass turns the wheel into a flywheel.

Parameters:

val the wheel's mass

Reimplemented from QwtAbstractSlider.

Set the wheel's orientation. Parameters:

See also:

Reimplemented from QwtAbstractSlider.

Make the range periodic. When the range is periodic, the value will be set to a point inside the interval such that

point = value + n * width .fi


if the user tries to set a new value which is outside the range. If the range is nonperiodic (the default), values outside the range will be clipped.

Parameters:
  tf true for a periodic range

Specify range and step size. Parameters:

Warning:

• A change of the range changes the value if it lies outside the new range. The current value will *not* be adjusted to the new step raster.
• vmax < vmin is allowed.
• If the step size is left out or set to zero, it will be set to 1/100 of the interval length.
• If the step size has an absurd value, it will be corrected to a better one.

In read only mode the slider can't be controlled by mouse or keyboard.

Parameters:

readOnly Enables in case of true

See also:

isReadOnly()

Change the step raster. Parameters:

Warning:

The value will not be adjusted to the new step raster.

Reimplemented in QwtCounter.

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

See also:

tickCnt()

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

See also:

totalAngle()

Enables or disables tracking. If tracking is enabled, the slider emits a valueChanged() signal whenever its value changes (the default behaviour). If tracking is disabled, the value changed() signal will only be emitted if:

• the user releases the mouse button and the value has changed or
• at the end of automatic scrolling.

Tracking is enabled by default.

Parameters:

enable true (enable) or false (disable) tracking.

Specify the update interval for automatic scrolling. Parameters:

See also:

See also:

Reimplemented from QwtDoubleRange.

Move the slider to a specified value. This function can be used to move the slider to a value which is not an integer multiple of the step size.

Parameters:

val new value

See also:

fitValue()

Reimplemented from QwtDoubleRange.

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

See also:

viewAngle(), setTotalAngle()

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

Parameters:

value new value

See also:

Reimplemented in QwtCounter.

Notify a change of the step size. This virtual function is called whenever the step size changes. The default implementation does nothing.

Stop updating if automatic scrolling is active.

See also:

Parameters:

e Timer event

See also:

Returns the current value.

Reimplemented in QwtCounter.

Notify value change.

Reimplemented from QwtAbstractSlider.

Notify a change of value. In the default setting (tracking enabled), this signal will be emitted every time the value changes ( see setTracking() ).

Parameters:

value new value

See also:

Parameters:

e Whell event