QwtAbstractSlider - 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)
bool isReadOnly () const
bool isValid () const
virtual double mass () const
double maxValue () const
double minValue () const
Qt::Orientation orientation () const
int pageSize () const
bool periodic () const
QwtAbstractSlider (Qt::Orientation, QWidget *parent=NULL)
virtual void setMass (double val)
virtual void setOrientation (Qt::Orientation o)
void setPeriodic (bool tf)
void setRange (double vmin, double vmax, double vstep=0.0, int pagesize=1)
void setStep (double)
void setTracking (bool enable)
void setUpdateTime (int t)
void setValid (bool valid)
double step () const
void stopMoving ()
double value () const
virtual ~QwtAbstractSlider ()

double exactPrevValue () const
double exactValue () const
virtual void getScrollMode (const QPoint &p, int &scrollMode, int &direction)=0
virtual double getValue (const QPoint &p)=0
virtual void keyPressEvent (QKeyEvent *e)
virtual void mouseMoveEvent (QMouseEvent *e)
double mouseOffset () const
virtual void mousePressEvent (QMouseEvent *e)
virtual void mouseReleaseEvent (QMouseEvent *e)
double prevValue () const
virtual void rangeChange ()
int scrollMode () const
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. Parameters:

Destructor.

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 what to do when the user presses a mouse button. This function is abstract and has to be implemented by derived classes. It is called on a mousePress event. The derived class can determine what should happen next in dependence of the position where the mouse was pressed by returning scrolling mode and direction. QwtAbstractSlider knows the following modes:

QwtAbstractSlider::ScrNone

Scrolling switched off. Don't change the value.

QwtAbstractSlider::ScrMouse

Change the value while the user keeps the button pressed and moves the mouse.

QwtAbstractSlider::ScrTimer

Automatic scrolling. Increment the value in the specified direction as long as the user keeps the button pressed.

QwtAbstractSlider::ScrPage

Automatic scrolling. Same as ScrTimer, but increment by page size.

Parameters:

p point where the mouse was pressed

Return values:

scrollMode The scrolling mode
direction direction: 1, 0, or -1.

Implemented in QwtDial, QwtSlider, and QwtWheel.

Determine the value corresponding to a specified poind. This is an abstract virtual function which is called when the user presses or releases a mouse button or moves the mouse. It has to be implemented by the derived class.

Parameters:

p point

Implemented in QwtDial, QwtSlider, and QwtWheel.

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.

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.

See also:

Reimplemented in QwtWheel.

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:

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.

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.

Set the slider's mass for flywheel effect. If the slider's mass is greater then 0, it will continue to move after the mouse button has been released. Its speed decreases with time at a rate depending on the slider's mass. A large mass means that it will continue to move for a long time.

Derived widgets may overload this function to make it public.

Parameters:

val New mass in kg

See also:

mass()

Reimplemented in QwtWheel.

Set the orientation. Parameters:

Reimplemented in QwtSlider, and QwtWheel.

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.

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.

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.

Parameters:

e Timer event

Returns the current value.

Reimplemented in QwtCounter.

This function can be reimplemented by derived classes in order to keep track of changes, i.e. repaint the widget. The default implementation emits a valueChanged() signal if tracking is enabled.

Reimplemented from QwtDoubleRange.

Reimplemented in QwtDial, QwtSlider, and QwtWheel.

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

Parameters:

e Whell event