#include <qwt_slider.h>

Inherits QwtAbstractSlider, and QwtAbstractScale.

Public Types
enum	BackgroundStyle { Trough = 0x01, Groove = 0x02 }
typedef QFlags< BackgroundStyle >	BackgroundStyles
enum	ScalePos { NoScale, LeftScale, RightScale, TopScale, BottomScale }
enum	ScrollMode { ScrNone, ScrMouse, ScrTimer, ScrDirect, ScrPage }
Public Slots
virtual void	fitValue (double val)
virtual void	incValue (int steps)
virtual void	setReadOnly (bool)
virtual void	setValue (double val)
Signals
void	sliderMoved (double value)
void	sliderPressed ()
void	sliderReleased ()
void	valueChanged (double value)
Public Member Functions
bool	autoScale () const
BackgroundStyles	backgroundStyle () const
int	borderWidth () const
QSize	handleSize () const
virtual void	incPages (int)
bool	isReadOnly () const
bool	isValid () const
virtual double	mass () const
double	maxValue () const
virtual QSize	minimumSizeHint () const
double	minValue () const
Qt::Orientation	orientation () const
int	pageSize () const
bool	periodic () const
	QwtSlider (QWidget *parent, Qt::Orientation=Qt::Horizontal, ScalePos=NoScale, BackgroundStyles=Trough)
const QwtScaleDraw *	scaleDraw () const
const QwtScaleEngine *	scaleEngine () const
QwtScaleEngine *	scaleEngine ()
const QwtScaleMap &	scaleMap () const
int	scaleMaxMajor () const
int	scaleMaxMinor () const
ScalePos	scalePosition () const
void	setAutoScale ()
void	setBackgroundStyle (BackgroundStyles)
void	setBorderWidth (int bw)
void	setHandleSize (int width, int height)
void	setHandleSize (const QSize &)
virtual 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	setScale (double vmin, double vmax, double step=0.0)
void	setScale (const QwtInterval &, double step=0.0)
void	setScale (const QwtScaleDiv &)
void	setScaleDraw (QwtScaleDraw *)
void	setScaleEngine (QwtScaleEngine *)
void	setScaleMaxMajor (int ticks)
void	setScaleMaxMinor (int ticks)
void	setScalePosition (ScalePos s)
void	setSpacing (int)
void	setStep (double)
void	setTracking (bool enable)
void	setUpdateTime (int t)
void	setValid (bool valid)
virtual QSize	sizeHint () const
int	spacing () const
double	step () const
void	stopMoving ()
double	value () const
Protected Member Functions
const QwtAbstractScaleDraw *	abstractScaleDraw () const
QwtAbstractScaleDraw *	abstractScaleDraw ()
virtual void	changeEvent (QEvent *)
virtual void	drawHandle (QPainter *, const QRect &, int pos) const
virtual void	drawSlider (QPainter *, const QRect &) const
double	exactPrevValue () const
double	exactValue () const
virtual void	getScrollMode (const QPoint &p, QwtAbstractSlider::ScrollMode &, int &direction) const
virtual double	getValue (const QPoint &p)
virtual void	keyPressEvent (QKeyEvent *e)
virtual void	mouseMoveEvent (QMouseEvent *e)
double	mouseOffset () const
virtual void	mousePressEvent (QMouseEvent *e)
virtual void	mouseReleaseEvent (QMouseEvent *e)
virtual void	paintEvent (QPaintEvent *)
double	prevValue () const
virtual void	rangeChange ()
void	rescale (double vmin, double vmax, double step=0.0)
virtual void	resizeEvent (QResizeEvent *)
virtual void	scaleChange ()
QwtScaleDraw *	scaleDraw ()
int	scrollMode () const
void	setAbstractScaleDraw (QwtAbstractScaleDraw *)
void	setMouseOffset (double)
virtual void	setPosition (const QPoint &)
virtual void	stepChange ()
virtual void	timerEvent (QTimerEvent *e)
int	transform (double v) const
virtual void	valueChange ()
virtual void	wheelEvent (QWheelEvent *e)

Detailed Description

The Slider Widget.

QwtSlider is a slider widget which operates on an interval of type double. QwtSlider supports different layouts as well as a scale.

See also:: QwtAbstractSlider and QwtAbstractScale for the descriptions of the inherited members.

Member Typedef Documentation

typedef QFlags<BackgroundStyle> QwtSlider::BackgroundStyles

Background styles.

Member Enumeration Documentation

enum QwtSlider::BackgroundStyle

Background style.

See also:: QwtSlider()

Enumerator:

Trough	Trough background.
Groove	Groove.

enum QwtSlider::ScalePos

Scale position. QwtSlider tries to enforce valid combinations of its orientation and scale position:

Qt::Horizonal combines with NoScale, TopScale and BottomScale
Qt::Vertical combines with NoScale, LeftScale and RightScale

See also:: QwtSlider()

Enumerator:

NoScale	The slider has no scale.
LeftScale	The scale is left of the slider.
RightScale	The scale is right of the slider.
TopScale	The scale is above of the slider.
BottomScale	The scale is below of the slider.

enum QwtAbstractSlider::ScrollMode [inherited]

Scroll mode

See also:: getScrollMode()

Enumerator:

ScrNone	Scrolling switched off. Don't change the value.
ScrMouse	Change the value while the user keeps the button pressed and moves the mouse.
ScrTimer	Automatic scrolling. Increment the value in the specified direction as long as the user keeps the button pressed.
ScrPage	Automatic scrolling. Same as ScrTimer, but increment by page size.

Constructor & Destructor Documentation

QwtSlider::QwtSlider	(	QWidget *	parent,
		Qt::Orientation	orientation = `Qt::Horizontal`,
		ScalePos	scalePos = `NoScale`,
		BackgroundStyles	bgStyle = `Trough`
	)		`[explicit]`

Constructor.

Parameters:

parent	parent widget
orientation	Orientation of the slider. Can be Qt::Horizontal or Qt::Vertical. Defaults to Qt::Horizontal.
scalePos	Position of the scale. Defaults to QwtSlider::NoScale.
bgStyle	Background style. QwtSlider::Trough draws the slider button in a trough, QwtSlider::Slot draws a slot underneath the button. An or-combination of both may also be used. The default is QwtSlider::Trough.

QwtSlider enforces valid combinations of its orientation and scale position. If the combination is invalid, the scale position will be set to NoScale. Valid combinations are:

Qt::Horizonal with NoScale, TopScale, or BottomScale;
Qt::Vertical with NoScale, LeftScale, or RightScale.

Member Function Documentation

const QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw ( ) const [protected, inherited]

Returns:: Scale draw

See also:: setAbstractScaleDraw()

QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw ( ) [protected, inherited]

Returns:: Scale draw

See also:: setAbstractScaleDraw()

bool QwtAbstractScale::autoScale ( ) const [inherited]

Returns:: true if autoscaling is enabled

QwtSlider::BackgroundStyles QwtSlider::backgroundStyle ( ) const

Returns:: the background style.

int QwtSlider::borderWidth ( ) const

Returns:: the border width.

See also:: setBorderWidth()

void QwtSlider::changeEvent ( QEvent * event ) [protected, virtual]

Qt change event handler.

void QwtSlider::drawHandle	(	QPainter *	painter,
		const QRect &	sliderRect,
		int	pos
	)		const `[protected, virtual]`

Draw the thumb at a position

Parameters:

painter	Painter
sliderRect	Bounding rectangle of the slider
pos	Position of the slider thumb

void QwtSlider::drawSlider	(	QPainter *	painter,
		const QRect &	sliderRect
	)		const `[protected, virtual]`

Draw the slider into the specified rectangle.

Parameters:

painter	Painter
sliderRect	Bounding rectangle of the slider

double QwtDoubleRange::exactPrevValue ( ) const [protected, inherited]

Returns the exact previous value.

double QwtDoubleRange::exactValue ( ) const [protected, inherited]

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 fitValue() or incValue() have been used before. This function is intended for internal use in derived classes.

void QwtAbstractSlider::fitValue ( double value ) [virtual, slot, inherited]

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

Parameters:

value Value

See also:: setValue(), incValue()

Reimplemented from QwtDoubleRange.

void QwtSlider::getScrollMode	(	const QPoint &	p,
		QwtAbstractSlider::ScrollMode &	scrollMode,
		int &	direction
	)		const `[protected, virtual]`

Determine scrolling mode and direction.

Parameters:

p	point
scrollMode	Scrolling mode
direction	Direction

Implements QwtAbstractSlider.

double QwtSlider::getValue ( const QPoint & pos ) [protected, virtual]

Determine the value corresponding to a specified mouse location.

Parameters:

pos	Mouse position

Implements QwtAbstractSlider.

QSize QwtSlider::handleSize ( ) const

Returns:: Size of the handle.

See also:: setHandleSize()

void QwtDoubleRange::incPages ( int nPages ) [virtual, inherited]

Increment the value by a specified number of pages.

Parameters:

nPages Number of pages to increment. A negative number decrements the value.

Warning:: The Page size is specified in the constructor.

void QwtAbstractSlider::incValue ( int steps ) [virtual, slot, inherited]

Increment the value by a specified number of steps.

Parameters:

steps number of steps

See also:: setValue()

Reimplemented from QwtDoubleRange.

bool QwtAbstractSlider::isReadOnly ( ) const [inherited]

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

Returns:: true if read only

See also:: setReadOnly()

bool QwtAbstractSlider::isValid ( ) const [inline, inherited]

See also:: QwtDblRange::isValid()

Reimplemented from QwtDoubleRange.

void QwtAbstractSlider::keyPressEvent ( QKeyEvent * e ) [protected, virtual, inherited]

Handles key events

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

Parameters:

e Key event

See also:: isReadOnly()

Reimplemented in QwtDial, and QwtCompass.

double QwtAbstractSlider::mass ( ) const [virtual, inherited]

Returns:: mass

See also:: setMass()

Reimplemented in QwtWheel.

double QwtDoubleRange::maxValue ( ) const [inherited]

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:: setRange()

Reimplemented in QwtCounter.

QSize QwtSlider::minimumSizeHint ( ) const [virtual]

Return a minimum size hint.

Warning:: The return value of QwtSlider::minimumSizeHint() depends on the font and the scale.

double QwtDoubleRange::minValue ( ) const [inherited]

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:: setRange()

Reimplemented in QwtCounter.

void QwtAbstractSlider::mouseMoveEvent ( QMouseEvent * e ) [protected, virtual, inherited]

Mouse Move Event handler

Parameters:

e	Mouse event

double QwtAbstractSlider::mouseOffset ( ) const [protected, inherited]

See also:: setMouseOffset()

void QwtAbstractSlider::mousePressEvent ( QMouseEvent * e ) [protected, virtual, inherited]

Mouse press event handler

Parameters:

e	Mouse event

void QwtAbstractSlider::mouseReleaseEvent ( QMouseEvent * e ) [protected, virtual, inherited]

Mouse Release Event handler

Parameters:

e	Mouse event

Qt::Orientation QwtAbstractSlider::orientation ( ) const [inherited]

Returns:: Orientation

See also:: setOrientation()

int QwtDoubleRange::pageSize ( ) const [inherited]

Returns the page size in steps.

void QwtSlider::paintEvent ( QPaintEvent * event ) [protected, virtual]

Qt paint event

Parameters:

event Paint event

bool QwtDoubleRange::periodic ( ) const [inherited]

Returns true if the range is periodic.

See also:: setPeriodic()

double QwtDoubleRange::prevValue ( ) const [protected, inherited]

Returns the previous value.

void QwtSlider::rangeChange ( ) [protected, virtual]

Notify change of range.

Reimplemented from QwtDoubleRange.

void QwtAbstractScale::rescale	(	double	vmin,
		double	vmax,
		double	stepSize = `0.0`
	)		`[protected, inherited]`

Recalculate the scale division and update the scale draw.

Parameters:

vmin	Lower limit of the scale interval
vmax	Upper limit of the scale interval
stepSize	Major step size

See also:: scaleChange()

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

Qt resize event.

void QwtSlider::scaleChange ( ) [protected, virtual]

Notify changed scale.

Reimplemented from QwtAbstractScale.

const QwtScaleDraw * QwtSlider::scaleDraw ( ) const

Returns:: the scale draw of the slider

See also:: setScaleDraw()

QwtScaleDraw * QwtSlider::scaleDraw ( ) [protected]

Returns:: the scale draw of the slider

See also:: setScaleDraw()

const QwtScaleEngine * QwtAbstractScale::scaleEngine ( ) const [inherited]

Returns:: Scale engine

See also:: setScaleEngine()

QwtScaleEngine * QwtAbstractScale::scaleEngine ( ) [inherited]

Returns:: Scale engine

See also:: setScaleEngine()

const QwtScaleMap & QwtAbstractScale::scaleMap ( ) const [inherited]

Returns:: abstractScaleDraw()->scaleMap()

int QwtAbstractScale::scaleMaxMajor ( ) const [inherited]

Returns:: Max. number of major tick intervals The default value is 5.

int QwtAbstractScale::scaleMaxMinor ( ) const [inherited]

Returns:: Max. number of minor tick intervals The default value is 3.

QwtSlider::ScalePos QwtSlider::scalePosition ( ) const

Return the scale position.

int QwtAbstractSlider::scrollMode ( ) const [protected, inherited]

sa ScrollMode

void QwtAbstractScale::setAbstractScaleDraw ( QwtAbstractScaleDraw * scaleDraw ) [protected, inherited]

Set a scale draw.

scaleDraw has to be created with new and will be deleted in ~QwtAbstractScale or the next call of setAbstractScaleDraw.

void QwtAbstractScale::setAutoScale ( ) [inherited]

Advise the widget to control the scale range internally.

Autoscaling is on by default.

See also:: setScale(), autoScale()

void QwtSlider::setBackgroundStyle ( BackgroundStyles style )

Set the background style.

void QwtSlider::setBorderWidth ( int width )

Change the slider's border width.

Parameters:

width Border width

void QwtSlider::setHandleSize	(	int	width,
		int	height
	)

Set the slider's handle size.

Parameters:

width	Width
height	Height

See also:: handleSize()

void QwtSlider::setHandleSize ( const QSize & size )

Set the slider's handle size.

Parameters:

size New size

See also:: handleSize()

void QwtAbstractSlider::setMass ( double val ) [virtual, inherited]

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.

void QwtAbstractSlider::setMouseOffset ( double offset ) [protected, inherited]

See also:: mouseOffset()

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

Set the orientation.

Parameters:

o	Orientation. Allowed values are Qt::Horizontal and Qt::Vertical.

If the new orientation and the old scale position are an invalid combination, the scale position will be set to QwtSlider::NoScale.

See also:: QwtAbstractSlider::orientation()

Reimplemented from QwtAbstractSlider.

void QwtDoubleRange::setPeriodic ( bool tf ) [inherited]

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

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

void QwtAbstractSlider::setPosition ( const QPoint & p ) [protected, virtual, inherited]

Move the slider to a specified point, adjust the value and emit signals if necessary.

void QwtDoubleRange::setRange	(	double	vmin,
		double	vmax,
		double	vstep = `0.0`,
		int	pageSize = `1`
	)		`[inherited]`

Specify range and step size.

Parameters:

vmin	lower boundary of the interval
vmax	higher boundary of the interval
vstep	step width
pageSize	page size in steps

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.

void QwtAbstractSlider::setReadOnly ( bool readOnly ) [virtual, slot, inherited]

En/Disable read only mode

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

Parameters:

readOnly Enables in case of true

See also:: isReadOnly()

void QwtAbstractScale::setScale	(	double	vmin,
		double	vmax,
		double	stepSize = `0.0`
	)		`[inherited]`

Specify a scale.

Disable autoscaling and define a scale by an interval and a step size

Parameters:

vmin	lower limit of the scale interval
vmax	upper limit of the scale interval
stepSize	major step size

    d_data->autoScale = false;
    d_data->stepSize = stepSize;

    rescale( vmin, vmax, stepSize );
    QwtAbstractScale *xx = new QwtAbstractScale(12, "hello", this);

See also:: setAutoScale()

void QwtAbstractScale::setScale	(	const QwtInterval &	interval,
		double	stepSize = `0.0`
	)		`[inherited]`

Specify a scale.

Disable autoscaling and define a scale by an interval and a step size

Parameters:

interval	Interval
stepSize	major step size

See also:: setAutoScale()

void QwtAbstractScale::setScale ( const QwtScaleDiv & scaleDiv ) [inherited]

Specify a scale.

Disable autoscaling and define a scale by a scale division

Parameters:

scaleDiv Scale division

See also:: setAutoScale()

void QwtSlider::setScaleDraw ( QwtScaleDraw * scaleDraw )

Set a scale draw.

For changing the labels of the scales, it is necessary to derive from QwtScaleDraw and overload QwtScaleDraw::label().

Parameters:

scaleDraw ScaleDraw object, that has to be created with new and will be deleted in ~QwtSlider or the next call of setScaleDraw().

See also:: scaleDraw()

void QwtAbstractScale::setScaleEngine ( QwtScaleEngine * scaleEngine ) [inherited]

Set a scale engine.

The scale engine is responsible for calculating the scale division, and in case of auto scaling how to align the scale.

scaleEngine has to be created with new and will be deleted in ~QwtAbstractScale or the next call of setScaleEngine.

void QwtAbstractScale::setScaleMaxMajor ( int ticks ) [inherited]

Set the maximum number of major tick intervals.

The scale's major ticks are calculated automatically such that the number of major intervals does not exceed ticks. The default value is 5.

Parameters:

ticks maximal number of major ticks.

See also:: QwtAbstractScaleDraw

void QwtAbstractScale::setScaleMaxMinor ( int ticks ) [inherited]

Set the maximum number of minor tick intervals.

The scale's minor ticks are calculated automatically such that the number of minor intervals does not exceed ticks. The default value is 3.

Parameters:

ticks

See also:: QwtAbstractScaleDraw

void QwtSlider::setScalePosition ( ScalePos scalePos )

Change the scale position (and slider orientation).

Parameters:

scalePos Position of the scale.

A valid combination of scale position and orientation is enforced:

if the new scale position is Left or Right, the scale orientation will become Qt::Vertical;
if the new scale position is Bottom or Top the scale orientation will become Qt::Horizontal;
if the new scale position is QwtSlider::NoScale, the scale orientation will not change.

void QwtSlider::setSpacing ( int spacing )

Change the spacing between pipe and scale.

A spacing of 0 means, that the backbone of the scale is below the trough.

The default setting is 4 pixels.

Parameters:

spacing Number of pixels

See also:: spacing();

void QwtDoubleRange::setStep ( double vstep ) [inherited]

Change the step raster.

Parameters:

vstep new step width

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

Reimplemented in QwtCounter.

void QwtAbstractSlider::setTracking ( bool enable ) [inherited]

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.

void QwtAbstractSlider::setUpdateTime ( int t ) [inherited]

Specify the update interval for automatic scrolling.

Parameters:

t	update interval in milliseconds

See also:: getScrollMode()

void QwtAbstractSlider::setValid ( bool valid ) [inline, inherited]

Parameters:

valid true/false

See also:: QwtDblRange::isValid()

Reimplemented from QwtDoubleRange.

void QwtAbstractSlider::setValue ( double val ) [virtual, slot, inherited]

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.

QSize QwtSlider::sizeHint ( ) const [virtual]

Returns:: QwtSlider::minimumSizeHint()

void QwtAbstractSlider::sliderMoved ( double value ) [signal, inherited]

This signal is emitted when the user moves the slider with the mouse.

Parameters:

value new value

void QwtAbstractSlider::sliderPressed ( ) [signal, inherited]

This signal is emitted when the user presses the movable part of the slider (start ScrMouse Mode).

void QwtAbstractSlider::sliderReleased ( ) [signal, inherited]

This signal is emitted when the user releases the movable part of the slider.

int QwtSlider::spacing ( ) const

Returns:: Number of pixels between slider and scale

See also:: setSpacing()

double QwtDoubleRange::step ( ) const [inherited]

Returns:: the step size

See also:: setStep(), setRange()

Reimplemented in QwtCounter.

void QwtDoubleRange::stepChange ( ) [protected, virtual, inherited]

Notify a change of the step size.

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

void QwtAbstractSlider::stopMoving ( ) [inherited]

Stop updating if automatic scrolling is active.

void QwtAbstractSlider::timerEvent ( QTimerEvent * e ) [protected, virtual, inherited]

Qt timer event

Parameters:

e	Timer event

int QwtSlider::transform ( double value ) const [protected]

Map and round a value into widget coordinates

Parameters:

value Value

double QwtDoubleRange::value ( ) const [inherited]

Returns the current value.

Reimplemented in QwtCounter.

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

Notify change of value.

Reimplemented from QwtAbstractSlider.

void QwtAbstractSlider::valueChanged ( double value ) [signal, inherited]

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

void QwtAbstractSlider::wheelEvent ( QWheelEvent * e ) [protected, virtual, inherited]

Wheel Event handler

Parameters:

e	Whell event

Public Types

Public Slots

Signals

Public Member Functions

Protected Member Functions

Detailed Description

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation