The Slider Widget. More...

#include <qwt_slider.h>

Inheritance diagram for QwtSlider:

Public Types
enum	ScalePosition { NoScale , LeadingScale , TrailingScale }

Public Member Functions
	QwtSlider (QWidget *parent=NULL)

	QwtSlider (Qt::Orientation, QWidget *parent=NULL)

virtual	~QwtSlider ()
	Destructor.

void	setOrientation (Qt::Orientation)
	Set the orientation.

Qt::Orientation	orientation () const

void	setScalePosition (ScalePosition)
	Change the position of the scale.

ScalePosition	scalePosition () const

void	setTrough (bool)

bool	hasTrough () const

void	setGroove (bool)

bool	hasGroove () const

void	setHandleSize (const QSize &)
	Set the slider's handle size.

QSize	handleSize () const

void	setBorderWidth (int)
	Change the slider's border width.

int	borderWidth () const

void	setSpacing (int)
	Change the spacing between trough and scale.

int	spacing () const

virtual QSize	sizeHint () const override

virtual QSize	minimumSizeHint () const override

void	setScaleDraw (QwtScaleDraw *)
	Set a scale draw.

const QwtScaleDraw *	scaleDraw () const

void	setUpdateInterval (int)
	Specify the update interval for automatic scrolling.

int	updateInterval () const

Public Member Functions inherited from QwtAbstractSlider
	QwtAbstractSlider (QWidget *parent=NULL)
	Constructor.

virtual	~QwtAbstractSlider ()
	Destructor.

void	setValid (bool)

bool	isValid () const

double	value () const
	Returns the current value.

void	setWrapping (bool)

bool	wrapping () const

void	setTotalSteps (uint)
	Set the number of steps.

uint	totalSteps () const

void	setSingleSteps (uint)
	Set the number of steps for a single increment.

uint	singleSteps () const

void	setPageSteps (uint)
	Set the number of steps for a page increment.

uint	pageSteps () const

void	setStepAlignment (bool)
	Enable step alignment.

bool	stepAlignment () const

void	setTracking (bool)
	Enables or disables tracking.

bool	isTracking () const

void	setReadOnly (bool)

bool	isReadOnly () const

void	setInvertedControls (bool)

bool	invertedControls () const

Public Member Functions inherited from QwtAbstractScale
	QwtAbstractScale (QWidget *parent=NULL)

virtual	~QwtAbstractScale ()
	Destructor.

void	setScale (double lowerBound, double upperBound)
	Specify a scale.

void	setScale (const QwtInterval &)
	Specify a scale.

void	setScale (const QwtScaleDiv &)
	Specify a scale.

const QwtScaleDiv &	scaleDiv () const

void	setLowerBound (double value)

double	lowerBound () const

void	setUpperBound (double value)

double	upperBound () const

void	setScaleStepSize (double stepSize)
	Set the step size used for calculating a scale division.

double	scaleStepSize () const

void	setScaleMaxMajor (int ticks)
	Set the maximum number of major tick intervals.

int	scaleMaxMinor () const

void	setScaleMaxMinor (int ticks)
	Set the maximum number of minor tick intervals.

int	scaleMaxMajor () const

void	setScaleEngine (QwtScaleEngine *)
	Set a scale engine.

const QwtScaleEngine *	scaleEngine () const

QwtScaleEngine *	scaleEngine ()

int	transform (double) const

double	invTransform (int) const

bool	isInverted () const

double	minimum () const

double	maximum () const

const QwtScaleMap &	scaleMap () const

Protected Member Functions
virtual double	scrolledTo (const QPoint &) const override
	Determine the value for a new position of the slider handle.

virtual bool	isScrollPosition (const QPoint &) const override
	Determine what to do when the user presses a mouse button.

virtual void	drawSlider (QPainter *, const QRect &) const

virtual void	drawHandle (QPainter *, const QRect &, int pos) const

virtual void	mousePressEvent (QMouseEvent *) override

virtual void	mouseReleaseEvent (QMouseEvent *) override

virtual void	resizeEvent (QResizeEvent *) override

virtual void	paintEvent (QPaintEvent *) override

virtual void	changeEvent (QEvent *) override

virtual void	timerEvent (QTimerEvent *) override

virtual bool	event (QEvent *) override

virtual void	scaleChange () override
	Notify changed scale.

QRect	sliderRect () const

QRect	handleRect () const

Protected Member Functions inherited from QwtAbstractSlider
virtual void	mouseMoveEvent (QMouseEvent *) override

virtual void	keyPressEvent (QKeyEvent *) override

virtual void	wheelEvent (QWheelEvent *) override

void	incrementValue (int stepCount)

virtual void	sliderChange ()
	Calling update()

double	incrementedValue (double value, int stepCount) const

Protected Member Functions inherited from QwtAbstractScale
void	rescale (double lowerBound, double upperBound, double stepSize)

void	setAbstractScaleDraw (QwtAbstractScaleDraw *)
	Set a scale draw.

const QwtAbstractScaleDraw *	abstractScaleDraw () const

QwtAbstractScaleDraw *	abstractScaleDraw ()

void	updateScaleDraw ()

Additional Inherited Members
Public Slots inherited from QwtAbstractSlider
void	setValue (double value)

Signals inherited from QwtAbstractSlider
void	valueChanged (double value)
	Notify a change of value.

void	sliderPressed ()

void	sliderReleased ()

void	sliderMoved (double value)

Detailed Description

The Slider Widget.

QwtSlider is a slider widget which operates on an interval of type double. Its position is related to a scale showing the current value.

The slider can be customized by having a through, a groove - or both.

Definition at line 30 of file qwt_slider.h.

Member Enumeration Documentation

◆ ScalePosition

enum QwtSlider::ScalePosition

Position of the scale

See also: QwtSlider(), setScalePosition(), setOrientation()

Enumerator
NoScale	The slider has no scale.
LeadingScale	The scale is right of a vertical or below a horizontal slider.
TrailingScale	The scale is left of a vertical or above a horizontal slider.

Definition at line 54 of file qwt_slider.h.

Constructor & Destructor Documentation

◆ QwtSlider() [1/2]

QwtSlider::QwtSlider ( QWidget * parent = NULL )

explicit

Construct vertical slider in QwtSlider::Trough style with a scale to the left.

The scale is initialized to [0.0, 100.0] and the value set to 0.0.

Parameters

parent Parent widget

See also: setOrientation(), setScalePosition(), setBackgroundStyle()

Definition at line 119 of file qwt_slider.cpp.

◆ QwtSlider() [2/2]

QwtSlider::QwtSlider	(	Qt::Orientation	orientation,
		QWidget *	parent = NULL )

explicit

Construct a slider in QwtSlider::Trough style

When orientation is Qt::Vertical the scale will be aligned to the left - otherwise at the the top of the slider.

The scale is initialized to [0.0, 100.0] and the value set to 0.0.

Parameters

parent	Parent widget
orientation	Orientation of the slider.

Definition at line 136 of file qwt_slider.cpp.

◆ ~QwtSlider()

QwtSlider::~QwtSlider ( )

virtual

Destructor.

Definition at line 143 of file qwt_slider.cpp.

Member Function Documentation

◆ borderWidth()

int QwtSlider::borderWidth ( ) const

Returns: the border width.

See also: setBorderWidth()

Definition at line 262 of file qwt_slider.cpp.

◆ changeEvent()

void QwtSlider::changeEvent ( QEvent * event )

overrideprotectedvirtual

Handles QEvent::StyleChange and QEvent::FontChange events

Parameters

event Change event

Reimplemented from QwtAbstractScale.

Definition at line 724 of file qwt_slider.cpp.

◆ drawHandle()

void QwtSlider::drawHandle	(	QPainter *	painter,
		const QRect &	handleRect,
		int	pos ) const

protectedvirtual

Draw the thumb at a position

Parameters

painter	Painter
handleRect	Bounding rectangle of the handle
pos	Position of the handle marker in widget coordinates

Definition at line 473 of file qwt_slider.cpp.

◆ drawSlider()

void QwtSlider::drawSlider	(	QPainter *	painter,
		const QRect &	sliderRect ) const

protectedvirtual

Draw the slider into the specified rectangle.

Parameters

painter	Painter
sliderRect	Bounding rectangle of the slider

Definition at line 415 of file qwt_slider.cpp.

◆ event()

bool QwtSlider::event ( QEvent * event )

overrideprotectedvirtual

Qt event handler

Parameters

event Event

Returns: true, if event was recognized and processed

Definition at line 712 of file qwt_slider.cpp.

◆ handleRect()

QRect QwtSlider::handleRect ( ) const

protected

Returns: Bounding rectangle of the slider handle

Definition at line 990 of file qwt_slider.cpp.

◆ handleSize()

QSize QwtSlider::handleSize ( ) const

Returns: Size of the handle.

See also: setHandleSize()

Definition at line 326 of file qwt_slider.cpp.

◆ hasGroove()

bool QwtSlider::hasGroove ( ) const

Returns: True, when the groove is visible

See also: setGroove(), hasTrough()

Definition at line 904 of file qwt_slider.cpp.

◆ hasTrough()

bool QwtSlider::hasTrough ( ) const

Returns: True, when the trough is visible

See also: setTrough(), hasGroove()

Definition at line 875 of file qwt_slider.cpp.

◆ isScrollPosition()

bool QwtSlider::isScrollPosition ( const QPoint & pos ) const

overrideprotectedvirtual

Determine what to do when the user presses a mouse button.

Parameters

pos	Mouse position

Return values

True,when handleRect() contains pos

See also: scrolledTo()

Implements QwtAbstractSlider.

Definition at line 503 of file qwt_slider.cpp.

◆ minimumSizeHint()

QSize QwtSlider::minimumSizeHint ( ) const

overridevirtual

Returns: Minimum size hint

See also: sizeHint()

Definition at line 922 of file qwt_slider.cpp.

◆ mousePressEvent()

void QwtSlider::mousePressEvent ( QMouseEvent * event )

overrideprotectedvirtual

Mouse press event handler

Parameters

event Mouse event

Reimplemented from QwtAbstractSlider.

Definition at line 547 of file qwt_slider.cpp.

◆ mouseReleaseEvent()

void QwtSlider::mouseReleaseEvent ( QMouseEvent * event )

overrideprotectedvirtual

Mouse release event handler

Parameters

event Mouse event

Reimplemented from QwtAbstractSlider.

Definition at line 606 of file qwt_slider.cpp.

◆ orientation()

Qt::Orientation QwtSlider::orientation ( ) const

Returns: Orientation

See also: setOrientation()

Definition at line 202 of file qwt_slider.cpp.

◆ paintEvent()

void QwtSlider::paintEvent ( QPaintEvent * event )

overrideprotectedvirtual

Qt paint event handler

Parameters

event Paint event

Definition at line 675 of file qwt_slider.cpp.

◆ resizeEvent()

void QwtSlider::resizeEvent ( QResizeEvent * event )

overrideprotectedvirtual

Qt resize event handler

Parameters

event Resize event

Definition at line 700 of file qwt_slider.cpp.

◆ scaleChange()

void QwtSlider::scaleChange ( )

overrideprotectedvirtual

Notify changed scale.

Reimplemented from QwtAbstractSlider.

Definition at line 378 of file qwt_slider.cpp.

◆ scaleDraw()

const QwtScaleDraw * QwtSlider::scaleDraw ( ) const

Returns: the scale draw of the slider

See also: setScaleDraw()

Definition at line 363 of file qwt_slider.cpp.

◆ scalePosition()

QwtSlider::ScalePosition QwtSlider::scalePosition ( ) const

Returns: Position of the scale

See also: setScalePosition()

Definition at line 230 of file qwt_slider.cpp.

◆ scrolledTo()

double QwtSlider::scrolledTo ( const QPoint & pos ) const

overrideprotectedvirtual

Determine the value for a new position of the slider handle.

Parameters

pos	Mouse position

Returns: Value for the mouse position

See also: isScrollPosition()

Implements QwtAbstractSlider.

Definition at line 526 of file qwt_slider.cpp.

◆ setBorderWidth()

void QwtSlider::setBorderWidth ( int width )

Change the slider's border width.

The border width is used for drawing the slider handle and the trough.

Parameters

width Border width

See also: borderWidth()

Definition at line 244 of file qwt_slider.cpp.

◆ setGroove()

void QwtSlider::setGroove ( bool on )

En/Disable the groove

The slider can be customized by showing a groove for the handle.

Parameters

on	When true, the groove is visible

See also: hasGroove(), setThrough()

Definition at line 889 of file qwt_slider.cpp.

◆ setHandleSize()

void QwtSlider::setHandleSize ( const QSize & size )

Set the slider's handle size.

When the size is empty the slider handle will be painted with a default size depending on its orientation() and backgroundStyle().

Parameters

size New size

See also: handleSize()

Definition at line 311 of file qwt_slider.cpp.

◆ setOrientation()

void QwtSlider::setOrientation ( Qt::Orientation orientation )

Set the orientation.

Parameters

orientation Allowed values are Qt::Horizontal and Qt::Vertical.

See also: orientation(), scalePosition()

Definition at line 175 of file qwt_slider.cpp.

◆ setScaleDraw()

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()

Definition at line 344 of file qwt_slider.cpp.

◆ setScalePosition()

void QwtSlider::setScalePosition ( ScalePosition scalePosition )

Change the position of the scale.

Parameters

scalePosition Position of the scale.

See also: ScalePosition, scalePosition()

Definition at line 213 of file qwt_slider.cpp.

◆ setSpacing()

void QwtSlider::setSpacing ( int spacing )

Change the spacing between trough and scale.

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

The default setting is 4 pixels.

Parameters

spacing Number of pixels

See also: spacing();

Definition at line 278 of file qwt_slider.cpp.

◆ setTrough()

void QwtSlider::setTrough ( bool on )

En/Disable the trough

The slider can be customized by showing a trough for the handle.

Parameters

on	When true, the groove is visible

See also: hasTrough(), setGroove()

Definition at line 860 of file qwt_slider.cpp.

◆ setUpdateInterval()

void QwtSlider::setUpdateInterval ( int interval )

Specify the update interval for automatic scrolling.

The minimal accepted value is 50 ms.

Parameters

interval Update interval in milliseconds

See also: setUpdateInterval()

Definition at line 395 of file qwt_slider.cpp.

◆ sizeHint()

QSize QwtSlider::sizeHint ( ) const

overridevirtual

Returns: minimumSizeHint()

Definition at line 912 of file qwt_slider.cpp.

◆ sliderRect()

QRect QwtSlider::sliderRect ( ) const

protected

Returns: Bounding rectangle of the slider - without the scale

Definition at line 1014 of file qwt_slider.cpp.

◆ spacing()

int QwtSlider::spacing ( ) const

Returns: Number of pixels between slider and scale

See also: setSpacing()

Definition at line 296 of file qwt_slider.cpp.

◆ timerEvent()

void QwtSlider::timerEvent ( QTimerEvent * event )

overrideprotectedvirtual

Timer event handler

Handles the timer, when the mouse stays pressed inside the sliderRect().

Parameters

event Mouse event

Definition at line 633 of file qwt_slider.cpp.

◆ updateInterval()

int QwtSlider::updateInterval ( ) const

Returns: Update interval in milliseconds for automatic scrolling

See also: setUpdateInterval()

Definition at line 404 of file qwt_slider.cpp.

Public Types

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ ScalePosition

Constructor & Destructor Documentation

◆ QwtSlider() [1/2]

◆ QwtSlider() [2/2]

◆ ~QwtSlider()

Member Function Documentation

◆ borderWidth()

◆ changeEvent()

◆ drawHandle()

◆ drawSlider()

◆ event()

◆ handleRect()

◆ handleSize()

◆ hasGroove()

◆ hasTrough()

◆ isScrollPosition()

◆ minimumSizeHint()

◆ mousePressEvent()

◆ mouseReleaseEvent()

◆ orientation()

◆ paintEvent()

◆ resizeEvent()

◆ scaleChange()

◆ scaleDraw()

◆ scalePosition()

◆ scrolledTo()

◆ setBorderWidth()

◆ setGroove()

◆ setHandleSize()

◆ setOrientation()

◆ setScaleDraw()

◆ setScalePosition()

◆ setSpacing()

◆ setTrough()

◆ setUpdateInterval()

◆ sizeHint()

◆ sliderRect()

◆ spacing()

◆ timerEvent()

◆ updateInterval()