QwtSlider Class Reference

The Slider Widget. More...

#include <qwt_slider.h>

Inheritance diagram for QwtSlider:

List of all members.

Public Types
enum	BGSTYLE {   BgTrough = 0x1,   BgSlot = 0x2,   BgBoth = BgTrough | BgSlot }
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
BGSTYLE	bgStyle () const
int	borderWidth () 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, BGSTYLE bgStyle=BgTrough)
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	setBgStyle (BGSTYLE)
void	setBorderWidth (int bw)
void	setMargins (int x, int y)
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 QwtScaleDiv &s)
void	setScale (const QwtDoubleInterval &, double step=0.0)
void	setScaleDraw (QwtScaleDraw *)
void	setScaleEngine (QwtScaleEngine *)
void	setScaleMaxMajor (int ticks)
void	setScaleMaxMinor (int ticks)
void	setScalePosition (ScalePos s)
void	setStep (double)
void	setThumbLength (int l)
void	setThumbWidth (int w)
void	setTracking (bool enable)
void	setUpdateTime (int t)
void	setValid (bool valid)
virtual QSize	sizeHint () const
double	step () const
void	stopMoving ()
int	thumbLength () const
int	thumbWidth () const
double	value () const
Protected Member Functions
const QwtAbstractScaleDraw *	abstractScaleDraw () const
QwtAbstractScaleDraw *	abstractScaleDraw ()
void	draw (QPainter *p, const QRect &update_rect)
virtual void	drawSlider (QPainter *p, const QRect &r)
virtual void	drawThumb (QPainter *p, const QRect &, int pos)
double	exactPrevValue () const
double	exactValue () const
virtual void	fontChange (const QFont &oldFont)
virtual void	getScrollMode (const QPoint &p, int &scrollMode, int &direction)
virtual double	getValue (const QPoint &p)
virtual void	keyPressEvent (QKeyEvent *e)
void	layoutSlider (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)
double	prevValue () const
virtual void	rangeChange ()
void	rescale (double vmin, double vmax, double step=0.0)
virtual void	resizeEvent (QResizeEvent *e)
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)
virtual void	valueChange ()
virtual void	wheelEvent (QWheelEvent *e)
int	xyPosition (double v) const

---

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 Enumeration Documentation

enum QwtSlider::BGSTYLE

Background style.

See also:

QwtSlider()

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()

enum QwtAbstractSlider::ScrollMode [inherited]

Scroll mode

See also:

getScrollMode()

---

Constructor & Destructor Documentation

QwtSlider::QwtSlider	(	QWidget *	parent,
		Qt::Orientation	orientation = Qt::Horizontal,
		ScalePos	scalePos = NoScale,
		BGSTYLE	bgStyle = BgTrough
	)		[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::BgTrough draws the slider button in a trough, QwtSlider::BgSlot draws a slot underneath the button. An or-combination of both may also be used. The default is QwtSlider::BgTrough.

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::BGSTYLE QwtSlider::bgStyle

(

)

const

Returns:

the background style.

int QwtSlider::borderWidth

(

)

const

Returns:

the border width.

void QwtSlider::draw	(	QPainter *	p,
		const QRect &	update_rect
	)		[protected]

Draw the QwtSlider.

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

Draw the slider into the specified rectangle.

Parameters:

painter	Painter
r	Rectangle

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

Draw the thumb at a position

Parameters:

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

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 QwtDoubleRange::fitValue or QwtDoubleRange::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::fontChange

(

const QFont &

oldFont

)

[protected, virtual]

Notify change in font.

void QwtSlider::getScrollMode	(	const QPoint &	p,
		int &	scrollMode,
		int &	direction
	)		[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.

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 QwtCompass, and QwtDial.

void QwtSlider::layoutSlider

(

bool

update_geometry = true

)

[protected]

Recalculate the slider's geometry and layout based on the current rect and fonts.

Parameters:

update_geometry

notify the layout system and call update to redraw the scale

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()

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()

void QwtAbstractSlider::mouseMoveEvent

(

QMouseEvent *

e

)

[protected, virtual, inherited]

Mouse Move Event handler

Parameters:

e	Mouse event

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 *

e

)

[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.

void QwtAbstractScale::setAbstractScaleDraw

(

QwtAbstractScaleDraw *

scaleDraw

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