The Counter Widget. More...

#include <qwt_counter.h>

Inheritance diagram for QwtCounter:

Public Types
enum	Button { Button1, Button2, Button3, ButtonCnt }
	Button index. More...

Public Slots
void	setValue (double)
	Set a new value without adjusting to the step raster. More...

Signals
void	buttonReleased (double value)

void	valueChanged (double value)

Public Member Functions
	QwtCounter (QWidget *parent=NULL)

virtual	~QwtCounter ()
	Destructor.

void	setValid (bool)

bool	isValid () const

void	setWrapping (bool)
	En/Disable wrapping. More...

bool	wrapping () const

bool	isReadOnly () const

void	setReadOnly (bool)
	Allow/disallow the user to manually edit the value. More...

void	setNumButtons (int)

int	numButtons () const

void	setIncSteps (QwtCounter::Button, int numSteps)

int	incSteps (QwtCounter::Button) const

virtual QSize	sizeHint () const
	A size hint.

double	singleStep () const

void	setSingleStep (double stepSize)
	Set the step size of the counter. More...

void	setRange (double min, double max)
	Set the minimum and maximum values. More...

double	minimum () const

void	setMinimum (double)

double	maximum () const

void	setMaximum (double)

void	setStepButton1 (int nSteps)

int	stepButton1 () const
	returns the number of increment steps for button 1

void	setStepButton2 (int nSteps)

int	stepButton2 () const
	returns the number of increment steps for button 2

void	setStepButton3 (int nSteps)

int	stepButton3 () const
	returns the number of increment steps for button 3

double	value () const

Protected Member Functions
virtual bool	event (QEvent *)

virtual void	wheelEvent (QWheelEvent *)

virtual void	keyPressEvent (QKeyEvent *)

Detailed Description

The Counter Widget.

A Counter consists of a label displaying a number and one ore more (up to three) push buttons on each side of the label which can be used to increment or decrement the counter's value.

A counter has a range from a minimum value to a maximum value and a step size. When the wrapping property is set the counter is circular.

The number of steps by which a button increments or decrements the value can be specified using setIncSteps(). The number of buttons can be changed with setNumButtons().

Example:

#include <qwt_counter.h>
 
QwtCounter *counter = new QwtCounter(parent);
 
counter->setRange(0.0, 100.0);                  // From 0.0 to 100
counter->setSingleStep( 1.0 );                  // Step size 1.0
counter->setNumButtons(2);                      // Two buttons each side
counter->setIncSteps(QwtCounter::Button1, 1);   // Button 1 increments 1 step
counter->setIncSteps(QwtCounter::Button2, 20);  // Button 2 increments 20 steps
 
connect(counter, SIGNAL(valueChanged(double)), myClass, SLOT(newValue(double)));

Member Enumeration Documentation

◆ Button

enum QwtCounter::Button

Button index.

Enumerator
Button1	Button intended for minor steps.
Button2	Button intended for medium steps.
Button3	Button intended for large steps.
ButtonCnt	Number of buttons.

Constructor & Destructor Documentation

◆ QwtCounter()

QwtCounter::QwtCounter ( QWidget * parent = NULL )

explicit

The counter is initialized with a range is set to [0.0, 1.0] with 0.01 as single step size. The value is invalid.

The default number of buttons is set to 2. The default increments are:

Button 1: 1 step
Button 2: 10 steps
Button 3: 100 steps

Parameters

parent

Member Function Documentation

◆ buttonReleased

void QwtCounter::buttonReleased ( double value )

signal

This signal is emitted when a button has been released

Parameters

value The new value

◆ event()

bool QwtCounter::event ( QEvent * event )

protectedvirtual

Handle QEvent::PolishRequest events

Parameters

event Event

Returns: see QWidget::event()

◆ incSteps()

int QwtCounter::incSteps ( QwtCounter::Button button ) const

Returns: The number of steps by which a specified button increments the value or 0 if the button is invalid.

Parameters

button Button index

See also: setIncSteps()

◆ isReadOnly()

bool QwtCounter::isReadOnly ( ) const

Returns: True, when the line line edit is read only. (default is no)

See also: setReadOnly()

◆ isValid()

bool QwtCounter::isValid ( ) const

Returns: True, if the value is valid

See also: setValid(), setValue()

◆ keyPressEvent()

void QwtCounter::keyPressEvent ( QKeyEvent * event )

protectedvirtual

Handle key events

Ctrl + Qt::Key_Home
Step to minimum()
Ctrl + Qt::Key_End
Step to maximum()
Qt::Key_Up
Increment by incSteps(QwtCounter::Button1)
Qt::Key_Down
Decrement by incSteps(QwtCounter::Button1)
Qt::Key_PageUp
Increment by incSteps(QwtCounter::Button2)
Qt::Key_PageDown
Decrement by incSteps(QwtCounter::Button2)
Shift + Qt::Key_PageUp
Increment by incSteps(QwtCounter::Button3)
Shift + Qt::Key_PageDown
Decrement by incSteps(QwtCounter::Button3)

Parameters

event Key event

◆ maximum()

double QwtCounter::maximum ( ) const

Returns: The maximum of the range

See also: setRange(), setMaximum(), minimum()

◆ minimum()

double QwtCounter::minimum ( ) const

Returns: The minimum of the range

See also: setRange(), setMinimum(), maximum()

◆ numButtons()

int QwtCounter::numButtons ( ) const

Returns: The number of buttons on each side of the widget.

See also: setNumButtons()

◆ setIncSteps()

void QwtCounter::setIncSteps	(	QwtCounter::Button	button,
		int	numSteps
	)

Specify the number of steps by which the value is incremented or decremented when a specified button is pushed.

Parameters

button	Button index
numSteps	Number of steps

See also: incSteps()

◆ setMaximum()

void QwtCounter::setMaximum ( double value )

Set the maximum value of the range

Parameters

value Maximum value

See also: setRange(), setMinimum(), maximum()

◆ setMinimum()

void QwtCounter::setMinimum ( double value )

Set the minimum value of the range

Parameters

value Minimum value

See also: setRange(), setMaximum(), minimum()

Note: The maximum is adjusted if necessary to ensure that the range remains valid.

◆ setNumButtons()

void QwtCounter::setNumButtons ( int numButtons )

Specify the number of buttons on each side of the label

Parameters

numButtons Number of buttons

See also: numButtons()

◆ setRange()

void QwtCounter::setRange	(	double	min,
		double	max
	)

Set the minimum and maximum values.

The maximum is adjusted if necessary to ensure that the range remains valid. The value might be modified to be inside of the range.

Parameters

min	Minimum value
max	Maximum value

See also: minimum(), maximum()

◆ setReadOnly()

void QwtCounter::setReadOnly ( bool on )

Allow/disallow the user to manually edit the value.

Parameters

on	True disable editing

See also: isReadOnly()

◆ setSingleStep()

void QwtCounter::setSingleStep ( double stepSize )

Set the step size of the counter.

A value <= 0.0 disables stepping

Parameters

stepSize Single step size

See also: singleStep()

◆ setStepButton1()

void QwtCounter::setStepButton1 ( int nSteps )

Set the number of increment steps for button 1

Parameters

nSteps Number of steps

◆ setStepButton2()

void QwtCounter::setStepButton2 ( int nSteps )

Set the number of increment steps for button 2

Parameters

nSteps Number of steps

◆ setStepButton3()

void QwtCounter::setStepButton3 ( int nSteps )

Set the number of increment steps for button 3

Parameters

nSteps Number of steps

◆ setValid()

void QwtCounter::setValid ( bool on )

Set the counter to be in valid/invalid state

When the counter is set to invalid, no numbers are displayed and the buttons are disabled.

Parameters

on	If true the counter will be set as valid

See also: setValue(), isValid()

◆ setValue

void QwtCounter::setValue ( double value )

slot

Set a new value without adjusting to the step raster.

The state of the counter is set to be valid.

Parameters

value New value

See also: isValid(), value(), valueChanged()

Warning: The value is clipped when it lies outside the range.

◆ setWrapping()

void QwtCounter::setWrapping ( bool on )

En/Disable wrapping.

If wrapping is true stepping up from maximum() value will take you to the minimum() value and vice versa.

Parameters

on	En/Disable wrapping

See also: wrapping()

◆ singleStep()

double QwtCounter::singleStep ( ) const

Returns: Single step size

See also: setSingleStep()

◆ value()

double QwtCounter::value ( ) const

Returns: Current value of the counter

See also: setValue(), valueChanged()

◆ valueChanged

void QwtCounter::valueChanged ( double value )

signal

This signal is emitted when the counter's value has changed

Parameters

value The new value

◆ wheelEvent()

void QwtCounter::wheelEvent ( QWheelEvent * event )

protectedvirtual

Handle wheel events

Parameters

event Wheel event

◆ wrapping()

bool QwtCounter::wrapping ( ) const

Returns: True, when wrapping is set

See also: setWrapping()

Public Types

Public Slots

Signals

Public Member Functions

Protected Member Functions

Detailed Description

Member Enumeration Documentation

◆ Button

Constructor & Destructor Documentation

◆ QwtCounter()

Member Function Documentation

◆ buttonReleased

◆ event()

◆ incSteps()

◆ isReadOnly()

◆ isValid()

◆ keyPressEvent()

◆ maximum()

◆ minimum()

◆ numButtons()

◆ setIncSteps()

◆ setMaximum()

◆ setMinimum()

◆ setNumButtons()

◆ setRange()

◆ setReadOnly()

◆ setSingleStep()

◆ setStepButton1()

◆ setStepButton2()

◆ setStepButton3()

◆ setValid()

◆ setValue

◆ setWrapping()

◆ singleStep()

◆ value()

◆ valueChanged

◆ wheelEvent()

◆ wrapping()