Qwt User's Guide

NAME¶

QwtCounter - The Counter Widget.

SYNOPSIS¶

#include <qwt_counter.h>

Inherits QWidget.

Public Types¶

enum Button { Button1, Button2, Button3, ButtonCnt }
Button index.

Public Slots¶

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

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. bool wrapping () const
bool isReadOnly () const
void setReadOnly (bool)
Allow/disallow the user to manually edit the value. 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. void setRange (double min, double max)
Set the minimum and maximum values. 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¶

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 (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¶

void QwtCounter::buttonReleased (double value) [signal]¶

This signal is emitted when a button has been released

Parameters:

value The new value

bool QwtCounter::event (QEvent * event) [protected], [virtual]¶

Handle QEvent::PolishRequest events

Parameters:

event Event

Returns:

see QWidget::event()

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()

bool QwtCounter::isReadOnly () const¶

Returns:

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

See also:

setReadOnly()

bool QwtCounter::isValid () const¶

Returns:

True, if the value is valid

See also:

setValid(), setValue()

void QwtCounter::keyPressEvent (QKeyEvent * event) [protected], [virtual]¶

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

double QwtCounter::maximum () const¶

Returns:

The maximum of the range

See also:

setRange(), setMaximum(), minimum()

double QwtCounter::minimum () const¶

Returns:

The minimum of the range

See also:

setRange(), setMinimum(), maximum()

int QwtCounter::numButtons () const¶

Returns:

The number of buttons on each side of the widget.

See also:

setNumButtons()

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()

void QwtCounter::setMaximum (double value)¶

Set the maximum value of the range

Parameters:

value Maximum value

See also:

setRange(), setMinimum(), maximum()

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.

void QwtCounter::setNumButtons (int numButtons)¶

Specify the number of buttons on each side of the label

Parameters:

numButtons Number of buttons

See also:

numButtons()

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()

void QwtCounter::setReadOnly (bool on)¶

Allow/disallow the user to manually edit the value.

Parameters:

on True disable editing

See also:

isReadOnly()

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()

void QwtCounter::setStepButton1 (int nSteps)¶

Set the number of increment steps for button 1

Parameters:

nSteps Number of steps

void QwtCounter::setStepButton2 (int nSteps)¶

Set the number of increment steps for button 2

Parameters:

nSteps Number of steps

void QwtCounter::setStepButton3 (int nSteps)¶

Set the number of increment steps for button 3

Parameters:

nSteps Number of steps

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()

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.

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()

double QwtCounter::singleStep () const¶

Returns:

Single step size

See also:

setSingleStep()

double QwtCounter::value () const¶

Returns:

Current value of the counter

See also:

setValue(), valueChanged()

void QwtCounter::valueChanged (double value) [signal]¶

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

Parameters:

value The new value

void QwtCounter::wheelEvent (QWheelEvent * event) [protected], [virtual]¶

Handle wheel events

Parameters:

event Wheel event

bool QwtCounter::wrapping () const¶

Returns:

True, when wrapping is set

See also:

setWrapping()

Author¶

Generated automatically by Doxygen for Qwt User's Guide from the source code.

Wed Jan 2 2019

Version 6.1.4

Source file:	QwtCounter.3.en.gz (from libqwt-doc 6.1.4-2)
Source last updated:	2020-12-16T01:44:12Z
Converted to HTML:	2024-10-21T18:25:47Z