Provided by: libqwt-doc_6.1.4-2_all 
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
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