Provided by: libqwt5-doc_5.2.3-1_all 
NAME
QwtCounter -
SYNOPSIS
#include <qwt_counter.h>
Inherits QwtDoubleRange.
Public Types
enum Button { Button1, Button2, Button3, ButtonCnt }
Signals
void buttonReleased (double value)
void valueChanged (double value)
Public Member Functions
QwtCounter (QWidget *parent=NULL)
virtual ~QwtCounter ()
bool editable () const
int incSteps (QwtCounter::Button btn) const
double maxVal () const
double minVal () const
int numButtons () const
virtual void polish ()
void setEditable (bool)
void setIncSteps (QwtCounter::Button btn, int nSteps)
void setMaxValue (double m)
void setMinValue (double m)
void setNumButtons (int n)
void setStep (double s)
void setStepButton1 (int nSteps)
void setStepButton2 (int nSteps)
void setStepButton3 (int nSteps)
virtual void setValue (double)
virtual QSize sizeHint () const
double step () const
int stepButton1 () const
int stepButton2 () const
int stepButton3 () const
virtual double value () const
Protected Member Functions
virtual bool event (QEvent *)
virtual void keyPressEvent (QKeyEvent *)
virtual void rangeChange ()
virtual void wheelEvent (QWheelEvent *)
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. The range
can be specified using QwtDblRange::setRange(). The counter's value is an integer multiple
of the step size. The number of steps by which a button increments or decrements the value
can be specified using QwtCounter::setIncSteps(). The number of buttons can be changed
with QwtCounter::setNumButtons().
Holding the space bar down with focus on a button is the fastest method to step through
the counter values. When the counter underflows/overflows, the focus is set to the
smallest up/down button and counting is disabled. Counting is re-enabled on a button
release event (mouse or space bar).
Example:
#include '../include/qwt_counter.h>
QwtCounter *cnt;
cnt = new QwtCounter(parent, name);
cnt->setRange(0.0, 100.0, 1.0); // From 0.0 to 100, step 1.0
cnt->setNumButtons(2); // Two buttons each side
cnt->setIncSteps(QwtCounter::Button1, 1); // Button 1 increments 1 step
cnt->setIncSteps(QwtCounter::Button2, 20); // Button 2 increments 20 steps
connect(cnt, SIGNAL(valueChanged(double)), my_class, SLOT(newValue(double)));
Member Enumeration Documentation
enum QwtCounter::Button
Button index
Constructor & Destructor Documentation
QwtCounter::QwtCounter (QWidget *parent = NULL) [explicit]
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 (doublevalue) [signal]
This signal is emitted when a button has been released
Parameters:
value The new value
bool QwtCounter::event (QEvent *e) [protected], [virtual]
Handle PolishRequest events
int QwtCounter::incSteps (QwtCounter::Buttonbtn) const
Returns:
the number of steps by which a specified button increments the value or 0 if the
button is invalid.
Parameters:
btn One of QwtCounter::Button1, QwtCounter::Button2, QwtCounter::Button3
void QwtCounter::keyPressEvent (QKeyEvent *e) [protected], [virtual]
Handle key events
• Ctrl + Qt::Key_Home Step to minValue()
• Ctrl + Qt::Key_End Step to maxValue()
• 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)
int QwtCounter::numButtons () const
Returns:
The number of buttons on each side of the widget.
void QwtCounter::polish () [virtual]
Sets the minimum width for the buttons
void QwtCounter::rangeChange () [protected], [virtual]
Notify change of range. This function updates the enabled property of all buttons
contained in QwtCounter.
Reimplemented from QwtDoubleRange.
void QwtCounter::setEditable (booleditable)
Allow/disallow the user to manually edit the value. Parameters:
editable true enables editing
See also:
editable()
void QwtCounter::setIncSteps (QwtCounter::Buttonbtn, intnSteps)
Specify the number of steps by which the value is incremented or decremented when a
specified button is pushed.
Parameters:
btn One of QwtCounter::Button1, QwtCounter::Button2, QwtCounter::Button3
nSteps Number of steps
void QwtCounter::setMaxValue (doublevalue)
Set the maximum value of the range
Parameters:
value Maximum value
See also:
setMinValue(), maxVal()
void QwtCounter::setMinValue (doublevalue)
Set the minimum value of the range
Parameters:
value Minimum value
See also:
setMaxValue(), minVal()
void QwtCounter::setNumButtons (intn)
Specify the number of buttons on each side of the label. Parameters:
n Number of buttons
void QwtCounter::setStep (doublestepSize)
Set the step size
Parameters:
stepSize Step size
See also:
QwtDoubleRange::setStep()
Reimplemented from QwtDoubleRange.
void QwtCounter::setStepButton1 (intnSteps)
Set the number of increment steps for button 1
Parameters:
nSteps Number of steps
void QwtCounter::setStepButton2 (intnSteps)
Set the number of increment steps for button 2
Parameters:
nSteps Number of steps
void QwtCounter::setStepButton3 (intnSteps)
Set the number of increment steps for button 3
Parameters:
nSteps Number of steps
void QwtCounter::setValue (doublev) [virtual]
Set a new value. Parameters:
v new value Calls QwtDoubleRange::setValue and does all visual updates.
See also:
QwtDoubleRange::setValue()
Reimplemented from QwtDoubleRange.
double QwtCounter::value () const [virtual]
Returns:
Current value
Reimplemented from QwtDoubleRange.
void QwtCounter::valueChanged (doublevalue) [signal]
This signal is emitted when the counter's value has changed
Parameters:
value The new value
void QwtCounter::wheelEvent (QWheelEvent *e) [protected], [virtual]
Handle wheel events
Parameters:
e Wheel event
Author
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