QwtCounter(3)

NAME
QwtCounter -

The Counter Widget.

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
void setEditable (bool)
void setNumButtons (int n)
int numButtons () const
void setIncSteps (QwtCounter::Button btn, int nSteps)
int incSteps (QwtCounter::Button btn) const
virtual void setValue (double)
virtual QSize sizeHint () const
virtual void polish ()
double step () const
void setStep (double s)
double minVal () const
void setMinValue (double m)
double maxVal () const
void setMaxValue (double m)
void setStepButton1 (int nSteps)
int stepButton1 () const
void setStepButton2 (int nSteps)
int stepButton2 () const
void setStepButton3 (int nSteps)
int stepButton3 () const
virtual double value () const

  Protected Member Functions
virtual bool event (QEvent *)
virtual void wheelEvent (QWheelEvent *)
virtual void keyPressEvent (QKeyEvent *)
virtual void rangeChange ()

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

  QwtCounter::~QwtCounter () [virtual]
Destructor.

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::editable () const
returns whether the line edit is edatble. (default is yes)

  bool QwtCounter::event (QEvent * e) [protected, virtual] Handle PolishRequest events

  int QwtCounter::incSteps (QwtCounter::Button btn) 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)

  double QwtCounter::maxVal () const
returns the maximum value of the range

  double QwtCounter::minVal () const
returns the minimum value of the range

  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 (bool editable)
Allow/disallow the user to manually edit the value. Parameters:
    editable true enables editing
See also:
    editable()

  void QwtCounter::setIncSteps (QwtCounter::Button btn, int nSteps) 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 (double value) Set the maximum value of the range
Parameters:
    value Maximum value
See also:
    setMinValue(), maxVal()

  void QwtCounter::setMinValue (double value) Set the minimum value of the range
Parameters:
    value Minimum value
See also:
    setMaxValue(), minVal()

  void QwtCounter::setNumButtons (int n)
Specify the number of buttons on each side of the label. Parameters:
    n Number of buttons

  void QwtCounter::setStep (double stepSize) Set the step size
Parameters:
    stepSize Step size
See also:
    QwtDoubleRange::setStep()
Reimplemented from QwtDoubleRange.

  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::setValue (double v) [virtual]
Set a new value. Parameters:
    v new value Calls QwtDoubleRange::setValue and does all visual updates.
See also:
    QwtDoubleRange::setValue()
Reimplemented from QwtDoubleRange.

  QSize QwtCounter::sizeHint () const [virtual]
A size hint.

  double QwtCounter::step () const
returns the step size
Reimplemented from QwtDoubleRange.

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

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

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

  double QwtCounter::value () const [virtual] Returns:
    Current value
Reimplemented from QwtDoubleRange.

  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 * e) [protected, virtual] Handle wheel events
Parameters:
    e Wheel event

Author
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