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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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