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       QwtCounter -

       The Counter Widget.


       #include <qwt_counter.h>

       Inherits QwtDoubleRange.

   Public Types
       enum Button { Button1, Button2, Button3, ButtonCnt }

       void buttonReleased (double value)
       void valueChanged (double value)

   Public Member Functions
       bool editable () const
       virtual void fitValue (double)
       virtual void incPages (int)
       int incSteps (QwtCounter::Button btn) const
       virtual void incValue (int)
       bool isValid () const
       double maxVal () const
       double maxValue () const
       double minVal () const
       double minValue () const
       int numButtons () const
       int pageSize () const
       bool periodic () const
       virtual void polish ()
       QwtCounter (QWidget *parent=NULL)
       void setEditable (bool)
       void setIncSteps (QwtCounter::Button btn, int nSteps)
       void setMaxValue (double m)
       void setMinValue (double m)
       void setNumButtons (int n)
       void setPeriodic (bool tf)
       void setRange (double vmin, double vmax, double vstep=0.0, int pagesize=1)
       void setStep (double s)
       void setStepButton1 (int nSteps)
       void setStepButton2 (int nSteps)
       void setStepButton3 (int nSteps)
       void setValid (bool)
       virtual void setValue (double)
       virtual QSize sizeHint () const
       double step () const
       int stepButton1 () const
       int stepButton2 () const
       int stepButton3 () const
       virtual double value () const
       virtual ~QwtCounter ()

   Protected Member Functions
       virtual bool event (QEvent *)
       double exactPrevValue () const
       double exactValue () const
       virtual void keyPressEvent (QKeyEvent *)
       double prevValue () const
       virtual void rangeChange ()
       virtual void stepChange ()
       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).


       #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
   QwtCounter::~QwtCounter () [virtual]

Member Function Documentation

   void QwtCounter::buttonReleased (doublevalue) [signal] This signal is emitted when a button
       has been released
           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
   double QwtDoubleRange::exactPrevValue () const [protected, inherited]
       Returns the exact previous value.
   double QwtDoubleRange::exactValue () const [protected, inherited]
       Returns the exact value. The exact value is the value which QwtDoubleRange::value would
       return if the value were not adjusted to the step raster. It differs from the current
       value only if QwtDoubleRange::fitValue or QwtDoubleRange::incValue have been used before.
       This function is intended for internal use in derived classes.
   void QwtDoubleRange::fitValue (doublex) [virtual, inherited]
       Adjust the value to the closest point in the step raster. Parameters:
           x value
           The value is clipped when it lies outside the range. When the range is
           QwtDoubleRange::periodic, it will be mapped to a point in the interval such that
           new value := x + n * (max. value - min. value)
            with an integer number n.
       Reimplemented in QwtAbstractSlider.
   void QwtDoubleRange::incPages (intnPages) [virtual, inherited]
       Increment the value by a specified number of pages. Parameters:
           nPages Number of pages to increment. A negative number decrements the value.
           The Page size is specified in the constructor.
   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.
           btn One of QwtCounter::Button1, QwtCounter::Button2, QwtCounter::Button3
   void QwtDoubleRange::incValue (intnSteps) [virtual, inherited]
       Increment the value by a specified number of steps. Parameters:
           nSteps Number of steps to increment
           As a result of this operation, the new value will always be adjusted to the step
       Reimplemented in QwtAbstractSlider.
   bool QwtDoubleRange::isValid () const [inherited]
       Indicates if the value is valid.
       Reimplemented in QwtAbstractSlider.
   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 QwtDoubleRange::maxValue () const [inherited]
       Returns the value of the second border of the range. maxValue returns the value which has
       been specified as the second parameter in QwtDoubleRange::setRange.
       See also:
   double QwtCounter::minVal () const
       returns the minimum value of the range
   double QwtDoubleRange::minValue () const [inherited]
       Returns the value at the first border of the range. minValue returns the value which has
       been specified as the first parameter in setRange().
       See also:
   int QwtCounter::numButtons () const Returns:
           The number of buttons on each side of the widget.
   int QwtDoubleRange::pageSize () const [inherited]
       Returns the page size in steps.
   bool QwtDoubleRange::periodic () const [inherited]
       Returns true if the range is periodic. See also:
   void QwtCounter::polish () [virtual] Sets the minimum width for the buttons
   double QwtDoubleRange::prevValue () const [protected, inherited]
       Returns the previous value.
   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:
   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.
           btn One of QwtCounter::Button1, QwtCounter::Button2, QwtCounter::Button3
           nSteps Number of steps
   void QwtCounter::setMaxValue (doublevalue) Set the maximum value of the range
           value Maximum value
       See also:
           setMinValue(), maxVal()
   void QwtCounter::setMinValue (doublevalue) Set the minimum value of the range
           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 QwtDoubleRange::setPeriodic (booltf) [inherited]
       Make the range periodic. When the range is periodic, the value will be set to a point
       inside the interval such that
       point = value + n * width .fi
       if the user tries to set a new value which is outside the range. If the range is nonperiodic (the default), values outside the range will be clipped.
           tf true for a periodic range
   void QwtDoubleRange::setRange (doublevmin, doublevmax, doublevstep = 0.0, intpageSize = 1)
       Specify range and step size. Parameters:
           vmin lower boundary of the interval
           vmax higher boundary of the interval
           vstep step width
           pageSize page size in steps
           · A change of the range changes the value if it lies outside the new range. The
             current value will *not* be adjusted to the new step raster.
           · vmax < vmin is allowed.
           · If the step size is left out or set to zero, it will be set to 1/100 of the interval
           · If the step size has an absurd value, it will be corrected to a better one.
   void QwtCounter::setStep (doublestepSize) Set the step size
           stepSize Step size
       See also:
       Reimplemented from QwtDoubleRange.
   void QwtCounter::setStepButton1 (intnSteps) Set the number of increment steps for button 1
           nSteps Number of steps
   void QwtCounter::setStepButton2 (intnSteps) Set the number of increment steps for button 2
           nSteps Number of steps
   void QwtCounter::setStepButton3 (intnSteps) Set the number of increment steps for button 3
           nSteps Number of steps
   void QwtDoubleRange::setValid (boolisValid) [inherited]
       Set the value to be valid/invalid.
       Reimplemented in QwtAbstractSlider.
   void QwtCounter::setValue (doublev) [virtual]
       Set a new value. Parameters:
           v new value Calls QwtDoubleRange::setValue and does all visual updates.
       See also:
       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
   void QwtDoubleRange::stepChange () [protected, virtual, inherited]
       Notify a change of the step size. This virtual function is called whenever the step size
       changes. The default implementation does nothing.
   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
           value The new value
   void QwtCounter::wheelEvent (QWheelEvent *e) [protected, virtual] Handle wheel events
           e Wheel event


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