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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#ifndef QWT_DOUBLE_RANGE_H
#define QWT_DOUBLE_RANGE_H
#include "qwt_global.h"
/*!
\brief A class which controls a value within an interval
This class is useful as a base class or a member for sliders.
It represents an interval of type double within which a value can
be moved. The value can be either an arbitrary point inside
the interval (see QwtDoubleRange::setValue), or it can be fitted
into a step raster (see QwtDoubleRange::fitValue and
QwtDoubleRange::incValue).
As a special case, a QwtDoubleRange can be periodic, which means that
a value outside the interval will be mapped to a value inside the
interval when QwtDoubleRange::setValue(), QwtDoubleRange::fitValue(),
QwtDoubleRange::incValue() or QwtDoubleRange::incPages() are called.
*/
class QWT_EXPORT QwtDoubleRange
{
public:
QwtDoubleRange();
virtual ~QwtDoubleRange();
void setRange( double vmin, double vmax,
double vstep = 0.0, int pagesize = 1 );
void setValid( bool );
bool isValid() const;
virtual void setValue( double );
double value() const;
void setPeriodic( bool tf );
bool periodic() const;
void setStep( double );
double step() const;
double maxValue() const;
double minValue() const;
int pageSize() const;
virtual void incValue( int );
virtual void incPages( int );
virtual void fitValue( double );
protected:
double exactValue() const;
double exactPrevValue() const;
double prevValue() const;
virtual void valueChange();
virtual void stepChange();
virtual void rangeChange();
private:
void setNewValue( double value, bool align = false );
class PrivateData;
PrivateData *d_data;
};
#endif
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