| 1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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| 2 | * Qwt Widget Library
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| 3 | * Copyright (C) 1997 Josef Wilgen
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| 4 | * Copyright (C) 2002 Uwe Rathmann
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the Qwt License, Version 1.0
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| 8 | *****************************************************************************/
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| 9 |
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| 10 | #ifndef QWT_DOUBLE_RANGE_H
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| 11 | #define QWT_DOUBLE_RANGE_H
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| 12 |
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| 13 | #include "qwt_global.h"
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| 14 |
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| 15 | /*!
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| 16 | \brief A class which controls a value within an interval
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| 17 |
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| 18 | This class is useful as a base class or a member for sliders.
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| 19 | It represents an interval of type double within which a value can
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| 20 | be moved. The value can be either an arbitrary point inside
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| 21 | the interval (see QwtDoubleRange::setValue), or it can be fitted
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| 22 | into a step raster (see QwtDoubleRange::fitValue and
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| 23 | QwtDoubleRange::incValue).
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| 24 |
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| 25 | As a special case, a QwtDoubleRange can be periodic, which means that
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| 26 | a value outside the interval will be mapped to a value inside the
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| 27 | interval when QwtDoubleRange::setValue(), QwtDoubleRange::fitValue(),
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| 28 | QwtDoubleRange::incValue() or QwtDoubleRange::incPages() are called.
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| 29 | */
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| 30 |
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| 31 | class QWT_EXPORT QwtDoubleRange
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| 32 | {
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| 33 | public:
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| 34 | QwtDoubleRange();
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| 35 | virtual ~QwtDoubleRange();
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| 36 |
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| 37 | void setRange(double vmin, double vmax, double vstep = 0.0,
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| 38 | int pagesize = 1);
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| 39 |
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| 40 | void setValid(bool);
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| 41 | bool isValid() const;
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| 42 |
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| 43 | virtual void setValue(double);
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| 44 | double value() const;
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| 45 |
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| 46 | void setPeriodic(bool tf);
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| 47 | bool periodic() const;
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| 48 |
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| 49 | void setStep(double);
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| 50 | double step() const;
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| 51 |
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| 52 | double maxValue() const;
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| 53 | double minValue() const;
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| 54 |
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| 55 | int pageSize() const;
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| 56 |
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| 57 | virtual void incValue(int);
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| 58 | virtual void incPages(int);
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| 59 | virtual void fitValue(double);
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| 60 |
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| 61 | protected:
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| 62 |
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| 63 | double exactValue() const;
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| 64 | double exactPrevValue() const;
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| 65 | double prevValue() const;
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| 66 |
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| 67 | virtual void valueChange();
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| 68 | virtual void stepChange();
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| 69 | virtual void rangeChange();
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| 70 |
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| 71 | private:
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| 72 | void setNewValue(double x, bool align = false);
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| 73 |
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| 74 | double d_minValue;
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| 75 | double d_maxValue;
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| 76 | double d_step;
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| 77 | int d_pageSize;
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| 78 |
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| 79 | bool d_isValid;
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| 80 | double d_value;
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| 81 | double d_exactValue;
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| 82 | double d_exactPrevValue;
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| 83 | double d_prevValue;
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| 84 |
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| 85 | bool d_periodic;
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| 86 | };
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| 87 |
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| 88 | #endif
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