/*
 * knuminput.h
 *
 *  Copyright (c) 1997 Patrick Dowler <dowler@morgul.fsh.uvic.ca>
 *  Copyright (c) 2000 Dirk A. Mueller <mueller@kde.org>
 *  Copyright (c) 2002 Marc Mutz <mutz@kde.org>
 *
 *  Requires the Qt widget libraries, available at no cost at
 *  http://www.troll.no/
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 *  Boston, MA 02111-1307, USA.
 */

#ifndef K_NUMINPUT_H
#define K_NUMINPUT_H

#include <qwidget.h>
#include <qspinbox.h>
#include <kdemacros.h>

class QLabel;
class QSlider;
class QLineEdit;
class QLayout;
class QValidator;

class KIntSpinBox;

/* ------------------------------------------------------------------------ */

/**
 * You need to inherit from this class if you want to implement K*NumInput
 * for a different variable type
 *
 */
class KNumInput : public QWidget
{
    Q_OBJECT
    Q_PROPERTY( QString label READ label WRITE setLabel )
public:
    /**
     * Default constructor
     * @param parent If parent is 0, the new widget becomes a top-level window. If parent is another widget, this widget becomes a child window inside parent. The new widget is deleted when its parent is deleted. 
     * @param name The name is sent to the QObject constructor.
     */
    KNumInput(QWidget* parent=0, const char* name=0);

    /**
     * @param below A pointer to another KNumInput.
     * @param parent parent widget
     * @param name name of the widget
     */
    KNumInput(KNumInput* below, QWidget* parent=0, const char* name=0);
    ~KNumInput();

    /**
     * Sets the text and alignment of the main description label.
     *
     * @param label The text of the label.
     *              Use QString::null to remove an existing one.
     *
     * @param a one of @p AlignLeft, @p AlignHCenter, YAlignRight and
     *          @p AlignTop, @p AlignVCenter, @p AlignBottom.
     *          default is @p AlignLeft | @p AlignTop.
     *
     * The vertical alignment flags have special meaning with this
     * widget:
     *
     *     @li @p AlignTop     The label is placed above the edit/slider
     *     @li @p AlignVCenter The label is placed left beside the edit
     *     @li @p AlignBottom  The label is placed below the edit/slider
     *
     */
    virtual void setLabel(const QString & label, int a = AlignLeft | AlignTop);

    /**
     * @return the text of the label.
     */
    QString label() const;

    /**
     * @return if the num input has a slider.
     * @since 3.1
     */
    bool showSlider() const { return m_slider; }

    /**
     * Sets the spacing of tickmarks for the slider.
     *
     * @param minor Minor tickmark separation.
     * @param major Major tickmark separation.
     */
    void setSteps(int minor, int major);

    /**
     * Specifies that this widget may stretch horizontally, but is
     * fixed vertically (like QSpinBox itself).
     */
    QSizePolicy sizePolicy() const;

    /**
     * Returns a size which fits the contents of the control.
     *
     * @return the preferred size necessary to show the control
     */
    virtual QSize sizeHint() const;

protected:
    /**
     * Call this function whenever you change something in the geometry
     * of your KNumInput child.
     *
     */
    void layout(bool deep);

    /**
     * You need to overwrite this method and implement your layout
     * calculations there.
     *
     * See KIntNumInput::doLayout and KDoubleNumInput::doLayout implementation
     * for details.
     *
     */
    virtual void doLayout() = 0;

    KNumInput* m_prev, *m_next;
    int m_colw1, m_colw2;

    QLabel*  m_label;
    QSlider* m_slider;
    QSize    m_sizeSlider, m_sizeLabel;

    int      m_alignment;

private:
    void init();

protected:
    virtual void virtual_hook( int id, void* data );
private:
    class KNumInputPrivate;
    KNumInputPrivate *d;
};

/* ------------------------------------------------------------------------ */

/**
 * KIntNumInput combines a QSpinBox and optionally a QSlider
 * with a label to make an easy to use control for setting some integer
 * parameter. This is especially nice for configuration dialogs,
 * which can have many such combinated controls.
 *
 * The slider is created only when the user specifies a range
 * for the control using the setRange function with the slider
 * parameter set to "true".
 *
 * A special feature of KIntNumInput, designed specifically for
 * the situation when there are several KIntNumInputs in a column,
 * is that you can specify what portion of the control is taken by the
 * QSpinBox (the remaining portion is used by the slider). This makes
 * it very simple to have all the sliders in a column be the same size.
 *
 * It uses KIntValidator validator class. KIntNumInput enforces the
 * value to be in the given range, and can display it in any base
 * between 2 and 36.
 *
 * \image html kintnuminput.png "KDE Int Number Input Spinbox"
 *
 * @short An input widget for integer numbers, consisting of a spinbox and a slider.
 * @version $Id: knuminput.h,v 1.57 2004/03/18 02:50:16 bmeyer Exp $
 */

class KIntNumInput : public KNumInput
{
    Q_OBJECT
    Q_PROPERTY( int value READ value WRITE setValue )
    Q_PROPERTY( int minValue READ minValue WRITE setMinValue )
    Q_PROPERTY( int maxValue READ maxValue WRITE setMaxValue )
    Q_PROPERTY( int referencePoint READ referencePoint WRITE setReferencePoint )
    Q_PROPERTY( QString suffix READ suffix WRITE setSuffix )
    Q_PROPERTY( QString prefix READ prefix WRITE setPrefix )
    Q_PROPERTY( QString specialValueText READ specialValueText WRITE setSpecialValueText )

public:
    /**
     * Constructs an input control for integer values
     * with base 10 and initial value 0.
     */
    KIntNumInput(QWidget *parent=0, const char *name=0);
    /**
     * Constructor
     * It constructs a QSpinBox that allows the input of integer numbers
     * in the range of -INT_MAX to +INT_MAX. To set a descriptive label,
     * use setLabel(). To enforce the value being in a range and optionally to
     * attach a slider to it, use setRange().
     *
     * @param value  initial value for the control
     * @param base   numeric base used for display
     * @param parent parent QWidget
     * @param name   internal name for this widget
     */
    KIntNumInput(int value, QWidget* parent=0, int base = 10, const char *name=0);

    /**
     * Constructor
     *
     * the difference to the one above is the "below" parameter. It tells
     * this instance that it is visually put below some other KNumInput widget.
     * Note that these two KNumInput's need not to have the same parent widget
     * or be in the same layout group.
     * The effect is that it'll adjust it's layout in correspondence
     * with the layout of the other KNumInput's (you can build an arbitrary long
     * chain).
     *
     * @param below  append KIntNumInput to the KNumInput chain
     * @param value  initial value for the control
     * @param base   numeric base used for display
     * @param parent parent QWidget
     * @param name   internal name for this widget
     */
    KIntNumInput(KNumInput* below, int value, QWidget* parent=0, int base = 10, const char *name=0);

    /**
     * Destructor
     *
     *
     */
    virtual ~KIntNumInput();

    /**
     * @return the current value.
     */
    int value() const;

    /**
     * @return the curent value in units of the referencePoint.
     * @since 3.1
     */
    double relativeValue() const;

    /**
     * @return the current reference point
     * @since 3.1
     */
    int referencePoint() const;

    /**
     * @return the suffix displayed behind the value.
     * @see setSuffix()
     */
    QString suffix() const;
    /**
     * @return the prefix displayed in front of the value.
     * @see setPrefix()
     */
    QString prefix() const;
    /**
     * @return the string displayed for a special value.
     * @see setSpecialValueText()
     */
    QString specialValueText() const;

    /**
     * @param min  minimum value
     * @param max  maximum value
     * @param step step size for the QSlider
     * @param slider whether the slider is created or not
     */
    void setRange(int min, int max, int step=1, bool slider=true);
    /**
     * Sets the minimum value.
     */
    void setMinValue(int min);
    /**
     * @return the minimum value.
     */
    int minValue() const;
    /**
     * Sets the maximum value.
     */
    void setMaxValue(int max);
    /**
     * @return the maximum value.
     */
    int maxValue() const;

    /**
     * Sets the special value text. If set, the SpinBox will display
     * this text instead of the numeric value whenever the current
     * value is equal to minVal(). Typically this is used for indicating
     * that the choice has a special (default) meaning.
     */
    void setSpecialValueText(const QString& text);

    virtual void setLabel(const QString & label, int a = AlignLeft | AlignTop);

    /**
     * This method returns the minimum size necessary to display the
     * control. The minimum size is enough to show all the labels
     * in the current font (font change may invalidate the return value).
     *
     * @return the minimum size necessary to show the control
     */
    virtual QSize minimumSizeHint() const;

public slots:
    /**
     * Sets the value of the control.
     */
    void setValue(int);

    /**
     * Sets the value in units of the referencePoint
     * @since 3.1
     */
    void setRelativeValue(double);

    /**
     * Sets the reference point for relativeValue.
     * @since 3.1
     */
    void setReferencePoint(int);

    /**
     * Sets the suffix to @p suffix.
     * Use QString::null to disable this feature.
     * Formatting has to be provided (e.g. a space separator between the
     * prepended @p value and the suffix's text has to be provided
     * as the first character in the suffix).
     *
     * @see QSpinBox::setSuffix(), #setPrefix()
     */
    void setSuffix(const QString &suffix);

    /**
     * Sets the prefix to @p prefix.
     * Use QString::null to disable this feature.
     * Formatting has to be provided (see above).
     *
     * @see QSpinBox::setPrefix(), #setSuffix()
     */
    void setPrefix(const QString &prefix);

    /**
     * sets focus to the edit widget and marks all text in if mark == true
     *
     */
    void setEditFocus( bool mark = true );

signals:
    /**
     * Emitted every time the value changes (by calling setValue() or
     * by user interaction).
     */
    void valueChanged(int);

    /**
     * Emitted whenever valueChanged is. Contains the change
     * relative to the referencePoint.
     * @since 3.1
     */
    void relativeValueChanged(double);

private slots:
    void spinValueChanged(int);
    void slotEmitRelativeValueChanged(int);

protected:
    virtual void doLayout();
    void resizeEvent ( QResizeEvent * );

    KIntSpinBox* m_spin;
    QSize        m_sizeSpin;

private:
    void init(int value, int _base);

protected:
    virtual void virtual_hook( int id, void* data );
private:
    class KIntNumInputPrivate;
    KIntNumInputPrivate *d;
};


/* ------------------------------------------------------------------------ */

class KDoubleLine;

/**
 * KDoubleNumInput combines a QSpinBox and optionally a QSlider
 * with a label to make an easy to use control for setting some float
 * parameter. This is especially nice for configuration dialogs,
 * which can have many such combinated controls.
 *
 * The slider is created only when the user specifies a range
 * for the control using the setRange function with the slider
 * parameter set to "true".
 *
 * A special feature of KDoubleNumInput, designed specifically for
 * the situation when there are several instances in a column,
 * is that you can specify what portion of the control is taken by the
 * QSpinBox (the remaining portion is used by the slider). This makes
 * it very simple to have all the sliders in a column be the same size.
 *
 * It uses the KDoubleValidator validator class. KDoubleNumInput
 * enforces the value to be in the given range, but see the class
 * documentation of KDoubleSpinBox for the tricky
 * interrelationship of precision and values. All of what is said
 * there applies here, too.
 *
 * @see KIntNumInput, KDoubleSpinBox
 * @short An input control for real numbers, consisting of a spinbox and a slider.
 */

class KDoubleNumInput : public KNumInput
{
    Q_OBJECT
    Q_PROPERTY( double value READ value WRITE setValue )
    Q_PROPERTY( double minValue READ minValue WRITE setMinValue )
    Q_PROPERTY( double maxValue READ maxValue WRITE setMaxValue )
    Q_PROPERTY( QString suffix READ suffix WRITE setSuffix )
    Q_PROPERTY( QString prefix READ prefix WRITE setPrefix )
    Q_PROPERTY( QString specialValueText READ specialValueText WRITE setSpecialValueText )
    Q_PROPERTY( int precision READ precision WRITE setPrecision )

public:
    /**
     * Constructs an input control for double values
     * with initial value 0.00.
     */
    KDoubleNumInput(QWidget *parent=0, const char *name=0);

    /**
     * @deprecated (value is rounded to a multiple of 1/100)
     * Constructor
     *
     * @param value  initial value for the control
     * @param parent parent QWidget
     * @param name   internal name for this widget
     */
    KDoubleNumInput(double value, QWidget *parent=0, const char *name=0) KDE_DEPRECATED;

    /**
     * Constructor
     *
     * @param lower lower boundary value
     * @param upper upper boundary value
     * @param value  initial value for the control
     * @param step   step size to use for up/down arrow clicks
     * @param precision number of digits after the decimal point
     * @param parent parent QWidget
     * @param name   internal name for this widget
     * @since 3.1
     */
    KDoubleNumInput(double lower, double upper, double value, double step=0.01,
		    int precision=2, QWidget *parent=0, const char *name=0);

    /**
     * destructor
     */
    virtual ~KDoubleNumInput();

    /**
     * @deprecated (rounds @p value to a multiple of 1/100)
     * Constructor
     *
     * puts it visually below other KNumInput
     *
     * @param  below
     * @param  value  initial value for the control
     * @param  parent parent QWidget
     * @param  name   internal name for this widget
     **/
    KDoubleNumInput(KNumInput* below, double value, QWidget* parent=0, const char* name=0) KDE_DEPRECATED;

    /**
     * Constructor
     *
     * the difference here is the "below" parameter. It tells this
     * instance that it is visually put below some other KNumInput
     * widget.  Note that these two KNumInput's need not to have the
     * same parent widget or be in the same layout group.  The effect
     * is that it'll adjust it's layout in correspondence with the
     * layout of the other KNumInput's (you can build an arbitrary long
     * chain).
     *
     * @param below  append KDoubleNumInput to the KDoubleNumInput chain
     * @param lower lower boundary value
     * @param upper upper boundary value
     * @param value  initial value for the control
     * @param step   step size to use for up/down arrow clicks
     * @param precision number of digits after the decimal point
     * @param parent parent QWidget
     * @param name   internal name for this widget
     * @since 3.1
     */
    KDoubleNumInput(KNumInput* below,
		    double lower, double upper, double value, double step=0.02,
		    int precision=2, QWidget *parent=0, const char *name=0);

    /**
     * @return the current value.
     */
    double value() const;

    /**
     * @return the suffix.
     * @see setSuffix()
     */
    QString suffix() const;

    /**
     * @return the prefix.
     * @see setPrefix()
     */
    QString prefix() const;

    /**
     * @return the precision.
     * @see setPrecision()
     */
    int precision() const;

    /**
     * @return the string displayed for a special value.
     * @see setSpecialValueText()
     */
    QString specialValueText() const { return m_specialvalue; }

     /**
     * @param min  minimum value
     * @param max  maximum value
     * @param step step size for the QSlider
     * @param slider whether the slider is created or not
     */
    void setRange(double min, double max, double step=1, bool slider=true);
    /**
     * Sets the minimum value.
     */
    void setMinValue(double min);
    /**
     * @return the minimum value.
     */
    double minValue() const;
    /**
     * Sets the maximum value.
     */
    void setMaxValue(double max);
    /**
     * @return the maximum value.
     */
    double maxValue() const;

    /**
     * Specifies the number of digits to use.
     */
    void setPrecision(int precision);

    /**
     * @return the reference point for relativeValue calculation
     * @since 3.1
     */
    double referencePoint() const;

    /**
     * @return the current value in units of referencePoint.
     * @since 3.1
     */
    double relativeValue() const;

    /**
     * Sets the special value text. If set, the spin box will display
     * this text instead of the numeric value whenever the current
     * value is equal to minVal(). Typically this is used for indicating
     * that the choice has a special (default) meaning.
     */
    void setSpecialValueText(const QString& text);

    virtual void setLabel(const QString & label, int a = AlignLeft | AlignTop);
    virtual QSize minimumSizeHint() const;
    virtual bool eventFilter(QObject*, QEvent*);

public slots:
    /**
     * Sets the value of the control.
     */
    void setValue(double);

    /**
     * Sets the value in units of referencePoint.
     * @since 3.1
     */
    void setRelativeValue(double);

    /**
     * Sets the reference Point to @p ref. It @p ref == 0, emitting of
     * relativeValueChanged is blocked and relativeValue
     * just returns 0.
     * @since 3.1
     */
    void setReferencePoint(double ref);

    /**
     * Sets the suffix to be displayed to @p suffix. Use QString::null to disable
     * this feature. Note that the suffix is attached to the value without any
     * spacing. So if you prefer to display a space separator, set suffix
     * to something like " cm".
     * @see setSuffix()
     */
    void setSuffix(const QString &suffix);

    /**
     * Sets the prefix to be displayed to @p prefix. Use QString::null to disable
     * this feature. Note that the prefix is attached to the value without any
     * spacing.
     * @see setPrefix()
     */
    void setPrefix(const QString &prefix);

signals:
    /**
     * Emitted every time the value changes (by calling setValue() or
     * by user interaction).
     */
    void valueChanged(double);
    /**
     * This is an overloaded member function, provided for
     * convenience. It essentially behaves like the above function.
     *
     * Contains the value in units of referencePoint.
     * @since 3.1
     */
    void relativeValueChanged(double);

private slots:
    void sliderMoved(int);
    void slotEmitRelativeValueChanged(double);

protected:
    virtual void doLayout();
    void resizeEvent ( QResizeEvent * );

    virtual void resetEditBox();

    // ### no longer used, remove when BIC allowed
    KDoubleLine*   edit;

    bool     m_range;
    double   m_lower, m_upper, m_step;
    // ### end no longer used

    QSize    m_sizeEdit;

    friend class KDoubleLine;
private:
    void init(double value, double lower, double upper,
	      double step, int precision);
    double mapSliderToSpin(int) const;
    void updateLegacyMembers();
    // ### no longer used, remove when BIC allowed:
    QString  m_specialvalue, m_prefix, m_suffix;
    double   m_value;
    short    m_precision;
    // ### end remove when BIC allowed

protected:
    virtual void virtual_hook( int id, void* data );
private:
    class KDoubleNumInputPrivate;
    KDoubleNumInputPrivate *d;
};


/* ------------------------------------------------------------------------ */

/**
 *  A QSpinBox with support for arbitrary base numbers
 *  (e.g. hexadecimal).
 *
 *  The class provides an easy interface to use other
 *  numeric systems than the decimal.
 *
 *  @short A QSpinBox with support for arbitrary base numbers.
 */
class KIntSpinBox : public QSpinBox
{
    Q_OBJECT
    Q_PROPERTY( int base READ base WRITE setBase )

public:

    /**
     *  Constructor.
     *
     *  Constructs a widget with an integer inputline with a little scrollbar
     *  and a slider, with minimal value 0, maximal value 99, step 1, base 10
     *  and initial value 0.
     */
    KIntSpinBox( QWidget *parent=0, const char *name=0);

    /**
     *  Constructor.
     *
     *  Constructs a widget with an integer inputline with a little scrollbar
     *  and a slider.
     *
     *  @param lower  The lowest valid value.
     *  @param upper  The greatest valid value.
     *  @param step   The step size of the scrollbar.
     *  @param value  The actual value.
     *  @param base   The base of the used number system.
     *  @param parent The parent of the widget.
     *  @param name   The Name of the widget.
     */
    KIntSpinBox(int lower, int upper, int step, int value, int base = 10,
                QWidget* parent = 0, const char* name = 0);

    /**
     *  Destructor.
     */
    virtual ~KIntSpinBox();

    /**
     * Sets the base in which the numbers in the spin box are represented.
     */
    void setBase(int base);
    /**
     * @return the base in which numbers in the spin box are represented.
     */
    int base() const;
    /**
     * sets focus and optionally marks all text
     *
     */
    void setEditFocus(bool mark);

protected:

    /**
     *  Overloaded the method in QSpinBox
     *  to make use of the base given in the constructor.
     */
    virtual QString mapValueToText(int);

    /**
     *  Overloaded the method in QSpinBox
     *  to make use of the base given in the constructor.
     */
    virtual int mapTextToValue(bool*);

private:
    int val_base;
protected:
    virtual void virtual_hook( int id, void* data );
private:
    class KIntSpinBoxPrivate;
    KIntSpinBoxPrivate *d;
};


/* --------------------------------------------------------------------------- */

/**
   This class provides a spin box for fractional numbers.

   \b Parameters \n

   There are a number of interdependent parameters whose relation to
   each other you need to understand in order to make successful use
   of the spin box.

   @li precision: The number of decimals after the decimal point.
   @li maxValue/minValue: upper and lower bound of the valid range
   @li lineStep: the size of the step that is taken when the user hits
                 the up or down buttons

   Since we work with fixed-point numbers internally, the maximum
   precision is a function of the valid range and vice versa. More
   precisely, the following relations hold:
   \code
   max( abs(minValue()), abs(maxValue() ) <= INT_MAX/10^precision
   maxPrecision = floor( log10( INT_MAX/max(abs(minValue()),abs(maxValue())) ) )
   \endcode

   Since the value, bounds and step are rounded to the current
   precision, you may experience that the order of setting above
   parameters matters. E.g. the following are @em not equivalent (try
   it!):

   \code
   // sets precision,
   // then min/max value (rounded to precision and clipped to obtainable range if needed)
   // then value and lineStep
   KDoubleSpinBox * spin = new KDoubleSpinBox( 0, 9.999, 0.001, 4.321, 3, this );

   // sets minValue to 0; maxValue to 10.00(!); value to 4.32(!) and only then
   // increases the precision - too late, since e.g. value has already been rounded...
   KDpubleSpinBox * spin = new KDoubleSpinBox( this );
   spin->setMinValue( 0 );
   spin->setMaxValue( 9.999 );
   spin->setValue( 4.321 );
   spin->setPrecision( 3 );
   \endcode

   @short A spin box for fractional numbers.
   @author Marc Mutz <mutz@kde.org>
   @version $Id: knuminput.h,v 1.57 2004/03/18 02:50:16 bmeyer Exp $
   @since 3.1
**/

class KDoubleSpinBox : public QSpinBox {
  Q_OBJECT
  Q_PROPERTY( bool acceptLocalizedNumbers READ acceptLocalizedNumbers WRITE setAcceptLocalizedNumbers )
  Q_OVERRIDE( double maxValue READ maxValue WRITE setMaxValue )
  Q_OVERRIDE( double minValue READ minValue WRITE setMinValue )
  Q_OVERRIDE( double lineStep READ lineStep WRITE setLineStep )
  Q_OVERRIDE( double value READ value WRITE setValue )
  Q_PROPERTY( int precision READ precision WRITE setPrecision )

public:
  /** Constructs a KDoubleSpinBox with parent @p parent and
      default values for range and value (whatever QRangeControl
      uses) and precision (2). */
  KDoubleSpinBox( QWidget * parent=0, const char * name=0 );
  /** Constructs a KDoubleSpinBox with parent @p parent, range
      [@p lower,@p upper], lineStep @p step, precision @p
      precision and initial value @p value. */
  KDoubleSpinBox( double lower, double upper, double step, double value,
		  int precision=2, QWidget * parent=0, const char * name=0 );

  virtual ~KDoubleSpinBox();

  /** @return whether the spinbox uses localized numbers */
  bool acceptLocalizedNumbers() const;
  /** Sets whether to use and accept localized numbers as returned by
 KLocale::formatNumber() */
  virtual void setAcceptLocalizedNumbers( bool accept );

  /** Sets a new range for the spin box values. Note that @p lower, @p
      upper and @p step are rounded to @p precision decimal points
      first. */
  void setRange( double lower, double upper, double step=0.01, int precision=2 );

  /** @return the current number of decimal points displayed. */
  int precision() const;
  /** Equivalent to setPrecsion( @p precision, @p false ); Needed
      since Qt's moc doesn't ignore trailing parameters with default
      args when searching for a property setter method. */
  void setPrecision( int precision );
  /** Sets the number of decimal points to use. Note that there is a
      tradeoff between the precision used and the available range of
      values. See the class docs for more.
      @param precision the new number of decimal points to use

      @param force disables checking of bound violations that can
             arise if you increase the precision so much that the
             minimum and maximum values can't be represented
             anymore. Disabling is useful if you don't want to keep
             the current min and max values anyway. This is what
             e.g. setRange() does.
  **/
  virtual void setPrecision( int precision, bool force );

  /** @return the current value */
  double value() const;
  /** @return the current lower bound */
  double minValue() const;
  /** Sets the lower bound of the range to @p value, subject to the
      contraints that @p value is first rounded to the current
      precision and then clipped to the maximum representable
      interval.
      @see maxValue, minValue, setMaxValue, setRange
  */
  void setMinValue( double value );
  /** @return the current upper bound */
  double maxValue() const;
  /** Sets the upper bound of the range to @p value, subject to the
      contraints that @p value is first rounded to the current
      precision and then clipped to the maximum representable
      interval.
      @see minValue, maxValue, setMinValue, setRange
  */
  void setMaxValue( double value );

  /** @return the current step size */
  double lineStep() const;
  /** Sets the step size for clicking the up/down buttons to @p step,
      subject to the constraints that @p step is first rounded to the
      current precision and then clipped to the meaningful interval
      [1, @p maxValue - @p minValue]. */
  void setLineStep( double step );

  /** Overridden to ignore any setValidator() calls. */
  void setValidator( const QValidator * );

signals:
  /** Emitted whenever QSpinBox::valueChanged( int ) is emitted. */
  void valueChanged( double value );

public slots:
  /** Sets the current value to @p value, cubject to the constraints
      that @p value is frist rounded to the current precision and then
      clipped to the interval [@p minvalue(),@p maxValue()]. */
  virtual void setValue( double value );

protected:
  virtual QString mapValueToText(int);
  virtual int mapTextToValue(bool*);

protected slots:
  void slotValueChanged( int value );

protected:
 virtual void virtual_hook( int id, void* data );
private:
  typedef QSpinBox base;
  void updateValidator();
  int maxPrecision() const;

  class Private;
  Private * d;
};

#endif // K_NUMINPUT_H
